SERVICE MANUAL CONTENTS 1. TECHNICAL CHANGES ····································2 2. PART NAMES AND FUNCTIONS······················3 3. SPECIFICATION·················································4 4. OUTLINES AND DIMENSIONS ·························5 5. WIRING DIAGRAM ············································8 6. REFRIGERANT SYSTEM DIAGRAM ················9 7. PERFORMANCE CURVES ······························12 8. TROUBLESHOOTING······································15 9. DISASSEMBLY INSTRUCTIONS ····················17 10. PARTS LIST······················································25 11. RoHS PARTS LIST···········································29 12. OPTIONAL PARTS···········································33 Wireless type Models SPLIT-TYPE, AIR CONDITIONERS MU-A08ND- MU-A08ND- MU-A10ND- MU-A10ND- MU-A12ND- MU-A15ND- MU-A15ND- C2 C1 C1 C2 C1 C2 C1 MU-A10ND MU-A12ND TM Revision:B • MU-A10ND - has been added. • RoHS PARTS LIST has been added. C2 Please void OB403 REVISED EDITION-A. NOTE: This service manual describes technical data of outdoor units. RoHS compliant products have <G> mark on the spec name plate. For servicing of RoHS compliant products, refer to the RoHS Parts List. OUTDOOR UNIT Indoor unit service manual MS-A•ND Series (OB402) No. OB403 REVISED EDITION-B
36
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No. OB403 SERVICE MANUAL MU-A08ND- MU-A10ND- …15ND_Service_Manual_(OB... · cc MU-A15ND 4.0 1.8 2280 35 5.62 0.5 2.97 RH207NRAT 1000 C-R 1.50 ... MU-A12ND Unit: mm MU-A10ND Refrigerant
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SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································22. PART NAMES AND FUNCTIONS······················33. SPECIFICATION·················································44. OUTLINES AND DIMENSIONS ·························55. WIRING DIAGRAM ············································86. REFRIGERANT SYSTEM DIAGRAM················97. PERFORMANCE CURVES······························128. TROUBLESHOOTING······································159. DISASSEMBLY INSTRUCTIONS ····················17
10. PARTS LIST······················································2511. RoHS PARTS LIST···········································2912. OPTIONAL PARTS···········································33
Revision:B• MU-A10ND - has been added.• RoHS PARTS LIST has been added.
C2
Please void OB403 REVISED EDITION-A.
NOTE:This service manual describes technical data of outdoor units.RoHS compliant products have <G> mark on the spec name plate.For servicing of RoHS compliant products, refer to the RoHS Parts List.
OUTDOOR UNIT
Indoor unit service manualMS-A•ND Series (OB402)
No. OB403REVISED EDITION-B
OB403B--1.qxp 07.6.26 10:28 AM Page 1
2
TECHNICAL CHANGES1
MU-09SN - ➔ MU-A08ND -1. Compressor has been changed. (RH-130NGDT ➔ 2R10S3R236A-6B)2. Outdoor fan motor has been changed. (RA6N23-AA ➔ RA6N33-AA)3. Compressor capacitor has been changed.4. Outdoor fan motor capacitor has been changed.
MU-10SN - ➔ MU-A10ND -1. Outdoor unit model has been changed.
•Valve cover has been added.•Dimension has been changed. (780Wo540Ho255D ➔ 800Wo550Ho285D)
2. Compressor has been changed. (RH145NGCT ➔ RH145NHNT)3. Outdoor fan motor has been changed. (RA6N33-AA ➔ RA6N21-AB)4. Compressor capacitor has been changed.5. Outdoor fan motor capacitor has been changed.6. Outdoor heat exchanger has been changed. ([9.52 L-Bend ➔ [7 Flat)
MU-12SN - ➔ MU-A12ND -1. Outdoor unit model has been changed.
•Valve cover has been added.•Dimension has been changed. (780Wo540Ho255D ➔ 800Wo550Ho285D)
2. Compressor has been changed. (RH167NHDT ➔ RH174NHNT)3. Outdoor fan motor has been changed. (RA6N33-AA ➔ RA6N30-BA)4. Compressor capacitor has been changed.5. Outdoor fan motor capacitor has been changed.6. Outdoor heat exchanger has been changed. ([9.52 L-Bend ➔ [7 Flat)
MU-15SN - ➔ MU-A15ND -1. Compressor has been changed. (RH-207NHDT ➔ RH207NRAT)2. Outdoor fan motor has been changed. (RN6N50-BA ➔ RA6V60-MA)3. Compressor capacitor has been changed.4. Outdoor fan motor capacitor has been changed.
MU-A08ND - ➔ MU-A08ND -MU-A15ND - ➔ MU-A15ND -1. Valve cover has been added.
MU-A10ND - ➔ MU-A10ND -1. Outdoor heat exchanger has been changed.2. Capillary tube has been changed.
C2C1
C2C1
C2C1
C1C2
C1C2
C1C2
C1C2
Revision A:• MU-A08ND - and MU-A15ND - have been added.C2C2
Revision B:• MU-A10ND - has been added. • RoHS PARTS LIST has been added.
C2
OB403B--1.qxp 07.6.26 10:28 AM Page 2
3
PART NAMES AND FUNCTIONS2
OUTDOOR UNIT
MU-A08ND
MU-A15ND
Air inlet
Piping
Drain hose
Air outlet
Drain outlet
(back and side)
MU-A10NDMU-A12ND
Air inlet
Piping
Drain hose
Air outlet
Drain outlet
back and side : MU-A10ND back : MU-A12ND( )
Air inlet
Piping
Drain hose
Air outlet
Drain outlet
(back and side)
OB403B--1.qxp 07.6.26 10:28 AM Page 3
SPECIFICATION
4
3
Outdoor model
Function
Power supply
Coefficient of performance (C.O.P)
CapacityDehumidificationAir flowStarting currentCompressor motor currentFan motor current
NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.2.Use copper conductors only. (For field wiring)3. Symbols below indicate./: Terminal block
TB1
TB2
GRN/YLW
N
L
2
N
L
MF
C2
C1
SRED MC
R
C
BLK
PO
WE
R S
UP
PLY
220-
230V
~/N
60H
z
CO
NN
EC
TIN
GT
O IN
DO
OR
UN
IT
BR
N
BLU
BLU
BLU
14 51CWHT WHT
BLKWHTREDWHT
F1
F2
220-230V~
220-230V~
MU-A10NDMU-A12ND
SYMBOL
C1
C2
SYMBOL
F
MC
SYMBOL
MF
TB1,TB2
NAME NAME NAME
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR
FUSE (3.15A)
COMPRESSOR (INNER PROTECTOR)
OUTDOOR FAN MOTOR (INNER FUSE)
TERMINAL BLOCK
NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.2.Use copper conductors only. (For field wiring)3. Symbols below indicate./: Terminal block :Connector
Refrigerant pipe(Option) [6.35(with heat insulator) Refrigerant flow in cooling
Unit: mm
Stop valve(with service port)
Compressor
Flared connection
Flared connection
Stop valve
MU-A15ND
SYMBOL
C1
C2
SYMBOL
F
MC
SYMBOL
MF
TB1,TB2
NAME NAME NAME
COMPRESSOR CAPACITOR
OUTDOOR FAN CAPACITOR
FUSE (3.15A)
COMPRESSOR (INNER PROTECTOR)
OUTDOOR FAN MOTOR (INNER PROTECTOR)
TERMINAL BLOCK
NOTE:1. About the indoor side electric wiring refer to the indoor unit electric wiring diagram for servicing.2.Use copper conductors only. (For field wiring)3. Symbols below indicate./: Terminal block :Connector
Model Outdoor unit precharged Refrigerant piping length (one way)
15m 20m
195
7m 10m
1200 45
MU-A08ND
MU-A10ND -
MU-A10ND -
MU-A12ND
MU-A15ND
800
600
1100
1200
1600
C1
C2
PERFORMANCE CURVES7
The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions.Since operating conditions vary according to the areas where these units are installed. The following information has beenprovided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
(1) GUARANTEED VOLTAGE198 ~ 253V, 60Hz
(2) AIR FLOWAir flow should be set at MAX.
(3) MAIN READINGS(1) Indoor intake air wet-bulb temperature : °CWB(2) Indoor outlet air wet-bulb temperature : °CWB(3) Outdoor intake air dry-bulb temperature : °CDB(4) Total input: WIndoor air wet/dry-bulb temperature difference on the left side of the chart on next page shows the difference between theindoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your reference at service.
MU-A08ND MU-A10ND MU-A12ND MU-A15ND
OB403B--1.qxp 07.6.26 10:28 AM Page 12
13
1 Both indoor and outdoor units are under the same temperature/humidity condition.
OUTDOOR LOW PRESSURE AND OUTDOOR UNIT CURRENTCOOL operation
2 Air flow should be set at MAX.
Dry-bulb temperature (:) Relative humidity (%)
20 50
25 60
30 70
3 The unit of pressure has been changed to MPa on the international system of units(SI unit system).The conversion factor is : 1(MPa [Gauge]) =10.2(kgf/ff [Gauge])
Indoor intake air WB temperature (:)
Outdoor intake air DB temperature (:)
Indoor intake air WB temperature (:)
Outdoor intake air DB temperature (:)
MU
-A10
ND
MS
-A10
ND
MU
-A12
ND
MS
-A12
ND
MS
-A15
ND
MU
-A15
ND
4.8
4.3
5.4
7.0
6.5
5.9
MU
-A08
ND
5.4
4.8
6.0
7.9
7.3
6.6
7.5
6.7
8.4
11.2
10.2
9.3
8.5
7.5
9.5
12.8
11.6
10.5
MS
-A08
ND
Wet-and dry-bulbthermometers
Wet and dry-bulbthermometers
How to measure the indoor air wet/dry-bulb temperature difference1. Attach at least 2 sets of wet and-dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets
of wet and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where airspeed is high.
2. Attach at least 2 sets of wet and dry-bulb thermometers to the outdoor air intake.Cover the thermometers to prevent direct rays of the sun.
3. Check that the air filter is cleaned.4. Open windows and doors of the room.5. Press the EMERGENCY OPERATION switch once to start the EMERGENCY COOL MODE.6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.7. 10 minutes later, measure temperature again and check that the temperature does not change.
8-1. Cautions on troubleshooting1. Before troubleshooting, check the following:
1) Check the power supply voltage.2) Check the indoor/outdoor connecting wire for mis-wiring.
2. Take care the following during servicing.1).Before servicing the air conditioner, be sure to turn off the main unit first with the remote controller, and then after con-
firming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel and the electronic
control P.C. board.3) When removing the electronic control P.C. board, hold the edge of the
board with care NOT to apply stress on the components.4) When connecting or disconnecting the connectors, hold the housing of the
connector. DO NOT pull the lead wires.
Lead wiring Housing point
Start
Indoor unit operates.Outdoor unit doesn't operate.
Indoor unit doesn't receive the signal from remote controller.
OPERATION INDICATORlamp on the indoor unit is flashing on and off.
Outdoor unit operates in only Test run operation.
Outdoor unit doesn't operate even in Test run operation.
Indoor unit operates, when the EMERGENCY OPERATION switch is pressed.
Indoor unit doesn't operate, when the EMERGENCY OPERATION switch is pressed.
Check room temperature thermistor.Refer to "Test point diagram and voltage".
Check of wiring diagramof outdoor unit.
Refer to "Check of remote controller and receiver P.C. board".
Left lamp2-time flash Cause:Indoor unit• Trouble of room temperature/ indoor coil thermistor
Left lamp3-time flash Cause:Indoor unit• Trouble of indoor fan motor
Check room temperature thermistor and indoor coil thermistor.Refer to "Test point diagram and voltage".
Refer to "Check of indoor fan motor".
1. Check indoor / outdoor connecting wire.2. Refer to "Check of indoor electronic control P.C. board".
Left lamp4-time flash Cause:Indoor unit• Trouble of indoor control system
Replace the indoor electronic control P.C. board.
As for indoor unit, refer to service manual OB402.
Both lamps(Left and right)Flash on and off at 0.5-second intervalsCause:Indoor unit• The horizontal vanes are not installed correctly.
Refer to "Check of installation of the horizontal vane".
8-2. Instruction of troubleshooting
MU-A08ND MU-A10ND MU-A12ND MU-A15ND
OB403B--1.qxp 07.6.26 10:28 AM Page 15
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Outdoor fanmotor (MF)
INNER PROTECTORMU-A08ND135i 5: OPEN95i 15: CLOSEMU-A15ND130i 5: OPEN83i 15: CLOSE
INNER FUSEMU-A10/12ND149i 3: OPEN
WHTREDBLK
MAINAUX.
WHTREDBLK
MAIN
AUX.
MU-A15ND
MU-A08ND
FUSE
WHTREDBLK
MAINAUX.
MU-A10/12ND
ORN
Compressor(MC)OVERCURRENTRELAYMU-A08ND150i 5: OPEN
78i 9: CLOSEINNER PROTECTORMU-A10ND150i 5: OPEN90i10: CLOSE
MU-A12ND155i 5: OPEN90i10: CLOSE
MU-A15ND155i 5: OPEN90i10: CLOSE
8-3. Trouble criterion of main parts
Part name Check method and criterion Figure
R
C
S
REDBLK
WHT
MAINAUX.
R
C
S
REDBLK
WHT
MAINAUX.
P
MU-A10/12/15ND
MU-A08ND
PP:INNER PROTECTOR
Measure the resistance between the terminals with a tester.(Coil wiring temperature -10°C ~ 40°C)
Color oflead wire
Normal
WHT-BLK
BLK-RED
102 ~ 126 "
97 ~ 120 "
MU-A15ND
132 ~ 162 "
233 ~ 286 "
MU-A08ND
338 ~ 414 "
228 ~ 280 "
MU-A10ND
275 ~ 337 "
224 ~ 276 "
MU-A12ND
Measure the resistance between the terminals with a tester.(Coil wiring temperature -10°C ~ 40°C)
Color oflead wire
Normal
MU-A12ND
1.0 ~ 2.37 "
2.0 ~ 3.56 "
MU-A15ND
1.32 ~ 1.61 "
2.06 ~ 2.51 "
C-R
C-S
MU-A08ND
3.61 ~ 4.41 "
4.93 ~ 6.01 "
MU-A10ND
2.0 ~ 2.96 "
3.0 ~ 4.25 "
MU-A08ND MU-A10ND MU-A12ND MU-A15ND
OB403B--1.qxp 07.6.26 10:28 AM Page 16
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DISASSEMBLY INSTRUCTIONS9
(1) Slide the sleeve and check if there is a locking lever or not. (2) The terminal with this connector has the locking mechanism.
1Slide the sleeve.2Pull the terminal while pushing the locking lever.
1Hold the sleeve, and pull out the terminal slowly.
The terminal which has the locking mechanism can be detached as shown below.There are two types ( Refer to (1) and (2)) of the terminal with locking mechanism.The terminal without locking mechanism can be detached by pulling it out.Check the shape of the terminal before detaching.
<"Terminal with locking mechanism" Detaching points>
Connector
Sleeve
Locking lever
9-1. MU-A08NDOUTDOOR UNIT
OPERATING PROCEDURE PHOTOS
1. Removing the cabinet(1) Remove the screws of the top panel.(2) Remove the screws of the service panel.(3) Remove the screw of the valve cover (MU-A08ND- ).(4) Remove the screws of the cabinet.(5) Remove the screws of the front panel and motor support.(6) Remove the service panel, and remove the screw from
the inside.(7) Remove the valve cover (MU-A08ND- ).(8) Remove the top panel.(9) Remove the cabinet.
C2
C2
Photo 1
Photo 3
Screws of thetop panel
Servicepanel
Screws of theservice panel
Screws ofthe top panel
Screws ofthe cabinet
Screws of the cabinet
Photo 2
Screws of the front panel and motor support
Screws of thecabinet
Photo : MU-A08ND - C2
Photo : MU-A08ND - C2
Screwof thevalvecover
OB403B--1.qxp 07.6.26 10:28 AM Page 17
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Compressorcapacitor (C1)
OPERATING PROCEDURE PHOTOS
2. Removing the electrical parts(1) Remove the service panel and the cabinet.(Refer to 1.)(2) Remove the following parts.
•Compressor capacitor (C1)•Outdoor fan capacitor (C2)•Terminal block (TB)
Photo 6
Compressor
Terminal cover
3. Removing the propeller and the outdoor fan motor(1) Remove the cabinet. (Refer to 1.)(2) Remove the propeller nut.(3) Remove the propeller .NOTE : Loose the propeller in the rotating direction for
removal.When attaching the propeller, align the mark on thepropeller and the motor shaft cut section.Set the propeller in position by using the cut on theshaft and the mark on the propeller.
(4) Remove the lead clamps and the outdoor fan motor lead wires.
(5) Remove the screws fixing the outdoor fan motor.(6) Remove the outdoor fan motor.
Photo 5
Suction pipeDischarge pipe
Compressor nuts
4. Removing the compressor(1) Remove the cabinet. (Refer to 1.)(2) Remove the relay panel.(3) Remove the soundproof felt.(4) Remove the terminal cover on the compressor.(5) Disconnect lead wires from the glass terminal of the com-
pressor.(6) Recover gas from the refrigerant circuit.NOTE : Recover gas from the pipes until the pressure gauge
shows 0 kg/cm2 (0MPa).(7) Disconnect the welded part of the discharge pipe(8) Disconnect the welded part of the suction pipe.(9) Remove the nuts fixing the compressor.(10) Remove the compressor.
Glass terminal
Photo 4 Outdoor fancapacitor (C2)
Terminal block
Lead clamp
Propeller Propeller nut
Outdoorfan motor
Set screws ofoutdoor fan motor
OB403B--1.qxp 07.6.26 10:28 AM Page 18
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9-2. MU-A10NDOUTDOOR UNIT
OPERATING PROCEDURE PHOTOS
1. Removing the cabinet(1) Remove the screws fixing the top panel.(2) Remove the top panel.(3) Remove the screw fixing the service panel.(4) Pull down the service panel and remove it.(5) Remove the screws fixing the cabinet.(6) Remove the cabinet.(7) Disconnect the indoor/ outdoor connecting wire.(8) Remove the screws fixing the back panel.(9) Remove the back panel.
Photo 1
Photo 3
Screws ofthe top panel
Screws ofthe cabinet
Screws of the cabinet
Photo 2
Screws of the front panel and motor support
Screws of thetop panel
Servicepanel
Screw of thecabinet
Direction to remove
Hooks
Screw of theservice panel
2. Removing the electrical parts(1) Remove the service panel and the cabinet. (Refer to 1.)(2) Remove the following parts.
•Compressor capacitor (C1)•Outdoor fan capacitor (C2)•Terminal block (TB)
Photo 4
Outdoor fan capacitor (C2)
Compressor capacitor (C1)
Terminal block (TB)Photo : MU-A10ND - C1
OB403B--1.qxp 07.6.26 11:30 AM Page 19
20
Glass terminal
OPERATING PROCEDURE PHOTOS
3. Removing the propeller and the outdoor fan motor(1) Remove the cabinet. (Refer to 1.)(2) Remove the propeller nut and the propeller.NOTE : Loose the propeller in the rotating direction for
removal.When attaching the propeller, align the mark on the propeller and the motor shaft cut section.Set the propeller in position by using the cut on the shaftand the mark on the propeller.
(3) Remove the lead clamps and outdoor fan motor lead wires.(4) Remove the screws fixing the outdoor fan motor.(5) Remove the outdoor fan motor.
Photo 5
Propeller
Propeller nut Outdoor
fan motor
Set screws of theoutdoor fan motor Hook
Relay panel
Outdoor fan motor lead wires
Set screws of theoutdoor fan motor
4. Removing the compressor(1) Remove the cabinet. (Refer to 1.)(2) Remove the screws fixing the relay panel.(3) Remove the soundproof felt.(4) Remove the terminal cover.(5) Pull out the lead wires from the glass terminal of the com-
pressor.(6) Recover gas from the refrigerant circuit.NOTE : Recover gas from the pipes until the pressure gauge
shows 0 kg/cm2 (0MPa).(7) Disconnect the welded part of the suction pipe and
discharge pipe.(8) Remove the nuts fixing the compressor.(9) Remove the compressor.
Photo 6
Compressor
Suction pipeDischarge pipe
Compressor nuts
Photo : MU-A10ND - C1
Photo : MU-A10ND - C1
OB403B--1.qxp 07.6.26 10:28 AM Page 20
21
OPERATING PROCEDURE PHOTOS
2. Removing the electrical parts(1) Remove the service panel and the cabinet. (Refer to 1.)(2) Remove the following parts.
•Compressor capacitor (C1)•Outdoor fan capacitor (C2)•Terminal block (TB)
9-3. MU-A12ND OUTDOOR UNIT
Photo 4
1. Removing the cabinet(1) Remove the screws fixing the top panel.(2) Remove the top panel.(3) Remove the screw fixing the service panel.(4) Pull down the service panel and remove it.(5) Remove the screws fixing the cabinet.(6) Remove the cabinet.(7) Disconnect the indoor/ outdoor connecting wire.(8) Remove the screws fixing the back panel.(9) Remove the back panel.
Photo 1
Screws of the cabinet
Screws of the front panel and motor support
Photo 3 Screws of thetop panel
Servicepanel
Screw of thecabinet
Direction to remove
Hooks
Screw of theservice panel
Screws ofthe top panel
Screws ofthe cabinet
Photo 2
Outdoorfan capacitor(C2)
Compressorcapacitor (C1)
Terminal block (TB)
OB403B--1.qxp 07.6.26 11:39 AM Page 21
22
PHOTOS
Photo 6
Photo 5
OPERATING PROCEDURE
3. Removing propeller and the outdoor fan motor(1) Remove the cabinet. (Refer to 1.)(2) Remove the propeller nut and remove the propeller.NOTE : Loose the propeller in the rotating direction for
removal.When attaching the propeller, align the mark on the propeller and the motor shaft cut section.Set the propeller in position by using the cut on theshaft and the mark on the propeller.
(3) Disconnect the connector and remove the lead clamps andoutdoor fan motor lead wires.
(4) Remove the screws fixing the outdoor fan motor.(5) Remove the outdoor fan motor.
4. Removing the compressor(1) Remove the cabinet. (Refer to 1.)(2) Remove the relay panel.(3) Remove the soundproof felt.(4) Remove the terminal cover.(5) Pull out the lead wires from the glass terminal of the com-
pressor.(6) Recover gas from the refrigerant circuit.NOTE : Recover gas from the pipes until the pressure gauge
shows 0 kg/cm2 (0MPa).(7) Disconnect the welded part of the suction pipe and dis-
charge pipe.(8) Remove the nuts fixing the compressor and the compres-
sor.
Glassterminal
Dischargepipe
Suctionpipe
Compressor nuts
Compressor
Propeller
Propeller nut
Outdoorfan motor
Set screws of theoutdoor fan motor
Hook Relay panel
Outdoor fan motor lead wires
Set screws of theoutdoor fan motor
OB403B--1.qxp 07.6.26 10:29 AM Page 22
23
OPERATING PROCEDURE PHOTOS
1. Removing the cabinet(1) Remove the screws of the cabinet.(2) Hold the bottom of the cabinet on both sides and remove
the cabinet.(3) Remove the screws of the service panel and remove the
service panel.(4) Remove the screw of the valve cover and remove the valve
cover. (MU-A15ND- ).C2
2. Removing the electrical parts(1) Remove the cabinet. (Refer to 1.)(2) Remove the following parts.
•Compressor capacitor (C1)•Outdoor fan capacitor (C2)•Terminal block (TB)
Photo 1
Photo 3
Photo 2
Screwsof thecabinet
Screwsof thecabinet
Screws of the servicepanel
Compressor capacitor (C1)
9-4. MU-A15NDOUTDOOR UNIT
Outdoor fan capacitor (C2) Terminal block (TB)
Connector
3. Removing the outdoor fan motor(1) Remove the cabinet. (Refer to 1.)(2) Disconnect the connector and remove the hooked lead
wire from the fan motor.(3) Remove the propeller nut and remove the propeller.(4) Remove the screws fixing the fan motor.
Photo 4
Hook
Propeller Propeller nut
Set screws ofoutdoor fan motor
Screw of thevalve cover
Photo : MU-A15ND - C2
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PHOTOS
4. Removing the compressor(1) Remove the cabinet. (Refer to 1.)(2) Remove the terminal cover on the compressor.(3) Remove the electrical assembly. (Refer to 2.)(4) Remove the soundproof felt.(5) Recover gas from the refrigerant circuit.NOTE : Recover gas from the pipes until the pressure gauge
shows 0 kg/cm2 (0MPa).(6) Disconnect the welded part of the discharge pipe(7) Disconnect the welded part of the suction pipe.(8) Remove nuts fixing the compressor.(9) Remove the compressor.
Photo 5
Compressor
Dischargepipe
Suctionpipe
Compressor nuts
OPERATING PROCEDURE
Terminalcover
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PARTS LIST (non-RoHS compliant)10
Part numbers that are circled are not shown in the illustration.
10-1. OUTDOOR UNIT STRUCTURAL PARTS,ELECTRICAL PARTS AND FUNCTIONAL PARTS
MU-A08ND
No. Part No. Part name RemarksSymbol
in WiringDiagram
Q'ty/unit
123456789
10
11121314
15
16171819202122232425
RA6N33-2R10S3R236A-6B3RUBBERS/SET
{9.52{6.35
3P4P15+ /440VAC1.5+ /440VAC{3.0x{1.4x800
3.15A20A
MFMC
TB2TB1C1C2
51C
F1F2
MU-A08ND- MU-A08ND-
1111111131
11
11
1111111111
111111113
11111
11111111111
TOP PANELMOTOR SUPPORTOUTDOOR HEAT EXCHANGERCABINETGRILLEPROPELLEROUTDOOR FAN MOTORCOMPRESSORCOMPRESSOR RUBBER SETBASEBASESTOP VALVE (GAS)STOP VALVE (LIQUID)VALVE COVERSERVICE PANELBACK PANELBACK PANEL TERMINAL BLOCKTERMINAL BLOCKCOMPRESSOR CAPACITOROUTDOOR FAN CAPACITORCAPILLARY TUBEOVERCURRENT RELAYFUSE HOLDER (F1)FUSE HOLDER (F2)FUSEFUSE
REFRIGERANT PIPESThe air conditioner has flared connections its indoor and outdoor sides.Please use the optional extension pipe as follows.
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HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
CC Copyright 2005 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD.Distributed in Jul. 2007. No.OB403 REVISED EDITION-B 7Distributed in Oct. 2005. No.OB403 REVISED EDITION-A 6Reprinted in Apr. 2005. No.OB403 100Distributed in Apr. 2005. No.OB403 6Made in Japan
New publication, effective Jul. 2007Specifications subject to change without notice.