SiENBE28-901
ServiceManual
Air Cooled Refrigeration Condensing Unit
LRLEQ5AY1(E)LRLEQ6AY1(E)LRLEQ8AY1(E)LRLEQ10AY1(E)LRLEQ12AY1(E)LRLEQ15AY1(E)LRLEQ20AY1(E)
LRMEQ5AY1(E)LRMEQ6AY1(E)LRMEQ8AY1(E)LRMEQ10AY1(E)LRMEQ12AY1(E)LRMEQ15AY1(E)LRMEQ20AY1(E)
SiENBE28-901
Air Cooled Refrigeration Condensing Unit 1
Air Cooled RefrigerationCondensing Unit
LRMEQ5AY1, 6AY1, 8AY1, 10AY1, 12AY1, 15AY1, 20AY1LRLEQ5AY1, 6AY1, 8AY1, 10AY1, 12AY1, 15AY1, 20AY1
Air Cooled Refrigeration Condensing Unit 1 1LRMEQ5AY1, 6AY1, 8AY1, 10AY1, 12AY1, 15AY1, 20AY1 1LRLEQ5AY1, 6AY1, 8AY1, 10AY1, 12AY1, 15AY1, 20AY1 11. Introduction .............................................................................................22. Standard Specification ............................................................................7
2.1 Standard Specification .............................................................................72.2 Set Values for Functional Components and Protection Devices............132.3 Operation Limits .....................................................................................142.4 Wiring Diagram.......................................................................................152.5 Piping Diagram.......................................................................................182.6 Description and Layout of Functional Parts and Piping Diagram ...........21
3. Field Settings ........................................................................................303.1 Field Setting From Outdoor Unit.............................................................30
4. Description of Functions and Operation................................................404.1 Operating Mode......................................................................................404.2 Outline of Functions ...............................................................................474.3 Detailed Description of Functions...........................................................48
5. Test Operation ......................................................................................575.1 Refrigerant Piping...................................................................................575.2 Field Wiring ............................................................................................635.3 Inspection and Pipe Insulation ...............................................................665.4 Checks after Work Completion...............................................................695.5 Additional Refrigerant Charge ................................................................695.6 Test Run.................................................................................................71
6. Troubleshooting ....................................................................................736.1 Checking Points at Servicing..................................................................736.2 List of Malfunction Codes .......................................................................766.3 Checking Malfunction Codes by LED Lamps on PCB............................776.4 Checking Malfunction Codes of the Condensing Unit ............................796.5 Troubleshooting by RAM Monitor...........................................................806.6 Flow Chart for Troubleshooting ..............................................................846.7 Maintenance.........................................................................................141
7. Appendix (Supplementary Information)...............................................1497.1 Restriction Matter of Showcase............................................................1497.2 Selection of Expansion Valve...............................................................1497.3 Trouble Case with Present Machine (R-407C).....................................1507.4 Option List ............................................................................................154
Introduction SiENBE28-901
2 Air Cooled Refrigeration Condensing Unit
1. Introduction
Safety PrecautionsBefore performing design, construction, or maintenance, thoroughly read the "SafetyPrecautions" and also the "Installation Manual" and "Operation Manual" that come with thisproduct.
Precautions are classified as " WARNING" or " CAUTION" for the purpose of this Section.Items that mishandling highly potentially induces serious consequences such as death or seriousinjury are specially described under " WARNING". Furthermore, even items described under" CAUTION" potentially induce serious consequences depending on circumstances. All areimportant items for safety and must be followed without fail.
After the completion of construction or repair work, conduct test run on the equipment to check itfor any abnormalities, and also explain precautions for use of the equipment to customer.
Pictograms
This symbol alerts you to precautions to be taken.Sections under this symbol provide the specific descriptions of precautions.This symbol alerts you to prohibited acts.Sections under or in the vicinity of this symbol provide the specific descriptions of prohibited acts.This symbol alerts you to mandatory acts or instructions.Sections under or in the vicinity of this symbol provide the specific descriptions of instructions.
<I. Precautions for Construction and Repair>
WARNING(1) To overhaul the equipment,
be sure to turn OFF all power supplies.
(2) If a refrigerant gas belches during work, do not touch the refrigerant gas.
Not doing so will result in an electric shock.To repair the equipment or check for circuits with power applied, pay utmost attention not to touch any live part.
Doing so will result in frostbite.
(3) To remove a welded part from the suction or discharge pipe of compressor, remove it in a well-ventilated area after thoroughly discharging a refrigerant gas.Not doing so will cause the refrigerant
gas or refrigerant oil to belch, thus resulting in injury.
(4) If a refrigerant gas leaks during work, ventilate the working area.If the refrigerant gas comes into contact with a flame, toxic gas will be generated.
(5) The electrical parts of outdoor unit carry a high voltage.To repair these parts, thoroughly dischargeelectricity from the capacitor.Not doing so will result in an electric shock.
SiENBE28-901 Introduction
Air Cooled Refrigeration Condensing Unit 3
CAUTION(6) Do not start or stop the air
conditioner using the POWER SUPPLY switch.Doing so may result in a failure or water leakage.
(7) Do not repair electrical parts with wet hand.Doing so may result in an electric shock.
(8) Do not wash the air conditioner in water.Doing so may result in an electric shock or a fire.
(9) Be sure to establish a ground for the equipment.Not doing so may result in an electric shock.
(10) To clean the equipment, be sure to set the POWER SUPPLY switch to "OFF" to turn OFF all power supplies.Not doing so may result in injury because the internal fan rotates at high speeds.
(11) To dismount the equipment, pay careful attention not to tilt it.Tilting the equipment may cause water remaining in the equipment to fall in drops, thus wetting goods kept in storage.
(12) Check whether or not the refrigerating cycle part gets hot, and then repair the equipment.Not doing so may result in a burn.
(13) Use a welder in well-ventilated areas.Using the welder in an enclosed room may result in lack of oxygen.
<II. Precautions for Equipment after Construction and Repair>
WARNING(14) To repair the equipment, be
sure to use parts listed in the List of Service Parts for the applicable model and proper tools. Furthermore, NEVER make any modification to the equipment.
(15) To install or relocate an air conditioner, select a location capable of supporting the weight of the air conditioner.The insufficient strength of the location or improper installation of the air conditioner will cause the unit to drop, thus resulting in injury.Not observing this warning will result
in an electric shock, heat generation, or a fire.
The insufficient strength of the location or improper installation of the air conditioner will cause the unit to drop, thus resulting in injury.Not observing this warning will result
in an electric shock, heat generation, or a fire.
Introduction SiENBE28-901
4 Air Cooled Refrigeration Condensing Unit
WARNING(16) Conduct electrical works
according to information in the "Electrical Equipment Technical Standards", "Internal Wiring Regulations", and Installation Manual, and further be sure to use dedicated circuits. Insufficient capacity of the power supply circuit and faulty electrical works will result in an electric shock or a fire.
(19) Do not cause damage to or process the power supply cord.Doing so will result in an electric shock or a fire.Putting heavy things on, heating, or pulling the power supply cord will result in damage to it.
(17) To make wirings between indoor and outdoor units, use specified wires to securely connect them, and fix them so that the external force of cables will not be transmitted to terminal connections.Imperfect connections or fixing will result in heat generation or a fire.
(18) To make wirings between indoor and outdoor units or for power supply, form wires so that structures such as the service lid will not be lifted, and properly mount the lid.Improperly mounting the lid will result in heat generation of the terminal part, an electric shock, or a fire.
Doing so will result in an electric shock or a fire.Putting heavy things on, heating, or pulling the power supply cord will result in damage to it.
(20) Do not cause anything other than the specified refrigerant (e.g. air) to get mixed in the refrigerant system.Doing so will cause the refrigerant system to have abnormally high internal pressure, thus resulting in damage to the equipment or bodily injury.
Doing so will cause the refrigerant system to have abnormally high internal pressure, thus resulting in damage to the equipment or bodily injury.
(21) Should the equipment have leakage of refrigerant gas, locate leaking points, and then repair them without fail. Subsequently, refill the equipment with a specified quantity of refrigerant.If no leaking points are located and thereby repair work is to be discontinued, perform pump-down operation, and then close the service valve. Not doing so will result in refrigerant gas leakage.The refrigerant gas itself is harmless, but if it comes into contact with a flame from a fan heater, stove, or stove burner, toxic gas will be generated.
CAUTION(22) A ground leakage circuit
breaker needs to be mounted.
Mounting no ground leakage circuit breaker may result in an electric shock or a fire.
(23) Do not install the equipment in places with the potential for leakage of flammable gas.Should a flammable gas leak to accumulate around the equipment, the gas may catch fire.
SiENBE28-901 Introduction
Air Cooled Refrigeration Condensing Unit 5
<III. Precautions after Construction and Repair>
WARNING(24) Check power supply terminals
for deposition of dust or for any loose terminals.
Deposition of dust on or imperfect connections of the terminals will result in an electric shock or a fire.
(26) Do not connect the power supply cord halfway or with many loads of other electrical fittings on one electric outlet.
Doing so will result in an electric shock, heat generation, or a fire.
(25) Be sure to replace flawed or deteriorated power supply cord or lead wires.
Not doing so will result in an electric shock, heat generation, or a fire.
CAUTION(27) Check to be sure that the
mounting positions and wiring conditions of parts as well as the connections of soldered parts and crimpstyle terminals are all normal.
(30) After the completion of repair, be sure to make measurement of insulation resistance to prove that it is not less than 1MΩ.Insulation failures may result in an electric shock.
If any of these items is abnormal, an electric shock, heat generation, or a fire may result.
(28) If the installation base or mounting frames are reduced in strength due to corrosion, replace them.
Not doing so may cause the equipment to drop, thus resulting in injury.
(29) Check for the grounding state. If the ground is in an imperfect state, rectify it.
Imperfect ground may result in an electric shock.
(31) After the completion of repair, be sure to check the indoor unit for drainage.
Insufficient draining from the indoor unit may result in the entry of water into a room, thus wetting furniture and household goods.
Introduction SiENBE28-901
6 Air Cooled Refrigeration Condensing Unit
Air Cooled Refrigeration Condensing Unit
Nomenclature
Outdoor unitLR M E Q 5 A Y1
Power supply symbolY1: 3φ 380-415V, 50Hz
Indicates major design category
Capacity indication5: 5HP
RefrigerantQ: R-410A
Compressor typeE: Intermediate INJ type
Temperature zone to be usedM: Medium temperature (MT)L: Low temperature (LT)
Product categoryL: Low temperature air conditionerR: Outdoor unit
SiENBE28-901 Standard Specification
Air Cooled Refrigeration Condensing Unit 7
2. Standard Specification2.1 Standard Specification
Notes:H1 [ ] shows the anti-corrosion treatment type.H2 Rated conditions of the refrigeration equipment :
Saturated temperature equivalent to suction pressure: -10°COutdoor air: 32°C, Suction SH: 10°C
H3 Measurement place: Front: 1m, Height: 1.5m4 The minimum connection load with inside unit: 2.0kW
Model 1 LRMEQ5AY1[LRMEQ5AY1E]
LRMEQ6AY1[LRMEQ6AY1E]
Power Supply 3 phase 50Hz 380-415VCapacity 2 kW 12.2 14.4Range of Suction Pressure EquivalentSaturation Temperature °C -20~+10
Range of Outdoor Temperature °C -15~+43Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)]Dimensions: (H×W×D) mm 1680×635×765Heat Exchanger Cross fin coil
Compressor
Type Hermetically sealed scroll typePiston Displacement m3/h 10.04 13.85Number of Revolutions r.p.m 4740 6540Motor Output × Number of Units kW 2.3 3.2Starting Method Direct-on-line (Inverter system)
Fan
Type Propeller fanMotor Output kW 0.35×1Air Flow Rate m3/min 95 102Drive Direct drive
Connecting Pipes
Liquid Pipe φ9.5 C1220T (Brazing connection)Gas Pipe φ19.1 C1220T (Brazing connection)
Receiver Volume 5.4Mass kg 175
Safety Devices High Pressure Switch, Fan Driver Overload Protector, Overcurrent Relay,Inverter Overload Protector, Fusible Plug
Capacity Control % 33~100 24~100
RefrigerantRefrigerant Name R410ACharge Volume kg 5.2
Refrigerant Oil
Refrigerant Oil Name DAPHNE FVC68DCharge Volume L 1.7+2.5
Operating Sound 3 dBA 54 56Standard Accessories Installation Manual, Operation Manual, Connection Pipes, Clamps
Standard Specification SiENBE28-901
8 Air Cooled Refrigeration Condensing Unit
Notes:H1 [ ] shows the anti-corrosion treatment type.H2 Rated conditions of the refrigeration equipment :
Saturated temperature equivalent to suction pressure: -10°COutdoor air: 32°C, Suction SH: 10°C
H3 Measurement place: Front: 1m, Height: 1.5m4 The minimum connection load with inside unit: 2.0kW
Model 1 LRMEQ8AY1[LRMEQ8AY1E]
LRMEQ10AY1[LRMEQ10AY1E]
LRMEQ12AY1[LRMEQ12AY1E]
Power Supply 3 phase 50Hz 380-415VCapacity 2 kW 18.6 21.8 24.4Range of Suction Pressure EquivalentSaturation Temperature °C -20~+10
Range of Outdoor Temperature °C -15~+43Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)]Dimensions: (H×W×D) mm 1680×930×765Heat Exchanger Cross fin coil
Compressor
Type Hermetically sealed scroll typePiston Displacement m3/h 19.68 23.36 25.27Number of Revolutions r.p.m 4320, 2900 6060, 2900 6960, 2900Motor Output × Number of Units kW 2.1+3.6 3.0+3.6 3.4+3.6Starting Method Direct-on-line (Inverter system)
Fan
Type Propeller fanMotor Output kW 0.75×1Air Flow Rate m3/min 171 179 191Drive Direct drive
Connecting Pipes
Liquid Pipe φ9.5 C1220T (Brazing connection)Gas Pipe φ25.4 C1220T (Brazing connection)
Receiver Volume 8.1Mass kg 255
Safety Devices High Pressure Switch, Fan Driver Overload Protector, Overcurrent Relay,Inverter Overload Protector, Fusible Plug
Capacity Control % 17~100 14~100 13~100
RefrigerantRefrigerant Name R410ACharge Volume kg 7.9
Refrigerant Oil
Refrigerant Oil Name DAPHNE FVC68DCharge Volume L 1.7+2.1+3.0
Operating Sound 3 dBA 57 59 61Standard Accessories Installation Manual, Operation Manual, Connection Pipes, Clamps
SiENBE28-901 Standard Specification
Air Cooled Refrigeration Condensing Unit 9
Notes:H1 [ ] shows the anti-corrosion treatment type.H2 Rated conditions of the refrigeration equipment :
Saturated temperature equivalent to suction pressure: -10°COutdoor air: 32°C, Suction SH: 10°C
H3 Measurement place: Front: 1m, Height: 1.5m4 The minimum connection load with inside unit: 2.0kW
Model 1 LRMEQ15AY1[LRMEQ15AY1E]
LRMEQ20AY1[LRMEQ20AY1E]
Power Supply 3 phase 50Hz 380-415VCapacity 2 kW 32.2 37.0Range of Suction Pressure EquivalentSaturation Temperature °C -20~+10
Range of Outdoor Temperature °C -15~+43Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)]Dimensions: (H×W×D) mm 1680×1240×765Heat Exchanger Cross fin coil
Compressor
Type Hermetically sealed scroll typePiston Displacement m3/h 30.00 35.80Number of Revolutions r.p.m 5640, 2900 6960, 2900Motor Output × Number of Units kW 2.8+3.6+3.6 3.4+3.6+3.6Starting Method Direct-on-line (Inverter system)
Fan
Type Propeller fanMotor Output kW 0.75×2Air Flow Rate m3/min 230 240Drive Direct drive
Connecting Pipes
Liquid Pipe φ12.7 C1220T (Brazing connection)Gas Pipe φ31.8 C1220T (Brazing connection)
Receiver Volume 12.1Mass kg 355
Safety Devices High Pressure Switch, Fan Driver Overload Protector, Overcurrent Relay,Inverter Overload Protector, Fusible Plug
Capacity Control % 10~100 9~100
RefrigerantRefrigerant Name R410ACharge Volume kg 11.5
Refrigerant Oil
Refrigerant Oil Name DAPHNE FVC68DCharge Volume L 1.7+2.1+2.1+4.0
Operating Sound 3 dBA 62 63Standard Accessories Installation Manual, Operation Manual, Connection Pipes, Clamps
Standard Specification SiENBE28-901
10 Air Cooled Refrigeration Condensing Unit
Notes:H1 [ ] shows the anti-corrosion treatment type.H2 Rated conditions of the refrigeration equipment :
Saturated temperature equivalent to suction pressure: -35°COutdoor air: 32°C, Suction SH: 10°C
H3 Measurement place: Front: 1m, Height: 1.5m4 The minimum connection load with inside unit: 1.6kW
Model 1 LRLEQ5AY1[LRLEQ5AY1E]
LRLEQ6AY1[LRLEQ6AY1E]
Power Supply 3 phase 50Hz 380-415VCapacity 2 kW 5.4 6.3Range of Suction Pressure EquivalentSaturation Temperature °C -45~-20
Range of Outdoor Temperature °C -15~+43Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)]Dimensions: (H×W×D) mm 1680×635×765Heat Exchanger Cross fin coil
Compressor
Type Hermetically sealed scroll typePiston Displacement m3/h 10.04 13.85Number of Revolutions r.p.m 4740 6540Motor Output × Number of Units kW 2.3 3.2Starting Method Direct-on-line (Inverter system)
Fan
Type Propeller fanMotor Output kW 0.35×1Air Flow Rate m3/min 95 102Drive Direct drive
Connecting Pipes
Liquid Pipe φ9.5 C1220T (Brazing connection)Gas Pipe φ19.1 C1220T (Brazing connection)
Receiver Volume 5.4Mass kg 175
Safety Devices High Pressure Switch, Fan Driver Overload Protector, Overcurrent Relay,Inverter Overload Protector, Fusible Plug
Capacity Control % 33~100 24~100
RefrigerantRefrigerant Name R410ACharge Volume kg 5.2
Refrigerant Oil
Refrigerant Oil Name DAPHNE FVC68DCharge Volume L 1.7+2.5
Operating Sound 3 dBA 54 56Standard Accessories Installation Manual, Operation Manual, Connection Pipes, Clamps
SiENBE28-901 Standard Specification
Air Cooled Refrigeration Condensing Unit 11
Notes:H1 [ ] shows the anti-corrosion treatment type.H2 Rated conditions of the refrigeration equipment :
Saturated temperature equivalent to suction pressure: -35°COutdoor air: 32°C, Suction SH: 10°C
H3 Measurement place: Front: 1m, Height: 1.5m4 The minimum connection load with inside unit: 1.6kW
Model 1 LRLEQ8AY1[LRLEQ8AY1E]
LRLEQ10AY1[LRLEQ10AY1E]
LRLEQ12AY1[LRLEQ12AY1E]
Power Supply 3 phase 50Hz 380-415VCapacity 2 kW 8.0 9.4 10.3Range of Suction Pressure EquivalentSaturation Temperature °C -45~-20
Range of Outdoor Temperature °C -15~+43Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)]Dimensions: (H×W×D) mm 1680×930×765Heat Exchanger Cross fin coil
Compressor
Type Hermetically sealed scroll typePiston Displacement m3/h 19.68 23.36 25.27Number of Revolutions r.p.m 4320, 2900 6060, 2900 6960, 2900Motor Output × Number of Units kW 2.1+3.6 3.0+3.6 3.4+3.6Starting Method Direct-on-line (Inverter system)
Fan
Type Propeller fanMotor Output kW 0.75×1Air Flow Rate m3/min 171 179 191Drive Direct drive
Connecting Pipes
Liquid Pipe φ9.5 C1220T (Brazing connection)Gas Pipe φ25.4 C1220T (Brazing connection)
Receiver Volume 8.1Mass kg 255
Safety Devices High Pressure Switch, Fan Driver Overload Protector, Overcurrent Relay,Inverter Overload Protector, Fusible Plug
Capacity Control % 17~100 14~100 13~100
RefrigerantRefrigerant Name R410ACharge Volume kg 7.9
Refrigerant Oil
Refrigerant Oil Name DAPHNE FVC68DCharge Volume L 1.7+2.1+3.0
Operating Sound 3 dBA 57 59 61Standard Accessories Installation Manual, Operation Manual, Connection Pipes, Clamps
Standard Specification SiENBE28-901
12 Air Cooled Refrigeration Condensing Unit
Notes:H1 [ ] shows the anti-corrosion treatment type.H2 Rated conditions of the refrigeration equipment :
Saturated temperature equivalent to suction pressure: -35°COutdoor air: 32°C, Suction SH: 10°C
H3 Measurement place: Front: 1m, Height: 1.5m4 The minimum connection load with inside unit: 1.6kW
Model 1 LRLEQ15AY1[LRLEQ15AY1E]
LRLEQ20AY1[LRLEQ20AY1E]
Power Supply 3 phase 50Hz 380-415VCapacity 2 kW 13.6 15.1Range of Suction Pressure EquivalentSaturation Temperature °C -45~-20
Range of Outdoor Temperature °C -15~+43Casing Color Ivory white (5Y7.5/1) [Light camel (2.5Y6.5/1.5)]Dimensions: (H×W×D) mm 1680×1240×765Heat Exchanger Cross fin coil
Compressor
Type Hermetically sealed scroll typePiston Displacement m3/h 30.00 35.80Number of Revolutions r.p.m 5640, 2900 6960, 2900Motor Output × Number of Units kW 2.8+3.6+3.6 3.4+3.6+3.6Starting Method Direct-on-line (Inverter system)
Fan
Type Propeller fanMotor Output kW 0.75×2Air Flow Rate m3/min 230 240Drive Direct drive
Connecting Pipes
Liquid Pipe φ12.7 C1220T (Brazing connection)Gas Pipe φ31.8 C1220T (Brazing connection)
Receiver Volume 12.1Mass kg 355
Safety Devices High Pressure Switch, Fan Driver Overload Protector, Overcurrent Relay,Inverter Overload Protector, Fusible Plug
Capacity Control % 10~100 9~100
RefrigerantRefrigerant Name R410ACharge Volume kg 11.5
Refrigerant Oil
Refrigerant Oil Name DAPHNE FVC68DCharge Volume L 1.7+2.1+2.1+4.0
Operating Sound 3 dBA 62 63Standard Accessories Installation Manual, Operation Manual, Connection Pipes, Clamps
SiENBE28-901 Standard Specification
Air Cooled Refrigeration Condensing Unit 13
2.2 Set Values for Functional Components and Protection Devices
Component Electric symbol LRMEQ5AY1,6AY1LRLEQ5AY1,6AY1
LRMEQ8AY1,10AY1,12AY1LRLEQ8AY1,10AY1,12AY1
LRMEQ15AY1,20AY1LRLEQ15AY1,20AY1
Compressor
InverterType
M1CJT1GFDKTNYR@SB
Overcurrent protection device 14.7A
STD1Type
M2C— JT17GFKTNYE@SB
Overcurrent protection device — 13A
STD2Type
M3C— — JT17GFKTNYE@SB
Overcurrent protection device — — 13A
Fan motor
OutputM1F
350W 750WOvercurrent protection device 1.5A 3.0AOutput
M2F— — 750W
Overcurrent protection device — — 3.0A
PCB
Main PCB A1P Standard:EB09058PCB for compressor INV A3P Standard:PC0509-2
PCB for fan INVA4P PC0511-3(A) PC0511-1(A)A8P — — PC0511-2(A)
PCB for operation input A5P EB0568(A)PCB for noise filter A2P FN354-H-1(A)
PCB for current sensorA6P — EB0292(C)A7P — — EB0292(C)
PCB for earth leakage detection A9P EC0726(A)-9 EC0729(A)-29
Electronic expansion valve
CoilY1E
(Main)
UKV-A023 UKV-A023 UKV-A024DC12V, 0.26A DC12V, 0.26A DC12V, 0.26A
BodyUKV-32D49
0~480pls
CoilY2E
(Gas)
UKV-A023 UKV-A023 UKV-A024DC12V, 0.26A DC12V, 0.26A DC12V, 0.26A
BodyUKV-18D20
0~480pls
CoilY3E
(M1C)
— UKV-A023 UKV-A024— DC12V, 0.26A DC12V, 0.26A
Body— UKV-32D49— 0~480pls
Four way valveCoil
Y3SSTF-G01AQ531A1 STF-G01AQ532A1 STF-G01AQ537A1
Body STF-0404G STF-0713G STF2011G
Solenoid valve
Coil Y2S(M2C)
— NEV-MOAJ562D1 NEV-MOAJ562D1Body — VPV-603D VPV-603DCoil Y5S
(M3C)— — NEV-MOAJ562C1
Body — — VPV-603D
Pressure protection device
High pressure switch
TypeS1PH
ACB-1TB29W ACB-1TB28W ACB-1TB27WSet value OFF 3.8 MPa ON 2.85±0.15MPaType
S2PH— ACB-1TB27W ACB-1TB27W
Set value — OFF 3.8 MPa ON 2.85±0.15MPaType
S3PH— — ACB-1TB27W
Set value — — OFF 3.8 MPaON 2.85±0.15MPa
TypeS4PH
ACB-JB285Set value DC5V ON: 2.96 MPa OFF: 2.16±0.15MPa
Low pressure sensor S1NPL 150NH4-L2 200NH4-L2 200NH4-L2High pressure sensor S1NPH 150NH4-H4 150NH4-H4 200NH4-H4Fusible plug — Open: 70~75°C
Thermistor
Outdoor air thermistor R1T ST8603Suction pipe thermistor R2T ST0602Outdoor heat exchanger outlet thermistor R3T ST8602A
Subcooling heat exchanger outlet thermistor R5T ST0601
Subcooling heat exchanger inlet thermistor R6T ST0601
Discharge pipe thermistorR31T ST0901R32T — ST0901R33T — — ST0901
Fuse (A1P) F1U, F2U 250VAC 3.15A, Class TFuse F3U, F4U 250VAC 1.0A, Class TOperation switch S1S AR22PR-311B Z9
+0 -0.1
+0 -0.1
+0 -0.1
+0 -0.1
Standard Specification SiENBE28-901
14 Air Cooled Refrigeration Condensing Unit
2.3 Operation LimitsLRLEQ5, 6, 8, 10, 12, 15, 20AY1(E)
LRMEQ5, 6, 8, 10, 12, 15, 20AY1(E)
NOTES∗1. “Range for continuous operation” SHOWS POSSIBLE RANGE OF CONTINUOUS OPERATION.∗2. “Range for pull down operation” SHOWS POSSIBLE RANGE OF SHORT-TIME OPERATION.
Out
door
tem
pera
ture
(°C
DB
)
43
Ran
ge fo
r con
tinuo
us o
pera
tion
Ran
ge fo
r pul
l dow
n op
erat
ion
Evaporating temperature (°C)4D064913
40
35
30
25
20
15
10
5
-10
-5
0
-15-45 -40 -35 -30 -25 -20 -15 5 10 30 35 40
• DO NOT SELECT THE MODEL IN THE RANGE FOR PULL DOWN OPERATION.• TO BE MORE THAN 3°C/HOUR THAT THE TEMPERATURE OF INDOOR UNIT DROPS.
DO NOT OPEN THE DOOR AND DO NOT ENTER THE GOODS IN PULL DOWN OPERATION AS MUCH AS.
Out
door
tem
pera
ture
(°C
DB)
Ran
ge fo
r con
tinuo
us o
pera
tion
Ran
ge fo
r pul
l dow
n op
erat
ion
4340
35
30
25
20
15
10
5
-10
-5
0
-15-20 -15 5 10 30 35 400-10 -5
Evaporating temperature (°C)4D064914
SiENBE28-901 Standard Specification
Air Cooled Refrigeration Condensing Unit 15
2.4 Wiring DiagramLRLEQ5A, 6AY1(E)LRMEQ5A, 6AY1(E)
1. T
HIS
WIR
ING
DIA
GR
AM
IS A
PP
LIE
D
ON
LY T
O T
HE
OU
TDO
OR
UN
IT.
2.
: FIE
LD W
IRIN
G.
3.
: TE
RM
INAL
STR
IP
: C
ON
NE
CTO
R
: T
ER
MIN
AL
: P
RO
TEC
TIVE
EA
RTH
(SC
RE
W)
4. A
T TH
E T
IME
OF
FAC
TOR
Y S
HIP
ME
NT,
SE
TTIN
G O
F "O
FF".
WH
EN
OP
ER
ATI
NG
, SE
TTIN
G O
F "O
N" O
R "R
EM
OTE
". TH
E P
OIN
T O
F C
ON
TAC
T O
F TH
E IN
PU
T M
US
T U
SE
TH
E O
NE
FO
R A
SLI
GH
T C
UR
RE
NT.
(F
OR
TH
E R
EM
OTE
SW
ITC
H, U
SE
NO
N-V
OLT
AG
E C
ON
TAC
T FO
R M
ICR
OC
UR
RE
NT
(NO
T M
OR
E T
HA
N 1
mA
DC
12V
))5.
BE
NO
TED
TH
AT
THE
CA
PA
CIT
Y O
F C
ON
TAC
T IS
AC
220~
240V
, 0.5
A. (
TOTA
L O
F C
AU
TIO
N O
UTP
UT,
WA
RN
ING
OU
TPU
T)6.
BE
NO
TED
TH
AT
THE
CA
PA
CIT
Y O
F C
ON
TAC
T IS
AC
220~
240V
, 0.5
A. (
OP
ER
ATI
NG
OU
TPU
T)7.
HO
W T
O U
SE
BS
1~5
AN
D D
S1
AN
D D
S2
SW
ITC
H, R
EFE
R T
O "S
ER
VIC
E P
RE
CA
UTI
ON
" LA
BE
L O
N E
L. C
OM
PO
. BO
X C
OV
ER
.8.
WH
EN
OP
ER
ATI
NG
, DO
N'T
SH
OR
TCIR
CU
IT T
HE
PR
OTE
CTI
ON
DEV
ICE
(S1P
H).
9. C
OLO
RS
BLK
: BLA
CK
RE
D: R
ED
BLU
: BLU
E W
HT:
WH
ITE
GR
N: G
RE
EN
.10
. RY
1 P
OIN
T C
ON
TAC
T IS
OP
EN
BE
FOR
E T
UR
NIN
G O
N P
OW
ER
SU
PP
LY.
RE
FER
TO
TE
CH
NIC
AL
GU
IDE
FO
R T
HE
OP
ER
ATI
ON
TIM
ING
DIA
GR
AM
.
L1L2
L3N
L1L2
L3N
X1M
RED
WHT
BLK
BLU
A9P
X3A
X1A
RY
1
X2A
NO
TE)1
0
PO
WE
R S
UPP
LYY
1: 3
80-4
15V
3N
~50H
z
Z1C
N=1
GR
NC
1
A2P
REDX4
00A
GRN
WHT
BLU
BLK
Z1F
T2A
N
=1
Z10C
N
=4
K4M
F400
U
K3R
X40
1AX
403A
X40
2A
BLK
WHT
RED
A3P
X10
AX
1AX
61A
Z2C
N
=1K
2M V2R
P1
K1R R
95
WH
TL1
R WH
TP
2
C66
C63
R50
R59
V1R
X11
A
Z3C
N
=5
RED
WHT
BLK
UV
W
MS
3~ M1C
X28
A
X20
A
X6A
X4A
Z4C
N
=1
PS
N3
P3
BLK
RE
D
A4P X
5A
X3A
X5A
X41
A
X11
1A
t°R
1T
P1
F1U
N1 R10
X4A
V1R
X2A
5
X2A
5M
S
3~ M1F
RED
WHTBLK
Z5C
N
=1 X1AX
1A
A1P X
1AR
ED
BLU
BLK
F1U
F2U
Q1R
P
P<
S1P
H
X2A
X3A
X4A
V1C
P
X7A
X9A
X10
AX
14A
K3R
K5R
K6R
K10R
Y3S
F4U
F3U
CC
1W
1P
1P
2X
2M
CAU
TIO
N
OU
TPU
T N
OTE
)5
WAR
NIN
GO
UTP
UT
NO
TE)5
OP
ERAT
ING
O
UTP
UT
NO
TE)6
X66
A
A5P
X1M
AB
C
S1S
X1A
RE
MO
TEO
FFO
N4
32
1
X3M 1 2
NO
TE)4
SWIT
CH
t°
R31
T
t°t°
t°t°
R2T
R3T
R5T
R6T
X29
AX
30A
PS
H1P
H2P
H3P
H4P
H5P
H6P
H7P
H8P
BS
1B
S2
BS
3B
S4
BS
5H
AP
DS
1O
N
OFF
12
34
DS
2O
N
OFF
12
34
IS C
ONN
ECTO
R CO
LOR
FOR
PRIN
TED
CIRC
UIT
BOAR
D.
IS C
ONN
ECTO
R CO
LOR
FOR
COM
PON
ENT.
IS D
ISCR
IMIN
ATIO
N CO
LOR
FOR
CO
MPO
NENT
LEA
D W
IER.
X36
A
X18
A
X31
A
X32
A
X21
A
BLK
X22
A
P<
S4P
H
t°R
1T
S1NP
L
S1NP
H 5Y
1E M
WHT
BLK
5Y
2E M
TER
MIN
AL
OF
M1C
U
VW
LAY
OU
T O
F M
1C, M
1F
CO
NTR
OL,
BO
X
M1C
M1F
OU
TER
SH
ELL
CO
NTR
OL,
BO
X
A1P
S1S
X2M
A9P
X1A
X2A
X1M
A5P
X3M
(FR
ON
T)
A3P
A2P
L1R
A4P
(BA
CK
)
NO
TES
)
A1P
PR
INTE
D C
IRC
UIT
BO
AR
D (M
AIN
)K
3RM
AG
NE
TIC
RE
LAY
(CA
UTI
ON
OU
TPU
T)S
1NP
LP
RE
SS
UR
E S
EN
SO
R (L
OW
)
A2P
PR
INTE
D C
IRC
UIT
BO
AR
D (N
OIS
E F
ILTE
R)
K5R
MA
GN
ETI
C R
ELA
Y (Y
3S)
S1P
HP
RE
SS
UR
E S
WIT
CH
(HIG
H)
A3P
PR
INTE
D C
IRC
UIT
BO
AR
D (I
NV
)K
6RM
AG
NE
TIC
RE
LAY
(WA
RN
ING
OU
TPU
T)S
1SO
PE
RA
TIO
N S
WIT
CH
(RE
MO
TE /
OFF
/ O
N)
A4P
PR
INTE
D C
IRC
UIT
BO
AR
D (F
AN
)K
10R
MA
GN
ETI
C R
ELA
Y (O
PE
RA
TIN
G O
UTP
UT)
S4P
HP
RE
SS
UR
E S
WIT
CH
(HIG
H)
A5P
PR
INTE
D C
IRC
UIT
BO
AR
D (A
BC
I / P
)L1
RR
EA
CTO
R (A
3P)
T2A
CU
RR
EN
T S
EN
SO
R (A
9P)
A9P
PRIN
TED
CIRC
UIT B
OARD
(EAR
TH LE
AKAG
E DE
TECT
OR)
M1C
MO
TOR
(CO
MP
RE
SS
OR
)V
1CP
SA
FETY
DE
VIC
ES
INP
UT
BS
1~5
PU
SH
BU
TTO
N S
WIT
CH
(MO
DE
, SE
T, R
ETU
RN
, TE
ST,
RE
SE
T)M
1FM
OTO
R (F
AN
)V
1RP
OW
ER
MO
DU
LE (A
3P, A
4P)
PS
SWIT
CH
ING
PO
WER
SU
PPLY
(A1P
, A3P
)V
2RD
IOD
E B
RID
GE
(A3P
)
C1
CA
PA
CIT
OR
Q1R
PP
HA
SE
RE
VE
RS
AL
DE
TEC
T C
IRC
UIT
X1A
, X2A
CO
NN
EC
TOR
(M1F
)
C63
, C66
CA
PA
CIT
OR
(A3P
)R
10R
ES
ISTO
R (C
UR
RE
NT
SE
NS
OR
) (A
4P)
X1M
TER
MIN
AL
STR
IP (P
OW
ER
SU
PP
LY)
DS
1, D
S2
DIP
SW
ITC
H (A
1P)
R50
, R59
RE
SIS
TOR
(A3P
)X
1MTE
RM
INA
L S
TRIP
(OP
ER
ATI
ON
) (A
5P)
F1U
FUS
E (8
A, D
C65
0V) (
A4P
)R
95R
ES
ISTO
R (C
UR
RE
NT
LIM
ITIN
G)
X2M
TER
MIN
AL
STR
IP
F1U
, F2U
FUS
E (T
, 3.1
5A, 2
50V
) (A
1P)
R1T
THE
RM
ISTO
R (A
IR) (
A1P
)X
3MTE
RM
INA
L S
TRIP
(RE
MO
TE S
WIT
CH
)
F3U
, F4U
FUS
E (T
, 1.0
A, 2
50V
)R
1TTH
ER
MIS
TOR
(FIN
) (A
3P)
Y1E
ELE
CTR
ON
IC E
XP
AN
SIO
N V
ALV
E (M
AIN
)
F400
UFU
SE
(T, 6
.3A
, 250
V) (
A2P
)R
2TTH
ER
MIS
TOR
(SU
CTI
ON
)Y
2EE
LEC
TRO
NIC
EX
PA
NS
ION
VA
LVE
(GA
S)
H1P
~8P
PILO
TLAM
P (S
ERVI
CE M
ONI
TOR-
ORA
NGE)
[H2P
] MAL
FUNC
TIO
N DE
TECT
ION
--- L
IGHT
UP
R31
TTH
ER
MIS
TOR
(M1C
DIS
CH
AR
GE
)Y
3SS
OLE
NO
ID V
ALV
E (4
WA
Y V
ALV
E)
R3T
THE
RM
ISTO
R (H
EA
T E
XC
, DE
ICE
R)
Z1C~
5C, Z
10C
NO
ISE
FIL
TER
(FE
RR
ITE
CO
RE
)
R5T
THER
MIS
TOR
(HEA
T EX
, OF
SUBC
OOL
OUT
LET)
Z1F
NOIS
E FI
LTER
(WIT
H SU
RGE
ABSO
RBER
) (A2
P)
HA
PP
ILO
TLA
MP
(SE
RV
ICE
MO
NIT
OR
-GR
EE
N)
R6T
THER
MIS
TOR
(HEA
T EX
, OF
SUBC
OOL
INLE
T)
K1R
, K3R
MA
GN
ETI
C R
ELA
YR
Y1
MA
GN
ETI
C R
ELA
Y (A
9P)
K2M
, K4M
MA
GN
ETI
C C
ON
TAC
TOR
(M1C
)S
1NP
HP
RE
SS
UR
E S
EN
SO
R (H
IGH
)
3D05
9917
C
Standard Specification SiENBE28-901
16 Air Cooled Refrigeration Condensing Unit
LRLEQ8A, 10A, 12AY1(E)LRMEQ8A, 10A, 12AY1(E)
POW
ER
SU
PPLY
Y1:
380
-415
V 3
N~5
0Hz
Z1C
N=1
GR
NC
1
A2P
RED
X40
0A
GRN
WHT
BLU
BLK
Z1F
Z10C
N
=4
K4M
F400
U
X40
1AX
403A
X40
2A
BLK
WHT
RED
A3P
X10
AX
1AX
61A
Z2C
N
=1K
2M V2R
P1
K1R
R95
WH
TL1
R WH
TP
2
C66
C63
R50
R59
V1R X11
A
Z3C
N
=5
RED
WHT
BLK
UV
W
MS
3~ M1C
X28
A
X20
A
X6A
X4A
Z4C
N
=1
PS
N3 P3
BLK
RE
D
A4P X
5A
X3A
X5A
X41
A
X11
1A
t°
R1T
P1 F1U
N1 R10
X4A
V1R
X2A
5
X2A
5M
S
3~ M1F
REDWHT
BLK
Z5C
N
=1
X1AX1A
A1P X1A
RE
D
BLU
BLK
F1U
F2U
Q1R
P
P<
S1PH
X2A
X3A
X4A
V1C
P
X7A
X9A
X10
AX
14A
K3R
K5R
K6R
K10R
Y3S
F4U
F3U C
C1
W1
P1
P2
X2M
CA
UTI
ON
O
UTP
UT
NO
TE)5
WA
RN
ING
O
UTP
UT
NO
TE)5
OP
ERAT
ING
O
UTP
UT
NO
TE)6
X66
A
A5P
X1M
AB
C
S1S
X1A
RE
MO
TEO
FFO
N4
32
1
X3M 1 2
NO
TE)4
SW
ITC
H
t°
R31
T
t°t°
t°t°
R2T
R3T
R5T
R6T
X29
AX
30A
PS
H1P
H2P
H3P
H4P
H5P
H6P
H7P
H8P
BS
1B
S2
BS
3B
S4
BS
5H
AP
DS
1O
N
OFF
12
34
DS
2O
N
OFF
12
34
IS C
ONN
ECTO
R CO
LOR
FO
R PR
INTE
D C
IRC
UIT
IS C
ONN
ECTO
R CO
LOR
FO
R CO
MPO
NENT
.IS
DIS
CRIM
INAT
ION
COLO
R FO
R
COM
PONE
NT L
EAD
WIR
E.
X36
A
X18
A
X31
A
X32
A
X21
A
BLK
X22
A
P<
S4P
H
t°R
1T
S1NP
L
S1NP
H 5Y
1E M
WHT
BLK
5Y
2E M
TER
MIN
AL
OF
M1C
, M2C
U
VW
LAY
OU
T O
F M
1C, M
2C,
M1F
CO
NTR
OL,
BO
X
M1C
M1F
OU
TER
SH
ELL
CO
NTR
OL.
BO
X
A1P
S1S
X2M
A9P
X1A
X2A
X1M
A5P
X3M
(FR
ON
T)
A3P A2P
L1R
A4P
(BA
CK
)
A1P
PR
INTE
D C
IRC
UIT
BO
AR
D (M
AIN
)K
1RM
AG
NE
TIC
RE
LAY
(K2M
)S
1NP
LP
RE
SS
UR
E S
EN
SO
R (L
OW
)
A2P
PR
INTE
D C
IRC
UIT
BO
AR
D (N
OIS
E F
ILTE
R)
K3R
MA
GN
ETI
C R
ELA
Y (C
AU
TIO
N O
UTP
UT)
S1P
H, S
2PH
PR
ES
SU
RE
SW
ITC
H (H
IGH
)
A3P
PR
INTE
D C
IRC
UIT
BO
AR
D (I
NV
)K
4RM
AG
NE
TIC
RE
LAY
(Y2S
)S
1SO
PE
RA
TIO
N S
WIT
CH
(RE
MO
TE/O
FF/O
N)
A4P
PR
INTE
D C
IRC
UIT
BO
AR
D (F
AN
)K
5RM
AG
NE
TIC
RE
LAY
(Y3S
)S
4PH
PR
ES
SU
RE
SW
ITC
H (H
IGH
)
A5P
PR
INTE
D C
IRC
UIT
BO
AR
D (A
BC
I/P
)K
6RM
AG
NE
TIC
RE
LAY
(WA
RN
ING
OU
TPU
T)T1
AC
UR
RE
NT
SE
NS
OR
(A6P
)
A6P
PRIN
TED
CIR
CUIT
BO
ARD
(CUR
RENT
SEN
SOR
)K
10R
MA
GN
ETI
C R
ELA
Y (O
PE
RA
TIN
G O
UTP
UT)
T2A
CU
RR
EN
T S
EN
SO
R (A
9P)
A9P
PRIN
TED
CIRC
UIT
BOAR
D (E
ARTH
LEAK
AGE
DETE
CTOR
)L1
RR
EA
CTO
R (A
3P)
V1C
PS
AFE
TY D
EV
ICE
S IN
PU
T
BS
1~5
PU
SH
BU
TTO
N S
WIT
CH
(M
OD
E, S
ET, R
ETU
RN
, TES
T, R
ESE
T)M
1C, M
2CM
OTO
R (C
OM
PR
ES
SO
R)
V1R
PO
WE
R M
OD
ULE
(A3P
, A4P
)
M1F
MO
TOR
(FAN
)V
2RD
IOD
E B
RID
GE
(A3P
)
C1
CA
PA
CIT
OR
PS
SW
ITC
HIN
G P
OW
ER
SU
PP
LY (A
1P, A
3P)
X1A
, X2A
CO
NN
EC
TOR
(M1F
)
C63
, C66
CA
PA
CIT
OR
(A3P
)Q
1RP
PH
AS
E R
EV
ER
SA
L D
ETE
CT
CIR
CU
ITX
1MTE
RM
INA
L S
TRIP
(PO
WE
R S
UP
PLY
)
DS
1, D
S2
DIP
SW
ITC
H (A
1P)
R10
RE
SIS
TOR
(CU
RR
EN
T S
EN
SO
R) (
A4P
, A5P
)X
1MTE
RM
INA
L S
TRIP
(OP
ER
ATI
ON
) (A
5P)
F1U
FUS
E (8
A, D
C65
0V) (
A4P
)R
50, R
59R
ES
ISTO
R (A
3P)
X2M
TER
MIN
AL
STR
IP
F1U
, F2U
FUS
E (T
, 3.1
5A, 2
50V
) (A
1P)
R95
RE
SIS
TOR
(CU
RR
EN
T LI
MIT
ING
)X
3MTE
RM
INA
L S
TRIP
(RE
MO
TE S
WIT
CH
)
F3U
, F4U
FUS
E (T
, 1.0
A, 2
50V
)R
1TTH
ER
MS
ITO
R (A
IR) (
A1P
)Y
1EE
LEC
TRO
NIC
EX
PA
NS
ION
VA
LVE
(MA
IN)
F400
UFU
SE
(T, 6
.3A
, 250
V) (
A2P
)R
1TTH
ER
MS
ITO
R (F
IN) (
A3P
)Y
2EE
LEC
TRO
NIC
EX
PA
NS
ION
VA
LVE
(GA
S)
H1P
~8P
PIL
OTL
AM
P (S
ER
VIC
E M
ON
ITO
R-O
RA
NG
E)
[H2]
MA
LFU
NC
TIO
N D
ETE
CTI
ON
---L
IGH
T U
PR
2TTH
ER
MS
ITO
R (S
UC
TIO
N)
Y3E
ELE
CTR
ON
IC E
XP
AN
SIO
N V
ALV
E (M
1C)
R31
T, R
32T
THE
RM
SIT
OR
(M1C
, M2C
DIS
CH
AR
GE
)Y
2SS
OLE
NO
ID V
ALV
E (M
2C)
R3T
THE
RM
SIT
OR
(HE
AT
EX
C, D
EIC
ER
)Y
3SS
OLE
NO
ID V
ALV
E (4
WA
Y V
ALV
E)
HA
PP
ILO
TLA
MP
(SE
RV
ICE
MO
NIT
OR
-GR
EE
N)
R5T
THER
MSI
TOR
(HEA
T EX
, OF
SUBC
OO
L O
UTLE
T)Z1
C~7
C, Z
10C
NO
ISE
FIL
TER
(FE
RR
ITE
CO
RE
)
K1R
, K3R
MA
GN
ETI
C R
ELA
YR
6TTH
ERM
SITO
R (H
EAT
EX, O
F SU
BCO
OL
INLE
T)Z1
FNO
ISE
FILT
ER (W
ITH
SUR
GE
ABSO
RBE
R) (A
2P)
K2M
, K4M
MA
GN
ETI
C C
ON
TAC
TOR
(M1C
)R
Y1
MA
GN
ETI
C R
ELA
Y (A
9P)
K2M
MA
GN
ETI
C C
ON
TAC
TOR
(M2C
)S
1NP
HP
RE
SS
UR
E S
EN
SO
R (H
IGH
)
3D05
9918
C
M2C
A6P
K2M
BLU
WHT
Y3E M
5
BLU
X23
A
R32
T
t°
X8A
K4R
Y2S
P<
S2PH
K1R
X5A
RE
DW
HT
K2M
A1 A2
X26
A
M 3~ M2C
Z7C
N
=5
RED
WHT
BLK
UV
W
K2M
UV
W
RS
T
A6P
T1A
X1A
K3R
T2A
N=1
Z6C
N=1
RE
D
WH
T
BLK
BLU
X1M L1 L2 L3 N
L1 L2 L3 N
A9P
X3A
X1A
RY
1
X2A
NO
TE) 1
0
NO
TES
)1.
TH
IS W
IRIN
G D
IAG
RA
M IS
AP
PLI
ED
ON
LY
TO T
HE
OU
TDO
OR
UN
IT.
2.
: F
IELD
WIR
ING
.3.
:
TE
RM
INA
L S
TRIP
:
CO
NN
EC
TOR
:
TE
RM
INA
L
:
PR
OTE
CTI
VE
EA
RTH
(SC
RE
W)
4. A
T TH
E T
IME
OF
FAC
TOR
Y S
HIP
ME
NT,
SE
TTIN
G O
F "O
FF".
WH
EN O
PE
RAT
ING
, SE
TTIN
G O
F "O
N" O
R "R
EM
OTE
". TH
E
PO
INT
OF
CO
NTA
CT
OF
THE
INP
UT
MU
ST
US
E T
HE
ON
E F
OR
A S
LIG
HT
CU
RR
EN
T. (F
OR
TH
E R
EM
OTE
SW
ITC
H, U
SE
N
ON
-VO
LTA
GE
CO
NTA
CT
FOR
MIC
RO
CU
RR
EN
T (N
OT
MO
RE
TH
AN
1m
A D
C12
V))
5. B
E N
OTE
D T
HA
T TH
E C
AP
AC
ITY
OF
CO
NTA
CT
IS A
C22
0~24
0V, 0
.5A
. (TO
TAL
OF
CA
UTI
ON
OU
TPU
T, W
AR
NIN
G O
UTP
UT)
6. B
E N
OTE
D T
HA
T TH
E C
AP
AC
ITY
OF
CO
NTA
CT
IS A
C22
0~24
0V, 0
.5A
. (O
PE
RA
TIN
G O
UTP
UT)
7. H
OW
TO
US
E B
S1~
5 A
ND
DS
1 A
ND
DS
2 S
WIT
CH
, RE
FER
TO
"SE
RV
ICE
PR
EC
AU
TIO
N" L
AB
EL
ON
EL.
CO
MP
O. B
OX
CO
VE
R.
8. W
HE
N O
PE
RA
TIN
G, D
ON
'T S
HO
RTC
IRC
UIT
TH
E P
RO
TEC
TIO
N D
EV
ICE
(S1P
H, S
2PH
).9.
CO
LOR
S B
LK:B
LAC
K R
ED
:RE
D B
LU:B
LUE
WH
T:W
HIT
E C
RN
:GR
EE
N.
10. R
Y1
PO
INT
CO
NTA
CT
IS O
PE
N B
EFO
RE
TU
RN
ING
ON
PO
WE
R S
UP
PLY
.R
EFE
R T
O T
EC
HN
ICA
L G
UID
E F
OR
TH
E O
PE
RA
TIO
N T
IMIN
G D
IAG
RA
M.
SiENBE28-901 Standard Specification
Air Cooled Refrigeration Condensing Unit 17
LRLEQ15A, 20AY1(E)LRMEQ15A, 20AY1(E)
PO
WE
R S
UPP
LYY
1: 3
80-4
15V
3N
~50H
zG
RN
C1
A2P
RED
X40
0A
GRN
WHT
BLU
BLK
Z1FZ1
0C
N=4
K4M
F400
U
X40
1AX
403A
X40
2A
BLK
WHT
RED
A3P
X10
AX
1AX
61A
Z2C
N
=1K
2M V2R
P1
K1R R95
WH
T
L1R WH
TP
2C
66C
63
R50
R59
V1R X11
A
Z3C
N
=5
RED
WHT
BLK
UV
W
MS
3~ M1C
X28
A
X20
A
X6A
X4A
Z4C
N
=1
PS
N3
P3
BLK
RE
D
A4P X5A
X3A
X5A
X41
A
X11
1A
t°
R1T
P1
F1UN
1
R10
X4A
V1R
X2A
5
X2A
5M
S
3~ M1F
REDWHT
BLK
Z5C
N
=1 X1AX1A
A1P X
1A
RE
D
BLU
BLK
F1U
F2U
Q1R
P
P<
S1PH
X2A
X3A
X4A
V1C
P
X7A
X9A
X10
AX
14A
K3R
K5R
K6R
K10R
Y3S
F4U
F3U
CC
1W
1P
1P
2X
2M
CAU
TIO
N
OU
TPU
T N
OTE
)5
WAR
NIN
GO
UTP
UT
NO
TE)5
OPE
RAT
ING
O
UTP
UT
NO
TE)6
X66
A
A5P
X1M
AB
C
S1S
X1A
RE
MO
TEO
FFO
N
4
32
1
X3M 1 2
NO
TE)4
SW
ITC
H
t°
R31
T
t°t°
t°t°
R2T
R3T
R5T
R6T
X29
AX
30A
PS
H1P
H2P
H3P
H4P
H5P
H6P
H7P
H8P
BS
1B
S2
BS
3B
S4
BS
5H
AP
DS
1O
N
OFF
12
34
DS
2O
N
OFF
12
34
IS C
ON
NECT
OR
CO
LOR
FOR
PRIN
TED
CI
RCUI
T BO
ARD.
IS C
ON
NECT
OR
CO
LOR
FOR
COM
PONE
NT.
IS D
ISC
RIM
INAT
ION
COLO
R FO
R CO
MPO
NENT
LEA
D W
IRE.
X36
A
X18
A
X31
A
X32
A
X21
A BLK
X22
A
P<
S4P
H
t°R
1T
S1NP
L
S1NP
H 5Y
1E M
WHT
BLK
5Y
2E MTER
MIN
AL
OF
M1C
~M3C
U
VW
LAYO
UT O
F M
1C~M
3C, M
1F, M
2F
CO
NTR
OL,
BO
X
M1C
M1F
OU
TER
SH
ELL
CO
NTR
OL.
BO
X
A1P
S1S
X2M
A9P
X1A
X2A X
1MA5
P
X3M
(FR
ON
T)
A3P A2P
L1R
A4P
(BA
CK
)
A1P
PR
INTE
D C
IRC
UIT
BO
AR
D (M
AIN
)K
3RM
AG
NE
TIC
RE
LAY
(CA
UTI
ON
OU
TPU
T)S
1PH
~3P
HP
RE
SS
UR
E S
WIT
CH
(HIG
H)
A2P
PRIN
TED
CIR
CU
IT B
OAR
D (N
OIS
E FI
LTER
)K
4RM
AG
NE
TIC
RE
LAY
(Y2S
)S
4PH
PR
ES
SU
RE
SW
ITC
H (H
IGH
)
A3P
PR
INTE
D C
IRC
UIT
BO
AR
D (I
NV
)K
5RM
AG
NE
TIC
RE
LAY
(Y3S
)S
1SO
PE
RA
TIO
N S
WIT
CH
(RE
MO
TE/O
FF/O
N)
A4P
, A8P
PR
INTE
D C
IRC
UIT
BO
AR
D (F
AN
)K
6RM
AG
NE
TIC
RE
LAY
(WA
RN
ING
OU
TPU
T)T1
AC
UR
RE
NT
SE
NS
OR
(A6P
, A7P
)
A5P
PR
INTE
D C
IRC
UIT
BO
AR
D (A
BC
I/P
)K
10R
MAG
NET
IC R
ELAY
(OPE
RAT
ING
OU
TPU
T)T2
AC
UR
RE
NT
SE
NS
OR
(A9P
)
A6P
, A7P
PRIN
TED
CIRC
UIT
BOAR
D (C
URRE
NT S
ENSO
R)K
11R
MA
GN
ETI
C R
ELA
Y (Y
5S)
V1C
PS
AFE
TY D
EV
ICE
S IN
PU
T
A9P
PRIN
TED
CIRC
UIT B
OARD
(EAR
TH LE
AKAG
E DE
TECT
OR)
L1R
RE
AC
TOR
(A3P
)V
1RP
OW
ER
MO
DU
LE (A
3P, A
4P, A
8P)
BS
1~5
PU
SH
BU
TTO
N S
WIT
CH
(M
OD
E, S
ET,
RE
TUR
N, T
ES
T, R
ES
ET)
M1C
~3C
MO
TOR
(CO
MP
RE
SS
OR
)V
2RD
IOD
E B
RID
GE
(A3P
)
M1F
, M2F
MO
TOR
(FA
N)
X1A
~4A
CO
NN
EC
TOR
(M1F
, M2F
)
C1
CA
PA
CIT
OR
PS
SW
ITC
HIN
G P
OW
ER
SU
PP
LY (A
1P, A
3P)
X10
5AC
ON
NE
CTO
R (S
3PH
)
C63
, C66
CA
PA
CIT
OR
(A3P
)Q
1RP
PH
AS
E R
EV
ER
SA
L D
ETE
CT
CIR
CU
ITX
1MTE
RM
INA
L S
TRIP
(PO
WE
R S
UP
PLY
)
DS
1, D
S2
DIP
SW
ITC
H (A
1P)
R10
RES
ISTO
R (C
UR
REN
T SE
NSO
R) (
A4P,
A8P
)X
1MTE
RM
INA
L S
TRIP
(OP
ER
ATI
ON
) (A
5P)
F1U
FUS
E (8
A, D
C65
0V) (
A4P
, A8P
)R
50, R
59R
ES
ISTO
R (A
3P)
X2M
TER
MIN
AL
STR
IP
F1U
, F2U
FUS
E (T
, 3.1
5A, 2
50V
) (A
1P)
R95
RE
SIS
TOR
(CU
RR
EN
T LI
MIT
ING
)X
3MTE
RM
INA
L S
TRIP
(RE
MO
TE S
WIT
CH
)
F3U
, F4U
FUS
E (T
, 1.0
A, 2
50V
)R
1TTH
ER
MIS
TOR
(AIR
) (A
1P)
Y1E
ELE
CTR
ON
IC E
XP
AN
SIO
N V
ALV
E (M
AIN
)
F400
UFU
SE
(T, 6
.3A
, 250
V) (
A2P
)R
1TTH
ER
MIS
TOR
(FIN
) (A
3P)
Y2E
ELE
CTR
ON
IC E
XP
AN
SIO
N V
ALV
E (G
AS
)
H1P
~8P
PILO
TLAM
P (S
ERVI
CE
MO
NIT
OR
-OR
ANG
E)[H
2P] M
ALFU
NCTI
ON
DETE
CTIO
N---L
IGHT
UP
R2T
THE
RM
ISTO
R (S
UC
TIO
N)
Y3E
ELE
CTR
ON
IC E
XP
AN
SIO
N V
ALV
E (M
1C)
R31
~33T
THE
RM
ISTO
R (M
1C~3
C D
ISC
HA
RG
E)
Y2S
SO
LEN
OID
VA
LVE
(M2C
)
R3T
THE
RM
ISTO
R (H
EA
T E
XC
, DE
ICE
R)
Y3S
SO
LEN
OID
VA
LVE
(4 W
AY
VA
LVE
)
HA
PP
ILO
TLA
MP
(SE
RV
ICE
MO
NIT
OR
-GR
EE
N)
R5T
THER
MIS
TOR
(HEA
T EX
, OF
SUBC
OO
L O
UTLE
T)Y
5SS
OLE
NO
ID V
ALV
E (M
3C)
K1R
,K3R
MA
GN
ETI
C R
ELA
YR
6TTH
ERM
ISTO
R (H
EAT
EX, O
F SU
BCO
OL
INLE
T)Z1
C~1
0CN
OIS
E F
ILTE
R (F
ER
RIT
E C
OR
E)
K2M
, K4M
MA
GN
ETI
C C
ON
TAC
TOR
(M1C
)R
Y1
MA
GN
ETI
C R
ELA
Y (A
9P)
Z1F
NOIS
E FI
LTER
(WIT
H SU
RGE
ABSO
RBER
) (A2
P)
K2M
, K3M
MA
GN
ETI
C C
ON
TAC
TOR
(M2C
, M3C
)S
1NP
HP
RE
SS
UR
E S
EN
SO
R (H
IGH
)
K1R
, K2R
MA
GN
ETI
C R
ELA
Y (K
2M, K
3M)
S1N
PL
PR
ES
SU
RE
SE
NS
OR
(LO
W)
3D06
3035
B
A6P
K2M
BLU
WHT
Y3E M
5
BLU
X23
A
R32
T
t°
X8A
K4R
Y2S
P<
S2PH
K1R X
5AR
ED
WH
TK2
M
A1 A2
X26
A
M 3~ M3C
Z8C
N
=5
RED
WHT
BLK
UV
W
K3M
UV
W
RS
T
A6PT1A
X1A
K3R
Z1C
N=1
RE
D
WH
T
BLK
BLU
X1M L1 L2 L3 N
L1 L2 L3 N NO
TES
)1.
TH
IS W
IRIN
G D
IAG
RA
M IS
AP
PLI
ED
ON
LY
TO T
HE
OU
TDO
OR
UN
IT.
2.
: FIE
LD W
IRIN
G.
3.
: TE
RM
INA
L S
TRIP
: C
ON
NE
CTO
R
:T
ER
MIN
AL
:P
RO
TEC
TIV
E E
AR
TH (S
CR
EW)
4. A
T TH
E T
IME
OF
FAC
TOR
Y S
HIP
ME
NT,
SE
TTIN
G O
F "O
FF".
WH
EN
OP
ER
ATI
NG
, SE
TTIN
G O
F "O
N" O
R "R
EM
OTE
". TH
E P
OIN
T O
F C
ON
TAC
T O
F TH
E IN
PU
T M
US
T U
SE
TH
E O
NE
FO
R A
SLI
GH
T C
UR
RE
NT.
(F
OR
TH
E R
EM
OTE
SW
ITC
H, U
SE
NO
N-V
OLT
AG
E C
ON
TAC
T FO
R M
ICR
OC
UR
RE
NT
(NO
T M
OR
E T
HA
N 1
mA
DC
12V
))5.
BE
NO
TED
TH
AT
THE
CA
PA
CIT
Y O
F C
ON
TAC
T IS
AC
220~
240V
, 0.5
A. (
TOTA
L O
F C
AU
TIO
N O
UTP
UT,
WA
RN
ING
OU
TPU
T)6.
BE
NO
TED
TH
AT
THE
CA
PA
CIT
Y O
F C
ON
TAC
T IS
AC
220~
240V
, 0.5
A. (
OP
ER
ATI
NG
OU
TPU
T)7.
HO
W T
O U
SE
BS
1~5,
DS
1 A
ND
DS
2 S
WIT
CH
, RE
FER
TO
"SE
RV
ICE
PR
EC
AU
TIO
N" L
AB
EL
ON
EL.
CO
MP
O. B
OX
CO
VE
R.
8. W
HE
N O
PE
RA
TIN
G, D
ON
'T S
HO
RTC
IRC
UIT
TH
E P
RO
TEC
TIO
N D
EV
ICE
(S1P
H~S
3PH
).9.
CO
LOR
S B
LK:B
LAC
K R
ED
:RE
D B
LU:B
LUE
WH
T:W
HIT
E G
RN
:GR
EE
N.
10. R
Y1
PO
INT
CO
NTA
CT
IS O
PE
N B
EFO
RE
TU
RN
ING
ON
PO
WE
R S
UP
PLY
.R
EFE
R T
O T
EC
HN
ICA
L G
UID
E F
OR
TH
E O
PE
RA
TIO
N T
IMIN
G D
IAG
RA
M.
M2F
M2C
M3C
X4A
X3A
A7P
K3M A8P
t°
R33
T
Y5S
X15
AK11R
X105
AP
<S3
PH
K2R
X6A
RE
DW
HT
K3M
A1
A2
X25
A
NO
TE) 1
0R
Y1
X2A
X1A
X3A
A9P
Z6C
N=1
T2A
N=1
A7PT1
A
X1A
BLK
RE
D
M 3~
M2C
Z7C
N
=5
RED
WHT
BLK
UV
W
K2M
UV
W
RS
TP
2N
2
X51
A
A8P X5A X3A
P1 F1
U
N1
R10
X4A
X2A
5
X4A
5M
S
3~ M2FRED
WHT
BLK
Z9C
N
=1
X3A
X1A
V1R
RED
RED
WHT
WHT
RED
Standard Specification SiENBE28-901
18 Air Cooled Refrigeration Condensing Unit
2.5 Piping DiagramLRLEQ5A, 6AY1(E)LRMEQ5A, 6AY1(E)
FILTER CHECK VALVE
DOUBLE PIPE HEAT EXCHANGER
SERVICE PORT
CHECK VALVE
ELECTRONIC EXPANSION VALVE
SIGHT GLASS
ELECTRONIC EXPANSION VALVE
FILTER
RECE
IVER
FUSIBLEPLUG
CHECK VALVE PRESSURE REGULATING VALVE
FAN
M HEAT EXCHANGER
FILTER
STOP VALVEHIGH PRESSURE
SWITCH(DEFROST)
FOUR WAY VALVE STOP VALVESERVICE PORTGAUGE PORT
HIGH PRESSURE SENSORSENPH
HP
S
CHECK VALVE
FILTERCAPILLARYTUBE
OIL
SEPA
RATO
R
HIGH PRESSURE SWITCH HPS
COMPRESSORINV
LOW PRESSURE SENSOR
SENPL
GA
UG
E P
OR
TS
ER
VIC
E P
OR
T
LIQUID PIPE φ9.5 C1220T
GAS PIPE φ19.1 C1220T
STOP VALVE (WITH SERVICE PORT φ7.9mm FLARE CONNECTION)
3D064606A
CHECK VALVE
SiENBE28-901 Standard Specification
Air Cooled Refrigeration Condensing Unit 19
LRLEQ8A, 10A, 12AY1(E)LRMEQ8A, 10A, 12AY1(E)
FILTER CHECK VALVE
ELECTRONIC EXPANSION VALVE
SERVICE PORT
CHECK VALVE
PLATE TYPE HEAT EXCHANGER
SIGHT GLASS
ELECTRONIC EXPANSION VALVE
FILTER
RECE
IVER
FUSIBLEPLUG
CHECK VALVE PRESSURE REGULATING VALVE
FAN
M HEAT EXCHANGER
FILTER
STOP VALVEHIGH PRESSURE
SWITCH(DEFROST)
FOUR WAY VALVE STOP VALVESERVICE PORTGAUGE PORT
HIGH PRESSURE SENSORS1NPH
S4PH
CHECK VALVE
FILTERCAPILLARY TUBE
OIL
SEPA
RATO
R
HIGH PRESSURE SWITCH
COMPRESSORINVLOW PRESSURE
SENSORS1NPL
GA
UG
E P
OR
TS
ER
VIC
E P
OR
T
LIQUID PIPE φ9.5 C1220T
GAS PIPE φ25.4 C1220T
STOP VALVE (WITH SERVICE PORT φ7.9mm FLARE CONNECTION)
CHECK VALVEFILTER
S1PH
ELECTRONIC EXPANSION VALVE
OIL
SEPA
RATO
RFILTER
CAPILLARY TUBE HIGH PRESSURE
SWITCH S2PH
COMPRESSORSTD
CHECKVALVE
CHECK VALVE
SOLENOID VALVE
3D064605
SV
Standard Specification SiENBE28-901
20 Air Cooled Refrigeration Condensing Unit
LRLEQ15A, 20AY1(E)LRMEQ15A, 20AY1(E)
FILTER CHECK VALVE
ELECTRONIC EXPANSION VALVE
SERVICE PORT
CHECK VALVE
PLATE TYPE HEAT EXCHANGER
SIGHT GLASS
ELECTRONIC EXPANSION VALVE
FILTER
RECE
IVER
FUSIBLEPLUG
CHECK VALVE PRESSURE REGULATING VALVE
FAN
M HEAT EXCHANGER
FILTER
STOP VALVEHIGH PRESSURE
SWITCH (DEFROST)
FOUR WAY VALVE STOP VALVESERVICE PORTGAUGE PORT
HIGH PRESSURE SENSORS1NPH
S4PH
CHECK VALVE
FILTERCAPILLARY TUBE
OIL
SEPA
RATO
R
HIGH PRESSURE SWITCH
COMPRESSORINVLOW PRESSURE
SENSORS1NPL
GA
UG
E P
OR
TS
ER
VIC
E P
OR
T
LIQUID PIPE φ12.7 C1220T
GAS PIPE φ31.8 C1220T
STOP VALVE (WITH SERVICE PORT φ7.9mm FLARE CONNECTION)
CHECK VALVEFILTER
S1PH
ELECTRONIC EXPANSION VALVE
OIL
SEPA
RATO
R
CAPILLARY TUBE HIGH PRESSURE
SWITCH S3PH
COMPRESSORSTD2
CHECK VALVE
CHECK VALVE
SOLENOID VALVE
3D064603
CHECK VALVE
FILTER
OIL
SEPA
RATO
R
CAPILLARY TUBE HIGH PRESSURE
SWITCH S2PH
COMPRESSORSTD1
CHECK VALVE
CHECK VALVE
SOLENOID VALVE
FILTER
SV SV
SiENBE28-901 Standard Specification
Air Cooled Refrigeration Condensing Unit 21
2.6 Description and Layout of Functional Parts and Piping Diagram
LRMEQ5, 6AY1LRLEQ5, 6AY1
No. Name Symbol Function
1 Inverter compressor (INV) M1C An inverter-driven compressor, which runs at operating frequencies in the range of 52Hz to 218Hz.
2 Fan motor M1F Used to operate a fan for heat exchange through an air heat exchanger.
3 Electronic expansion valve (Main: EV1) Y1E Not used.
4 Electronic expansion valve (Injection: EV2) Y2E Used to control the injection flow rate and the compressor overheat
protection.5 Four way valve Y3S Not used.6 High pressure sensor S1NPH Used to detect high pressure.7 Low pressure sensor S1NPL Used to detect low pressure.
8 High pressure switch S1PHIn order to prevent the increase of high pressure when a malfunction occurs, this switch activated at high pressure of 3.8MPa or more to stop the compressor operation.
9 High pressure switch S4PH Not used.
10 Fusible plug —When the refrigerant of the receiver unit reaches a temperature of 70°C to 75°C, the fusible head of plug will melt, thus discharging the refrigerant of high temperature and high pressure.
11 Pressure regulating valve —Opens when the pressure reaches 4.0 MPa. This prevents an excessive pressure rise caused by the pipes being completely filled with liquid when not in operation.
12 Double pipe heat exchanger — Used to cool the liquid refrigerant from the liquid receiver.
13 Stop valve (Heat exchanger on primary side) — Used to service.
14Stop valve (Double pipe heat exchanger on secondary side)
— Used to service.
15 Service port — For gas (high pressure).16 Service port — For liquid (high pressure).17 Service port — For gas (low pressure).
18 Oil separator —
Refrigerant gas discharged from the compressor contains lubricating oil in the compressor. If the amount of this lubricating oil is large, the oil quantity in the compressor will become short, which may result in defective lubrication.Furthermore, this oil stains the heat transfer surface of condenser or evaporator and reduces the effectiveness of the heat exchanger. To avoid that, an oil separator is installed in close proximity to the discharge pipe of the compressor, where oil is separated and collected to return to the compressor.
19 Liquid receiver —Used to compensate the variations in handling of refrigerant, thus providing stable operating conditions at all times. In order to repair in the refrigerant circuit, this receiver collects the refrigerant and facilitates the repairing of the parts.
20 Sight glass — Used to test run and service.
A Thermistor (Outdoor air: Ta) R1T Used to detect the outdoor temperature and control the fan operation.
B Thermistor (Suction pipe: Ti) R2T Used to detect the suction pipe temperature of M1C compressor and
protect this compressor.
C Thermistor (INV discharge pipe: Td1) R31T Used to detect the discharge pipe temperature of M1C compressor and
control over discharge pipe temperature of this compressor for protection.
D Thermistor (Heat exchanger deicer: Tce) R3T Not used.
E Thermistor (Double pipe heat exchanger outlet: Tg) R5T
Used to detect the gas temperature at evaporator side of double pipe heat exchanger, and keep the constant overheated degree of double pipe heat exchanger.
F Thermistor (Double pipe heat exchanger inlet: TL) R6T Used to detect the gas saturation temperature at evaporator side of double
pipe heat exchanger.
Standard Specification SiENBE28-901
22 Air Cooled Refrigeration Condensing Unit
LRMEQ5, 6AY1LRLEQ5, 6AY1
FILTER
DOUBLE PIPE HEAT EXCHANGER
SERVICE PORT
CHECK VALVE
ELECTRONIC EXPANSION VALVE
SIGHT GLASS
ELECTRONIC EXPANSION VALVE
FILTER
RECE
IVER
FUSIBLEPLUG CHECK VALVE PRESSURE
REGULATING VALVE
FAN
M HEAT EXCHANGER
FILTER
STOP VALVEHIGH PRESSURE
SWITCH(DEFROST)
FOUR WAY VALVE STOP VALVE
SERVICE PORT
GAUGE PORT
HIGH PRESSURE SENSORS1NPH
S4PH
CHECK VALVE
FILTERCAPILLARYTUBE
OIL
SEPA
RATO
R
HIGH PRESSURE SWITCH S1PH
COMPRESSORINV
LOW PRESSURE SENSOR
S1NPL
GA
UG
E P
OR
TS
ER
VIC
E P
OR
T
LIQUID PIPE φ9.5 C1220T
GAS PIPE φ19.1 C1220T
STOP VALVE (WITH SERVICE PORT φ7.9mm FLARE CONNECTION)
CHECK VALVE(12)
(F)
(4)
(20)
(E)(16)
(3)
(19)(10)
(11)
(D)
(A)
(2)
(13)
(6)
(15)
(5)
(18)
(8)
(C)
(1)
(B)
(9)
(14)
(17)
(7)
SiENBE28-901 Standard Specification
Air Cooled Refrigeration Condensing Unit 23
LRMEQ5, 6AY1LRLEQ5, 6AY1
19 10
18
C R31T
2 M1F
6
7
S1NPH
S1NPL
15BAF
8
1 M1C
S1PH
R6T
R1TR2T
20
11
E
DR3T
R5T
16
149
3Y1E13
Y2E 4
5Y3S
12
17
S4PH
Standard Specification SiENBE28-901
24 Air Cooled Refrigeration Condensing Unit
LRMEQ8, 10, 12AY1LRLEQ8, 10, 12AY1
No. Name Symbol Function
1 Inverter compressor (INV) M1C An inverter-driven compressor, which runs at operating frequencies in the range of 52Hz to 232Hz.
2 Standard compressor (STD) M2C A compressor, which runs with commercial power supply.3 Fan motor M1F Used to operate a fan for heat exchange through an air heat exchanger.
4 Electronic expansion valve (Main: EV1) Y1E Not used.
5 Electronic expansion valve (Injection: EV2) Y2E Used to control the injection flow rate and the compressor overheat
protection.
6 Electronic expansion valve (M1C: EV3) Y3E
Returns the oil to the inverter compressor and creates a gas-injection economizer circuit. In addition, this controls the difference in discharge pipe temperatures between INV compressor and STD compressor.
7 Solenoid valve Y2S Returns the oil to the M2C and creates a gas-injection economizer circuit.8 Four way valve Y3S Not used.9 High pressure sensor S1NPH Used to detect high pressure.
10 Low pressure sensor S1NPL Used to detect low pressure.
11 High pressure switch (for INV) S1PH In order to prevent the increase of high pressure when a malfunction
occurs, this switch activated at high pressure of 3.8MPa or more to stop the compressor operation.12 High pressure switch (for
STD) S2PH
13 High pressure switch S4PH Not used.
14 Fusible plug —When the refrigerant of the receiver unit reaches a temperature of 70°C to 75°C, the fusible head of plug will melt, thus discharging the refrigerant of high temperature and high pressure.
15 Pressure regulating valve —Opens when the pressure reaches 4.0 MPa. This prevents an excessive pressure rise caused by the pipes being completely filled with liquid when not in operation.
16 Plate type heat exchanger — Used to cool the liquid refrigerant from the liquid receiver.
17 Stop valve (Heat exchanger on primary side) — Used to service.
18 Stop valve (Double pipe heat exchanger on secondary side) — Used to service.
19 Service port — For gas (high pressure).20 Service port — For liquid (high pressure).21 Service port — For gas (low pressure).
22 Oil separator —
Refrigerant gas discharged from the compressor contains lubricating oil in the compressor. If the amount of this lubricating oil is large, the oil quantity in the compressor will become short, which may result in defective lubrication.Furthermore, this oil stains the heat transfer surface of condenser or evaporator and reduces the effectiveness of the heat exchanger. To avoid that, an oil separator is installed in close proximity to the discharge pipe of the compressor, where oil is separated and collected to return to the compressor.
23 Liquid receiver —Used to compensate the variations in handling of refrigerant, thus providing stable operating conditions at all times. In order to repair in the refrigerant circuit, this receiver collects the refrigerant and facilitates the repairing of the parts.
24 Sight glass — Used to test run and service.
A Thermistor (Outdoor air: Ta) R1T Used to detect the outdoor temperature and control the fan operation.
B Thermistor (Suction pipe: Ti) R2T Used to detect the suction pipe temperature of M1C and M2C compressor
and protect this compressor.
C Thermistor (INV discharge pipe: Td1) R31T Used to detect the discharge pipe temperature of M1C compressor and
control over discharge pipe temperature of this compressor for protection.
D Thermistor (STD discharge pipe: Td2) R32T Used to detect the discharge pipe temperature of M2C compressor and
control over discharge pipe temperature of this compressor for protection.
E Thermistor (Heat exchanger deicer: Tce) R3T Not used.
F Thermistor (Plate type heat exchanger outlet: Tg) R5T Used to detect the gas temperature at evaporator side of double pipe heat exchanger,
and keep the constant overheated degree of double pipe heat exchanger.
G Thermistor (Plate type heat exchanger inlet: TL) R6T Used to detect the gas saturation temperature at evaporator side of double
pipe heat exchanger.
SiENBE28-901 Standard Specification
Air Cooled Refrigeration Condensing Unit 25
LRMEQ8, 10, 12AY1LRLEQ8, 10, 12AY1
FILTER CHECK VALVE
ELECTRONIC EXPANSION VALVE
SERVICE PORT
CHECK VALVE
PLATE TYPE HEAT EXCHANGER
SIGHT GLASS
FILTER
RECE
IVER
FUSIBLEPLUG
CHECK VALVE PRESSURE REGULATING VALVE
FAN
M HEAT EXCHANGER
FILTER
STOP VALVEHIGH PRESSURE
SWITCH (DEFROST)
FOUR WAY VALVE STOP VALVESERVICE PORT
HIGH PRESSURE SENSORS1NPH
S4PH
CHECK VALVE
FILTERCAPILLARY TUBE
OIL
SEPA
RATO
R
HIGH PRESSURE SWITCH
COMPRESSORINVLOW PRESSURE
SENSORS1NPL
GA
UG
E P
OR
TS
ER
VIC
E P
OR
T
LIQUID PIPE φ9.5 C1220T
GAS PIPE φ25.4 C1220T
STOP VALVE (WITH SERVICE PORT φ7.9mm FLARE CONNECTION)
CHECK VALVEFILTER
S1PH
ELECTRONIC EXPANSION VALVE
OIL
SEPA
RATO
RFILTER
CAPILLARY TUBE HIGH PRESSURE
SWITCH S2PH
COMPRESSORSTD
CHECKVALVE
CHECK VALVE
SOLENOID VALVE
(20) (5)
(G)
(F) (16)
(23)
(14)(15)
(E)
(3)
(A)(17)
(19)GAUGE PORT
(9)
(8)
(13)
(18)
(11)
(22)
(C)
(24)
ELECTRONIC EXPANSION VALVE
(4)
(1)(6)
(B)
(21)
(10)
(22)
(12)(D)
(2)(7)
SV
Standard Specification SiENBE28-901
26 Air Cooled Refrigeration Condensing Unit
LRMEQ8, 10, 12AY1LRLEQ8, 10, 12AY1
16
C R31T
S1NPH
23 14 22 6 7Y3E Y2S
D R32T
3 M1F
9
21
10 S1NPL
B11
R2TS1PH
12 S2PH
A
1
2
M1C
R1T
M2C
R5T
Y2E
Y3SS4PH
18
F
R3T E
R6T G
15
24
20
5
Y1E 4
13 8
17
19
SiENBE28-901 Standard Specification
Air Cooled Refrigeration Condensing Unit 27
LRMEQ15, 20AY1LRLEQ15, 20AY1
No. Name Symbol Function
1 Inverter compressor (INV) M1C An inverter-driven compressor, which runs at operating frequencies in the range of 52Hz to 232Hz.
2 Standard compressor (STD 1) M2CA compressor, which runs with commercial power supply.
3 Standard compressor (STD 2) M3C4 Fan motor M1F Used to operate a fan on the right for heat exchange through an air heat exchanger.5 Fan motor M2F Used to operate a fan on the left for heat exchange through an air heat exchanger.
6 Electronic expansion valve (Main: EV1) Y1E Not used.
7 Electronic expansion valve (Injection: EV2) Y2E Used to control the injection flow rate and the compressor overheat
protection.
8 Electronic expansion valve (M1C: EV3) Y3E
Returns the oil to the inverter compressor and creates a gas-injection economizer circuit. In addition, this controls the difference in discharge pipe temperatures between INV compressor and STD compressor.
9 Solenoid valve Y2S Returns the oil to the M2C and creates a gas-injection economizer circuit.10 Four way valve Y3S Not used.11 Solenoid valve Y5S Returns the oil to the M3C and creates a gas-injection economizer circuit.12 High pressure sensor S1NPH Used to detect high pressure.13 Low pressure sensor S1NPL Used to detect low pressure.14 High pressure switch (for INV) S1PH In order to prevent the increase of high pressure when a malfunction
occurs, this switch activated at high pressure of 3.8MPa or more to stop the compressor operation.
15 High pressure switch (for STD 1) S2PH16 High pressure switch (for STD 2) S3PH17 High pressure switch S4PH Not used.
18 Fusible plug —When the refrigerant of the receiver unit reaches a temperature of 70°C to 75°C, the fusible head of plug will melt, thus discharging the refrigerant of high temperature and high pressure.
19 Pressure regulating valve —Opens when the pressure reaches 4.0 MPa. This prevents an excessive pressure rise caused by the pipes being completely filled with liquid when not in operation.
20 Plate type heat exchanger — Used to cool the liquid refrigerant from the liquid receiver.
21 Stop valve (Heat exchanger on primary side) — Used to service.
22 Stop valve (Double pipe heat exchanger on secondary side) — Used to service.
23 Service port — For gas (high pressure).24 Service port — For liquid (high pressure).25 Service port — For gas (low pressure).
26 Oil separator —
Refrigerant gas discharged from the compressor contains lubricating oil in the compressor. If the amount of this lubricating oil is large, the oil quantity in the compressor will become short, which may result in defective lubrication.Furthermore, this oil stains the heat transfer surface of condenser or evaporator and reduces the effectiveness of the heat exchanger. To avoid that, an oil separator is installed in close proximity to the discharge pipe of the compressor, where oil is separated and collected to return to the compressor.
27 Liquid receiver —Used to compensate the variations in handling of refrigerant, thus providing stable operating conditions at all times. In order to repair in the refrigerant circuit, this receiver collects the refrigerant and facilitates the repairing of the parts.
28 Sight glass — Used to test run and service.A Thermistor (Outdoor air: Ta) R1T Used to detect the outdoor temperature and control the fan operation.
B Thermistor (Suction pipe: Ti) R2T Used to detect the suction pipe temperature of M1C~M3C compressor and protect this compressor.
C Thermistor (INV discharge pipe: Td1) R31T Used to detect the discharge pipe temperature of M1C compressor and
control over discharge pipe temperature of this compressor for protection.
D Thermistor (STD 1 discharge pipe: Td2) R32T Used to detect the discharge pipe temperature of M2C compressor and
control over discharge pipe temperature of this compressor for protection.
E Thermistor (STD 2 discharge pipe: Td3) R33T Used to detect the discharge pipe temperature of M3C compressor and
control over discharge pipe temperature of this compressor for protection.
F Thermistor (Heat exchanger deicer: Tce) R3T Not used.
G Thermistor (Plate type heat exchanger outlet: Tg) R5T Used to detect the gas temperature at evaporator side of double pipe heat exchanger,
and keep the constant overheated degree of double pipe heat exchanger.
H Thermistor (Plate type heat exchanger inlet: TL) R6T Used to detect the gas saturation temperature at evaporator side of double
pipe heat exchanger.
Standard Specification SiENBE28-901
28 Air Cooled Refrigeration Condensing Unit
LRMEQ15, 20AY1LRLEQ15, 20AY1
FILTER CHECK VALVE
ELECTRONIC EXPANSION VALVE
SERVICE PORT
CHECK VALVE
PLATE TYPE HEAT EXCHANGER
SIGHT GLASS
ELECTRONICEXPANSION VALVE
FILTER
RECE
IVER
FUSIBLEPLUG
CHECK VALVE PRESSURE REGULATING VALVE
FAN
M HEAT EXCHANGER
FILTER
STOP VALVEHIGH PRESSURE
SWITCH(DEFROST)
FOUR WAY VALVE STOP VALVESERVICE PORTGAUGE PORT
HIGH PRESSURE SENSORS1NPH
S4PH
CHECK VALVE
FILTERCAPILLARY TUBE
OIL
SEPA
RATO
R
HIGH PRESSURE SWITCH
COMPRESSORINVLOW PRESSURE
SENSORS1NPL
GA
UG
E P
OR
TS
ER
VIC
E P
OR
T
LIQUID PIPE φ12.7 C1220T
GAS PIPE φ31.8 C1220T
STOP VALVE (WITH SERVICE PORT φ7.9mm FLARE CONNECTION)
CHECK VALVEFILTER
S1PH
ELECTRONIC EXPANSION VALVE
OIL
SEPA
RATO
R
CAPILLARY TUBE HIGH PRESSURE
SWITCH S3PH
COMPRESSORSTD2
CHECK VALVE
CHECK VALVE
SOLENOID VALVE
CHECK VALVE
FILTER
OIL
SEPA
RATO
R
CAPILLARY TUBE HIGH PRESSURE
SWITCH S2PH
COMPRESSORSTD1
CHECK VALVE
CHECK VALVE
SOLENOID VALVE
FILTER
(24)(7)
(H)
(G) (20)
(28)
(6)
(27) (18)
(19)
(F)
(4)(5)
(A)(21)
(23)
(12)
(10)
(17)
(22)
(25)
(13)(B)
(8)
(14)
(26)
(1)
(C)(15)
(9)(2)
(D)
(26)
(16)
(3)(11)
(E)
(26)
SV SV
SiENBE28-901 Standard Specification
Air Cooled Refrigeration Condensing Unit 29
LRMEQ15, 20AY1LRLEQ15, 20AY1
C R31T
26 8Y3E Y2S
D R32T
13 S1NPL
B R2T
A1
2
M1CR1T
M2C
R5T
Y2E
Y3S
S4PH
G
9Y2S Y5S
11182720
R33TE
4
12 S1NPH
16 S3PH15 S2PH
3
M2C
M3CR6T H
R3T F28 22
6Y1E
2419
717
21
102523
5
14S1PH
Field Settings SiENBE28-901
30 Air Cooled Refrigeration Condensing Unit
3. Field Settings3.1 Field Setting From Outdoor Unit
The target evaporation temperature can be calculated as follows:Tst : Target evaporation temperatureTsd : Evaporation temperature set by dip switchesΔTsp: Temperature correction setting by pushbuttons.ΔTsn: Temperature correction setting during night-time operation
The evaporation temperature can be set by dip switches and pushbuttons on the outdoor unit PCB.The dip switches can be set when the power is turned off, while the pushbuttons can be set while the condensing unit is operating.Note that the actual evaporation temperature may be lower than that specified, if the outdoor temperature is too low. (This is intended to protect the compressors.) Do not set the evaporation temperature to less than the values below. (This may damage the compressors.)
MT series : -20°CLT series : -45°C
(1) Field settings by dip switchesBe sure to turn off the power before changing the DIP switch settings.DS1-1 to 3 enable setting the saturated temperature equivalent to suction pressure (in increments of 5°C).Do not change the settings of DS1-4, DS2-1 to 4.
Tst = Tsd + ΔTsp + ΔTsn
Location of soft switches
Location of dip switches
DS1 DS2
ON
OFF
Dip switches 1 to 3
1 2 3 4 5 6 7 8
The evaporation temperature setting (specified using the dip switches) can be changed using the pushbuttons, within the range of -4K to +4K, in steps of about 1K. Refer the setting method on next page.
Switch box
Main PCB
SiENBE28-901 Field Settings
Air Cooled Refrigeration Condensing Unit 31
Tsd: The evaporation temperature set by the dip switches.
DS1Tsd
DS1Tsd
LRMEQ** LRLEQ** LRMEQ** LRLEQ**
-10°C(0.47MPa)
-35°C(0.11MPa)
0°C(0.69MPa)
-25°C(0.22MPa)
-20°C(0.29MPa)
-45°C(0.03MPa)
5°C(0.82MPa)
-20°C(0.29MPa)
-15°C(0.37MPa)
-40°C(0.07MPa)
10°C(0.98MPa)
-5°C(0.56MPa)
-30°C(0.16MPa)
ON
OFF1 2 3 4Factory set
ON
OFF1 2 3 4
ON
OFF1 2 3 4
ON
OFF1 2 3 4
ON
OFF1 2 3 4
ON
OFF1 2 3 4
ON
OFF1 2 3 4
ON
OFF1 2 3 4Factory set
Field Settings SiENBE28-901
32 Air Cooled Refrigeration Condensing Unit
Setting at replacement by spare PCB
Caution DIP switch setting after changing the main PCB to spare parts PCB
In case of repair using this part, replace the part according to the following instruction. Make the following capacity and refrigeration / freezing settings subject to application models.Cut the power supply of the outdoor unit once and switch it on again after setting the switch of subject.
Freezer: LRLEQ5~20AY1 (E)
Applicable model Setting method ( the position of switches)
LRLEQ5AY1 (E) Set DS2-2 and DS2-4 to ON
LRLEQ6AY1 (E) Set DS2-1 and DS2-4 to ON
LRLEQ8AY1 (E) Set DS2-1, DS2-2 and DS2-4 to ON
LRLEQ10AY1 (E) Set DS1-4 and DS2-4 to ON
LRLEQ12AY1 (E) Set DS1-4, DS2-2 and DS2-4 to ON
LRLEQ15AY1 (E) Set DS1-4, DS2-1 and DS2-4 to ON
LRLEQ20AY1 (E) Set DS1-4, DS2-1, DS2-2 and DS2-4 to ON
LED
EB**** DS1DS2Factory Set ( the position of a switch)
ON
OFF
1 2 3 4 1 2 3 4DS1 DS2
ON
OFF1 2 3 4 1 2 3 4
ON
OFF1 2 3 4 1 2 3 4
ON
OFF1 2 3 4 1 2 3 4
ON
OFF1 2 3 4 1 2 3 4
ON
OFF1 2 3 4 1 2 3 4
ON
OFF1 2 3 4 1 2 3 4
ON
OFF1 2 3 4 1 2 3 4
SiENBE28-901 Field Settings
Air Cooled Refrigeration Condensing Unit 33
Refrigerator: LRMEQ5~20AY1 (E)
Applicable model Setting method ( the position of switches)
LRMEQ5AY1 (E) Set DS2-2 to ON
LRMEQ6AY1 (E) Set DS2-1 to ON
LRMEQ8AY1 (E) Set DS2-1 and DS2-2 to ON
LRMEQ10AY1 (E) Set DS1-4 to ON
LRMEQ12AY1 (E) Set DS1-4 and DS2-2 to ON
LRMEQ15AY1 (E) Set DS1-4 and DS2-1 to ON
LRMEQ20AY1 (E) Set DS1-4, DS2-1 and DS2-2 to ON
LED
EB**** DS1DS2Factory Set ( the position of a switch)
ON
OFF
1 2 3 4 1 2 3 4DS1 DS2
ON
OFF1 2 3 4 1 2 3 4
ON
OFF1 2 3 4 1 2 3 4
ON
OFF1 2 3 4 1 2 3 4
ON
OFF1 2 3 4 1 2 3 4
ON
OFF1 2 3 4 1 2 3 4
ON
OFF1 2 3 4 1 2 3 4
ON
OFF1 2 3 4 1 2 3 4
Field Settings SiENBE28-901
34 Air Cooled Refrigeration Condensing Unit
(2) Setting in service modeUsing pushbuttons on the Main PCB (A1P) enables a variety of settings shown below.
The following 4 modes are available.
Procedure for changing mode
Steps to change mode
Caution Turn off the RUN switch of the outdoor unit in case of the setting.
a. Setting mode 1 ......(H1P: OFF)
Initial state (while in normal operation): Used to make setting of the method of "Cool/Heat selection".This mode is displayed while in "malfunction", "low noise control", and "demand control" as well.
b. Setting mode 2Setting mode 3 ......(H1P: ON)
Used to make changes of operating conditions or settings of a variety of addresses, mainly for service work.
c. Monitor mode ......(H1P: BLINK)
Used to check the contents set in Setting mode 2.
While in each mode, use the MODE button to change settings as shown below.
BS1
MODE
BS2
SET
BS3
RETURN
BS4 BS5
RESET
Setting mode 2MODE
H1PON
Setting mode 1MODE
H1POFF
Monitor modeMODE
H1PBLINK
Setting mode 3
Simultaneously press and hold the BS1 (MODE) and BS3 (RETURN) for a period of 5 seconds.Press and hold the BS1
(MODE) for a period of five seconds.
Press the BS1 (MODE) once.
(Normal)
Press the BS1 (MODE) once.
OP :Select mode with the use of BS2 (SET) in each selection step.Press and hold the BS1
(MODE) for a period of five seconds.
Setting mode 1(Initial state)
Setting mode 2
Press the BS1 (MODE) once.
Selection of setting items SET
Selection of setting contents SET
Press the BS3 (RETURN).
Press the BS3 (RETURN).
Display of setting contents
Press the BS3 (RETURN).
Press the BS1 (MODE).
Monitor mode
Selection of check items SET
Display of contents
Press the BS3 (RETURN).
Press the BS3 (RETURN).
Press the BS1 (MODE).
SiENBE28-901 Field Settings
Air Cooled Refrigeration Condensing Unit 35
LED display when power is onH2P blinks for the first five seconds when the power supply is turned on. If the equipment is normal, H2P will be turned off in five seconds. H2P lights for abnormality.
k: ON h: OFF l: BLINKNo. H1P H2P H3P H4P H5P H6P H7P
(Immediately after power on)1 h l k h h h h
No. H1P H2P H3P H4P H5P H6P H7P(5 seconds after power on)
1 h h k h h h h
Field Settings SiENBE28-901
36 Air Cooled Refrigeration Condensing Unit
b-1. Setting mode 2
The number in the “No.” column represent the number of times to press the SET (BS2) button.
No.Display of setting items
Display of setting conditionsSetting item H1P H2P H3P H4P H5P H6P H7P
0 ΔTsp: Fine-tuning setting of evaporation temperature k h h h h h h
2 Current limitation setting k h h h h k h
3 Setting of limit value of outdoor fan taps k h h h h k k
5Setting of external low noise operation(Tax1, 2 and Tay1, 2 are set by setting 2-21. )
k h h h k h k
6 AIRNET address k h h h k k h
7Setting of night-time low noise operation (Only connected to AIRNET)
k h h h k k k
8Night-time low noise start setting.It uses it for setting 2-7 and 2-11. (Only connected to AIRNET)
k h h k h h h
9Night-time low noise end setting.It uses it for setting 2-7 and 2-11. (Only connected to AIRNET)
k h h k h h k
11ΔTsn: Evaporation temperature
correction setting during operation at night-time
k h h k h k k
21Setting of external temperature of outdoor fan tapIt uses it by setting 2-5.
k h h k k h k
40 Setting of high static pressure of outdoor fan k h k h h h k
(*1) Standard setting High static pressure settingModel name LRM(L)EQ6,12,20AY1 LRM(L)EQ5,8,10,15,20AY1 LRM(L)EQ6,12,15,20AY1 LRM(L)EQ5,8,10AY1Factory set 9 9 8 8Setting 1 8 10 7 9Setting 2 7 8 6 7Setting 3 6 7 5 6Setting 4 5 6 5 5Setting 5 5 5 5 5
H1P H2P H3P H4P H5P H6P H7P
ΔTsp
0K (Factory set) k h h h h h h
-1°C k h h h h h k
-2°C k h h h h k h
-3°C k h h h h k k
-4°C k h h h k h h
-5°C k h h h k h k
+1°C k h h h k k h
+2°C k h h h k k k
+3°C k h h k h h h
+4°C k h h k h h k
+5°C k h h k h k h
LRM(L)EQH1P H2P H3P H4P H5P H6P H7P
5,6AY1 8,10,12AY1 15,20AY1No limitation. (Factory set) k h h h h h k
10A 20A 36A k h h h h k h
9A 18A 30A k h h h k h h
7A 14A 27A k h h k h h h
H1P H2P H3P H4P H5P H6P H7P
Details depend on the following.(*1)
(Factory set) k h h h h h k
Setting 1 k h h h h k h
Setting 2 k h h h k h h
Setting 3 k h h k h h h
Setting 4 k h k h h h h
Setting 5 k k h h h h h
H1P H2P H3P H4P H5P H6P H7P6 (Tamb≤Tax1)7(Tay1<Tamb≤Tax2)9(Tamb<Tay2) (Factory set)
k h h h h h k
5(Tamb≤Tax1)6(Tay1<Tamb≤Tax2)9(Tamb<Tay2)
k h h h h k h
H1P H2P H3P H4P H5P H6P H7P Please give the address of 1 or more when you do the AIRNET. Binary system for address(six digits)
(Factory set) 0 k h h h h h h
1 k h h h h k k
~63 k h k k k k k
Standard setting
High static pressure setting H1P H2P H3P H4P H5P H6P H7P
9 9 k h h h h h k
8 7 k h h h h k h
7 8 k h h h k h h
6 6 k h h k h h h
5 5 k h k h h h h
4 4 k k h h h h h
H1P H2P H3P H4P H5P H6P H7P21:00 (Factory set) k h h h h h k
22:00 k h h h h k h
23:00 k h h h k h h
20:00 k h h k h h h
H1P H2P H3P H4P H5P H6P H7P7:00 (Factory set) k h h h h h k
8:00 k h h h h k h
9:00 k h h h k h h
6:00 k h h k h h h
As for Factory set, time zone between 2-8 and 2-9 becomes effective for setting.
H1P H2P H3P H4P H5P H6P H7P+1°C(Factory set) k h h h h h k
+2°C k h h h h k h
+3°C k h h h k h h
0°C k h h k h h h
Tax1 Tay1 Tax2 Tay2 H1P H2P H3P H4P H5P H6P H7P26°C 28°C 31°C 33°C k h h h h h k
20°C 22°C 26°C 28°C k h h h h k h
27°C 29°C 32°C 34°C k h h h k h h
H1P H2P H3P H4P H5P H6P H7PStandard setting(Factory set) k h h h h h k
High static pressure setting k h h h h k h
SiENBE28-901 Field Settings
Air Cooled Refrigeration Condensing Unit 37
b-2. Setting mode 2 (for service)
c. Setting mode 3 (for servicing)
c. Setting mode 3 (for servicing)Check when malfunction code “PJ” is displayed.
No.Display of setting items
Display of setting conditionsSetting item H1P H2P H3P H4P H5P H6P H7P
4 INV compressor max. frequency step control k h h h k h h
10Setting of night-time compressor frequency reductionSet the start time with 2-8, set the end time with 2-9.
k h h k h k h
14 Correction of fan revolution according to the high pressure k h h k k k h
19 Oil recovery continuous operation time k h k h h k k
20 Speed change for cooling capacity reduction k h k h k h h
27 INV compressor forced stop k h k k h k k
43 STD1 compressor forced stop k k h k h k k
44 STD2 compressor forced stop k k h k k h h
No.Display of setting items
Display of setting conditionsSetting item H1P H2P H3P H4P H5P H6P H7P
3-21 Changing the compressor steps during target oil recovery k k h k k h h
No.Display of setting items
Display of setting conditionsSetting item H1P H2P H3P H4P H5P H6P H7P
3-10 Capacity setting k h h k h k h
3-26 Setting the freezing and refrigeration k h k k h k h
3-39 Power supply voltage setting k k h h k k k
(Factory set)
5A 6A 8A 10A 12A 15A 20A H1P H2P H3P H4P H5P H6P H7P
Comp
ress
or ste
p con
trol 15 21 34 39 42 58 62 k h h h h h h
14 18 38 36 38 62 58 k h h h h h k
13 17 42 42 36 57 k h h h h k h
21 40 60 k h h h h k k
16 36 56 k h h h k h h
15 35 55 k h h h k h k
14 34 54 k h h h k k h
5A 6A 8A 10A 12A 15A 20A H1P H2P H3P H4P H5P H6P H7PCompressor steps (Factory set) k h h h h h h
Setting step: 1 Setting step: 2 k h h h h h k
Setting step: 2 Setting step: 4 k h h h h k h
Setting step: 3 Setting step: 6 k h h h h k k
Setting step: 4 Setting step: 8 k h h h k h h
Setting step: 5 Setting step: 10 k h h h k h k
Setting step: 6 Setting step: 12 k h h h k k h
H1P H2P H3P H4P H5P H6P H7PHigh pressure correction = 0 (Factory set) k h h h h h k
High pressure correction = -0.2 k h h h h k h
High pressure correction = 0.2 k h h h k h h
High pressure correction = 0.4 k h h k h h h
High pressure correction = 0.6 k h k h h h h
H1P H2P H3P H4P H5P H6P H7P40 min. (Factory set) k h h h h h k
30 min. k h h h h k h
20 min. k h h h k h h
H1P H2P H3P H4P H5P H6P H7P30 sec. (Factory set) k h h h h h k
10 sec. k h h h h k h
To reset the compressor after a forced stop, turn the power off and back on again.
H1P H2P H3P H4P H5P H6P H7PNormal control (Factory set) k h h h h h k
Inverter compressor forced stop k h h h h k h
To reset the compressor after a forced stop, turn the power off and back on again.
H1P H2P H3P H4P H5P H6P H7PNormal control (Factory set) k h h h h h k
STD1 compressor forced stop k h h h h k h
To reset the compressor after a forced stop, turn the power off and back on again.
H1P H2P H3P H4P H5P H6P H7PNormal control (Factory set) k h h h h h k
STD2 compressor forced stop k h h h h k h
5A, 6A 8A, 10A, 12A 15A, 20A H1P H2P H3P H4P H5P H6P H7P
Compressor frequency
13 27 34k h h h h h k
Factory set17 31 42 k h h h h k h
H1P H2P H3P H4P H5P H6P H7PLRM(L)EQ5AY1 k h h h h h k
LRM(L)EQ6AY1 k h h h h k h
LRM(L)EQ8AY1 k h h h h k k
LRM(L)EQ10AY1 k h h h k h h
LRM(L)EQ12AY1 k h h h k h k
LRM(L)EQ15AY1 k h h h k k k
LRM(L)EQ20AY1 k h h k h h h
H1P H2P H3P H4P H5P H6P H7PEffective setting of Dip switches k h h h h h k
Freezing k h h h h k h
Refrigeration k h h h k h h
H1P H2P H3P H4P H5P H6P H7P200V k h h h h h k
400V k h h h h k h
Field Settings SiENBE28-901
38 Air Cooled Refrigeration Condensing Unit
d. Setting method with the AIRNET or type-III checker.1) In case of the AIRNET
• Use Setting Mode 2-6 (AIRNET address).• Use Setting Mode 2-16 (virtual indoor unit address).
2) In case of a Type-III checker• Use Setting Mode 2-16 (virtual indoor unit address).
No.Display of setting items
Display of setting conditionsSetting item H1P H2P H3P H4P H5P H6P H7P
6 AIRNET address k h h h k k h
16 Virtual indoor unit address setting k h k h h h h • When there is 1 outdoor unit, set the address to "1".
• When there are multiple outdoor units (outdoor-outdoor transmission connection), contact the After Sales Service Division.
H1P H2P H3P H4P H5P H6P H7P Please give the address of 1 or more to when you do the AIRNET.Uses binary numbers for the address (six digits).
(Factory set) 0 k h h h h h h
1 k h h h h h k
~
63 k k k k k k k
H1P H2P H3P H4P H5P H6P H7P(Factory set) 0 k h h h h h h
1 k h h h h h k
~63 k k k k k k k
SiENBE28-901 Field Settings
Air Cooled Refrigeration Condensing Unit 39
3.1.1 Evaporation temperature correction at night-time, using an external contact
The two methods can be used to increase the evaporation temperature at night-time below:1. Receiving the time setting from the AIRNET (Setting Mode 2-8·9).2. Using an external contact.
The following describes the wiring needed to use an external contact.By a short-circuit between terminals A and C on the PCB (A5P) in the control box, the evaporation temperature can be corrected at night-time.For details about the wiring, refer to Figure 1. Protect the terminals using insulation sleeves or equivalent.
When used in conjunction with a remote switch, connect the wire to the terminal using a ring connector (refer to Figure 2), or connect it to terminal C (refer to Figure 3). The terminal connectors must be protected with insulation sleeves.
By using the Setting Mode 2-8·9, you can change the amount of evaporation temperature shift that is allowed during the night-time evaporation temperature correction.The shift amount is factory set to 1°C.Moreover, the signal from the external contact will take precedence over the setting specified in Setting Mode 2-8·9.
Electric wire thickness 0.75 - 1.25 mm2
Wiring length Max. 100 m
Contact rating Minimum applied load12 VDC, 1 mA or less
Contact for an evaporation temperature correction at night-time:Contact ON: Enabled.Contact OFF: Disabled.
X3M1 2
A B C
A5P
<Figure 1>
Closed-end connector
To remote switch
<Figure 2> <Figure 3>
X3M1 2
A5P
A B C
X3M1 2
A5P
A B C
To remote switch
Description of Functions and Operation SiENBE28-901
40 Air Cooled Refrigeration Condensing Unit
4. Description of Functions and Operation4.1 Operating Mode
[Classification of operating modes]The table below lists all the operating modes available.
<List of operating modes>
1 There are 8 operating modes available. (This includes a mode in which the system is stopped.)
2 Operating modes 5, 6 and 7 are INV compressor abnormal operation modes.If operating mode is 4 or 7, the STD1 compressor may be defective.If operating mode is 1, 2 or 5, the STD2 compressor may be defective.
3 The state in which all the compressors are stopped is operating mode 0.
Compressor Cooling operation (Operating Mode) (1 compressor) (2 compressors) (3 compressors)
INV 1 k k k
INV+STD1 2 k k
INV+STD1+STD2 3 k
INV+STD2 4 k
STD1 5 k k
STD1+STD2 6 k
STD2 7 k
SiENBE28-901 Description of Functions and Operation
Air Cooled Refrigeration Condensing Unit 41
1) Operation Mode 1
<In case of 1 compressor>
<In case of 2 compressors>
HPSL
HPS1
HP
Td1
INV
Tg
LP
EV2
TL EV1
Tce
Ti Ta
HPSL
HPS1 HPS2
HP
Td1 Td2
LP
Ti
EV3 SV2
INV STD1
Tg
EV2
TL
EV1
Tce
Ta
Description of Functions and Operation SiENBE28-901
42 Air Cooled Refrigeration Condensing Unit
<In case of 3 compressors>
HPSL
HPS1 HPS2
HP
Td1 Td2EV3
SV2INV STD1
Tg
EV2
TL
EV1
Tce
Ta
HPS3
Td3
SV3STD2
Ti
SiENBE28-901 Description of Functions and Operation
Air Cooled Refrigeration Condensing Unit 43
2) Operation Mode 2
<In case of 2 compressors>
<In case of 3 compressors>
HPSL
HPS1 HPS2
HP
Td1 Td2
LP
Ti
EV3 SV2
INV STD1
Tg
EV2
TL
EV1
Tce
Ta
HPSL
HPS1 HPS2
HP
Td1 Td2EV3
SV2
INV STD1
Tg
EV2
TL
EV1
Tce
Ta
HPS3
Td3
SV3
STD2
Ti
Description of Functions and Operation SiENBE28-901
44 Air Cooled Refrigeration Condensing Unit
3) Operation Mode 3
<In case of 3 compressors>
4) Operation Mode 4
<In case of 3 compressors>
HPSL
HPS1 HPS2
HP
Td1 Td2EV3
SV2
INV STD1
Tg
EV2
TL
EV1
Tce
Ta
HPS3
Td3
SV3
STD2
Ti
HPSL
HPS1 HPS2
HP
Td1 Td2EV3
SV2
INV STD1
Tg
EV2
TL
EV1
Tce
Ta
HPS3
Td3
SV3
STD2
Ti
SiENBE28-901 Description of Functions and Operation
Air Cooled Refrigeration Condensing Unit 45
5) Operation Mode 5 (Defective of INV)
<In case of 2 compressors>
<In case of 3 compressors>
HPSL
HPS1 HPS2
HP
Td1 Td2
LP
EV3 SV2
INV STD1
Tg
EV2
TL
EV1
Tce
TaTi
HPSL
HPS1 HPS2
HP
Td1 Td2EV3
SV2
INV STD1
Tg
EV2
TL
EV1
Tce
Ta
HPS3
Td3
SV3
STD2
Ti
Description of Functions and Operation SiENBE28-901
46 Air Cooled Refrigeration Condensing Unit
6) Operation Mode 6 (Defective of INV)
<In case of 3 compressors>
7) Operation Mode 7 (Defective of INV)
<In case of 3 compressors>
HPSL
HPS1 HPS2
HP
Td1 Td2EV3
SV2
INV STD1
Tg
EV2
TL
EV1
Tce
Ta
HPS3
Td3
SV3
STD2
Ti
HPSL
HPS1 HPS2
HP
Td1 Td2EV3
SV2
INV STD1
Tg
EV2
TL
EV1
Tce
Ta
HPS3
Td3
SV3
STD2
Ti
SiENBE28-901 Description of Functions and Operation
Air Cooled Refrigeration Condensing Unit 47
4.2 Outline of Functions
(Input) (Output)Outdoor unit
Low pressure sensor
High pressure sensor
Discharge pipe thermistor
Suction pipe thermistor
Brazed-plate type heat exchangerinlet thermistor
Brazed-plate type heat exchangeroutlet thermistor
Outdoor heat exchanger outlet thermistor
Outdoor air thermistor
High pressure switch
Protection device
Startup control
Thermostat ON/OFF
Compressor control
Outdoor fan control
Electronic expansion valve control
Solenoid valve control
Oil return control
Four way valve control
High pressure protection control
Low pressure protection control
Overheat protection control
STD compressor overcurrent protection control
Earth leakage detection control
Compressor
Electronic expansion valve
Solenoid valve
Outdoor fan motor
Four way valve
Description of Functions and Operation SiENBE28-901
48 Air Cooled Refrigeration Condensing Unit
4.3 Detailed Description of Functions(1) Startup control
The actuators will be operated in the following sequence when the thermostat is turned on:
1 The outdoor fan will start to operate for 5 seconds. (This is intended to measure the outdoor temperature accurately.)
2 At power-up, the operation outputs (P1, P2) for low pressure conditions (see the chart on the right) will be turned on/off.(This is intended to avoid possible liquid compression that is caused by the thermostatic expansion valve in the showcase being fully open during startup. To prevent liquid compression, the liquid solenoid valve will be cycled on and off until the thermostatic expansion valve catches up.)
3 The compressors will be activated.
(2) Thermostat ON/OFF
Thermostat off setting value
Lpm: Lpm1 obtained after an outdoor temperature correction is made.Lpm1: Pressure equivalent to the evaporation temperature set by the dip switches
(Tsd: Evaporation temperature set by the dip switches).LP: The pressure detected by the low pressure sensor (S1NPL)
Inverter compressor
Activation complete
Operation output
Fan
Operation prior to compressor activation
Air flow rate corresponding to the outdoor temperature.
This may be turned on in order to raise LP, depending on outdoor temperature and the thermostat OFF time.
LP>0.49MPa: Operation output OFFLP<0.294MPa:Operation output ON
90sec
15sec52Hz 15sec
56Hz
1 2 3
MTLRMEQ**
LTLRLEQ***
0.1MPa -0.015MPa
Thermostat OFF (Compressor stops.)
Thermostat ON(Compressor starts.)
& or &
&
• LP>Lpm1+0.15MPa• Outdoor temperature Ta < Tsd (the evaporation temperature set by the dip switches)• 3 minutes after the thermostat is turned OFF.• LP>Lpm1• 3 minutes after the thermostat is turned OFF.
• The compressor standby mode before a restart is complete.
• Activation complete.
& • LP < Thermostat off setting value• LP < 0 MPa continuously for 5 seconds
or
SiENBE28-901 Description of Functions and Operation
Air Cooled Refrigeration Condensing Unit 49
Conversion table for using the evaporation temperature (set by the dip switches) to determine its pressure equivalent
DS1Tsd(Lpm1)
DS1Tsd(Lpm1)
LRMEQ** LRLEQ** LRMEQ** LRLEQ**
-10°C(0.47MPa)
-35°C(0.11MPa)
0°C(0.69MPa)
-25°C(0.22MPa)
-20°C(0.29MPa)
-45°C(0.03MPa)
5°C(0.82MPa)
-20°C(0.29MPa)
-15°C(0.37MPa)
-40°C(0.07MPa)
10°C(0.98MPa)
-5°C(0.56MPa)
-30°C(0.16MPa)
ON
OFF1 2 3 4
Factory set
ON
OFF1 2 3 4
ON
OFF1 2 3 4
ON
OFF1 2 3 4
ON
OFF1 2 3 4
ON
OFF1 2 3 4
ON
OFF1 2 3 4
Description of Functions and Operation SiENBE28-901
50 Air Cooled Refrigeration Condensing Unit
(3) Compressor control
Compressor control
Normal capacity control
High compression ratio avoidance control
Differential pressure inversion avoidance control
Oil return control by increasing the compressor frequency
Control using a reduced LP
Droop control using HP
Droop control using Td
Droop control using electrical current & INV
Current limit control
Droop control using INV compressor current
Droop control using INV compressor fin temperature
STD compressor overcurrent protection control
• Increase or decrease the compressor frequency using the low pressure as a controlled variable, in order to achieve the optimum cooling capacity for the target evaporation temperature (Tst). The target evaporation temperature value used will be the one set by the dip switches. (For details, see section 2, "Field Settings").The frequency value will be increased or decreased in steps of 1 every 30 seconds.
• If the low pressure (LP) drops below a pressure equivalent to the target evaporation temperature (Lpm) –0.015 MPa, the compressor speed will be reduced by one step (every 30 seconds).
• If the low pressure (LP) exceeds a pressure equivalent to the target evaporation temperature (Lpm) +0.015 MPa, the compressor speed will be increased by one step (every 30 seconds).
However, the thermostat ON/OFF operation will be performed if the load is low.
• If the compression ratio stays above 25 for 10 seconds or more, the compressor speed will be reduced. (This is intended to protect the compressor scrolls.)
• If the high and low pressure differential is too small, the compressor speed will be increased according to the actual differential pressure. (This is intended to maintain lubrication.)
• See the "Oil return control" section.
• Reduces the number of compressors being operated or the compressor speed, according to the actual low pressure and the speed at which the pressure is reduced.
• When stopping the STD compressor:• Operation mode is not 1, 5 or 7.• Low pressure (LP) < Rapidly dropping LP
&
• When reducing the INV compressor speed:• Operation mode = 1• Low pressure (LP) < LP required for shifting to minimum Hz
&
• Values for rapidly dropping LP and the LP required for shifting to minimum Hz
LRMEQ** LRLEQ**Rapidly dropping LP 0.23MPa 0.02MPaLP required for shifting to minimum Hz 0.20MPa 0.02MPa
• The compressor speed is lowered slightly according to the actual high pressure.High pressure (HP) > 3.23 MPa
• Reduces the compressor speed using the actual discharge thermistor temperature.The discharge pipe temperature (Td) ≥ 115°C for 1 minute or more.
• Control will be performed according to the electrical current setting specified in Setting Mode 2-2, as the upper limit.Note that this setting will reduce the cooling capacity.(For details about setting procedures, see the "Setting Mode 2-2" section)
• Reduces the compressor speed using the inverter actual secondary current.Inverter secondary current setting for activating droop control: 14.7 A
• Reduces the compressor speed according to the actual inverter fin temperature.Inverter fin temperature setting for activating droop control: 84°C
• If any of the following conditions is met, the INV. compressor speed will be reduced.
• The STD electrical current value>12.5 A and HP ≥ 3.28 MPa for 2 seconds.• The STD electrical current value>12 A and HP ≥ 3.28 MPa for 5 seconds.
or
• If any of the following conditions is met, the STD compressor will be stopped.• The STD current value>14.95 A for 2.1 seconds.• The STD current value>13 A for 5 seconds.• The STD current value>12.35 A for 20 seconds.
SiENBE28-901 Description of Functions and Operation
Air Cooled Refrigeration Condensing Unit 51
(3)-1. Compressor steps table
INV step
General step
INV compressor
frequency (Hz) INVstep
General step
INV compressor frequency (Hz) +
the number of STD compressors
INVstep
General step
INV compressor frequency (Hz) +
the number of STD compressors
0 0 0 1 21 52+STD×1 1 41 52+STD×21 1 52 2 22 56+STD×1 2 42 56+STD×22 2 56 3 23 62+STD×1 3 43 62+STD×23 3 62 4 24 68+STD×1 4 44 68+STD×24 4 68 5 25 74+STD×1 5 45 74+STD×25 5 74 6 26 80+STD×1 6 46 80+STD×26 6 80 7 27 88+STD×1 7 47 88+STD×27 7 88 8 28 96+STD×1 8 48 96+STD×28 8 96 8,10,12,
15,20AY19 29 104+STD×1
(15,20AY1)9 49 104+STD×2
9 9 104 10 30 110+STD×1 10 50 110+STD×210 10 110 11 31 116+STD×1 11 51 116+STD×211 11 116 12 32 124+STD×1 12 52 124+STD×212 12 124 13 33 132+STD×1 8AY1 13 53 132+STD×213 13 132 14 34 144+STD×1 14 54 144+STD×214 14 144 15 35 158+STD×1 15 55 158+STD×215 15 158 5AY1 16 36 165+STD×1 16 56 165+STD×216 16 165 17 37 176+STD×1 17 57 176+STD×217 17 176 18 38 188+STD×1 18 58 188+STD×2 15AY118 18 188 19 39 202+STD×1 10AY1 19 59 202+STD×219 19 202 20 40 210+STD×1 20 60 210+STD×220 20 210 21 41 218+STD×1 21 61 218+STD×221 21 218 6AY1 22 42 232+STD×1 12AY1 22 62 232+STD×2 20AY1
Description of Functions and Operation SiENBE28-901
52 Air Cooled Refrigeration Condensing Unit
(4) Fan control(4)-1. Outdoor fan control
The outdoor fan will be controlled using the high pressure as the controlled variable, as shown in the flow below.
(4)-2. Fan control before startupThe fan revolution will be set based on the outdoor temperature. This is intended to prevent the pressure from rising too rapidly and ensure the proper differential pressure.
(4)-3. Outdoor fan residual operationReduces the high pressure to some degree when the thermostat is turned off. This will minimize the amount of sluggish refrigerant that is trapped due to high pressure when the system is stopped.The fan will operate continuously for either 30 seconds after the compressors are turned off, or as long as the high pressure (HP) stays below 1.18 MPa.
(4)-4. Fan upper limit control based on the outdoor temperatureThe fan upper speed will be limited based on the outdoor temperature. This will help reduce the operating sound.
Outdoor fanLpm: Pressure equivalent to the target evaporation temperatureHP: High pressure
or
Fan control
Fan speed-up control
Fan speed-down control
Every 20 to 60 seconds
Every 60 seconds
Increases the speed by 1 tap.
Reduces the speed by 1 tap.
High pressure fan control
INV fin temperature control
• Lpm < 0.59 MPa• HP > 1.86 MPa
<For 5, 6, 15, and 20AY1 models>
&
& • Lpm ≥ 0.59 MPa• HP > Lpm + 1.27 MPa
<For 8, 10, and 12AY1 models>• HP ≥ Lpm + 1.47 MPa
<For 5, 6, 15, and 20AY1 models>
& • HP < Lpm + 0.69 MPa• HP < 1.27 MPa
<For 8, 10, and 12AY1 models>• HP < Lpm + 0.88 MPa
TcL: Saturation temperature equivalent to high pressureTa: Outdoor temperature
• HP ≥ 2.74 MPa ······ Max. fan tap
& • HP ≥ 2.45 MPa• TcL > Ta + 18°C ······· Increases the speed by 2 taps.
& • HP ≥ 2.45 MPa• TcL ≤ Ta + 18°C ······ Increases the speed by 1 tap.
&
• HP ≥ 2.45 MPa• While the outdoor fan is not in operation ······ Increases the speed by
1 tap.(This assumes that the low pressure outdoor fan is being controlled.)
Inverter fin temperature > 79°C ······ Increases the speed by 1 tap.
Outdoor temperature Ta<3°C 3°C≤Ta<9°C
9°C≤Ta<15°C
15°C≤Ta<21°C
21°C≤Ta<28°C Ta≥28°C
LRM(L)EQ5AY1,6AY1 0 2 3 4 5 6LRM(L)EQ8AY1,10AY1,12AY1 0 2 3 4 5 6LRM(L)EQ15AY, 20AY1 0 2 3 4 5 6
Fan tap9 tap
6 or 7 tap
5 or 6 tap
26°C 28°C 31°C 33°CAmb. temp. (°C)
SiENBE28-901 Description of Functions and Operation
Air Cooled Refrigeration Condensing Unit 53
(4)-5. Outdoor fan tap tableLRM(L)EQ5AY1
LRM(L)EQ6AY1
LRM(L)EQ8AY1
LRM(L)EQ10AY1
LRM(L)EQ12AY1
LRM(L)EQ15AY1
LRM(L)EQ20AY1
Fan (Fan tap) 0 1 2 3 4 5 6 7 8 9Outdoor fan (standard mode)Revolution (rpm) 0 285 315 360 450 570 730 800 850 951
Fan (Fan tap) 0 1 2 3 4 5 6 7 8 9Outdoor fan (high static pressure mode) Revolution (rpm) 0 285 315 360 450 570 730 850 1000 1020
Fan (Fan tap) 0 1 2 3 4 5 6 7 8 9Outdoor fan (standard mode)Revolution (rpm) 0 285 315 360 450 570 800 951 1000 1020
Fan (Fan tap) 0 1 2 3 4 5 6 7 8Outdoor fan (high static pressure mode) Revolution (rpm) 0 285 315 360 450 570 800 951 1020
Fan (Fan tap) 0 1 2 3 4 5 6 7 8 9Outdoor fan (standard mode)Revolution (rpm) 0 350 370 400 460 530 630 680 710 760
Fan (Fan tap) 0 1 2 3 4 5 6 7 8 9Outdoor fan (high static pressure mode) Revolution (rpm) 0 350 370 400 460 560 630 680 795 870
Fan (Fan tap) 0 1 2 3 4 5 6 7 8 9Outdoor fan (standard mode)Revolution (rpm) 0 350 370 400 460 530 630 710 760 795
Fan (Fan tap) 0 1 2 3 4 5 6 7 8 9Outdoor fan (high static pressure mode) Revolution (rpm) 0 350 370 400 460 560 630 760 821 870
Fan (Fan tap) 0 1 2 3 4 5 6 7 8 9Outdoor fan (standard mode)Revolution (rpm) 0 350 370 400 460 560 680 795 821 850
Fan (Fan tap) 0 1 2 3 4 5 6 7 8Outdoor fan (high static pressure mode) Revolution (rpm) 0 350 370 400 460 560 680 795 870
Fan (Fan tap) 0 1 2 3 4 5 6 7 8 9
Outdoor fan (standard mode)Revolution (rpm)
0 395 800 460 570 720 800 1050 1136 11860 0 0 395 540 690 770 1020 1106 1156
Fan (Fan tap) 0 1 2 3 4 5 6 7 8
Outdoor fan (high static pressure mode) Revolution (rpm)
0 395 800 460 570 720 800 1136 12350 0 0 395 540 690 770 1106 1205
Fan (Fan tap) 0 1 2 3 4 5 6 7 8 9
Outdoor fan (standard mode)Revolution (rpm)
0 395 800 460 570 800 930 1136 1186 12350 0 0 395 540 770 900 1106 1156 1205
Fan (Fan tap) 0 1 2 3 4 5 6 7 8
Outdoor fan (high static pressure mode) Revolution (rpm)
0 395 800 460 570 800 930 1136 12350 0 0 395 540 770 900 1106 1205
Description of Functions and Operation SiENBE28-901
54 Air Cooled Refrigeration Condensing Unit
(5) Electrical expansion valve control(5)-1. Outdoor electrical expansion valve (Y1E(EV1)) ······ This only applies to the Japanese
domestic models. The valve will be activated when the reverse cycle defrost is used.For the LRM(L)EQ** models, a "0pls" command will be used all times.
(5)-2. Outdoor electrical expansion valve (Y2E(EV2)) ······ This valve will provide refrigerant gas injection flow rate control, overheating protection, and condensation protection.
Initial valve opening: 43pls (mode 1), 55pls (modes other than mode 1)Control flow
(5)-3. Outdoor electronic expansion valve (Y3E(EV3)) ······ An electronic expansion valve is installed in the intermediate injection line of the INV compressor. The valve will operate in synch with the INV compressor, and allow the refrigeration oil to be returned to the INV compressor(s) that are in operation. It also creates an economizer circuit by means of gas injection. In addition, the valve will control the difference in discharge pipe temperatures between INV and STD compressors.
(6) Solenoid valve controlFor 8, 10, 12, 15, and 20 AY1 models, a solenoid valve is installed in the intermediate injection line of the STD compressor. The valve will operate in synch with STD compressor, and allow the refrigeration oil to be returned to the STD compressor(s) that are in operation. Additionally, the valve will create a gas injection economizer circuit.
Outdoor EV2 condensation avoidance control
or
• The discharge pipe temperature thermistor value < 60°C
• Intermediate superheat (SH) <8 to 12K continuously for 20 seconds or more.
Outdoor EV2 normal control
Every 10 seconds Every 20 seconds Outdoor EV2 overheat protection control
or
&• INV compressor continues to
operate for 60 seconds or more• STD compressor continues to
operate for 90 seconds or more.
• Min (discharge pipe SH, forecasted port SH) < 15°C
Every 20 sec.
or• Forecasted port temperature 1 > 110°C• Forecasted port temperature 2 > 130°C• Discharge pipe temperature > 90°C
• Discharge pipe temperature > 80°C
• Discharge pipe temperature ≤ 80°C
Discharge gas temperature control
Intermediate SH control
• The target discharge pipe temperature is controlled to be 90°C.
• Controlled for target intermediate SH(8 to 12°C)
Outdoor EV3 control
Operation of one INV compressor
INV compressor + STD compressor
• EV3: 480pls
• EV3 will be controlled using the difference in discharge pipe temperatures of the INV and STD compressors.43pls ≤ EV3 ≤ 480pls
SiENBE28-901 Description of Functions and Operation
Air Cooled Refrigeration Condensing Unit 55
(7) Oil return controlRecover the refrigeration oil that has been left standing in the system at regular intervals. Recover the oil into the outdoor unit, using a timer and low pressure.
(8) Four way valve controlTo standardize the hardware with the Japanese domestic models, the European models are also equipped with four-way valves.The circulation volume has been factory set to insure that the four-way valve switches over properly. This allows the valve to be initialized to the proper position when the power is turned on.
ON condition: The valve will be activated when the differential pressure at start-up is 0.294 MPa or less.
OFF condition: The differential pressure stays above 0.49 MPa for 10 seconds, or the watchdog timer reaches 90 seconds.(Low, high pressure and discharge gas protection will take priority.)
For 5 and 6 AY1 models, the INV compressor steps will be increased. For the other models, the STD compressors will be operated.
(9) High pressure protection controlIf the following condition is met, the compressor load will be reduced significantly, as shown in the block diagram below.After multiple retries are made and the retry counter is reached, the compressor will stop and declare a problem (abnormal stop). (For details, see the list of errors.)The high-pressure retry code "E3" and the number of retries will be sent to the AIRNET.High pressure sensor>3.479 MPa.
If the high pressure switch (operating pressure: 3.8 MPa) is activated (high pressure sensor reading ≥ 3.567 MPa), the compressor will stop and declare a problem (abnormal stop).To reset, turn off the power switch (or operation switch) and turn it back on again.
Oil return control
Objective:Recovers the refrigeration oil from the evaporator by putting the refrigerant into a wet state by utilizing a delay in response to the mechanical expansion valve. The operation output will be turned on/off using the actual low pressure.
or
Oil return by turning on/off the indoor unit solenoid valve
Oil return by increasing the compressor frequency
Objective:Increases the compressor speed to provide sufficient refrigerant speed in the suction pipe. Then the oil left standing in the suction pipe will be recovered into the outdoor unit.
Normal capacity control
Normal performance control
• Continuous operation time during oil return ≥ 40 minutes
• 90 seconds have passed• Low pressure (LP) ≥ 0.196 MPa
• The circulating volume used for oil return continues to be less than specified for 60 to 120 minutes or more. (*1)
• The circulating volume used for oil return continues to be more than specified for 5 minutes
• Oil return has continued for 10 minutes.
or
Recover the oil by increasing the compressor frequency
Indoor solenoid valve: ON
Indoor solenoid valve: OFF
Recovering the oil by turning on/off the indoor solenoid valve
or
or
• HP<3.04MPa• LP>0.245MPa
• HP<3.04MPa• LP<0.196MPa• 30 seconds have passed.
(*1)Compressor steps
Low load High load
LPHigh
Low Oil return interval: Short
Oil returninterval: Long
Operating mode3, 4 2, 5 1
Stops the STD2 compressor.
Stops the STD1 compressor.
Reduces the INV compressor by 5 steps.
Description of Functions and Operation SiENBE28-901
56 Air Cooled Refrigeration Condensing Unit
(10) Low pressure protection controlIf the pressure drops below 0.00 MPa, the system will cease operation. After 2 to 10 minutes in standby, the system will resume operation. For a period of 3 hours after power-up, the system will continue to check whether the suction stop valve is closed. If the stop valve is seen to be closed, the system will stop and declare a problem (abnormal stop). Three hours after the system was turned on, the system will no longer stop due to an abnormally low pressure.(The low pressure retry code "E4" will be sent to the AIRNET.)
(11) Overheat protection controlIf any of the following conditions is met, the system will cease operation. INV compressors will resume operation after 2 to 6 minutes in standby, while STD compressors will restart after 3 to 10 minutes. If a particular compressor repeats this procedure 10 times, "F3" will be sent to the AIRNET; if it repeats it 15 times, the compressor will stop.For 5 and 6AY1 models, the compressors will stop and declare a problem (abnormal stop). For 8, 10, 12, 15, and 20AY1 models, the remaining compressors will perform a backup operation.
If the following condition is met, the relevant compressor will stop immediately and declare a problem (abnormal stop).The discharge gas temperature ≥150°C.
(12) STD compressor overcurrent protection controlThe following condition is met, the system will stop operation. STD compressors will resume operation after 30 minutes in standby. If a compressor repeats this procedure twice, "E0" will be sent to the AIRNET. If it repeats it three times, the relevant compressor will stop.The STD compressor current >14.95A for 2.1 seconds or more.
(13) Earth leakage detection control1. Detection using a earth leakage detection board
If the high-pressure sensor reading exceeds 3.567 MPa, the earth leakage detector PCB will be activated. Then the compressor operation will stop and declare a problem (abnormal stop).To reset, turn off the power switch (or operation switch) and turn it back on again.
2. Detection during initial power-upThe system will check for earth leakage while the compressor is running for the first 10 seconds after power-up. A compressor will stop abnormally if the power breaker is turned off or the earth leakage detector PCB is activated during the 10-second period describe above. If the breaker is turned off, turn the breaker on again. If the same thing happens again, disable the defective compressor and perform a backup operation using the remaining compressors.With the operation switch in OFF, reset the system by turning on the power off and then back on again.
or• The discharge gas temperature >120°C for 70 seconds.• The discharge gas temperature >125°C for 30 seconds.• The discharge gas temperature >130°C
SiENBE28-901 Test Operation
Air Cooled Refrigeration Condensing Unit 57
5. Test Operation5.1 Refrigerant Piping
[REFRIGERANT]This System use R410A refrigerant.
Caution This unit is already filled with a certain amount of R410A.Never open liquid and gas shutoff valve until the step Specified in “5.4. CHECKS AFTER WORK COMPLETION”.
The refrigerant R410A requires strict cautions for keeping the system clean, dry and tight.Read this chapter carefully and follow these procedures correctly.A.Clean and dry
Foreign materials (including mineral oils such as SUNISO oil or moisture) should be prevented from getting mixed into the system.
B.TightTake care to keep the system tight when installing.R410A does not contain any chlorine, does not destroy the ozone layer, and does not reduce the earth’s protection against harmful ultraviolet radiation.R410A can contribute slightly to the greenhouse effect if it is released.
Since R410A is a mixed refrigerant, the required additional refrigerant must be charged in its liquid state. If the refrigerant is charged in a state of gas, its composition changes and the system will not work properly.Be sure to perform refrigerant replenishment. Refer to “5.4 CHECKS AFTER WORK COMPLETION” and the label of instructions on refrigerant replenishment on the cover surface of the control box,
[Important information regarding the refrigerant used]This product contains fluorinated greenhouse gases covered by the Kyoto Protocol. Do not vent gases into the atmosphere.Refrigerant type : R410AGWP(1) value : 2090(1)GWP = global warming potentialPlease fill in with indelible ink,
1 the factory refrigerant charge of the product,2 the additional refrigerant amount charged in the field and1 + 2 the total refrigerant charge
on the refrigerant charge label supplied with the product.The filled out label must be adhered in the proximity of the product charging port (e.g. onto the inside of the service cover).
[DESIGN PRESSURE]Since design pressure is 3.8MPa or 38bar (for R407C units : 3.3MPa or 33bar), the wall thickness of pipes should be more carefully selected in accordance with the relevant local and national regulations.
Contains fluorinated greenhouse gases covered by the Kyoto Protocol
(2)(1)
(1)=
(2)=
(1)+(2)=
6 5
4
1
2
3
kg
kg
kg
R410A1 factory refrigerant charge
of the product : see unit name plate
2 additional refrigerant amount charged in the field
3 total refrigerant charge
4 Contains fluorinated greenhouse gases covered by the Kyoto Protocol
5 outdoor unit
6 refrigerant cylinder and manifold for charging
Test Operation SiENBE28-901
58 Air Cooled Refrigeration Condensing Unit
5.1.1 To Piping Work ContractorsNever open the shutoff valve until the steps specified in “5.2 FIELD WIRING” and “5.3.3Checking of device and installation conditions” of piping.Do not use flux at the time of brazing and connecting refrigerant pipes. Use phosphorous copper brazing filler metal (BCuP-2), which does not require flux. Chlorine-based flux causes piping corrosion. Furthermore, if fluoride is contained, the flux will have adverse influences on the refrigerant piping line, such as the deterioration of refrigerating machine oil.
Caution All field piping must be installed by a licensed refrigeration technician and must comply with relevant local and national regulations.
[Precautions for reuse of existing refrigerant piping / heat exchangers]
Keep the following points in mind for the reuse of existing refrigerant piping / heat exchangers.A malfunction may result if there is deficiency.
Do not use the existing piping in the following cases. Perform new piping instead.• The piping is different in size.• The strength of the piping is insufficient.• The compressor of the condensing unit previously used caused a malfunction.
An adverse influence of residual substances, such as the oxidation of refrigerant oil and the generation of scale, is considered.
• If the indoor unit or outdoor unit is disconnected from the piping for a long time.The intrusion of water and dust into the piping is considered.
• The copper pipe is corroded.• The refrigerant of the condensing unit previously used was other than R410A (e.g., R404A /
R507 or R407C). The contamination of the refrigerant with heterogeneity is considered.
If there are welded connections midway on the local piping, make gas leakage checks on the welded connections.Be sure to insulate the connection piping.The liquid and gas pipe temperatures are as follows:Liquid pipe arrival minimum temperature: 0°CGas pipe arrival minimum temperature: –26°C (Refrigeration Series)–46°C (Freezer Series)In the case of thickness insufficiency, add additional insulation material or renew the existing insulation material.Renew the insulation material if the insulation material is degraded.
Keep the following points in mind for the reuse of existing heat exchangersUnits with insufficient design pressure (since this product is an R410A unit) require a lower-stage design pressure of 2.5 MPa [25 bars].Units for which the path to the heat exchanger has been routed so that the flow of refrigerant is from bottom to topUnits with copper tubing or fan corrosionUnits that may be contaminated with foreign matter such as rubbish or other dirt
SiENBE28-901 Test Operation
Air Cooled Refrigeration Condensing Unit 59
5.1.2 Selection of Piping MaterialMake sure that the inner side and outer side of the piping used is clean and free of contaminants, such as sulphur, oxide, dust, chips, oil and fat, and water.It is desirable that the maximum oil adhesion in the piping is 30 mg per 10 m.Use the following type of refrigerant piping.Material: Seamless phosphorus deoxidized copper tube (C1220T-O for a maximum outer
diameter of 15.9 mm and C1220T-1/2H for a minimum outer diameter of 19.1 mm)Refrigerant piping size and wall thickness: Decide the size and thickness from the following table.(This product uses R410A. The withstand pressure of O type may be insufficient if it is used for piping with a minimum diameter of 19.1 mm. Therefore, be sure to use 1/2 H type with a minimum thickness of 1.0 mm.If O type is used for piping with a minimum diameter of 19.1 mm, a minimum thickness of 1.2 mm will be required. In that case, be sure to perform the blazing of each joint.)
Be sure to perform piping work within the range specified in the following table.Refrigerant piping length
Max. permissible one-way piping length(equivalent length)
LRMEQ5~20AY1 a + b + c + d ≤ 130m (d is d1 or d2 or e, f whichever is longer)
LRLEQ5~20AY1 a + b + c + d ≤ 70m (d is d1 or d2 whichever is longer)
Max. branch piping length (actual length) b + c + d ≤ 30m (d is d1 or d2 whichever is longer)
Max. difference in height between indoor and outdoor units
unit below outdoor unit H ≤ 35m (Note)
unit above outdoor unit H ≤ 10m
Difference in height between indoor units H1 ≤ 5m
Note: A trap is required at 5 m intervals from outdoor unit.
Refrigerant piping size(MT (Medium Temperature)) LRMEQ5~20AY1 (Unit : mm)
Outdoor unit sidePiping sizeLiquid pipe Gas pipe50m or less 50~130m 50m or less 50~130m
5A · 6A type φ9.5 × 0.8 (O type) φ12.7 × 0.8 (O type) φ19.1 × 1.0 (1/2H type) φ22.2 × 1.0 (1/2H type)8A · 10A · 12A type φ9.5 × 0.8 (O type) φ12.7 × 0.8 (O type) φ25.4 × 1.0 (1/2H type) φ28.6 × 1.0 (1/2H type)15A · 20A type φ12.7 × 0.8 (O type) φ15.9 × 1.0 (O type) φ31.8 × 1.1 (1/2H type) φ34.9 × 1.1 (1/2H type)Piping between branching areas(B, b, C, c)
Select the piping from the following table in accordance with the total capacity of indoor units connected downstream.
No size after branching can exceed the size of any upstream piping.Piping between branching areas and each unit Adjust the size of the piping so that it will coincide with the size of piping connecting to the indoor unit.(LT (Low Temperature)) LRLEQ5~20AY1 (Unit : mm)
Outdoor unit sidePiping sizeLiquid pipe Gas pipe50m or less 50~70m 25m or less 25~70mm
5A · 6A type φ9.5 × 0.8 (O type) φ12.7 × 0.8 (O type) φ19.1 × 1.0 (1/2H type) φ22.2 × 1.0 (1/2H type)8A · 10A · 12A type φ9.5 × 0.8 (O type) φ12.7 × 0.8 (O type) φ25.4 × 1.0 (1/2H type) φ28.6 × 1.0 (1/2H type)15A · 20A type φ12.7 × 0.8 (O type) φ15.9 × 1.0 (O type) φ31.8 × 1.1 (1/2H type) φ34.9 × 1.1 (1/2H type)Piping between branching areas(B, b, C, c)
Select the piping from the following table in accordance with the total capacity of indoor units connected downstream.
No size after branching can exceed the size of any upstream piping.Piping between branching areas and each unit Adjust the size of the piping so that it will coincide with the size of piping connecting to the indoor unit.
H
Outdoor unit
Liquid piping
Gas
pip
ing A B C D2
F E D1
ShowcaseH1 Unit
coolerf e d1
a b c d2
Total capacity of indoor units after branching Gas pipe size Liquid pipe sizeLess than 6.0 kW φ12.7 × 0.8 (O type) φ6.4 × 0.8 (O type)6.0 kW or over and less than 9.9 kW φ15.9 × 1.0 (O type)
φ9.5 × 0.8 (O type)9.9 kW or over and less than 14.5 kW φ19.1 × 1.0 (1/2H type)14.5 kW or over and less than 18.5 kW φ22.2 × 1.0 (1/2H type)18.5 kW or over and less than 25.0 kW φ25.4 × 1.0 (1/2H type)25.0 kW or over and less than 31.0 kW φ28.6 × 1.0 (1/2H type)
φ12.7 × 0.8 (O type)31.0 kW or over φ31.8 × 1.1 (1/2H type)
Total capacity of indoor units after branching Gas pipe size Liquid pipe sizeLess than 2.3 kW φ12.7 × 0.8 (O type) φ6.4 × 0.8 (O type)2.3 kW or over and less than 4.4 kW φ15.9 × 1.0 (O type)
φ9.5 × 0.8 (O type)4.4 kW or over and less than 6.4 kW φ19.1 × 1.0 (1/2H type)6.4 kW or over and less than 7.8 kW φ22.2 × 1.0 (1/2H type)7.8 kW or over and less than 10.8 kW φ25.4 × 1.0 (1/2H type)10.8 kW or over and less than 13.4 kW φ28.6 × 1.0 (1/2H type)
φ12.7 × 0.8 (O type)13.4 kW or over φ31.8 × 1.1 (1/2H type)
Test Operation SiENBE28-901
60 Air Cooled Refrigeration Condensing Unit
5.1.3 Drier Installation
Caution This product requires that a drier be installed on liquid piping on site.(Operating the unit without a drier installed may result in equipment failure.)
Select a drier from the following chart:
Install the drier in a horizontal orientation wherever possible.Install the drier as close to the outdoor unit as possible.Remove the drier cap immediately before brazing (to prevent absorption of airborne moisture).Follow instructions in the drier instruction manual concerning drier brazing.Repair any burning of drier paint that occurs during drier brazing. Contact the manufacturer for more information about paint for repair use.Flow direction is specified for some type of the dryer.Set the flow direction according to the operation manual of the dryer.
5.1.4 Operation Method of Shutoff ValvesFollow the instructions below when operating each shutoff valve.
Caution Do not open the shutoff valve until the steps specified in “5.3.3 Checking of device and installation conditions” is completed.Do not leave the shutoff valve opened without turning the power on, otherwise refrigerant may be condensed in the compressor and the insulation of the main power supply circuit may be degraded.Be sure to use an exclusive tool to handle the shutoff valve. The shutoff valve is not of back sheet type. Excessive force imposed may break the valve.Use a charge hose when using the service port.Make sure that there is no refrigerant gas leakage after the valve cover and cap are securely tightened.
Tightening torqueCheck with the following table the sizes of shutoff valves incorporated by each model and the tightening torque values of the respective shutoff valves.
Shutoff valve sizes
Model Required dryer core (recommended type)
LRMEQ5AY1, LRLEQ5AY1LRMEQ6AY1, LRLEQ6AY1
80g (100% molecular sieve equivalent)(DML083/DML083S : Danfoss made)
LRMEQ8AY1, LRLEQ8AY1LRMEQ10AY1, LRLEQ10AY1LRMEQ12AY1, LRLEQ12AY1
160g (100% molecular sieve equivalent)(DML163/DML163S : Danfoss made)
LRMEQ15AY1, LRLEQ15AY1LRMEQ20AY1, LRLEQ20AY1
160g (100% molecular sieve equivalent)(DML164/DML164S : Danfoss made)
5A type 6A type 8A type 10A type 12A type 15A type 20A type
Liquid side shutoff valve φ9.5 φ12.7
Gas side shutoff valve φ19.1 φ25.4 φ31.8
Service port
Valve cover
Shaft
Hexagon holeSealing part
SiENBE28-901 Test Operation
Air Cooled Refrigeration Condensing Unit 61
Opening method1. Remove the valve cover and turn the shaft anticlockwise with a hexagon wrench.2. Turn the shaft until the shaft stops.3. Tighten the valve cover securely. Refer to the above table for the tightening torque
according to the size.
Closing method1. Remove the valve cover and turn the shaft clockwise with a hexagon wrench.2. Tighten the shaft until the shaft comes in contact with the sealing part of the valve.3. Tighten the valve cover securely. Refer to the above table for the tightening torque
according to the size.
Handling Precautions for Valve CoverBe careful not to damage the sealing part.At the time of mounting the valve cover, apply a screw lock agent to the screw thread.Do not apply a screw lock agent (for flare nut use) to the sealing part.Be sure to tighten the valve cover securely after operating the valve. Refer to “OperationMethod of Shutoff Valves” for the tightening torque of the valve.
Handling Precautions for Service PortWork on the service port with a charge hose provided with a pushing rod.At the time of mounting the cap, apply a screw lock agent to the screw thread.Do not apply a screw lock agent (for flare nut use) to the sealing part.Be sure to tighten the cap securely after the work. Refer to “Operation Method of Shutoff Valves” for the tightening torque of the cap.
Shutoff valve sizes
Tightening torque N•m (closes clockwise)
Shaft (valve body) Valve cover Service port
φ9.5 5.4~6.5 Hexagon wrench: 4mm
13.5~16.5
11.5~13.9
φ12.7 8.1~9.9 18.0~22.0
φ19.127.0~33.0 Hexagon wrench:
8mm 22.5~27.5φ25.4
φ31.8 26.5~29.4 Hexagon wrench: 10mm 44.1~53.9
Screw threadApply a screw lock agent
Shutoff valvePart of mounting the valve cover.
Valve cover
Sealing partNot apply a screw lock agent
Sealing partNot apply a screw lock agent
Cap
Screw threadApply a screw lock agent
Test Operation SiENBE28-901
62 Air Cooled Refrigeration Condensing Unit
5.1.5 Precautions for PipingPerform piping branching with the following conditions kept in mind.
At the time of branching the liquid piping, use a T-joint or Y-joint and branch it horizontally. This will prevent an uneven flow of refrigerant.At the time of branching gas piping, use a T-joint and branch it so that the branched piping will be located above the main piping (see the illustration below). This will prevent the stay of refrigerant oil in the indoor unit not in operation.Use a Y-joint for the liquid refrigerant branch and have the piping branch horizontally.
Use a T-joint for the gas refrigerant branch and connect from the top of the main piping.
Make sure that the horizontal portion of the gas piping slants downward to the outdoor unit (see the illustration above).If the outdoor unit is located above, make a trap on the gas pipe at 5 m intervals from outdoor unit. This will ensure the smooth returning of oil in the piping slanting upward.
Y-joint
A
Horizontal surface
±30° or less
A-arrow view
T-joint
Main piping
Indoor unit side
Branch piping
T-joint
Make the piping slant downward
Branch pipingMake the piping slant downward
Main pipingMake the piping slant downward
Outdoor unit side
SiENBE28-901 Test Operation
Air Cooled Refrigeration Condensing Unit 63
5.2 Field Wiring5.2.1 Procedure for Power Supply Wiring
Procedure for Power Supply Wiring1 Power supply (3φ 380~415)2 Branch switch or overcurrent circuit breaker
(earth leakage circuit breaker)3 Earth wire4 Power supply terminal block5 Mount insulation sleeves6 Fix the power supply wiring for phases L1, L2, L3,
and N, respectively, with the provided clamp (1) to the resin clamp.
7 Fix the earth wire to the power supply wire (phase N) with the provided clamp (1).
8 Earth wirePerform wiring so that the earth wire will not come in contact with lead wires of the compressor. Otherwise, noise generated may have a bad influence on other equipment.
9 Ground terminal10 • When two wires are connected to a single
terminal, connect them so that the rear sides of the crimp contacts face each other.
• Also, make sure the thinner wire is on top, securing the two wires simultaneously to the resin hook using the accessory clamp (1).
Power circuit, safety device, and cable requirementsA power circuit (see the following table) must be provided for connection of the unit. This circuit must be protected with the required safety devices, i.e. a main switch, a slow blow fuse on each phase and an earth leakage circuit breaker.When using residual current operated circuit breakers, be sure to use a high-speed type (1 second or less) 200mA rated residual operating current.Use copper conductors only.Use insulated wire for the power cord.Select the power supply cable type and size in accordance with relevant local and national regulations.Specifications for local wiring are in compliance with IEC60245.Use wire type H05VV when protected pipes are used.Use wire type H07RN-F when protected pipes are not used.
Phase and frequency Voltage Minimum circuit amp. Recommended fusesLRMEQ5AY1LRLEQ5AY1 φ3, 50Hz 380-415V 12.7A 15A
LRMEQ6AY1LRLEQ6AY1 φ3, 50Hz 380-415V 13.6A 15A
LRMEQ8AY1LRLEQ8AY1 φ3, 50Hz 380-415V 19.2A 25A
LRMEQ10AY1LRLEQ10AY1 φ3, 50Hz 380-415V 21.9A 25A
LRMEQ12AY1LRLEQ12AY1 φ3, 50Hz 380-415V 23.9A 25A
LRMEQ15AY1LRLEQ15AY1 φ3, 50Hz 380-415V 31.2A 40A
LRMEQ20AY1LRLEQ20AY1 φ3, 50Hz 380-415V 34.8A 40A
12
B
3
54
6
10 98
L1
7
L2 L3 N
Terminal block Crip style terminalClamp (1)
Wire: narrowWire: thick
Resin hook
Test Operation SiENBE28-901
64 Air Cooled Refrigeration Condensing Unit
Point for attention regarding quality of the public electric power supplyThis equipment complies with respectively:
EN/IEC61000-3-11(1) provided that the system impedance Zsys is less than or equal to ZmaxandEN/IEC61000-3-12(2) provided that the short-circuit power Ssc is greater than or equal to the minimum Ssc value
at the interface point between the user’s supply and the public system. It is the responsibility of the installer or user of the equipment to ensure. by consultation with the distribution network operator if necessary, that the equipment is connected only to a supply with respectively:
Zsys less than or equal to Zmax andSsc greater than or equal to the minimum Ssc value.
(1) European/International Technical Standard setting the limits for voltage changes.Voltage fluctuations and flicker in public low-voltage supply systems for equipment with rated current ≤ 75A
(2) European/International Technical Standard setting the limits for harmonic currents produced by equipment connected to public low-voltage systems with input current > 16A and ≤ 75A per phase.
Warning, alarm, and operation output wiring connectionsConnect warning, alarm, and operation output wiring to the X2M terminal block and clamp as indicated by the following diagram:
X2M wire specifications
Zmax (Ω) minimum Ssc valueLRMEQ5AY1LRLEQ5AY1 – –
LRMEQ6AY1LRLEQ6AY1 – –
LRMEQ8AY1LRLEQ8AY1 0.27 652kVA
LRMEQ10AY1LRLEQ10AY1 0.27 896kVA
LRMEQ12AY1LRLEQ12AY1 0.27 1093kVA
LRMEQ15AY1LRLEQ15AY1 0.24 757kVA
LRMEQ20AY1LRLEQ20AY1 0.24 941kVA
Electric wire thickness 0.75~1.25mm2
Max. wiring length 130m
Mount insulation sleeves
Fix the wiring with the provided clamp (1)
X2M
C C1 W1 P1 P2
SiENBE28-901 Test Operation
Air Cooled Refrigeration Condensing Unit 65
Remote operating switch wiring connectionsWhen installing a remote operating switch, clamp as indicated by the following diagram:
X3M wire specifications
Caution For Remote switch, use non-voltage contact for microcurrent (not more than 1mA, 12VDC)If the remote operating switch will be used to start and stop the unit, set the operating switch to “REMOTE”.
Electric wire thickness 0.75~1.25mm2
Max. wiring length 130m
X3M
Secure remote operating switch wiring to the resin block using a clamp (field supply).1 2
Test Operation SiENBE28-901
66 Air Cooled Refrigeration Condensing Unit
5.3 Inspection and Pipe InsulationFor piping work contractor, electrical work contractor, and trial run workers
Never open the shutoff valve until the insulation measurement of the main power supply circuit is finished. The measured insulation value will become lower if the measurement is made with the shutoff valve opened.On completion of inspection and refrigerant charging, open the shutoff valve. The compressor will malfunction if the condensing unit is operated with the shutoff valve closed.
5.3.1 Air tight Test/Vacuum Drying
Refrigerant is enclosed in the unit.Be sure to keep both liquid and gas shutoff valves closed at the time of an airtight test or vacuum drying of the local piping.
[For piping work contractor]On completion of piping work, make the following inspection precisely.
To ensure that the condensing unit withstand pressure properly and prevent the penetration of foreign substances, be sure to use R410A-dedicated tools.
Air tightPressurize the high-pressure section of the system (liquid piping) to 3.8 MPa (38 bar) and the low-pressure section of the system (gas piping) to the design pressure (*1) of the indoor unit (field supply) from the service port (*2) (do not exceed the design pressure). The system is considered to have passed if there is no decrease in the pressure over a period of 24 hours.If there is a decrease in the pressure, check for and repair leaks.Vacuum dryingConnect a vacuum pump to the service ports (*) of both the liquid and gas pipes for at least 2 hours and vacuum the unit down to –100.7 kPa or below. Then leave the unit for at least 1 hour at a pressure of –100.7 kPa or below and check that the vacuum gage reading will not rise. If the pressure rises, there is residual water in the system or the system has leakage.
*1 Contact the manufacturer in advance for more information about the design pressure of the indoor unit (field supply).
*2 Refer to the instruction label on the front panel of the outdoor unit (below) for the position of the service port.
Gauge manifoldCharge hose
To ensure that the condensing unit withstand pressure properly and prevent the penetration of foreign substances (water, dirt, and dust), use an R410A-dedicated gage manifold and charge hose. R410A-dedicated tools and R407C-dedicated tools are different in screw specification.
Vacuum pumpPay the utmost attention so that the pump oil will not flow backward into the system while the pump is not in operation.Use a vacuum pump that can vacuum down to –100.7kPa (5 Torr or –755mmHg).
Gas for airtight test use Nitrogen gas
Position of instruction label
Label
SiENBE28-901 Test Operation
Air Cooled Refrigeration Condensing Unit 67
Caution Conduct an airtight test and vacuum drying precisely through the service ports of both liquid and gas shutoff valves.Use charge hoses (provided with a pushing rod each) when using the service ports.
In case of possible water intrusion into pipingPerform the above mentioned vacuum drying for 2 hours first in the following cases:The product is installed in the rainy season, there is a fear of dew condensation resulting in the piping because the installation work period is long, or there is a fear of rainwater intrusion into the piping for other reasons.Then impose a pressure of up to 0.05 MPa with nitrogen gas (for vacuum destruction) and vacuum the unit down to –100.7 kPa or below for 1 hour with a vacuum pump (for vacuum drying).Repeat vacuum destruction and vacuum drying if the pressure does not reach –100.7 kPa or below after a minimum of 2 hours’ vacuuming. Leave the vacuum state for 1 hour then, and check that the vacuum gauge reading will not rise.
5.3.2 Thermal Insulation WorkBe sure to perform thermal insulation of the piping after the airtight test and vacuum drying.Be sure to perform the thermal insulation of the liquid and gas pipes in the connecting piping. Otherwise, water leakage may result.Be sure to insulate liquid and gas connection piping. Failure to do so may result in water leakage. Consult the following chart as a general guide when selecting the insulation thickness.Liquid pipe arrival minimum temperature –10°CGas pipe arrival minimum temperature
–20°C (MT (Medium Temperature))–40°C (LT (Low Temperature))
Reinforce the insulation material for the refrigerant piping according to the environment of thermal installation. Otherwise, the surface of the insulation material may result in dew condensation.If the dew condensation water on the shutoff valves is likely to flow to the indoor unit side through the clearance between the insulation material and piping because the outdoor unit is installed above the indoor unit or for some other reasons, perform appropriate treatment such as the caulking of the joints (see the illustrations below).Attach the cover of the piping outlet with a knock hole opened. If there is a feature of small animals intruding through the piping outlet, cover the piping outlet with a blocking material (field supply) on completion of the steps of “5.5 Additional Refrigerant Charge” (see the illustrations below).Use the piping outlet for jobs required during the steps of “5.5 Additional Refrigerant Charge” (e.g., a job of taking in the charge hose).
Gas side shutoff valve
Pressure-reducing valveCharge hose
(with
sip
hon)
ValveR410A
Tank
Nitro
gen
Used for refrigerant replenishment
Meter
Connection procedure for gauge manifold and vacuum pump
Note: Field pipings
Vacuum pump
Shutoff valve service port
Liquid side shutoff valve
Outdoor unitTo indoor unit
Test Operation SiENBE28-901
68 Air Cooled Refrigeration Condensing Unit
Note: After knocking out the holes, we recommend you remove burrs in the knock holes and paint the edges and areas around the edges using the repair paint.
5.3.3 Checking of Device and Installation ConditionsBe sure to check the followings.
<For those doing electrical work>1. Make sure there is no faulty power wiring or loosing of a nut.
See “5.2.1 Procedure for Power Supply Wiring”.2. Has the insulation of the main power circuit deteriorated?
Measure the insulation and check the insulation is above regular value in accordance with relevant local and national regulations.
<For those doing pipe work>1. Make sure piping size is correct.
See “5.1.2 Selection of Piping Material”.2. Make sure insulation work is done.
See “5.3.2 Thermal Insulation Work”.3. Make sure there is no faulty refrigerant piping.
See “5.1. REFRIGERANT PIPING”.
Liquid side shutoff valve
Gas side shutoff valve
Indoor/Outdoor interunit piping
Coking, etc.
Insulation material
Piping lead-out hole lid
Open a knock hole at
Block
Gas side piping
Liquid side piping
SiENBE28-901 Test Operation
Air Cooled Refrigeration Condensing Unit 69
5.4 Checks after Work CompletionMake sure the following works are complete in accordance with the installation manual.• Piping work• Wiring work• Air tight test/Vacuum drying• Installation work for indoor unit
5.5 Additional Refrigerant ChargeFor refrigerant filling contractorUse R410A for refrigerant replenishment.The R410A refrigerant cylinder is painted with a pink belt.
Warning Electric Shock Warning
Securely close the control box lid before turning power on.Before turning power on, check through the inspection hole (on the left-hand side) of the control box lid that the RUN switch is set to OFF.If the RUN switch is set to ON, the fan may rotate.Check the LED indicators on the PCB (A1P) of the outdoor unit through the inspection hole (on the right-hand side) of the control box lid after the outdoor unit is turned on (see the illustration).(The compressor will not operate for approximately 2 minutes after the outdoor unit is turned on.H2P blinks for the first five seconds when the power supply is turned on. If the equipment is normal, H2P will be turned off in five seconds. H2P lights for abnormality.)
Warning Use protective gear (e.g., protective gloves and glasses) at the time of refrigerant filling.Pay attention to the rotation of the fan whenever the front panel is opened while working.The fan can rotate continuously for a while after the outdoor unit stops operating.
Inspection hole (right-hand side) (upper right-hand side of control box)
Control box lidLift up this tab and open the cover.LED
(H1~8P)
Inspection hole cover
Inspection hole (right-hand side)
RUN switch (factory set: OFF)
Inspection hole (left-hand side)
Control box
Inspection hole (left-hand side) (upper left-hand side of control box)
REMOTE OFF ON
Test Operation SiENBE28-901
70 Air Cooled Refrigeration Condensing Unit
[Additional Refrigerant Charge]
Caution Refer to the Operation Method of Shutoff Valves for the control method of the shutoff valves.Never charge liquid refrigerant directly from a gas line. Liquid compression may cause the compressor to fail.
1. The refrigerant must be noted for this product. Calculate the amount of additional refrigerant charge according to the label for the calculation of the amount of additional refrigerant charge.
2. Take the following procedure for additional refrigerant charge.Refer to “5.3.1 Airtight Test/Vacuum Drying” for the connection of the refrigerant cylinder.
(1) Turn on the indoor unit and control panel.Do not turn on the outdoor unit.
(2) Charge additional refrigerant from the service port of the shutoff valve on the liquid side.(3) If the calculated amount of refrigerant cannot be filled, take the following steps to operate the
system and continue additional refrigerant charge.a. Open the gas shutoff valve all the way and adjust the opening of the liquid shutoff valve
(*1).b. [Warning/Electric Shock Warning]
Turn on the outdoor unit.c. [Warning/Electric Shock Warning]
Turn on the RUN switch of the outdoor unit and replenish refrigerant while the outdoor unit is in operation.
d. Turn off the RUN switch of the outdoor unit after the specified amount of refrigerant is replenished.
e. [Caution]Fully open the shutoff valves on the gas and liquid sides promptly. Otherwise, a piping explosion may result from liquid sealing.
*1 The cylinder’s internal pressure will drop when there is little refrigerant remaining in the cylinder, making it impossible to charge the unit, even if the liquid shutoff valve opening is adjusted. In this situation, replace the cylinder with one that has more refrigerant remaining.Additionally, if the piping length is long, additional charging while the liquid shutoff valve is fully closed may lead to activation of the protection system, causing the unit to stop operation.
1. After the work is completed, apply a screw lock agent (for flare nuts) to the screws of the shutoff valves and service ports.
2. After the additional refrigerant charge is completed, fill out the item “total amount of additional refrigerant charge” on the label of instructions on additional refrigerant charge of the outdoor unit with the actual amount of additional refrigerant charge.Refer to the illustration of the label pasting position for instructions on additional refrigerant charge (see the illustration on the above).
Control box
Label of instructions on additional refrigerant charge
Label pasting position
SiENBE28-901 Test Operation
Air Cooled Refrigeration Condensing Unit 71
[Precautions for refrigerant cylinder]At the time of refrigerant filling, check whether the siphon tube is provided. Then locate the cylinder so that the refrigerant will be filled in the state of liquid (see table below).R410A is a mixed refrigerant, the composition of which may change and the normal operation of the system may not be possible if the refrigerant is filled in the state of gas.
[Check through sight glass]
Caution Fully open the shutoff valves on the liquid and gas sides after the additional refrigerant charge is finished.The compressor will malfunction if the system is operated with the shutoff valves closed.Apply a screw lock agent to the screws of the valve cover mounting parts and service ports.(Otherwise, dew condensation water will intrude and freeze inside and cause cap deformation or damage, which may result in refrigerant gas leakage or compressor malfunctions.)
5.6 Test RunFor test run operatorsDo not operate the outdoor unit alone on a trial basis.
Test run procedureUse the following procedure to perform a test run after installation work is complete for the entire system:1. Fully open the shutoff valves on the gas and liquid sides of the outdoor unit.2. Set the RUN switch of the outdoor switch to ON.
Note: Before turning power on, check that the piping cover and control box lid of the outdoor unit are closed.
3. Check the sealing condition of the outdoor unit through the sight glass. Make sure that the amount of refrigerant is sufficient.
4. Make sure that cold air blows from the indoor unit.Check that the internal temperature is dropping.(Check that the temperature will drop and reach the set temperature in the internal unit. It will take approximately 40 minutes for the interior temperature of the internal unit to reach –20°C.)Check that the indoor unit (for refrigeration or freezing) goes into defrosting operation.
5. Turn power off with the RUN switch of the outdoor unit set to OFF.(Stopping unit operation by disconnecting the power supply directly is dangerous. When the unit is stopped in this manner, its power outage compensation function may cause it to resume operation as soon as the power supply is reactivated. Additionally, stopping the unit in this manner may cause the compressor to fail).
Cylinder provided with siphon tube.
Other cylinders
Stand the cylinder upright and fill the refrigerant.(There is a siphon tube inside, which makes it possible to replenish the refrigerant in the state of liquid without setting the cylinder upside down.)
Stand the cylinder upside down and fill the refrigerant.(Pay attention so that the cylinder will not topple down.)
Full of liquid A little foam flows.
Sealing state
Foam always comes out.
Refrigerant insufficiency
Sight glass
Test Operation SiENBE28-901
72 Air Cooled Refrigeration Condensing Unit
Error diagnosisIf the system cannot operate normal at the time of test run (i.e., the H2P indicator is lit), check with malfunction code on the system with the pushbutton switches on the PCB of the outdoor unit, and take the following steps.Make checks on other malfunction codes and pushbutton switches by referring to the provided Technical Guide.
h OFF k ON l BLINK*1Set the operating switch to the “OFF” position to reset the power supply and then return the switch to the “ON” position to restart the unit. If the problem persists, refer to the Service Manual.
Caution Do not disconnect the power supply for 1 minute after setting the operating switch to “ON”.Electric leak detection is performed for several seconds after the operating switch is set to “ON” and each compressor starts operating, so disconnecting the power supply during that time will result in a false detection.
LED indicationInstallation
failure Remedy(BS3 switch pressed once) (BS2 switch pressed once)H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P
l h k h h l l
l k h h h l l The shutoff valves were left closed.
Fully open the shutoff valves.or
l k h h l h h
l h k h l l l l k h h l h h The passage of air is blocked.
Remove obstacles that block the passage of air.
l h k l h h l l k h h h h l Reverse-phase wiring of power supply
Exchange two wires out of the three power supply wires.
l h k l h h l l k h h h l hVoltage drop Make a voltage
drop check.l h k h l l l l k h l h h l
l h k h h l l l k h h h l h Electric leak See *1 below.
l h k h l l l l k h l l h hOpen L2 phase Verify power
supply wiring connections.
l h k h l h h l k h h h l l
Normal monitor (HAP) LED off. Open L1 phase
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 73
6. Troubleshooting6.1 Checking Points at Servicing
Symptoms and check points
The following symptoms are not malfunctions
Symptoms Check points Countermeasure and check detailsTemperature inside the showcase is at abnormal level.
Is the outdoor unit running? Check the operation switch, signal line R1·R2 and malfunction display.
Is the sight glass liquid-sealed (in cooling)?
Charge refrigerant.
Is the showcase's fan running? Check the disconnection, and malfunction. (in the showcase)
Is the showcase's solenoid valve operating properly?
Rectify the solenoid valve.
Is the showcase's thermostatic expansion valve operating properly? (No broken capillaries?)
Check the state of mounting the body and feeler bulb.
Is the defrost operation conducted properly? (No excessive frosting?)
Actuate the forced defrosting. Check the defrosting cycle and the disconnection in the heater.
Is the outdoor unit heat exchanger blocked with dust or the like?
Clean the heat exchanger.
Is the air curtain blocked at the air outlet or inlet of showcase?
Remove the obstacles.
Equipment does not run.
Check to be sure the malfunction code on the remote controller.
Countermeasure to the malfunction code.
Check to be sure the malfunction LED display on the outdoor unit PCB.
Countermeasure to the malfunction LED display.
Symptoms CausesEquipment does not operate.
When the equipment is restart immediately after it stops.
The equipment is controlled in an affordable way.The equipment will automatically start running after a lapse of 1 to 5 min.
Immediately after power supply in turned ON.
The equipment is kept in standby mode until the micro-computer gets ready for operation. Wait for a period of approx. 2 min.
Sounds are produced.
(Outdoor unit)A faint continuous hissing sound produced while in refrigerating operation.
This is a sound produced when gas (refrigerant) flows to the outdoor unit.
(Outdoor unit)A faint continuous hissing sound produced immediately after startup or stop of the unit.
This is a sound when gas (refrigerant) stops flowing or the flow is changed.
(Outdoor unit)An operating sound changes in the tone interval.
This sound is produced through changing the compressor operating frequency.
The outdoor unit fan does not run.
While in operation. The fan speed is controlled in order to put the equipment into optimum operating conditions.
Troubleshooting SiENBE28-901
74 Air Cooled Refrigeration Condensing Unit
1. Guideline for right operating conditions.
Operating conditions: outdoor temp.: 32°CD.B.Note that the values shown above may vary significantly, depending on the environment in which the unit is being used.
2. Emergency operation in the case of a compressor with poor electrical insulation(This only applies to a system with multiple compressors.)Usually, if a compressor stops because of a problem, the system will automatically perform a backup operation (i.e., emergency operation) using other, properly-functioning compressors.However, if the source breaker trips due to poor electrical insulation of a compressor, the whole system will shut down and no backup operation will be possible.If this happens, you need to run the other working compressors using the following procedures.
2-1. Procedure of emergency operationOperating the main circuit breaker twice makes it possible to conduct the forced backup operation. (i.e., to prohibit the operation of compressors having a failure in insulation and only to forcedly run operable compressors.)
(Procedures)1. Set the main circuit breaker of the outdoor unit to ON.
2. Set the main circuit breaker to ON again.(The forced backup operation will be initiated.)
Precautions:
Item Measuring method Right range
High pressure (MPa)
Measure with a service checker or pressure gauge in a stable state 20 minutes or more after starting operation.
2.1 - 2.7 MPa
Low pressure (MPa)
Measure with a service checker or pressure gauge in a stable state 20 minutes or more after starting operation.
0.0 MPa to target LPm + 0.05 MPa
Discharge pipe temperature
(°C)Measure the temperature using a surface thermometer or service checker.
(Tc + 10) to 120°CTc: high pressure equivalent saturation
temperatureSuction pipe temperature
(°C)Measure the temperature using a surface thermometer or service checker.
(Te + 10) to 50°CTe: low pressure equivalent saturation
temperature
Restarting operation will make automatic judgement on the insulation conditions of parts concerned again.↓"Malfunction judgement": The main circuit breaker will be set to OFF again.
→"Normal judgement": The operation will be continued.
The timing to turn OFF the circuit breaker varies with faulty parts.If the INV compressor has a failure in insulation, the circuit breaker will be immediately activated. However, if the STD compressor has a failure in insulation, it may take time to activate the circuit breaker due to loads applied.
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 75
2-2. Procedures to be taken after beginning emergency operation until compressor replacement is complete and normal operation resumes1.Change the outdoor unit operation switch from "LOCAL" or "REMOTE" to "OFF".2.Turn off the outdoor unit's main breaker.3.Replace the defective compressor with a new one.4.Turn the outdoor unit breaker back on.
(*Make sure that the operation switch is set to "OFF" before turning on the main breaker.)
5.Change the outdoor unit operation switch from "OFF" to "LOCAL" or "REMOTE".
3. Contact our service department for details about the setting procedures for the AIRNET and service checker, and the precautions for use.3-1. When using the AIRNET:
Specify the outdoor unit AirNet address settings (Setting Mode 2-06).Specify the virtual indoor unit address settings (Setting Mode 2-16).(The settings described above are necessary even if you are not using the AIRNET, but are using an ST controller.)(Contact our service department when connecting a system to a VRV or other systems.)
3-2. When using a service checker:Specify the virtual indoor address settings (Setting Mode 2-16).
Note: Be sure to stop the system operation (compressors) before running a test of the AIRNET or using a service checker.
Troubleshooting SiENBE28-901
76 Air Cooled Refrigeration Condensing Unit
6.2 List of Malfunction CodesNo. Item
Code(Remotecontrol display)
Detection device Criteria
Timesofretry
LRMEQ5, 6AY1LRLEQ5, 6AY1
LRMEQ8, 10, 12AY1LRLEQ8, 10, 12AY1
LRMEQ15, 20AY1LRLEQ15, 20AY1
RemarksLevel
Mal-function output
Output during backup
LevelMal-
function output
Output during backup
LevelMal-
function output
Output during backup
1STDcompressor OCactivation
E0 Current sensor 14.95A 2 — — — Alarm — ON Alarm — ON
Manual reset"Reset the power supply" or "Turn the operation switch ON to OFF"
2 Earth leakage E2
• Leakage breaker
• Earth leakage breaker activates within 20 seconds after compressor startup 0 Shutdown — ON Alarm — ON Alarm — ON
Manual reset"Reset the power supply" or "Turn the operation switch ON to OFF"• Leakage
detector PCB
• Leakage detector PCB is activated when HP<3.6MPa
3Abnormal high pressure level
E3
• High pressure switch
• 3.8MPa or more 0 Shutdown ON — Alarm — ON Alarm — ONManual reset"Reset the power supply" or "Turn the operation switch ON to OFF"
• High pressure sensor
• 3.55MPa or more3 Shutdown ON — Alarm — ON Alarm — ON5 — — — Shutdown ON — Alarm — ON7 — — — — — — Shutdown ON —
4Abnormal low pressure level
E4Low pressure sensor
SW5 is OFF• 0MPa or less (MT)• -0.015MPa or less (LT)
4 Shutdown ON — Shutdown ON — Shutdown ON —
Manual reset"Reset the power supply" or "Turn the operation switch ON to OFF"Refer to P.56 "(10) Low pressure protection control".
5INVcompressor lock
E5 Inverter PCB Position signal error 4 Shutdown ON — Alarm — ON Alarm — ON
Manual reset"Reset the power supply" or "Turn the operation switch ON to OFF"
6Outdoor fan motor malfunction
E7 Fan driver PCB
Irregular fan motor revolution 4 Shutdown ON — Alarm — ON Alarm — ON
Manual reset"Reset the power supply" or "Turn the operation switch ON to OFF"
7Electronic expansion valve malfunction
E9 Main PCBNo continuity of electronic expansion valve coil
0 Shutdown ON — Shutdown ON — Shutdown ON — Manual reset"Reset the power supply"
8Abnormal discharge pipe temperature
F3Discharge pipe thermistor
• Discharge pipe temp. >150°C 0 Shutdown ON — Alarm — ON Alarm — ON
Manual reset"Reset the power supply" or "Turn the operation switch ON to OFF"
• Discharge pipe temp. >120°C continuously for 70 sec. or more
• Discharge pipe temp. >125°C continuously for 30 sec. or more
• Discharge pipe temp.>130°C
14 Shutdown ON — Alarm — ON Alarm — ON
Discharge pipe temp. >110°C, and EV2_pls≥450 pls, and EV3_pls≥450 pls continuously for 60 sec.
3 Shutdown ON — Alarm — ON Alarm — ON
5 — — — Shutdown ON — Alarm — ON
7 — — — — — — Shutdown ON —
9 3-sensor malfunction H0
Outdoor air thermistorSuction pipe thermistorDischarge pipe thermistorHeat exchanger intermediate inlet thermistorHeat exchanger intermediate outlet thermistorHigh pressure sensorLow pressure sensor
When 3 or more sensors detect abnormality
0 Shutdown ON — Shutdown ON — Shutdown ON —Manual reset"Reset the power supply" or "Turn the operation switch ON to OFF"
10High pressure switch failure
H3 Main PCB No continuity of high pressure switch 0 Shutdown ON — Shutdown ON — Shutdown ON —
Manual reset"Reset the power supply" or "Turn the operation switch ON to OFF"
11 INVmalfunction L1 Inverter
PCBMalfunction of IGBT or INV is defected four times in an hour
0 Shutdown ON — Shutdown ON — Shutdown ON — Manual reset"Reset the power supply"
12Radiating fin temperature rise
L4 Inverter PCB 94°C 9 Shutdown ON — Alarm — ON Alarm — ON
Manual reset"Reset the power supply" or "Turn the operation switch ON to OFF"
13
INVcompressor instantaneousovercurrent
L5 Inverter PCB 9 Shutdown ON — Alarm — ON Alarm — ON
Manual reset"Reset the power supply" or "Turn the operation switch ON to OFF"
14INVcompressor overcurrent
L8 Inverter PCB 16.1A or more 9 Shutdown ON — Alarm — ON Alarm — ON
Manual reset"Reset the power supply" or "Turn the operation switch ON to OFF"
15Faulty INV compressor startup failure
L9 Inverter PCB 2 Shutdown ON — Alarm — ON Alarm — ON
Manual reset"Reset the power supply" or "Turn the operation switch ON to OFF"
16Transmission failure between control PCB and inverter PCB
LC Inverter PCB
Transmission failure between main PCB and inverter PCB
No limit Alarm — ON Alarm — ON Alarm — ON Automatic reset
17INVcompressor power voltage imbalance
P1 Inverter PCB 9 Shutdown ON — Alarm — ON Alarm — ON
Manual reset"Reset the power supply" or "Turn the operation switch ON to OFF"
18 Radiation fin thermistor P4 Inverter
PCBFin thermistor open circuit or short circuit
No limit Alarm — ON Alarm — ON Alarm — ON Automatic reset
19Reversed phase / Open phase
U1 Main PCB Reversed phase or open phase 0 Shutdown ON — Shutdown ON — Shutdown ON — Manual reset
"Reset the power supply"
20INVcompressor abnormal power voltage
U2 Inverter PCB 9 Shutdown ON — Alarm — ON Alarm — ON
Manual reset"Reset the power supply" or "Turn the operation switch ON to OFF"
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 77
6.3 Checking Malfunction Codes by LED Lamps on PCB1) Simple diagnosis by the LED error displayIn Setting Mode 1-11, the error status of each component can be checked by reading the blinking LED.[Steps]Operate the pushbuttons on the PCB (in Setting Mode 1) and malfunction codes will be displayed by LEDs.Follow the steps below to check your unit.1. Press the MODE button (BS1). (Setting Mode 1 will be entered.)2. Pressing the SET button (BS2) will go to item No.1 (see the list of output items).3. Pressing the RETURN button (BS3) will display any error for item No.1 using the LED
(Normal: OFF, Error: Blinking).4. Pressing the MODE button (BS1) will go back to the initial state.
Troubleshooting SiENBE28-901
78 Air Cooled Refrigeration Condensing Unit
2) In Setting Modes 1-14 and on, it is possible to use the LED to check the error and retry details, using the same steps as previously described (see the next page).
BS1
MODE
BS2
SET
BS3
RETURN
BS4
TEST
BS5
RESET
NO Setting Large item Middle item Small item Description1 Setting Mode 1, No. 1
Malfunction output
System
Reversed phase H7P blinks when reversed phase is detected.2 Setting Mode 1, No. 1 INV earth leakage H6P blinks when INV earth leakage is detected.3 Setting Mode 1, No. 1 STD1 earth leakage H5P blinks when STD1 earth leakage is detected.4 Setting Mode 1, No. 1 STD2 earth leakage H4P blinks when STD2 earth leakage is detected.5 Setting Mode 1, No. 2
EVEV1 H7P blinks when EV1 error occurs.
6 Setting Mode 1, No. 2 EV2 H6P blinks when EV2 error occurs.7 Setting Mode 1, No. 2 EV3 H5P blinks when EV3 error occurs.8 Setting Mode 1, No. 3
Pressure sensorHP H5P blinks when HP sensor error occurs.
9 Setting Mode 1, No. 3 LP1 H7P blinks when LP1 sensor error occurs.10 Setting Mode 1, No. 4
Temperature sensor 1
Td1 H7P blinks when Td1 sensor error occurs.11 Setting Mode 1, No. 4 Td2 H6P blinks when Td2 sensor error occurs.12 Setting Mode 1, No. 4 Td3 H5P blinks when Td3 sensor error occurs.13 Setting Mode 1, No. 4 Ti1 H4P blinks when Ti1 sensor error occurs.14 Setting Mode 1, No. 5
Temperature sensor 2Ta H7P blinks when Ta sensor error occurs.
15 Setting Mode 1, No. 5 Tg H6P blinks when Tg sensor error occurs.16 Setting Mode 1, No. 5 TL H5P blinks when TL sensor error occurs.17 Setting Mode 1, No. 6
Current sensorCT1 H7P blinks when CT1 sensor error occurs.
18 Setting Mode 1, No. 6 CT2 H6P blinks when CT2 sensor error occurs.19 Setting Mode 1, No. 7
Protection deviceHPS H7P blinks when HPS is detected.
20 Setting Mode 1, No. 7 HPSL H6P blinks when HPSL is detected.21 Setting Mode 1, No. 8 Transmission INV H7P blinks when INV transmission error occurs.22 Setting Mode 1, No. 9
INV error 1
L1 H7P blinks when L1 error occurs.23 Setting Mode 1, No. 9 L4 H6P blinks when L4 error occurs.24 Setting Mode 1, No. 9 L5 H5P blinks when L5 error occurs.25 Setting Mode 1, No. 9 L8 H4P blinks when L8 error occurs.26 Setting Mode 1, No. 9 L9 H3P blinks when L9 error occurs.27 Setting Mode 1, No. 10
INV error 2
E5 H7P blinks when E5 error occurs.28 Setting Mode 1, No. 10 U2 H6P blinks when U2 error occurs.29 Setting Mode 1, No. 10 P1 H5P blinks when P1 error occurs.30 Setting Mode 1, No. 10 P2 H4P blinks when P2 error occurs.31 Setting Mode 1, No. 11
Malfunction of fan
E7 (FAN1) H7P blinks when E7 error occurs.32 Setting Mode 1, No. 11 H7 (FAN1) H6P blinks when H7 error occurs.33 Setting Mode 1, No. 11 E7 (FAN2) H7P blinks when E7 error occurs.34 Setting Mode 1, No. 11 H7 (FAN2) H6P blinks when H7 error occurs.
35 Setting Mode 1, No. 14
Malfunction output
Malfunction contents (latest) — 0~63 (6bit)
(See the list of malfunction codes.)
36 Setting Mode 1, No. 15 Malfunction contents (one before) — 0~63 (6bit)
(See the list of malfunction codes.)
37 Setting Mode 1, No. 16 Malfunction contents (two before) — 0~63 (6bit)
(See the list of malfunction codes.)
38 Setting Mode 1, No. 17 Software number display — 0~63 (6bit)
39 Setting Mode 1, No. 18 HP — 0~63 (6bit)
40 Setting Mode 1, No. 19 Software version display — 0~63 (6bit)
41 Setting Mode 1, No. 20 Retry description (latest) — 0~63 (6bit)
(See the list of malfunction codes.)
42 Setting Mode 1, No. 21 Retry description (one before) — 0~63 (6bit)
(See the list of malfunction codes.)
43 Setting Mode 1, No. 22 Retry description (two before) — 0~63 (6bit)
(See the list of malfunction codes.)
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 79
6.4 Checking Malfunction Codes of the Condensing UnitOperate the pushbuttons on the PCB and malfunction codes will be displayed by LEDs.Setting Modes: 1-14, 15, 16, 20, 21, 22[Steps]1. Make sure that the "H1P" LED is OFF.
(If the LED is ON, press the MODE button (BS1) once.)2. Press the MODE button (BS1) once to enter the "monitor mode".3. Pressing the RETURN button (BS3) will display the first digit of a malfunction code by LED.4. Pressing the SET button (BS2) will display the second digit of the malfunction code by LED.5. Pressing the MODE button (BS1) will go back to the former state.
BS1
MODE
BS2
SET
BS3
RETURN
BS4
TEST
BS5
RESET
LED display Remote controller display
Malfunction contents Pagereferred(Pressing the BS3 switch once) (Pressing the BS2 switch once)
H1P H2P H3P H4P H5P H6P H7P H1P H2P H3P H4P H5P H6P H7P
l h k h h l l l k h
h h h h E0 STD Compressor Motor Overcurrent/Lock P.84
h h l h E2 Earth Leakage P.86
h h l l E3 Actuation of High Pressure Switch P.88
h l h h E4 Actuation of Low Pressure Sensor P.90
h l h l E5 Inverter Compressor Motor Lock P.92
h l l l E7 Malfunction of Outdoor Unit Fan Motor P.94
l h h l E9 Malfunction of Electronic Expansion Valve Coil P.97
l h k h l h l l k h h h l l F3 Abnormal Discharge Pipe Temperature P.99
l h k h l h h l k h
h h h h H0 Three-sensor Malfunction P.101
h h l l H3 Malfunction Related to High Pressure Switch P.103
h l l l H7 Abnormal Outdoor Fan Motor Signal P.104
l h h l H9 Malfunction of Outdoor Air Thermistor P.106
l h k h l l h l k h
h h l h J2 Current Sensor Malfunction P.107
h h l l J3 Malfunction of Discharge Pipe Thermistor P.108
h l h l J5 Malfunction of Suction Pipe Thermistor P.108
l h h h J8 Malfunction of Heat Exchanger Intermediate Inlet Thermistor P.108
l h h l J9 Malfunction of Heat Exchanger Intermediate Outlet Thermistor P.108
l h l h JA Malfunction of High Pressure Sensor P.110
l l h h JC Malfunction of Low Pressure Sensor P.112
l h k h l l l l k h
h h h l L1 Faulty Inverter PCB P.114
h l h h L4 Malfunction of Inverter Radiating Fin Temperature Rise P.115
h l h l L5 INV Compressor Instantaneous Overcurrent P.116
l h h h L8 INV Compressor Overload P.118
l h h l L9 Faulty INV Compressor Startup P.120
l l h h LC Malfunction of Transmission (between Inverter PCB and Main PCB) P.122
l h k l h h h l k hh h h l P1 Power Supply Voltage Imbalance P.124
h l h h P4 Faulty Radiation Fin Thermistor P.125
l h k l h h h l k h l l h l PJ Faulty of Capacity Setting —
l h k l h h l l k hh h h l U1 Reverse Phase / Open Phase P.126
h h l h U2 Abnormal Power Supply Voltage P.127
Troubleshooting SiENBE28-901
80 Air Cooled Refrigeration Condensing Unit
6.5 Troubleshooting by RAM MonitorUsing the RAM monitor makes it possible to check the following operating data. Use this monitor for troubleshooting.
[Main]
[Mode]
SP_No. SP numberVer. Version of software (Used for updating the software for PCB)
Hp_codeThe comparison between HP_code and the model on the RAM Monitor screen is as follows.1:5AY1, 2:6AY1, 3:8AY1, 4:10AY1, 5:12AY1, 6:15AY1, 7:20AY1
Operation_SW OPERATION switch bits (OFF/ON:0/1)unit_driving No need for checking because it is not used.
Mode Present mode of operationNext_mode The following mode of operation
Before_mode The previous mode of operationMode_complete Driving mode completion bits (OFF/ON:0/1)Start_complete Start driving completion bits (OFF/ON:0/1)
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 81
[Sensor]
[Actuator]
Mark onRAM Monitor
Mark of paragraph of trouble repair
Mark of electric wiring diagram
chartMeaning
Ta Ta R1T Ambient temperature thermistorTd1 Td1 R31T Discharge temperature thermistor (INV Comp)Td2 Td2 R32T Discharge temperature thermistor (STD1)Td3 Td3 R33T Discharge temperature thermistor (STD2)Ti Ti R2T Suction temperature thermistor
Tce Tce R3T Outdoor heat exchanger outlet thermistorTg1 Tg R5T Subcool heat exchanger outlet thermistorTL TL R6T Subcool heat exchanger inlet thermistorHP HP S1NPH High pressure sensorLP LP S1NPL Low pressure sensor
CT1 — A6P Current sensor (STD1)CT2 — A7P Current sensor (STD2)
Tcl — — Liquid side condensation pressure equivalent saturation temperature (calculation value)
Tcg — — Gas side condensation pressure equivalent saturation temperature (calculation value)
Teg — — Gas side evaporation pressure equivalent saturation temperature (calculation value)
Mark onRAM Monitor
Mark of paragraph of trouble repair
Mark of electric wiring diagram
chartMeaning
52ci INV M1C INV compressor driven bits(OFF/ON:0/1)52C1_[X5A] STD1 M2C STD1 compressor driven bits(OFF/ON:0/1)52C2_[X6A] STD2 M3C STD2 compressor driven bits (OFF/ON:0/1)20S1_[X9A] 4 WAY VALVE Y3S Solenoid valve (4 way valve ) bits (OFF/ON:0/1)SV2_[X8A] SV2 Y2S Solenoid valve (STD1) bits(OFF/ON:0/1)
SV3_[X15A] SV3 Y5S Solenoid valve(STD2) bits (OFF/ON:0/1)EV1 EV1 Y1E Electric expansion valve(main) pulse(0~480)
EV2 EV2 Y2E Electric expansion valve(Economizer) pulse(0~480)
EV3 EV3 Y3E Electric expansion valve(INV) pulse(0~480)Ftc — — INV step
INV_Hz — — INV HzFansp — — Fan stepFan1 — M1F Fan rotationFan2 — M2F Fan rotation
TotalHz — — Total compressor Hz(STD is calculated as 166Hz)
R1 — OPERATINGOUTPUT
Operating output(For liquid solenoid valve control of showcase) bits (OFF/ON:0/1)
Troubleshooting SiENBE28-901
82 Air Cooled Refrigeration Condensing Unit
[Data]
[Amp/Fin]
[Irregular stop]
Mark on RAM Monitor Meaning (Calculation value from sensor)SH Suction super heat
TdSH1 Discharge super heat(INV)TdSH2 Discharge super heat(STD1)TdSH3 Discharge super heat(STD1)
LpmTarget evaporation temperature equivalent pressure (Lpm is saturation temperature equivalent pressure of Tst. Tst=f(Lpm)=Tsd+ΔTsp+ΔTsn=f(Lpm1)+f(ΔTm)+ΔTsn
Lpm1 Target evaporation temperature equivalent pressure(Lpm1 is saturation temperature equivalent pressure of Tsd.)
ΔTm_ho ΔTm is an equivalent saturation pressure value of ΔTsp.
Mark on RAM Monitor Meaning Inv_1_Amp The first inverter currentInv_2_Amp The second inverter currentFin_Temp Temperature of INV fin
Fan1_1_Amp The first fan1 currentFan1_2_Amp The second fan1 currentFan2_1_Amp The first fan2 currentFan2_2_Amp The second fan2 current
Mark on RAM Monitor Meaning Irregular stop Irregular stop bits (Normality/abnormality:0/1)
Inv_Abnomal_fixation Inverter compressor abnormality and fixation bits(Normality/abnormality:0/1)STD1_Abnomal_fixation STD1 compressor abnormality and fixation bits(Normality/abnormality:0/1)STD2_Abnomal_fixation STD2 compressor abnormality and fixation bits(Normality/abnormality:0/1)FAN1_Abnomal_fixation FAN1 compressor abnormality and fixation bits(Normality/abnormality:0/1)FAN2_Abnomal_fixation FAN2 compressor abnormality and fixation bits(Normality/abnormality:0/1)
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 83
[Retry]
[Abnormal_code]
[State]
Ignore the number since it is not clear which number will be displayed
Mark on RAM Monitor Error code Meaning
F0 F3 Frequency of retrying of Abnormal Discharge Temperature(system)
F1 F3 Frequency of retrying of Abnormal Discharge Temperature(INV)
F2 F3 Frequency of retrying of Abnormal Discharge Temperature(STD1)
F3 F3 Frequency of retrying of Abnormal Discharge Temperature(STD2)
F4 E3 Frequency of retrying of Actuation of High Pressure Sensor F5 E4 Frequency of retrying of Actuation of High Pressure SensorF6 E6 Frequency of retrying of Actuation of High HPSL
F7 E0 Frequency of retrying of STD1 Compressor Motor Overcurrent/Lock
F8 E0 Frequency of retrying of STD2 Compressor Motor Overcurrent/Lock
F9 E5 Frequency of retrying of Inverter Compressor Motor LockF10 L9 Frequency of retrying of Faulty INV Compressor StartupF11 L8 Frequency of retrying of Inverter Compressor Overload
F12 L5 Frequency of retrying of Inverter Compressor instantaneous Overcurrent
F13 U2 Frequency of retrying of Abnormal Power Supply Voltage
F14 L4 Frequency of retrying of Malfunction of Inverter Radiating Fin Temperature Rise
F17 P1 Frequency of retrying of Power Supply Voltage ImbalanceF21 E7 Frequency of retrying of Malfunction of Outdoor Unit Fan1 MotorF22 H7 Frequency of retrying of Abnormal Outdoor Unit Fan1 Motor SignalF24 E7 Frequency of retrying of Malfunction of Outdoor Unit Fan2 MotorF25 H7 Frequency of retrying of Abnormal Outdoor Unit Fan2 Motor Signal
Mark on RAM Monitor Meaning Abnormal_code It depends on the table below
Abnormal code on service
manual
Display on Ram monitor
screen
Abnormal code on service
manual
Display on Ram monitor
screen
Abnormal code on service
manual
Display on Ram monitor
screenE0 30 H3 43 L1 71E1 31 H7 47 L4 74E2 32 H9 49 L5 75E3 33 J2 62 L8 78E4 34 J3 63 L9 79E5 35 J5 65 LC 7CE7 37 J8 68 P1 81E9 39 J9 69 P4 84F3 53 JA 6A PJ 8DH0 40 JC 6C U1 91
U2 92
Mark on RAM Monitor Meaning State1 Normal when 5 or 9 is displayState2 Normal when 17 is display
Troubleshooting SiENBE28-901
84 Air Cooled Refrigeration Condensing Unit
6.6 Flow Chart for Troubleshooting6.6.1 “E0” STD Compressor Motor Overcurrent/Lock
RemoteControllerDisplay
E0
Applicable Models
LRMEQ8~20AY1LRLEQ8~20AY1
Method of Malfunction Detection
Detects the overcurrent with current sensor (CT).
Malfunction Decision Conditions
Malfunction is decided when the detected current value exceeds 14.95A for 2 seconds.
Supposed Causes
Closed stop valueObstacles at the air outletImproper power voltageFaulty magnetic switchFaulty compressorFaulty current sensor (A6P, A7P)Defect of outdoor unit PCB (A1P)
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 85
Troubleshooting
Note: ∗1 One of the possible factors may be chattering due to rough MgS contact.∗2 Abnormal case
The current sensor value is 0 during STD compressor operation.The current sensor value is more than 14.95A during STD compressor stop.
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Is the stop valve open?
Obstacle exists around the air
outlet.
Is the power supply voltage
normal?
Is the magnetic switch (K2M, K3M) normal?
(∗1)
Check the wiring from power supply ~ current sensor (A6P, A7P) ~ MgS (K2M, K3M) ~ compressor
Is above wiring correct?
Is current sensor correct? ∗1
NO
YES
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
Open the stop valve.
Remove the obstacle.
Correct the power voltage.
Replace the magnetic switch.
Correct wiring.
Replace the corresponding current sensor(A6P or A7P).
RetryReplace the outdoor unit PCB (A1P).
Replace the compressor.
Troubleshooting SiENBE28-901
86 Air Cooled Refrigeration Condensing Unit
6.6.2 “E2” Earth Leakage
RemoteControllerDisplay
E2
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
When there is a earth leakage (breaker ON/OFF)Time elapsed after power-on
When there is a earth leakage (leakage detector PCB)The continuity of the high pressure switch is checked using the protective device circuit.
Malfunction Decision Conditions
When there is a earth leakage (breaker ON/OFF)Within 10 seconds after the power is turned on
When there is a earth leakage (leakage detector PCB)If the high-pressure switch is activated but the pressure is not very high
Supposed Causes
Compressor (or the complete product) has defective insulation.High pressure switch connection failureFaulty leakage detector PCBNo continuity in high pressure switchTemporary liquid return or refrigerant sluggingPower failure during operationProlonged power shut downWithin 10 seconds after the power is turned on
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 87
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
More than 10 seconds passed since power-on
Shut off power.Remove the compressor lead wire.
No defective insulation on compressor
No defective insulation on entire
product
High pressure switch is properly
connected.
Leakage detector PCB fuse is not
blown.
Recover all wiring.
Turn on the power.
Leakage detector PCB is energized.
High pressure switch is energized
at both ends.
YES
NO
YES
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
Reset the power with the operation switch set to OFF.Earth leakage (breaker ON/OFF): E2
Replace the defective parts.Earth leakage (leakage detector PCB): E2
Replace the defective parts.Earth leakage (leakage detector PCB): E2
Correct connection.
Replace the leakage detector PCB.
Replace the leakage detector PCB.
Replace the high pressure switch.
It is likely that earth leakage occurred due to temporary liquid return or refrigerant slugging.Earth leakage is possible in the event of power failure during operation or prolonged power shutoff.
Troubleshooting SiENBE28-901
88 Air Cooled Refrigeration Condensing Unit
6.6.3 “E3” Actuation of High Pressure Switch
RemoteControllerDisplay
E3
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
The protection device circuit checks continuity in the high pressure switch.
Malfunction Decision Conditions
Error is generated when the HPS activation count reaches the number specific to the operation mode.(Reference) Operating pressure of high pressure switchOperating pressure:3.8MPaReset pressure: 2.85MPa
Supposed Causes
Actuation of outdoor unit high pressure switchDefect of high pressure switchDefect of outdoor unit main PCB (A1P)Instantaneous power failureFaulty high pressure sensor
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 89
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Check for the points shown below.(1)Is the stop valve open?(2)Is the HPS connector properly connected to the
main PCB?(3)Does the high pressure switch have continuity?
Are the three points above
OK?
(1)Mount a pressure gauge on the high pressure service port.
(2)Reset the operation with power breaker or operation switch and then restart the operation.
Does the stop due to malfunction (E3)
recur?
Is the HPS operating value normal (i.e.,
3.8MPa)?
Are the characteristics of the high pressure sensor
normal? (See ∗1.)
Service CheckerConnect the service checker to compare the “high pressure” value and the actual measurement value by pressure sensor (Refer to ∗1) by using the service checker.
Check if the “high pressure” value and the
actual measurement value by pressure sensor
are the same.
· The high pressure sensor is normal, and the pressure detected with the PCB is also normal.· The high pressure has really become high.
Referring to information on P134, remove the causes by which the high pressure has become high.CHECK 5
NO
YES
YES
NO
NO
YES
NO
YES
NO
YES
Rectify the defective points, if any.
Replace the HPS.
Replace the high pressure sensor.
Replace the main PCB (A1P).
∗1:Make a comparison between the voltage of the pressure sensor and that read by the pressure gauge.
∗2:Make measurement of voltage of the pressure sensor.
+5VConnector for high
pressure sensor (Red)
(4)
(3)
(2)
(1)
Red
Black
White
High pressure sensor
Micro-controller A/D input
Make measurement of DC voltage between these wires.
Troubleshooting SiENBE28-901
90 Air Cooled Refrigeration Condensing Unit
6.6.4 “E4” Actuation of Low Pressure Sensor
RemoteControllerDisplay
E4
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
Abnormality is detected by the pressure value with the low pressure sensor.
Malfunction Decision Conditions
Error is generated when the low pressure is dropped under compressor operation.Low pressure <0.00MPaDetected within 3 hours after power-on
Supposed Causes
Abnormal drop of low pressureDefect of low pressure sensorDefect of outdoor unit PCBStop valve is not openedShortage of gasMoisture choke
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 91
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Is the stop valve open?
(1)Mount a pressure gauge on the low pressure service port.
(2)Reset the operation and then restart the operation.
Are the characteristics of the low pressure sensor normal?
(See ∗1.)
Service CheckerConnect the service checker to compare the “low pressure” value and the actual measurement value by pressure sensor (Refer to ∗1) by using the service checker.
Check if the “low pressure” value and the
actual measurement value by pressure sensor
are the same.
· The low pressure sensor is normal, and the pressure detected with the PCB is also normal.
· The low pressure has really become low.
Referring to information on P135, remove the causes by which the low pressure has become low.
CHECK 6
∗1:Make a comparison between the voltage of the pressure sensor and that read by the pressure gauge.
∗2:Make measurement of voltage of the pressure sensor.
NO
YES
NO
YES
NO
YES
Open the stop valve.
Replace the low pressure sensor.
Replace the main PCB (A1P).
+5VConnector for low pressure sensor
(Blue)
(4)
(3)
(2)
(1)
Red
Black
WhiteMicro-controller A/D input
Make measurement of DC voltage between these wires.
Low pressure sensor
Checking for clogTo check for the presence of clog, measure the pipe temperatures at the locations before and after the check point.(1) Electronic expansion valve (2) Secondary equipment filter (3) Dryer (4) Outdoor unit filter
Troubleshooting SiENBE28-901
92 Air Cooled Refrigeration Condensing Unit
6.6.5 “E5” Inverter Compressor Motor Lock
RemoteControllerDisplay
E5
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
Inverter PCB takes the position signal from UVW line connected between the inverter and compressor, and the malfunction is detected when any abnormality is observed in the phase-current waveform.
Malfunction Decision Conditions
This malfunction will be output when the inverter compressor motor does not start up even in forced startup mode.
Supposed Causes
Inverter compressor lockHigh differential pressure (0.5MPa or more)Incorrect UVW wiringFaulty inverter PCBStop valve is left in closedSlugging state of refrigerantAbrasion of sliding parts caused by wet operation due to faulty secondary equipment expansion valveFailure of oil return due to faulty onsite piping workLiquid return caused by operation signal connection failure
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 93
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Check if the stop valve is open.
Check if the relay wires to the compressor are
correct.
Check if the connection of UVW phase order is
correct.
Check if the wiring is the same as in the electric wiring
diagram.
The insulation resistance of the compressor is low (not
more than 100kΩ).
The compressor coil has disconnection of
wires.
Power OFF
Power ON
Restart and check the operation. Check if the condition
occurs again.
Check if the start mode is in the high differential pressure (not less
than 0.5 MPa).
YES
NO
YES
NO
YES
NO
YES
NOCheck if the wiring has any error in mistake for inverter compressor.
NO
YES
NO
YES
YES
NO
NO
YES
Local factorOpen the stop valve.
Replace the connecting wires and ensure right connection of the connector.
Ensure correct connection.W
U
VEnsure correct connection.
Replace the compressor.
Conclude the workThere is a possibility of defect of pressure equalizing.Check the refrigerant circuit.
Defect of pressure equalizingCheck the refrigerant circuit.
Replace the INV compressor.
∗1: Pressure difference between high pressure and low pressure before starting.
Troubleshooting SiENBE28-901
94 Air Cooled Refrigeration Condensing Unit
6.6.6 “E7” Malfunction of Outdoor Unit Fan Motor
RemoteControllerDisplay
E7
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
While the fan motor is in operation, detect the malfunction related to the fan motor according to revolutions detected with the hall sensor IC.
Malfunction Decision Conditions
The fan revolutions are kept at less than a certain value for a period of not less than 6 seconds when the fan motor meets rotating conditions.The revolutions detection connector is disconnected.When the malfunction occurs 4 times, an alarm will be output. When it occurs 5 times, the system will go down.
Supposed Causes
Failure of fan motorDefect or connection error of the connectors / harness between the fan motor and PCBThe fan can not rotate due to any foreign substances entangledClear condition: Continue normal operation for 10 minutes
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 95
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
LRL(M)EQ15A, 20AY1 have 2 fans.
Cut the power supply OFF and wait for 10 minutes.
Check if any foreign substances around
the fan.
YES
NO
Check connectors for their connections For fan motor 1: Relay connectors X1A and X2A or
connectors of compressor inverter PCB X1A and X2A
For fan motor 2: Relay connectors X3A and X4A or connectors of fan inverter PCB X1A and X2A
Check if any connector is
disconnected.YES
NO
Check the relay connectors for their color For fan motor 1: White for all power supply and signal
cables For fan motor 2: Red on the PCB side and white on the
motor side for all power supply and signal cables
Relay connectors have any connection
error.
YES
NO
A
Remove the foreign substances.
Insert the connector.
Correct the connection of the relay connectors.
LRMEQ05~12AY1LRLEQ05~12AY1
LRMEQ15, 20AY1LRLEQ15, 20AY1
A4PP1 N1
X5A
X3AF1U R10+ - X4A
V1RX2A
X1AZ5CN=1
X1A
5
X2A
5M1F
MS3~
RED WHT
BLK
A4P A8PP1 P2 N1 N2
X5A
X3AF1U R10+ - X4A
V1R
X51A
X2AX1A
Z5C N=1X1A
5
X2A
5M1F
MS3~
RE
DW
HTB
LK
P1 N1X5A
X3AF1U R10+ - X4A
V1RX2A
X1AZ9CN=1
X3A
5
X4A
5M2F
MS3~
RE
DW
HTBL
K
RED
WHT
RED
RED
WHT
Troubleshooting SiENBE28-901
96 Air Cooled Refrigeration Condensing Unit
Troubleshooting
A
No continuity of fuse (FIU) on the fan inverter PCB.
YES
NO
Unable to rotate the fan manually with ease when removing the connector of
the fan motor.
YES
NO
Resistance value between the power supply wire terminal of fan
motor and the motor frame (metal) is 1MΩ and below.
YES
NO
Check fan motor connector (power supply wire)
The resistance value between UVW phases of fan motor is out of balance, or short circuit between
UVW phases.
YES
NO
Check fan motor connector (signal wire)
The signal wire short circuits between Vcc and GND and between UVW
and GND.
YES
NO
Put the power supply ON to check the following LED lamps.1) HAP lamp on the compressor PCB (A3P)2) HAP lamp on the fan inverter PCB (A4P)
HAP lamp for the A4P does not blink on the condition that HAP lamp for A3P is
blinking.
YES
NO
Replace fan inverter PCB.
Replace the corresponding fan motor.
Replace the corresponding fan motor.
Replace the corresponding fan motor.
Replace the corresponding fan motor.
Replace the fan inverter PCB.
Replace the fan motor 2.
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 97
6.6.7 “E9” Malfunction of Electronic Expansion Valve Coil
RemoteControllerDisplay
E9
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
To be detected based on continuity existence of coil of electronic expansion valve (Y1E)
Malfunction Decision Conditions
No current is detected in the common (COM [+]) when power supply is ON.
Supposed Causes
Disconnection of connectors for electronic expansion valve (Y1E, Y2E, Y3E)Defect of electronic expansion valve coilDefect of outdoor unit main PCB (A1P)
Troubleshooting SiENBE28-901
98 Air Cooled Refrigeration Condensing Unit
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Turn power supply off, and turn power supply on again.
Return to normal?YES
NO
The connector of outdoor unit PCB (A1P) for
electronic expansion valve is connected.
NO
YES
The coil resistance of electronic expansion
valve is normal. (Refer to ∗1)
NO
YES
External factor other than malfunction (for example, noise etc.).
Ensure correct connection.
Replace the electronic expansion valve coil.
Replace outdoor unit PCB (A1P).
∗ Make measurement of resistance between the connector pins, and then make sure the resistance falls in the range of 40 to 50Ω.
(Orange) 1
(Red) 2
(Yellow) 3
(Black) 4
5
COM[+] (Gray) 6
Measuring points Judgment criteria1 - 6
40~50Ω2 - 63 - 64 - 6
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 99
6.6.8 “F3” Abnormal Discharge Pipe Temperature
RemoteControllerDisplay
F3
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
Abnormality is detected according to the temperature detected by the discharge pipe temperature sensor.
Malfunction Decision Conditions
When the discharge pipe temperature rises to an abnormally high level.
Supposed Causes
Faulty discharge pipe temperature sensorFaulty discharge pipe temperature thermistorFaulty outdoor unit PCBInsufficient injection at intermediate heat exchanger outlet caused by flash gas due to gas leakage or insufficient volume of refrigerant.Clogging of electronic expansion valve for injectionFailure to open the maintenance valveInsufficient insulation of onsite suction pipe
orDischarge pipe temp. >120°C continuously for 70 sec. or moreDischarge pipe temp. >125°C continuously for 30 sec. or moreDischarge pipe temp. >130°C
&
Discharge pipe temp. >110°CEV2 · pls≥450 plsEV3 · pls≥450 plscontinuously for 60 sec.
Troubleshooting SiENBE28-901
100 Air Cooled Refrigeration Condensing Unit
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Connect the service checker. Press reset and start operation again.
Is the refrigerant amount proper?
YES
NO
Check the refrigerant piping line for clogging.
YES
NO
Connect the service checker, and the restart the system.
Check if discharge pipe thermistor
property is normal. (∗1)
YES
NO
Service CheckerConnect the service checker to compare the temperature of discharge pipe by using service checker with actual measurement value of discharge pipe thermistor (Refer to ∗1).
Check if temperature of discharge pipe by using service checker is the same with actual
measurement value of discharge pipe thermistor.
YES
NO
· Discharge pipe thermistor is normal and the temperature detection of the main PCB is also normal.
· Actually the temperature of discharge pipe is high.
Check 3 Remove the factor of overheat operation referring to P132.
∗1: Compare the resistance value of discharge pipe thermistor and the value based on the surface thermometer.(Refer to P106 for the temperature and resistance characteristics of thermistor)
Recover the refrigerant.Conduct vacuum drying, and then charge a proper amount of refrigerant.
Rectify the clogging.
Replace the discharge pipe thermistor.
Replace the main PCB (A1P).
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 101
6.6.9 “H0” Three-sensor Malfunction
RemoteControllerDisplay
H0
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
Malfunction is detected from the values detected by pressure sensors and temperature sensors(thermistors).
Malfunction Decision Conditions
Three or more out of the pressure sensors and the temperature sensors (thermistors) causes a "Sensor malfunction", respectively.
Supposed Causes
Faulty connection of sensorFaulty outdoor unit PCB
Troubleshooting SiENBE28-901
102 Air Cooled Refrigeration Condensing Unit
Troubleshooting
*1.List of relevant malfunction codes and connectors
Malfunction code Relevant thermistor
LRMEQ5, 6AY1LRLEQ5, 6AY1
LRMEQ8, 10, 12AY1LRLEQ8, 10, 12AY1
LRMEQ15, 20AY1LRLEQ15, 20AY1
Electricalsymbol Connector Electrical
symbol Connector Electrical symbol Connector
H9 Outdoor air thermistor R1T X18A R1T X18A R1T X18A
J3
Discharge pipe (M1C) thermistor R31T X29A R31T
X29AR31T
X29ADischarge pipe (M2C) thermistor — — R32T R32T
Discharge pipe (M3C) thermistor — — — — R33T
J5 Suction pipe thermistor R2T
X30A
R2T
X30A
R2T
X30AJ8Heat exchanger outlet thermistor R5T R5T R5T
J9Heat exchanger inlet thermistor R6T R6T R6T
JA High pressure sensor S1NPH X32A S1NPH X32A S1NPH X32A
JC Low pressure sensor S1NPL X31A S1NPL X31A S1NPL X31A
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
*Three or more sensors malfunction.
Check for the malfunction history (malfunction code) on the remote controller to identify three or more malfunctioning sensors. (See*1)
Check the malfunctioning sensor identified for their connector connection.
Is the resistance normal? (*1)
YES
NO
Troubleshoot according to the malfunction code of each malfunction sensor. (See the flowchart corresponding to each malfunction code.)
Is the resistance normal?
NO
Properly connect it.
Replace the relevant sensor.
Replace the outdoor unit PCB (control PCB).
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 103
6.6.10 “H3” Malfunction Related to High Pressure Switch
RemoteControllerDisplay
H3
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
Detect continuity in the high pressure switch in the protective device circuit.
Malfunction Decision Conditions
While the compressor stops running, there is no continuity in the high pressure switch.
Supposed Causes
Faulty high pressure switchBroken wire in the harness of high pressure switchFaulty connection of the connector of high pressure switchFaulty outdoor unit PCBBroken wire in lead wire
Troubleshooting
*1 The table below shows the connector numbers of the high pressure switch.
Model Relevant PCB Electric symbol Connector No.LRMEQ5, 6AY1LRLEQ5, 6AY1 A1P S1PH X2A
LRMEQ8, 10, 12AY1LRLEQ8, 10, 12AY1 A1P S1PH
S2PHX2AX3A
LRMEQ15, 20AY1LRLEQ15, 20AY1 A1P
S1PHS2PHS3PH
X2AX3AX4A
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Is the high pressure switch connector
properly connected to the outdoor unit PCB?
(See*1)
YES
NO
Stop the compressor for a period of 10 minutes, and then carry out the following checks.
Is there continuity in the high pressure
switch?
YES
NO
Is there continuity in the lead wire?
YES
NO
Properly connect it.
Replace the high pressure switch having no continuity in it.* Normal resistance:
Not more than 10Ω
Replace the lead wire.
Replace the outdoor PCB.
Troubleshooting SiENBE28-901
104 Air Cooled Refrigeration Condensing Unit
6.6.11 “H7” Abnormal Outdoor Fan Motor Signal
RemoteControllerDisplay
H7
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
Detection of abnormal signal from fan motor.
Malfunction Decision Conditions
In case of detection of abnormal signal at starting fan motor.
Supposed Causes
Abnormal fan motor signal (circuit malfunction)Broken, short or disconnection connector of fan motor connection cableFan Inverter PCB malfunction (A4P or A8P)
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 105
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Cut the power supply off.
Is the fan motor connector (X2A)
properly connected to the fan inverter
PCB?
YES
NO
Check the connector of the fan motor (∗1).
Check if the resistance of the fan motor lead wire
between Vcc and UVW and between GND and UVW
are balanced.
YES
NO
Ensure correct connection.
Replace the fan motor.
Replace the inverter PCB.For fan motor 1: replace the inverter PCB (A4P).For fan motor 2: replace the inverter PCB (A8P).
∗1. Check procedure for fan motor connector(1) Power OFF the fan motor.(2) Remove the connector (X2A) on the PCB to measure
the following resistance value.Judgement criteria: resistance value between each
phase is within ±20%
Connector for signal wires (X2A)
X2A
5 Gray
4 Pink
3 Orange
2 Blue
1 Yellow
GND
Vcc
W
V
U
Measure the resistance between Vcc-UVW and GND-UVW.
Troubleshooting SiENBE28-901
106 Air Cooled Refrigeration Condensing Unit
6.6.12 “H9” Malfunction of Outdoor Air Thermistor
RemoteControllerDisplay
H9
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
Malfunction is detected from the temperatures detected by the outdoor air thermistor.
Malfunction Decision Conditions
While in operation, the thermistor causes a broken wire or a short circuit in it.
Supposed Causes
Faulty thermistorFaulty connection of connectorFaulty outdoor unit PCB (control PCB)
Troubleshooting
*1. For "temperature and resistance characteristics of thermistor", refer to the table shown below.
Temp.(°C) Resistance(kΩ) Temp.(°C) Resistance
(kΩ)02468
65.859.453.748.644.0
3032343638
16.114.813.612.511.5
1012141618
40.036.333.030.127.4
4042444648
10.69.89.18.47.7
2022242628
25.022.920.919.117.5
5052545658
7.26.76.25.75.3
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Check for connector connection.
Is the resistance normal?
YES
NO
Disconnect the thermistor from the outdoor unit PCB, and then make resistance measurement using a multiple meter.
Is the resistance normal? (*1)
YES
NO
Properly connect it.
Replace the thermistor.
Replace the outdoor unit PCB (control PCB).
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 107
6.6.13 “J2” Current Sensor Malfunction
RemoteControllerDisplay
J2
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
Malfunction is detected from the current value detected by current sensor.
Malfunction Decision Conditions
When the current value detected by current sensor becomes 5A or lower, or 40A or more during STD compressor operation.
Supposed Causes
Faulty current sensorFaulty outdoor unit PCBDefective compressor
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Is the connector for current sensor
connected to X25A, X26A on outdoor unit
PCB (A1P)?
YES
NO
Are the current sensors inversely connected to two STD
compressors?
NO
YES
NO
YESApplicablecompressor coil wire
is broken.
Is the current sensor mounted on the T-phase wire?
YES
NO
Connect the connector, and operate unit again.
Correct the connections between the current sensors and the STD compressors.
Replace the compressor.
Mount the current sensor correctly, and operate the unit again.
Replace the current sensor.
Retry
Replace the outdoor unit PCB.(V3071)
Troubleshooting SiENBE28-901
108 Air Cooled Refrigeration Condensing Unit
6.6.14 “J3,J5,J8,J9” Faulty Thermistor
RemoteControllerDisplay
J3,J5,J8,J9
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
Malfunction is detected from the temperatures detected by thermistors.
Malfunction Decision Conditions
While in operation, any of the thermistors causes a broken wire or a short circuit in it.
Supposed Causes
Faulty connection of thermistorFaulty thermistorFaulty outdoor unit PCB
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 109
Troubleshooting
*1. List of malfunction codes, description of malfunction, and electric symbols
*2. For "temperature and resistance characteristics of thermistor", refer to information on P.138.
Malfunctioncode Relevant thermistor
LRMEQ5, 6AY1LRLEQ5, 6AY1
LRMEQ8, 10, 12AY1LRLEQ8, 10, 12AY1
LRMEQ15, 20AY1LRLEQ15, 20AY1
Electricalsymbol Connector Electrical
symbol Connector Electricalsymbol Connector
H9 Outdoor air thermistor R1T X18A R1T X18A R1T X18A
J3
Discharge pipe (M1C) thermistor R31T X29A R31TX29A
R31TX29ADischarge pipe (M2C) thermistor — — R32T R32T
Discharge pipe (M3C) thermistor — — — — R33T
J5 Suction pipe thermistor R2T
X30A
R2T
X30A
R2T
X30AJ8 Heat exchanger outlet thermistor R5T R5T R5T
J9 Heat exchanger inlet thermistor R6T R6T R6T
JA High pressure sensor S1NPH X32A S1NPH X32A S1NPH X32A
JC Low pressure sensor S1NPL X31A S1NPL X31A S1NPL X31A
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Is the malfunction code "J3"displayed?
NO
YES
There are multiple relevant thermistors. Identify the thermistor using the monitor mode of the outdoor unit PCB.
Check for connector connection. (*1)
Is the resistance normal?
YES
NO
Disconnect the thermistor from the outdoor unit PCB, and then make resistance measurement using a multiple meter.
Is the resistance normal? (*2)
YES
NO
Properly connect it.
Replace the thermistor.
Replace the outdoor unit main PCB.
Troubleshooting SiENBE28-901
110 Air Cooled Refrigeration Condensing Unit
6.6.15 “JA” Malfunction of High Pressure Sensor
RemoteControllerDisplay
JA
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
Malfunction is detected from the pressure detected by the high pressure sensor.
Malfunction Decision Conditions
When the high pressure sensor is short circuit or open circuit.(Not less than 4.3MPa, or 0.01MPa and below)
Supposed Causes
Defect of high pressure sensorConnection of low pressure sensor with wrong connectionDefect of outdoor unit PCBDefective connection of high pressure sensor
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 111
Troubleshooting
∗1: Voltage measurement point
∗2: Refer to “Voltage Characteristics of Pressure Sensor” table on P.139.
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
1.Set the high pressure gauge.2.Connect a RAM monitor.
Are the characteristics of the high pressure sensor
normal? (Make a comparison between the voltage characteristics
(∗1) and the gauge pressure.)
YES
NO
If the PCB pressure detection normal? (Make a comparison between the checker pressure data and the voltage characteristics (∗1).)
YES
NO
Reset the operation, and then restart the outdoor unit.
Are the characteristics of the high pressure sensor
normal? (*2)
YES
NO
Replace the high pressure sensor.
Replace the main PCB.
Replace the high pressure sensor.
Replace the main PCB.
Outdoor unit PCB (A2P)+5V
GND
Micro-computer A/D input
∗2 Measure DC voltage here.
Connector (Red)X32A
(4)
(3)
(2)
(1)
Red
Black
White
Hig
h pr
essu
re s
enso
r
(S1NPH)
(V2807)
Troubleshooting SiENBE28-901
112 Air Cooled Refrigeration Condensing Unit
6.6.16 “JC” Malfunction of Low Pressure Sensor
RemoteControllerDisplay
JC
Applicable Models
LRMEQ5~20PY1LRLEQ5~20PY1
Method of Malfunction Detection
Malfunction is detected from pressure detected by low pressure sensor.
Malfunction Decision Conditions
When the low pressure sensor is short circuit or open circuit.(Not less than 1.8MPa, or -0.1MPa and below)
Supposed Causes
Defect of low pressure sensorConnection of high pressure sensor with wrong connectionDefect of outdoor unit PCBDefective connection of low pressure sensorPiping with wrong connectionReduction of low pressure when the thermistors (Ti, Tg) are defective.
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 113
Troubleshooting
∗1: Voltage measurement point
∗2: Refer to “Voltage Characteristics of Pressure Sensor” table on P.139.
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
1.Set the low pressure gauge.2.Connect a RAM monitor.
Piping for different circuit is erroneously
connected.
YES
NO
Are the characteristics of the low pressure sensor normal? (Make
a comparison between the voltage characteristics (∗1) and
the gauge pressure.)
NO
YES
If the PCB pressure detection normal? (Make a comparison between the checker pressure
data and the voltage characteristics (*1).)
NO
YESReset the operation, and then
restart the outdoor unit.
Are the characteristics of the low pressure sensor
normal?(∗2)
NO
YES
Correct the piping.
Replace the low pressure sensor.
Replace the main PCB.
Replace the low pressure sensor.
Replace the main PCB.(V2808)
Outdoor unit PCB (A2P)+5V
GND
Micro-computer A/D input
∗2 Measure voltage here.
Connector X31A
(4)
(3)
(2)
(1)
Red
Black
White
Low
pre
ssur
e se
nsor
(S1NPL)
Troubleshooting SiENBE28-901
114 Air Cooled Refrigeration Condensing Unit
6.6.17 “L1” Faulty Inverter PCB
RemoteControllerDisplay
L1
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
Malfunction is detected from the current values while waveform is outputted prior to the startup of compressor.Malfunction is detected from the values detected by the current sensor in synchronized operation at startup.
Malfunction Decision Conditions
An overcurrent (OCP) flows while waveform is outputted.The current sensor malfunctions while in synchronized operation.IGBT malfunctions.
Supposed Causes
Faulty inverter PCB (A3P)• Faulty IPM• Faulty current sensor• Faulty IGBT or drive circuit
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Turn OFF the power supply once, and then ON it again.
Is the power supply normally reset?
YES
NO
There are possible external causes (e.g. noises) other than failures.
Replace the inverter PCB (A3P).
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 115
6.6.18 “L4” Malfunction of Inverter Radiating Fin Temperature Rise
RemoteControllerDisplay
L4
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
Fin temperature is detected by the thermistor of the radiation fin.
Malfunction Decision Conditions
When the temperature of the inverter radiation fin increases above 93°C.
Supposed Causes
Actuation of fin thermal (Actuates above 93°C)Faulty inverter PCBFaulty radiating fin thermistor
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
The radiation fin temp. rises to over
87°C.
YES
NO
Turn OFF the power supply, and then make measurement of resistance of the radiation fin thermistor.
Is the resistance of the thermistor
normal?
NO
YES
Connect and disconnect the radiation fin thermistor connector (X111A) to properly connect it.
Turn ON the power supply to start operation, and then check whether the malfunction recurs.
YES
NO
Faulty radiation of power unit• Blocked air inlet• Dirty radiation fin• High outdoor temperature
Replace the thermistor.
Replace the inverter PCB.
Continue the operation.The radiation fin temperature can have risen due to field factors. In this case, check for the following:
• Whether the radiation fin gets stained.
• Whether air flow is interrupted (due to dust or foreign matters) or the fan propeller gets damaged.
• Whether the outdoor air temperature is too high.
(Reference) Reset temperatures• LRMEQ5~20AY1, LRLEQ5~20AY1
Not more than 79°C for a period of one minute
Troubleshooting SiENBE28-901
116 Air Cooled Refrigeration Condensing Unit
6.6.19 “L5” INV Compressor Instantaneous Overcurrent
RemoteControllerDisplay
L5
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
Malfunction is detected from the currents flowing in the power transistor.
Malfunction Decision Conditions
An overcurrent (59.1A) flows even instantaneously.
Supposed Causes
Faulty compressor coil (e.g. broken wire or insulation failure)Compressor startup failure (mechanical lock)Faulty inverter PCBSlugging of refrigerantAbrasion of sliding parts caused by wet operation due to faulty secondary equipment expansion valveFailure of oil return due to faulty on site piping workLiquid return caused by operation signal connection failure
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 117
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Power OFF
Is the stop valve open?
Is the compressor lead
wire normal?
YES
NO
YES
NO
Are wirings and wire connections
to the compressor normal?
YES
NO
The insulation resistance of the compressor is not more than
100kΩ
NO
YES
There is a broken wire in
the compressor coil.
NO
YES
Check4 (P.133)Is the power
transistor normal?
YES
NO
When restarting, the fault recurs.
YES
NO
Power OFF Replace the inverter PCB (A3P).
When restarting, the fault recurs.
YES
NO
Open the stop valve.
Replace the compressor lead wire.
Correct the wirings and wire connections.
Replace the INV compressor.
Replace the INV compressor.
Replace the inverter PCB (A3P).
Continue the operation.Factors such as instantaneous power failure are supposed.
Continue the operation.
Replace the INV compressor.
Troubleshooting SiENBE28-901
118 Air Cooled Refrigeration Condensing Unit
6.6.20 “L8” INV Compressor Overload
RemoteControllerDisplay
L8
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
Malfunction is detected from the currents flowing in the power transistor.
Malfunction Decision Conditions
Currents on the secondary side of the inverter come to the following values.(1) Not less than 19A for a period of consecutive 5 seconds(2) Not less than 16.1A for a period of consecutive 260 seconds
Supposed Causes
Compressor overloadBroken wire in compressor coilDisconnection of compressor wiringFaulty inverter PCBSlugging of refrigerantAbrasion of sliding parts caused by wet operation due to faulty secondary equipment expansion valveFailure of oil return due to faulty on site piping workLiquid return caused by operation signal connection failure
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 119
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Power OFF
Is the stop valve open?
Is the compressor lead
wire normal?
YES
NO
YES
NO
Are wirings and wire connections to the
compressor normal?
YES
NO
The insulation resistance of the compressor is not more than
100kΩNO
YES
There is a broken wire in
the compressor coil.
NO
YES
Check4 (P.133)Is the power
transistor normal?
YES
NO
Open the stop valve.
Replace the compressor lead wire.
Correct the wirings and wire connections.
Replace the INV compressor.
Replace the INV compressor.
Replace the inverter PCB (A3P).
Connect the compressor lead wire, and then restart operation.
The malfunction "L8" recurs.
YES
NO
Is a difference between high pressure and low
pressure prior to restarting not more
than 0.2MPa?
YES
NO
Continue the operation.
Faulty pressure equalization in the refrigerant circuit
Check for compressor
Troubleshooting SiENBE28-901
120 Air Cooled Refrigeration Condensing Unit
6.6.21 “L9” Faulty INV Compressor Startup
RemoteControllerDisplay
L9
Applicable Models
LRMEQ5~20AY1LRLEQ5~20AY1
Method of Malfunction Detection
Malfunction is detected from the signal waveforms of the compressor.
Malfunction Decision Conditions
The compressor startup sequence is not complete.
Supposed Causes
Failure to open the stop valveFaulty compressorErroneous wire connections to compressorLarge differential pressure prior to compressor startupFaulty inverter PCBSlugging of refrigerantAbrasion of sliding parts caused by wet operation due to faulty secondary equipment expansion valveFailure of oil return due to faulty onsite piping workLiquid return caused by operation signal connection failureToo frequent on/off operation due to insufficient loading
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 121
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Check4 (P.133)Is the power
transistornormal?
Is the first time for the compressor to start after
installation?YES
NO
Is a proper amount of refrigerant
charged?
NO
YES
Is the stop valve open?
NO
YES
Refrigerant is slugging. (No power
is applied for a period of not less than 6
hours.)
YES
NO
Is the insulation resistance of compressor
maintained at not less than 100kΩ?
NO
YES
Is the compressor lead wire
disconnected?
YES
NO
Refrigerant is slugging. (No power
is applied for a period of not less than 6
hours.)
NO
YES
Is the insulation resistance of compressor
maintained at not less than 100kΩ?
NO
YES
There is a broken wire in
the compressor.YES
NO
Charge a proper amount of refrigerant.
Open the stop valve.
Eliminate the slugging of refrigerant.
Eliminate the slugging of refrigerant.
Connect the compressor lead wire.
Rectify, apply power, and then restart operation.Recheck for the compressor and the refrigerant circuit.
Eliminate the slugging of refrigerant.
Replace the INV compressor.
Replace the INV compressor.
Replace the compressor INV PCB (A3P).
Recheck the compressor and refrigerant system.
NO
YES
Troubleshooting SiENBE28-901
122 Air Cooled Refrigeration Condensing Unit
6.6.22 “LC” Malfunction of Transmission (between Inverter PCB and Main PCB)
RemoteControllerDisplay
LC
Applicable Models
LRMEQ5~20PY1LRLEQ5~20PY1
Method of Malfunction Detection
Check the communication state between the inverter PCB and the control PCB by micro-computer.
Malfunction Decision Conditions
When the correct communication is not conducted in certain period.
Supposed Causes
Faulty connection between the inverter PCB and the main PCBFaulty main PCB (transmission part)Faulty inverter PCBFaulty noise filterExternal factors (e.g. noises)Faulty INV compressorFaulty fan motor
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 123
Troubleshooting
*1. Connect and disconnect the connector to make sure it is securely connected.*2. List of types of inverter PCB
Applicable model TypeLRMEQ5~20AY1LRLEQ5~20AY1 PC0509-2(A)
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Is the connector connecting between
each control PCB and each inverter PCB
securely connected? (See *1)
YES
NO
Is the type of the inverter PCB correct?
(See *2)
YES
NO
The insulation resistance of the INV
compressor is not more than 100kΩ.
NO
YES
The insulation resistance of the fan
motor is not more than 1MΩ.
NO
YES
The micro controller normal monitor LED
(green) on the main PCB (A3P) is blinking.
YES
NO
The micro controller normal monitor LED
(green) on the inverter PCB is blinking.
YES
NO
The "LC"malfunction recurs.
NO
YES
Properly connect the connector.
Replace with a proper PCB.
Replace the INV compressor.
Replace the fan motor.
Not the "LC" malfunction. Recheck for the malfunction code.
Replace the inverter PCB.
Replace the outdoor unit main PCB (A1P).
Continue the operation.Factors such as instantaneous power failure are supposed.
Troubleshooting SiENBE28-901
124 Air Cooled Refrigeration Condensing Unit
6.6.23 “P1” Power Supply Voltage Imbalance
RemoteControllerDisplay
P1
Applicable Models
LRMEQ5~20PY1LRLEQ5~20PY1
Method of Malfunction Detection
Malfunction is detected from the voltage imbalance from the PCB.
Malfunction Decision Conditions
The power supply voltage causes an imbalance of not less than approx.14V?Continue operation without deciding the malfunction.
Supposed Causes
Open phaseVoltage imbalance between phasesFaulty main circuit capacitorFaulty inverter PCBFaulty K2MFaulty main circuit wiring
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Imbalance in supplied voltage is in excess of 14 V
(Y1). ∗1
YES
NO
Open phase?YES
NO
Is the voltage imbalance applied to the inverter in excess
of 14 V (Y1)? ∗2
YES
NO <When voltage monitoring is possible:>
Using a device capable of constant recording of power supply voltage record power supply voltage between 3 phases (L1 ~ L2, L2 ~ L3, L3~L1) for about one continuous week.
No abnormalities are observed in the power supply, but the imbalance in voltage recurs.
Power supply voltage imbalance
measure
Explanation for users ∗In accordance with "notification of inspection results" accompanying spare parts.
Give the user a copy of "notification of inspection results" and leave it up to him to improve the imbalance.
Be sure to explain to the user that there is a "power supply imbalance" for which DAIKIN is not responsible.
∗1. Measure voltage at the X1M power supply terminal block.
∗2. Measure voltage at terminals RED, BLACK and WHITE wires of the diode module inside the inverter while the compressor is running.
Open phaseNormalize field cause.
Fix power supply voltage imbalance.
Part or wiring defectAfter turning the power supply OFF, check and repair the main circuit wiring or parts.(1) Loose or disconnected
wiring between power supply and inverter
(2) K2 contact disposition, fusion or contact is poor.
(3) Loose or disconnected noise filter
Replace the inverter PCB.
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 125
6.6.24 “P4” Faulty Radiation Fin Thermistor
RemoteControllerDisplay
P4
Applicable Models
LRMEQ5~20PY1LRLEQ5~20PY1
Method of Malfunction Detection
While the compressor stops running, detect the resistance of the radiation fin thermistor.
Malfunction Decision Conditions
The thermistor resistance comes to a value equivalent to an open or a short circuit.
Supposed Causes
Faulty radiation fin thermistorFaulty inverter PCBFaulty INV compressorFaulty fan motor
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Make measurement of resistance of the radiation fin thermistor.
Is the resistance of the thermistor
normal? (See*1)
The insulation resistance of the INV
compressor is not more than 100kΩ.
NO
YES
YES
NO
The insulation resistance of the fan
motor is not more than 1MΩ.
YES
NO
Does the fault recur when turning ON the
power supply?
YES
NO
*1. Refer to the characteristics of radiation fin thermistor (P.106).
Replace the inverter PCB.
Replace the INV compressor.
Replace the fan motor.
Replace the inverter PCB.
Continue the operation.
Troubleshooting SiENBE28-901
126 Air Cooled Refrigeration Condensing Unit
6.6.25 “U1” Reverse Phase / Open Phase
RemoteControllerDisplay
U1
Applicable Models
LRMEQ5~20PY1LRLEQ5~20PY1
Method of Malfunction Detection
Make judgement by detecting the state of every phase in the reverse phase detection circuit.
Malfunction Decision Conditions
The power supply voltage has a reverse phase or the phase T is open.
Supposed Causes
Reverse phase of power supplyOpen phase T of power supplyFaulty outdoor unit PCB
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
The phase T is open at the power
supply terminal block (X1M) of the
outdoor unit.
YES
NO
YES
NO
Changing power supply cable connections
between phases enables normal operation.
Rectify the open phase.Need to check for a field power supply unit.
The power supply has a reverse phase.Change power supply cable connections
Replace the outdoor unit main PCB.
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 127
6.6.26 “U2” Abnormal Power Supply Voltage
RemoteControllerDisplay
U2
Applicable Models
LRMEQ5~20PY1LRLEQ5~20PY1
Method of Malfunction Detection
Malfunction is detected from the voltage of the main circuit capacitor in the inverter.
Malfunction Decision Conditions
When the voltage aforementioned is not less than 780V or not more than 320V, or when the current-limiting voltage does not reach 200V or more or exceeds 740V.
Supposed Causes
Power supply voltage dropInstantaneous power failureOpen phaseFaulty inverter PCBFaulty control box PCBFaulty compressorFaulty wiring in the main circuitFaulty fan motorFaulty connection of signal cable
Troubleshooting SiENBE28-901
128 Air Cooled Refrigeration Condensing Unit
Troubleshooting
CautionBe sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.
Check for power supply voltage. Voltage
between phases: 380 to 415V (Y1)
NOOnsite causes.Make proper wire connections without open phase, erroneous connections, or erroneous order of phases.
Power ON
Power OFF
Unbalanced power supply? (Not more than 2%: Phase voltage of not more than approx.
5V)
Disconnect the cable from the compressor, and then check
the compressor for the insulation resistance.
The insulation resistance is low. (i.e., not more than
100kΩ.)
Disconnect the cable from the fan, and then check the fan
motor for the insulation resistance.
The insulation resistance is low (i.e., not more than
1MΩ.)
Check the inverter power transistor.
Has the power transistor got faulty?
Check the fan driver power transistor.
Has the power transistor got faulty?
A
NO
YES
YES
YES
NO
YES
NO
YES
NO
YES
NO
Onsite causes.Correct the unbalanced loads to eliminate the unbalanced state.Unbalanced voltage will cause extremely unbalanced current, thus impairing the service life of or resulting in the malfunction of the equipment.
Replace the compressor.
Replace the fan motor.Replace the fan driver.
Replace the inverter PCB.I Observe the conditions of the
PCB.In the case of a serious failure, a compressor failure may cause the failure of the PCB. Even if the PCB is replaced, it may cause failure again.To avoid that, recheck the compressor for ground and for any broken wires. Furthermore, even after the completion of PCB replacement, check the compressor.
Replace the fan driver PCB.I Observe the conditions of the
PCB.
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 129
Check for connector connections: Remove and insert the connectors shown below. Furthermore, check the connectors for terminal conditions and continuity.RXQPAY1:• X1M power receiving terminal ⇔ X400A A2P• A2P X401A ⇔ X10A A3P• A1P X28A ⇔ X6A A3P• A3P X61A ⇔ X402A A2P• A3P X1A ⇔ X403A A2P• A3P P1, P2 ⇔ Reactor terminal L1R• A3P P3, N3 ⇔ P1, N1 A4P• A4P P2, N2 ⇔ P1, N1 A8P
A
NO
If any wiring has damage, replace the harness.
Power OFF
Power ON
Has the inverter PCB caused damage?
Has the fan driver caused damage?
Turn ON the power supply.
Stop (standby) before the fan rotates.
Stop (standby) when the compressor starts
up.
The “U2” malfunction recurs.
NO
NO
NO
NO
YES
YES
YES
YES
YESA3P: Replace the inverter PCB.∗ If the PCB replaced is badly
damaged, the compressor is likely to get faulty. To make sure, recheck the compressor.
A4P/A8P: Replace the fan driver PCB.
∗ If the PCB replaced is badly damaged, the fan motor is likely to get faulty. To make sure, recheck the compressor.
Recheck for the power supply. If there is no problem with the power supply, replace the A2P noise filter PCB.If the malfunction recurs, replace the inverter PCB.
Recheck for the power supply. If there is no problem with the power supply, replace the A3P inverter PCB.∗ If the PCB replaced is badly
damaged, compressor is likely to get faulty. To make sure, recheck the compressor.
Check the harness, and then replace it if necessary.
End of measures:I The malfunction may temporarily
result from onsite causes.Causes: Instantaneous power failure (open phase), noises, or else.
Troubleshooting SiENBE28-901
130 Air Cooled Refrigeration Condensing Unit
[Check 1] Check for Causes of Rise in High PressureReferring to the Fault Tree Analysis (FTA) shown below, identify faulty points.
Rise in high pressure
Partly rise in pressure
High piping resistance
Faulty outdoor unit electronic expansion valve
Faulty high pressure control
[In cooling]If the indoor unit electronic expansion valve is throttled:
[In frosting]If the outdoor unit electronic expansion valve is excessively throttled:
Faulty control
Abnormal if a temp. difference between inlet and outlet is over 10°C.
Faulty indoor unit electronic expansion valve
Faulty control
Suction air temperature of the condenser too high
Suction air temperature of the outdoor unit too high
Degradation in condensing capacity
Dirty condenser
Mixing of non- condensing gas
Drop in fan air volume
Drop in fan output
High air duct resistance
Refrigerant overcharged
Closed stop valve
Bended or crushed pipe
Clogged piping due to foreign matters
Faulty valve coil
Faulty valve body
Faulty high pressure sensor
Faulty outdoor unit main PCB
Faulty valve coil
Faulty valve body
Faulty high pressure sensor
Faulty indoor unit liquid pipe thermistor
Faulty outdoor unit main PCB
Short circuit
High ambient temp.
←Faulty fan motor
Faulty outdoor unit main PCB (including capacity setting)
Dirty filter
Obstacles
←Check to be sure that the stop valve is open.
←Visual check
←Check for any temp. difference before and after filter or branch piping.
←Is the coil resistance and the insulation normal? (See [Check 10])
←Are the voltage characteristics normal?
←Is the pressure value on the ServiceChecker matched to the measurement of sensor?
←Is the coil resistance and the insulation normal? (See [Check 10])
←Are the voltage characteristics normal?
←Is the connector properly connected?Are the thermistor resistance characteristics normal?
←Is the pressure value on the Service Checker matched to the measurement of sensor?
←Is the suction temp. not more than 43°C?
←Is the outdoor temp. not more than 43°C?
←Does the heat exchanger get clogged?
←Does air get mixed in the refrigerant circuit?
←Can the fan motor be rotated by hand?Is the resistance and insulation of motor coil normal?
←Is the capacity setting of spare PCB correct, if used?
←Does the air filter get clogged?
←Is there any obstacle in the air duct?
←See [Check 6].
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 131
[Check 2] Check for Causes of Drop in Low PressureReferring to the Fault Tree Analysis (FTA) shown below, identify faulty points.
Low pressure is too low. (Evaporating temp. is low)
[In cooling] If the indoor unit electronic expansion valve is excessively throttled:(See ∗3)
←Are the voltage characteristics normal?
Faulty low pressure control
(∗1)
(∗2)
Faulty compressor capacity control
Faulty low pressure protection control
Faulty indoor unit electronic expansion valve
Faulty controlFaulty
electronic expansion valve control
[In defrosting]If the outdoor unit electronic expansion valve is excessively throttled:(See ∗4)
Faulty outdoor unitelectronic expansion valve
Faulty control
Suction air temperature of the indoor unit too low
Faulty indoor unit suction air thermistor
Suction air temperature of the evaporator too low
High piping resistance
Low refrigerant circulation rate
Degradation in evaporating capacity
Refrigerant shortage
Moisture choke
Dirty evaporator
Drop in fan air volume
Faulty low pressure sensor
Faulty outdoor unit main PCB
Faulty low pressure sensor
Faulty outdoor unit main PCB
Faulty valve coil
Faulty valve body
Faulty indoor unit gas pipe thermistor
Faulty indoor unit liquid pipe thermistor
Faulty outdoor unit main PCB
Faulty valve coil
Faulty valve body
Faulty low pressure sensor
Faulty suction pipe thermistor
Faulty outdoor unit main PCB
Short circuit
Low ambient temp.
Abnormal piping length
Bended or crushed pipe
Clogged piping due to foreign matters
Stop valve closed
Drop in fan output
High air ductresistance
Faulty fan motor
Dirty filter
Faulty outdoor unit main PCB (including capacity setting)
Obstacles
←Is the pressure value on the Service Checker matched to the measurement of sensor?
←Are the voltage characteristics normal?
←Is the pressure value on the Service Checker matched to the measurement of sensor?
←Is the coil resistance and the insulation normal?
←Check for thermistor resistance and connector connection.
←Check for thermistor resistance and connector connection.
←Is the pressure value on the Service Checker matched to the measurement of sensor?
←Is the coil resistance and the insulation normal?
←Are the voltage characteristics normal?
←Check for thermistor resistance and connector connection.
←Does the suction air temps. fall in the "continuous operation range of inside temperature"?
←Does the inside temps. fall in the "continuous operation range"?
←Is the connector properly connected?Are the thermistor resistance characteristics normal?
←Does the piping length fall in the permissible range?
←Visual check
←Check for any temp. difference before and after filter or branch piping.
←Check to be sure that the stop valve is open.
←See [Check 6].
←Remove moisture by vacuum drying.
←Does the heat exchanger get clogged?
←Can the fan motor be rotated by hand?Is the resistance and insulation of motor coil normal?
←Is the capacity setting of spare PCB correct, if used?
←Does the air filter get clogged?
←Is there any obstacle in the air duct?
∗1. For the compressor capacity control in cooling, refer to information in "Compressor Control".∗2. "Low pressure protection control" includes low pressure drooping control.∗3. The indoor unit electronic expansion valve exerts "superheated degree control" in cooling.∗4. The outdoor unit electronic expansion valve (EV1) exerts "superheated degree control of outdoor unit heat exchanger" in defrosting.
Troubleshooting SiENBE28-901
132 Air Cooled Refrigeration Condensing Unit
[Check 3] Check for Causes of Overheat OperationReferring to the Fault Tree Analysis (FTA) shown below, identify faulty points.
Rise in discharge pipe temp.
[In cooling]If the indoor unit electronic expansion valve is excessively throttled:(See ∗2)
←Is the coil resistance and the insulation normal?
Faulty discharge pipe temp. control
Overheat of compressor
Faulty outdoor unit electronic expansion valve (EV3)
(See ∗1)
Faulty four-way valve operation
Overheat due to damage shaft
Overheat due to faulty compressor
Faulty indoor unit electronic expansion valve
Faulty control
Faulty outdoor unit electronic expansion valve
Faulty superheated degree control
Faulty control
[In defrosting]If the outdoor unit electronic expansion valve is excessively throttled: (See ∗3)
Refrigerant gas shortage
High piping resistance
Abnormal piping length
Bended or crushed pipe
(Including moisture choke)
Closed stop valve
Faulty subcoolelectronic expansionvalve
Faulty control
Four-way valve cut off halfway
Faulty valve coil
Faulty valve body
Faulty low pressure sensorFaulty thermistor at subcool heat exchanger outlet
Faulty outdoor unit main PCB
←Are the voltage characteristics normal?
←Is the connector properly connected?Are the thermistor resistance characteristics normal?
←Is the pressure value on the Service Checker matched to the measurement of sensor?
←Are the temperatures of pipes connected to the four-way valve normal?
←Is the coil resistance and the insulation normal?
Faulty valve coil
Faulty valve body
Faulty indoor unit gas pipe thermistor
Faulty indoor unit liquid pipe thermistor
Faulty outdoor unit main PCB
Faulty valve coil
Faulty valve body
Faulty low pressure sensorFaulty suction pipe thermistorFaulty outdoor unit main PCB
←Is the connector properly connected?Are the thermistor resistance characteristics normal?
←Is the connector properly connected?Are the thermistor resistance characteristics normal?
←Is the coil resistance and the insulation normal?
←Are the voltage characteristics normal?←Is the connector properly connected?
Are the thermistor resistance characteristics normal?
←Is the pressure value on the Service Checker matched to the measurement of sensor?
←See [Check 6].
←Does the piping length fall in the permissible range?
←Visual check
←Remove moisture by vacuum drying.
←Check to be sure that the stop valve is open.
∗1. For subcool electronic expansion valve control, refer to information in "Electronic expansion valve control".∗2. The indoor unit electronic expansion valve exerts "superheated degree control" in cooling.∗3. The outdoor unit electronic expansion valve (EV1) exerts "superheated degree control" in defrosting.∗4. Guideline for superheated degree by which a malfunction is judged as overheat operation
(1) Suction gas superheated degree: Not less than 10°C / (2) Discharge gas superheated degree: Not less than 45°C; provided, however, that superheated degrees immediately after startup or for drooping control are excluded.(The values aforementioned are just a guideline. Even if the values fall within the range shown above, these values may be normal depending on other conditions.)
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 133
[Check 4] Check for Power Transistor<LRMEQ5~20AY1, LRLEQ5~20AY1>
Checking failures in power semiconductors mounted on inverter PCBCheck the power semiconductors mounted on the inverter PCB by the use of a multiple tester.<Items to be prepared>
Multiple tester : Prepare the analog type of multiple tester.For the digital type of multiple tester, those with diode check function are available for the checking.
<Test points>Turn OFF the power supply. Then, after a lapse of 10 minutes or more, make measurement of resistance.
<Preparation>To make measurement, disconnect all connectors and terminals.
Inverter PCB
Electronic circuit
According to the checking aforementioned, it is probed that the malfunction results from the faulty inverter. The following section describes supposed causes of the faulty inverter.Faulty compressor (ground leakage)Faulty fan motor (ground leakage)Entry of conductive foreign particlesAbnormal voltage (e.g. overvoltage, surge (thunder), or unbalanced voltage)
In order to replace the faulty inverter, be sure to check for the points aforementioned.
J1
J2
J3
P1 P3 N3 U V W
X10AK2L1L2L3
J1J2
J3
DM P1 P2P3 IGBT
N3
U V WX11A
Troubleshooting SiENBE28-901
134 Air Cooled Refrigeration Condensing Unit
[Check 5] Check for Causes of Wet OperationReferring to the Fault Tree Analysis (FTA) shown below, identify faulty points.
Refrigerant accumulation
[In cooling]If the indoor unit electronic expansion valve excessively opens: (See ∗1)
←See [Check 6].
∗1. The indoor unit electronic expansion valve exerts "superheated degree control" in cooling.∗2. The outdoor unit electronic expansion valve (EV1) exerts "superheated degree control" in defrosting.∗3. Guideline for superheated degree by which a malfunction is judged as wet operation
(1) Suction gas superheated degree: Less than 3°C / (2) Discharge gas superheated degree: Less than 15°C; provided, however, that superheated degrees immediately after startup or for drooping control are excluded.(The values aforementioned are just a guideline. Even if the values fall within the range shown above, these values may be normal depending on other conditions.)
Excessive compressor ON-OFF
Refrigerant overcharge
Faulty superheated degree control
Faulty indoor unit electronic expansion valve
Faulty control
Faulty outdoor unit electronic expansion valve
Faulty control
Wet operation [In defrosting]
If the outdoor unit electronic expansion valve excessively opens: (See ∗2)
Dirty evaporator
Drop in air volume
Degradation in evaporating capacity
Faulty valve coil
Faulty valve body
Faulty indoor unit gas pipe thermistor
Faulty indoor unit liquid pipe thermistor
Faulty outdoor unit main PCB
Faulty valve coil
Faulty valve body
Faulty low pressure sensorFaulty suction pipe thermistorFaulty outdoor unit main PCB
Drop in fan output
High air duct resistance
Faulty fan motor
Faulty outdoor unit main PCB (including capacity setting)
Dirty filter
Obstacles
←Is the coil resistance and the insulation normal?
←Is the connector properly connected?Are the thermistor resistance characteristics normal?
←Is the connector properly connected?Are the thermistor resistance characteristics normal?
←Is the coil resistance and the insulation normal?
←Are the voltage characteristics normal?Is the connector properly connected?
←Are the thermistor resistance characteristics normal?
←Is the pressure value on the Service Checker matched to the measurement of sensor?
←Can the fan motor be rotated by hand?Is the resistance and insulation of motor coil normal?
←Does the heat exchanger get clogged?
←Does the air filter get clogged?
←Is there any obstacle in the air duct?
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 135
[Check 6] Check for Refrigerant AmountDue to relationship to pressure control and electronic expansion valve control, the refrigerant amount needs to be judged according to operating conditions.Refer to information shown below for making judgements.
Diagnosis of Refrigerant Overcharge1. High pressure becomes higher. Consequently, overload control is exerted to make the
capacity slightly inadequate.2. The superheated degree of suction gas becomes lower (or the system is put into wet
operation). Consequently, the compressor discharge pipe temperature becomes lower for pressure loads.
3. The subcooled degree of condensate becomes higher.
Diagnosis of Refrigerant Shortage1. The superheated degree of suction gas becomes higher, and the temperature of
compressor discharge gas also becomes higher.2. The superheated degree of suction gas becomes higher, and the electronic expansion valve
shifts to slightly open.3. Low pressure is too low to demonstrate cooling capacity (or heating capacity).4. The liquid level gauge falls into the flash state.
High pressure
Low pressure
Operating frequency
High pressure gradually rises with increasing operating frequency.
(Low pressure is maintained at a certain level.)
To maintain low pressure, operating frequency increases on the capacity control.
(Degree of overcharge)Proper amount Further overcharge
High pressure drooping controlOperating frequency comes to the lowest level.
Subcooled degree becomes higher. (The temperature of liquid connection piping becomes lower.)
Low pressure rises with lowering compressor output.
High pressure
Lowpressure
Operating frequency
The opening degree of the indoor unit electronic expansion valve comes larger.
Either electronic expansion valve fully opens.
Fan control, i.e., actually hunting to maintain high pressure on the cooling control with low outdoor air
Operating frequency comes to the lowest level.
(Low pressure is maintained at a certain level.)
High pressure increases due to compressor capcity decreasing.
Low pressure rises with increasing opening degree of the indoor unit electronic expansion valve, and the operating frequency slightly increases due to the capacity control.
If the operating frequency reaches the lowest level, low pressure cannot be maintained.
To maintain low pressure, operating frequency increases on the capacity control.
(Degree of refrigerant shortage)Proper amount Further short
Troubleshooting SiENBE28-901
136 Air Cooled Refrigeration Condensing Unit
[Check 7] Vacuum Drying ProcedureTo conduct vacuum drying in the piping system, follow the procedure for <Normal vacuum drying> shown below.Furthermore, if moisture can get mixed in the piping system, follow the procedure for <Special vacuum drying> shown below.
<Normal vacuum drying>1. Vacuum drying
• Use a vacuum pump that enables vacuuming to a vacuum level of -100.7kPa (5 torr, -755 mmHg).
• Connect a manifold gauge to the service port of the liquid pipe and the gas pipe respectively, and then run the vacuum pump for a period of two or more hours to achieve vacuuming to a vacuum level below -100.7kPa.
• If the vacuum level does not reach below -100.7kPa even after vacuuming for a period of two hours, moisture has got mixed in the system or the system has caused vacuum leakage. Consequently, conduct vacuuming for a period of another one hour.
• If the vacuum level does not reach below -100.7kPa even after vacuuming for a period of three hours, conduct leak tests.
2. Leaving in vacuum state• Leave the piping system in a vacuum state at a level below -100.7kPa for a period of one
or more hours, and then check to be sure that the vacuum gauge reading does not rise. (If the reading rises, moisture remains in the system or vacuum leaks from the piping.)
3. Additional refrigerant charge• Purge air from the hose connected to the manifold gauge, and then charge a necessary
amount of refrigerant.<Special vacuum drying> - In case moisture can get mixed in the piping*:1. Vacuum drying
• Follow the same procedure as that for normal vacuum drying 1 aforementioned.2. Vacuum break
• Pressurize to 0.05MPa using nitrogen gas.3. Vacuum drying
• Conduct vacuum drying for a period of one or more hours. If the vacuum level does not reach below -100.7kPa even after vacuuming for a period of two hours, repeat Steps 2 Vacuum break and Step 3 Vacuum drying.
4. Leaving in vacuum state• Leave the piping system in a vacuum state at a level below -100.7kPa for a period of one
or more hours, and then check to be sure that the vacuum gauge reading does not rise.5. Additional refrigerant charge
• Purge air from the hose connected to the manifold gauge, and then charge a necessary amount of refrigerant.*Dew may condense in the piping due to construction during rainy season or a long construction period or rainwater may enter the piping during construction.
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 137
[Check 8] List of Malfunction Codes Related to Inverter
Code Name Condition for determining malfunction Major faulty point
Com
pres
sor c
urre
nt
L5INV Compressor Instantaneous Overcurrent
Inverter output causes an overcurrent to flow even instantaneously.
Inverter getting caught in liquidFaulty compressorFaulty inverter PCB
L8Overcurrent of INV compressor (electronic thermal)
The compressor performs overload operation.Loss of synchronization is detected.
Liquid back of compressorSharp change in loadDisconnection of compressor wiringFaulty inverter PCB
Pro
tect
ion
devi
ce, e
tc.
L1 Faulty Inverter PCB No output is produced. Faulty heavy current part of inverter
L9Faulty INV Compressor Startup
The compressor motor fails to start up.
Inverter getting caught in liquid or faulty compressorExcessive oil or refrigerantFaulty inverter PCB
E5 Inverter Compressor Lock The compressor is in locked state (does not rotate). Faulty compressor
L4Rise in Radiation Fin Temperature
The radiation fin temperature exceeds the reference value (while in operation).
Malfunction of fanLong-term overload operationFaulty inverter PCB
U2Abnormal Power Supply Voltage
The inverter power supply voltage is high or low.
Abnormal power supplyFaulty inverter PCB
P1 Power Supply Imbalance The three-phase power supply has a significant voltage imbalance.
Abnormal power supply (Power supply imbalance of not less than 2%)Faulty inverter PCBEnd of PCB service life
LC
Malfunction Related to Transmission (between Main PCB and Control PCB)
The outdoor unit PCB cannot make communications among the control PCB, inverter PCB, and fan PCB.
Broken wire in communication lineFaulty control PCBFaulty inverter PCBFaulty fan PCB
P4 Faulty fin thermistor The fin thermistor gets short-circuited or open. Faulty fin thermistor
Troubleshooting SiENBE28-901
138 Air Cooled Refrigeration Condensing Unit
[Check 9] Temperature and Resistance Characteristics of ThermistorOutdoor unit
Applicable Heat exchanger(Inlet and outlet) Suction air Discharge pipe Radiation fin
Type ST0601 ST0602 ST0901 PTP-46D-D1Temperature(°C) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ) Resistance(kΩ)
-10 112.0 10.9 1403.8 111.4-5 85.5 8.6 1059.5 84.10 65.8 6.9 806.5 64.15 51.1 5.5 618.9 49.410 40.0 4.4 487.8 38.415 31.6 3.6 373.1 30.120 25.1 2.9 292.9 23.825 20.1 2.4 231.4 18.930 16.2 2.0 184.1 15.235 13.1 1.6 141.1 12.340 10.7 1.4 118.7 10.045 8.8 1.1 96.1 8.250 7.2 1.0 78.3 6.855 6.0 0.82 64.1 5.660 5.0 0.70 52.8 4.765 4.2 0.60 43.6 3.970 3.5 0.51 36.3 3.375 3.0 0.44 30.3 2.880 2.5 0.38 25.4 2.485 2.1 0.33 21.4 2.090 1.8 0.29 18.1 1.795 1.6 0.25 15.3 1.5
100 1.4 0.22 13.1 1.3105 1.2 0.20 11.2 1.1110 1.0 0.17 9.6 1.0115 0.9 0.15 8.3 0.9120 0.8 0.14 7.1 0.8
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 139
[Check 10] Voltage Characteristics of Pressure SensorPH = 1.38VH–0.69PL = 0.57VL–0.28
PH : High pressure (MPa)PL : Low pressure (MPa)
VH : Output voltage [High pressure side] VDCVL : Output voltage [Low pressure side] VDC
Pressure detectedPH, PL
(kg/cm2) MPa51.0 5.0
45.9 4.5
40.8 4.0
35.7 3.5
30.6 3.0
25.5 2.5
20.4 2.0
15.3 1.5
10.2 1.0
5.1 0.5
-5.1 -0.5
0
High pressure (PH)
(1.7MPa) Low pressure (PL)
-0.5 0 0.5 1 1.5 2 2.5 3 3.5 4VDCOutput voltage (VH, VL)
Troubleshooting SiENBE28-901
140 Air Cooled Refrigeration Condensing Unit
Characteristics of Refrigerant and Psychrometric ChartCharacteristics of Refrigerant R-410A
0.00
510
015
020
025
030
035
040
045
0
Ent
halp
y kJ
\kg
5050
055
060
065
0
0.01
0.02
0.05
0.1
0.2
0.5
1.0
2.0
5.0
10.0
20.0
0.0007m3/kg
0.00075m3/kg
0.0008m3/kg
0.00085m3/kg
0.0009m3/kg 0.00095m3/kg 0.001m3/kg
0.001
10.
0012
0.00
130.
0014
0.00
150.
002
m3/k
g
0.00
5m
3 /kg 0.01
m3 /
kg
0.02
m3 /k
g
0.05
m3 /
kg
0.1
m3 /
kg
0.2
m3 /
kg
0.5
m3 /
kg
1m
3 /kg
2m
3 /kg
5m
3 /kg
10m
3 /kg
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
1.0
2.0kJ/(kg•k)
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0kJ/(kg•k)
0.9
0.8
0.7
0.6
0.5kJ/(kg •k)-100°C
x=0.0 -90
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
-80
-70
-60
-40
-30
-20
-10
0°C
10
20
30
40
50°C
60
-50°
C
7080
9010
0°C11
0120
130
140
150°
C160
170
180
190
200°
C
Pressure MPa
R-4
10A
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 141
6.7 Maintenance1. Procedure for Removal of Parts from Refrigerant System
As the results of checking a malfunction, if the malfunction results from part(s) used in the refrigerant system, remove the part(s) referring to the procedure for refrigerant recovery shown below.
∗ If liquid refrigerant was recovered, add refrigeration oil according to the following criteria.Refrigeration oil brand: Idemitsu DAPHNE FVC68DAmount to be added: Volume of recovered refrigerant (kg) x 0.05 liter(Example: If the volume of the refrigerant recovered is 24kg, 24 x 0.05 = 1.2 liter of oil that should be added.)Fill port: Liquid stop valve service port
For details about adding oil, see the section that describes the refrigeration oil procedure.
Location of malfunction Procedure for maintenance
1
Outdoor unit compressors (M1C, M2C and M3C)Solenoid valves (for STD1 and STD2)INV electronic expansion valveFour way valveHigh pressure switches
Refer to Maintenance 1.
2Main electronic expansion valveInjection electronic expansion valve
Refer to Maintenance 2.
3Secondary equipment, such as a showcaseDryer
Refer to Maintenance 3.
4High pressure sensorLow pressure sensor
A check valve allows it to be removed and replaced without any refrigerant recovery.
Troubleshooting SiENBE28-901
142 Air Cooled Refrigeration Condensing Unit
1) Maintenance 1: Maintenance related to outdoor unit compressor
No continuous operations allowed
1. Turn off the operation switch for the outdoor unit. After the outdoor unit has stopped, turn off the power supply for the outdoor unit.
2. Remove the control box.3. Close the stop valves in the order: A, D and then B.4. Recover the refrigerant in the compressor through service ports a, b and maintenance
valves A and B. ( shaped region.)
∗ After replacing the compressor, check whether the dryer is WET or DRY using the moisture indicator. If it is WET, replace the dryer.
5. Conduct air tight checks.6. Conduct vacuuming through the service port b, and the maintenance valve A and B.
(If the oil needs to be added, charge it through the service port a.)7. Turn on the power supply for the outdoor unit. Then turn on the operation switch for the
outdoor unit.(If a remote controller switch is used, enable the remote setting.)
8. Charge the refrigerant by the same quantity as that recovered.
Applicable parts • Compressors (M1C, M2C and M3C)• Solenoid valves (STD1 and STD2)• INV electronic expansion valve• Four way valve• High pressure switch
1 compressor
HPSL
HPS1D
a
CB
A
b
HP
Td1
INV
EV2
TLc EV1
Tg
LP
Tce
A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valveD: Gas stop valve a, b, c: Service ports
Repair or replace the applicable parts.
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 143
No continuous operations allowed
1. Turn off the operation switch for the outdoor unit. After the outdoor unit has stopped, turn off the power supply for the outdoor unit.
2. Remove the control box.3. Close the stop valves in the order: A, D and then B.4. Recover the refrigerant in the compressor through service ports a, b and maintenance
valves A and B. ( shaped region.)
∗ After replacing the compressor, check whether the dryer is WET or DRY using the moisture indicator. If it is WET, replace the dryer.
5. Conduct air tight checks.6. Conduct vacuuming through the service port b, and the maintenance valve a and B.
(If the oil needs to be added, charge it through the service port A.)7. Turn on the power supply for the outdoor unit. Then turn on the operation switch for the
outdoor unit.(If a remote controller switch is used, enable the remote setting.)
8. Charge the refrigerant by the same quantity as that recovered.
Applicable parts • Compressors (M1C, M2C and M3C)• Solenoid valves (STD1 and STD2)• INV electronic expansion valve• Four way valve• High pressure switch
2 compressors
HPSL
HPS1
Da
C
B
A
b
HP
Td1
INV
EV2
TLc
EV1
Tg
LP
Tce
HPS2
Td2
EV3 SV2
Ta
STD1
A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valveD: Gas stop valve a, b, c: Service ports
Repair or replace the applicable parts.
Troubleshooting SiENBE28-901
144 Air Cooled Refrigeration Condensing Unit
No continuous operations allowed
1. Turn off the operation switch for the outdoor unit. After the outdoor unit has stopped, turn off the power supply for the outdoor unit.
2. Remove the control box.3. Close the stop valves in the order: A, D and then B.4. Recover the refrigerant in the compressor through service ports a, b and maintenance
valves A and B. ( shaped region.)
∗ After replacing the compressor, check whether the dryer is WET or DRY using the moisture indicator. If it is WET, replace the dryer.
5. Conduct air tight checks.6. Conduct vacuuming through the service port b, and the maintenance valve a and B.
(If the oil needs to be added, charge it through the service port A.)7. Turn on the power supply for the outdoor unit. Then turn on the operation switch for the
outdoor unit.(If a remote controller switch is used, enable the remote setting.)
8. Charge the refrigerant by the same quantity as that recovered.
Applicable parts • Compressors (M1C, M2C and M3C)• Solenoid valves (STD1 and STD2)• INV electronic expansion valve• Four way valve• High pressure switch
3 compressors
HPSL
HPS1
Da
C
B
Ab
HP
Td1
INV
EV2
TL
c
EV1Tg
LP
Tce
HPS3
Td2EV3
SV2
Ta
HPS2
SV3
Td3
STD1 STD2
A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valveD: Gas stop valve a, b, c: Service ports
Repair or replace the applicable parts.
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 145
2) Maintenance 2: Maintenance of EV1 and EV2
No continuous operations allowed
1. Turn off the operation switch for the outdoor unit. After the outdoor unit has stopped, turn off the power supply for the outdoor unit.
2. Remove the control box.3. Close the stop valves in the order: C and D.4. Recover the refrigerant in the compressor through service ports c, b. ( shaped region.)
∗ After replacing parts, check whether the dryer is WET or DRY using the moisture indicator. If it is WET, replace the dryer.
5. Conduct air tight checks.6. Conduct vacuuming through the service port c and b.
(Then charge the refrigerant according to the quantity as that recovered. And then continue vacuuming.)
7. Turn on the power supply for the outdoor unit. Then turn on the operation switch for the outdoor unit.(If a remote controller switch is used, enable the remote setting.)
8. Charge the refrigerant by the same quantity as that recovered.
Applicable parts • Main electronic expansion valve• Injection electronic expansion valve1 compressor
HPSL
HPS1D
a
CB
A
b
HP
Td1
INV
EV2
TLc EV1
Tg
LP
Tce
A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valveD: Gas stop valve a, b, c: Service ports
Repair or replace the applicable parts.
Troubleshooting SiENBE28-901
146 Air Cooled Refrigeration Condensing Unit
No continuous operations allowed
1. Turn off the operation switch for the outdoor unit. After the outdoor unit has stopped, turn off the power supply for the outdoor unit.
2. Remove the control box.3. Close the stop valves in the order: C and D.4. Recover the refrigerant in the compressor through service ports c, b. ( shaped region.)
∗ After replacing parts, check whether the dryer is WET or DRY using the moisture indicator. If it is WET, replace the dryer.
5. Conduct air tight checks.6. Conduct vacuuming through the service port c and b.
(Then charge the refrigerant according to the quantity as that recovered. And then continue vacuuming.)
7. Turn on the power supply for the outdoor unit. Then turn on the operation switch for the outdoor unit.(If a remote controller switch is used, enable the remote setting.)
8. Charge the refrigerant by the same quantity as that recovered.
Applicable parts • Main electronic expansion valve• Injection electronic expansion valve2 compressors
HPSL
HPS1
Da
C
B
A
b
HP
Td1
INV
EV2
TLc
EV1
Tg
LP
Tce
HPS2
Td2
EV3 SV2
Ta
STD1
A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valveD: Gas stop valve a, b, c: Service ports
Repair or replace the applicable parts.
SiENBE28-901 Troubleshooting
Air Cooled Refrigeration Condensing Unit 147
No continuous operations allowed
1. Turn off the operation switch for the outdoor unit. After the outdoor unit has stopped, turn off the power supply for the outdoor unit.
2. Remove the control box.3. Close the stop valves in the order: C and D.4. Recover the refrigerant in the compressor through service ports c, b. ( shaped region.)
∗ After replacing parts, check whether the dryer is WET or DRY using the moisture indicator. If it is WET, replace the dryer.
5. Conduct air tight checks.6. Conduct vacuuming through the service port c and b.
(Then charge the refrigerant according to the quantity as that recovered. And then continue vacuuming.)
7. Turn on the power supply for the outdoor unit. Then turn on the operation switch for the outdoor unit.(If a remote controller switch is used, enable the remote setting.)
8. Charge the refrigerant by the same quantity as that recovered.
Applicable parts • Main electronic expansion valve• Injection electronic expansion valve3 compressors
HPSL
HPS1
Da
C
B
Ab
HP
Td1
INV
EV2
TLc
EV1Tg
LP
Tce
HPS3
Td2EV3
SV2
Ta
HPS2
SV3
Td3
STD1 STD2
Tg
A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valveD: Gas stop valve a, b, c: Service ports
Repair or replace the applicable parts.
Troubleshooting SiENBE28-901
148 Air Cooled Refrigeration Condensing Unit
3) Maintenance 3: Maintenance of showcase and dryer
No continuous operations allowed
1. Close the stop valve C to conduct pump down operation.(The compressor will automatically stop or the pump down operation will be conducted for a period of 10 minutes.)
2. Turn off the operation switch for the outdoor unit. After the outdoor unit has stopped, turn off the power supply for the outdoor unit.
3. Remove the control box.4. Close the stop valves in the order: C and D.5. Recover the refrigerant in the compressor through the liquid stop valve C and gas stop valve
D. ( shaped region.)
6. Conduct air tight checks.7. Conduct vacuuming through the liquid stop valve C and gas stop valve D.8. Turn on the power supply for the outdoor unit. Then turn on the operation switch for the
outdoor unit.(If a remote controller switch is used, enable the remote setting.)
9. Charge the refrigerant by the same quantity as that recovered with a charging cylinder.
Applicable parts • Main electronic expansion valve• Injection electronic expansion valve1 compressor
HPSL
HPS1D
a
CB
A
b
HP
Td1
INV
EV2
TLc EV1
Tg
LP
Tce
A: Discharge line maintenance valve B: Injection line maintenance valve C: Liquid stop valveD: Gas stop valve a, b, c: Service ports
Repair or replace the applicable parts.
SiENBE28-901 Appendix (Supplementary Information)
Air Cooled Refrigeration Condensing Unit 149
7. Appendix (Supplementary Information)7.1 Restriction Matter of Showcase
• The design pressure of the indoor unit must be 2.5MPa.• Install an R410A mechanical thermostatic expansion valve on eachlindoor unit.• Install an R410A solenoid valve (Max. operating differential pressure of 3.5 MPa (35 bars) or
over) on the primary side of the mechanical thermostatic expansion valve described above for each indoor unit.
• Install a filter on the primary side of the solenoid valve described above for each indoor unit.Determine the filter mesh count based on the size specified by the solenoid valve and mechanical thermostatic expansion valve being used.
• Route the path to the indoor unit heat exchanger so that the flow or refrigerant is from top to bottom.
• Wlhen installing a number of indoor units, be sure to install them at the same level.Difference in height between indoor units to be 5m or less.
• Use either off-cycle defrosting or electric heater defrosting as the defrostingltype.Hot-gas defrosting models cannot be used.
7.2 Selection of Expansion Valve• The expansion valve must use made of the Danfoss.• EEV (On/Off switching electric expansion valve) cannot be used.
Mechanicalthermostatic expansion valve
Liquid solenoidFilter
Flow of refrigerant
Evaporator outlet
Evaporator inlet
Evaporator inlet
Evaporator inlet
Evaporator outlet
Evaporator outlet
Appendix (Supplementary Information) SiENBE28-901
150 Air Cooled Refrigeration Condensing Unit
7.3 Trouble Case with Present Machine (R-407C)Compressor damage due to the overcharge of refrigerant in the field
CauseBy mistake, a local installer added 1.3 times of the total refrigerant, not 1.3 times of the additional charging refrigerant which is specified in the Installation Manual.(It is already explained in the service news #MJ-08023. See the next page for more details.)
Prevention of new modelsNew models have improved compressor reliability by countermeasure control functions of current models. Also, the amount of the additional charging refrigerant at the field specified up to 0.1 times only.
Req
uest
for t
he in
dica
tion
of a
dditi
onal
refri
gera
nt c
harg
ing
amou
nt a
nd in
stal
latio
n da
te*B
e su
re to
fill
the
blan
ks, w
hich
are
nee
ded
for a
fter-
sale
ser
vice
s.
Ple
ase
calc
ulat
e th
e am
ount
of a
dditi
onal
refri
gera
nt c
harg
ing
as fo
llow
ing
met
hod.
(1)B
y pi
ping
leng
th o
f sys
tem
Ple
ase
calc
ulat
e fro
m th
e to
tal l
engt
h of
the
liqui
d pi
pes.
Cal
cula
te th
e to
tal p
ipin
g le
ngth
of e
ach
size
as
follo
ws.
(2)B
y co
nnec
ting
show
case
Ple
ase
calc
ulat
e fro
m th
e ca
paci
ty o
f the
con
nect
ed s
how
case
as
belo
w ta
bles
.
(3)C
onst
ant
Add
con
stan
t am
ount
by
outd
oor u
nit m
odel
Full o
f liq
uid
A few
bu
bbles
flo
w.
Sea
led
stat
e (
)S
horta
ge o
f ref
riger
ant (5
)
Bubb
les
com
e ou
t at
all t
imes
.
(A)
(B)
Man
ufac
ture
's la
bel
valu
e
(A)+
(B)
Tota
l add
ition
al
char
ging
am
ount kg
Cha
rgin
g am
ount
(F
acto
ry s
et)
kg
Tota
l am
ount
of
refri
gera
ntkg
Tota
l len
gth
of
φ15.
9 liq
uid
pipe
s+
Tota
l len
gth
of
φ12.
7 liq
uid
pipe
s–
Tota
l len
gth
of
φ9.5
liqu
id p
ipes
–C
harg
ing
amou
nt
by p
ipin
g le
ngth
(m)×
0.19
(m)×
0.12
(m)×
0.06
(1)
kg
Cap
acity
of s
how
case
(*
Not
e.)
Am
ount
of r
efrig
eran
tS
how
case
Blow
er
coil
MT
LTle
ss th
an 5
kW1.
1kg
1.4k
g0.
6kg
From
5kW
to le
ss th
an 10
kW2.
3kg
3.2k
g1.
2kg
From
10kW
to le
ss th
an 15
kW3.
4kg
5.2k
g1.
7kg
From
15kW
to le
ss th
an 20
kW4.
6kg
2.3k
gFro
m 20
kW to
less
than
25kW
5.9k
g3.
0kg
From
25kW
to le
ss th
an 30
kW7.
0kg
3.5k
gFro
m 30
kW to
less
than
35kW
8.2k
g4.
1kg
From
35kW
to le
ss th
an 40
kW9.
7kg
4.9k
g40
kW o
r mor
e11
.0kg
5.5k
g
Capa
city o
f sh
owca
se kW+
Capa
city o
f bl
ower
coi
lkW
–
Cha
rgin
g am
ount
by
con
nect
ing
show
case
Amou
nt o
f re
frige
rant kg
Am
ount
of
refri
gera
nt kg
(2)
kg
Con
stan
t(3
)kg
Cha
rgin
g am
ount
by
adj
ustm
ent
(4)
kg
Out
door
uni
tA
mou
nt o
f re
frige
rant
LRLE
Q5, 6
AY1•L
RMEQ
5, 6A
Y11.
0kg
LRLE
Q8~1
2AY1
•LRME
Q8~1
2AY1
3.0k
gLR
LEQ1
5~20A
Y1•LR
MEQ1
5~20A
Y13.
5kg
*Not
e)1.
Cas
e of
sho
wca
se th
e co
nditi
on o
f cap
acity
(e
vapo
ratin
g te
mpe
ratu
re)
MT
(Med
ium
te
mpe
ratu
re):
–10°
CLT
(Low
tem
pera
ture
):–3
5°C
2.C
ase
of b
low
er c
oil,
the
cond
ition
of c
apac
ity is
10
°C (T
d).
(1)+
(2)+
(3)+
(4)
(4)B
y ad
just
men
t(W
hen
the
liqui
d ey
e sh
ows
shor
tage
of
refri
gera
nt.)
Whe
n te
st ru
nnin
g, a
dd re
frige
rant
if th
e liq
uid
eye
not b
e in
sea
ling
stat
es a
t co
olin
g op
erat
ion.
(4)B
y ad
just
men
t ≤
(2)
By
conn
ectin
g sh
owca
se ×
0.1
Do
not b
e ov
er 1
0% o
f (2)
am
ount
by
conn
ectin
g sh
owca
se.
3P25
1593
-1A
SiENBE28-901 Appendix (Supplementary Information)
Air Cooled Refrigeration Condensing Unit 151
Secret
<Convenience-pack>Re-precaution: Hard-and-fast additional refrigerant charge in commissioning
LRLCP14D1, 2 and all other convenience-pack models
PRModel
This is to inform you again of the precaution (MJ06053) "For additional charge in a commissioning of Conveni-pack, the upper limit shall be 1.3 times as much as that calculated." Because there was a compressor failure caused by over charge that is assumed to be due to a miscalculation.
[Case example]At the time of calculation of the upper limit of additional charge, "Initial charge in outdoor unit" was added.After the refrigerant was charged by the calculated upper limit above, the over charge "4.29kg (30% of 14.3kg of the initial charge in the outdoor unit)" caused the compressor failure.
[Upper limit of additional refrigerant charge in commissioning]Correct [Additional charge in the field (Calculated value depending on piping length) ] × 1.3
Wrong [Charge at factory + Additional charge in the field (Calculated value depending on piping length) ] × 1.3Example: Additional charge (Calculated value) :15kg The upper limit of additional charge : 19.5kg (15 × 1.3=19.5)
[Precaution for charging refrigerant]For additional charge, please do not charge the upper limit of refrigerant at a time.When charging refrigerant more than additional charge in the field (calculated value), please charge refrigerant while observing through a sight glass.A few bubbles are not problem. So please keep strictly the upper limit of additional refrigerant charge (This unit performs an oil return irregularly by on-off operation of a solenoid valve. Some transiently-generated flashes during the solenoid valve operation are not problem.)
MJ–08023
When a solenoid valve is turned onin sealed condition → Flashes appear
Even though a solenoid valve is turned off, flashes sometimes appear.
Solenoid valve OFF (Sealed condition)
Solenoid ON (Flashes appear) Solenoid valve After OFF (Just before sealed condition)
Appendix (Supplementary Information) SiENBE28-901
152 Air Cooled Refrigeration Condensing Unit
Method of removed and replaced compressor in fieldThis system’s compressor has gas injection pipe. When you replace the compressor, you must remove the piping fixture with gas injection pipe.Please follow the procedure, replace the compressor.
Recommended tool for removed the screwRatchet socket wrench Spanner Driver(+)
Tool
Expect the flat type Only small size type Only short-shank type
Gas injection pipe
Suctionpipe
Discharge pipe
Arrow viewMethod removed piping fixture for gas injection pipe
(1) Insert the tool from behind the compressor, remove the hexagon head screw (A) and tube fixture (C).On the other screw (B), slacken it.
(2) Turn the piping fixture on a point of tube holder (D), fold it toward.
(3) Cut the pipe for compressor with pipe-cutter.
M5 Hexagon head screw (A)Tube holder (C)
Piping fixture (stainless-steel)
Tube holder (D)
M5 Hexagon head screw (B)
View
Turn the piping fixture
Cutting point
Tube holder (D)
SiENBE28-901 Appendix (Supplementary Information)
Air Cooled Refrigeration Condensing Unit 153
Installation of alarm
(Case example)
Because the unit stopped abnormally, and the temperature in the storage had risen, goods preserved on the inside were deteriorated.
(Cause)
The abnormal stop occurred because of the problem of the unit, and they display the abnormal signal. However the distant location of the unit and lacking of the alarming system allow the damage spreads.
Solution:The following matters must be accepted by the customer at installation.
• Any secondary damage (such as deterioration and corrosion of the goods in the unit) is not covered by the manufacturer's warranty.
• Temperature control is the responsibility of the customer.
Please consider installing the alarming systems and spare units to minimize the damage. According to the circumstances, we recommend to arrange the damage insurance or after the sales service.
The unit is provided with a terminal to output an alarm signal.If the system should malfunction and there is no alarm,the operation of the unit will be interrupted for a long time and damage to the commodities in storage may result.The installation of an alarm is recommended in order to take appropriate measures promptly in such cases.For details,consult your dealer.
Appendix (Supplementary Information) SiENBE28-901
154 Air Cooled Refrigeration Condensing Unit
7.4 Option List
Note) H: Order products
Series CONDENSING UNIT FOR REFRIGERATION SYSTEMModel LRLEQ5AY1
LRLEQ6AY1
LRMEQ5AY1LRMEQ6AY1
LRLEQ5AY1ELRLEQ6AY1E
LRMEQ5AY1ELRMEQ6AY1E
LRLEQ8AY1LRLEQ10AY1LRLEQ12AY1
LRMEQ8AY1LRMEQ10AY1LRMEQ12AY1
LRLEQ8AY1ELRLEQ10AY1ELRLEQ12AY1E
LRMEQ8AY1ELRMEQ10AY1ELRMEQ12AY1E
LRLEQ15AY1LRLEQ20AY1
LRMEQ15AY1LRMEQ20AY1
LRLEQ15AY1ELRLEQ20AY1E
LRMEQ15AY1ELRMEQ20AY1E
Option nameCentral drain pan kit KWC26C160 HKWC26C160E KWC26C280 HKWC26C280E KWC26C450 HKWC26C450E
ISO14001 assures an effective environmentalmanagement system in order to help protect human healthand the environment from the potential impact of ouractivities, products and services and to assist inmaintaining and improving the quality of the environment.
Daikin Europe N.V. is approved by LRQA for its QualityManagement System in accordance with the ISO9001standard. ISO9001 pertains to quality assurance regardingdesign, development, manufacturing as well as to servicesrelated to the product.
Daikin units comply with the European regulations thatguarantee the safety of the product.
SiEN
BE28
-901
• 09
/2009
• Co
pyrig
ht Da
ikin
Prep
ared
in B
elgium
by La
nnoo
(ww
w.lan
noop
rint.b
e), a
comp
any w
hose
conc
ern f
orthe
envir
onmo
nt is
set in
the E
MAS
and I
SO 14
001 s
ystem
s. Re
spon
sible
Edito
r: Da
ikin E
urop
e N.V
., Zan
dvoo
rdes
traat
300,
B- 84
00 O
osten
de
The present publication is drawn up by way of information only and does notconstitute an offer binding upon Daikin Europe N.V.. Daikin Europe N.V. hascompiled the content of this publication to the best of its knowledge. Noexpress or implied warranty is given for the completeness, accuracy,reliability or fitness for particular purpose of its content and the products andservices presented therein. Specifications are subject to change withoutprior notice. Daikin Europe N.V. explicitly rejects any liability for any direct orindirect damage, in the broadest sense, arising from or related to the useand/or interpretation of this publication. All content is copyrighted by DaikinEurope N.V..
Daikin’s unique position as a manufacturer of airconditioning equipment, compressors andrefrigerants has led to its close involvement inenvironmental issues. For several years Daikin hashad the intension to become a leader in the provisionof products that have limited impact on theenvironment. This challenge demands the eco designand development of a wide range of products and anenergy management system, resulting in energyconservation and a reduction of waste.
VRV products are not within the scope of the Euroventcertification programme.
Naamloze VennootschapZandvoordestraat 300B-8400 Oostende - Belgiumwww.daikin.euBE 0412 120 336RPR Oostende