operation manual direct drive.pdf

Truck Engine Driven Refrigeration Units

Model HT-050 II series

HT-070 II series

HT-100 II series

HT-250 II series

HT-500 II series

Model HT-100MB series

HT-250MB series

HT-500MB series

Operation Manual

- 1 -

Introduction

It is recommend you study the information contained in this manual, as it contains important instructions

on the correct operation of the unit controls.

This operating manual is published for informational purpose only and the information being furnished

should not be considered as all inclusive or meant to cover all contingencies. Performing pre-trip checks

and enroute inspections on a regular basis will minimize on the road operating problems.

A closely followed maintenance program will also keep your refrigeration unit fully operational and safe

at all times.

Contents

Safety precaution 2

First aid 2

Location of safety decals 3

Unit description 4

Unit specification 5-9

Temperature control SH-710ES 10-14

Temperature control SH-900/900ES 15-18

Temperature control SH-900K 19-21

Temperature control SH-800H 22-24

Error code and Trouble shooting 25-26

Pre-trip inspection of refrigeration unit 27-28

Safety device 28

Adjust belt tension 29

Safety countermeasure 30

Handling refrigeration vehicle 30

Maintenance inspection schedule 31

* All specification in this manual can be changed without prior notice.

- 2 -

SAFETY PRECAUTION Always wear safety glasses when working around or using battery acid or refrigerant.

Never operate the unit with the compressor discharge valve closed.

Avoid wearing loose clothing and touching parts when the unit is operating.

Drilling holes in the unit could weaken the structure or cause electrical fires.

Any work carried out on the unit must be done by a qualified technician.

Electric Standby

The unit may start automatically at any time when connected to power, and the on/off switch is in the

On position.

Electrical Hazard

Disconnect the electrical power cable from the all before commencing work on the unit.

Refrigerant Gas

Although fluorocarbon refrigerants are classified as safe, observe caution when working with

refrigerants.

When released into the atmosphere in the liquid state, fluorocarbons evaporate rapidly freezing

anything they contact.

Fluorocarbons tend to displace air and can cause oxygen depletion which in turn could cause

unconsciousness if released in a confined space.

Refrigerant Oil

Do not allow refrigerant oil to contact your eyes.

Do not allow prolonged contact with skin or clothing.

Wash thoroughly after use to avoid irritation.

FIRST AID Refrigerant Gas

Eyes : Flush immediately with water and seek medial assistance.

Skin : Flush area with warm water and do not apply heat. Wrap burns with dry, sterile dressing

and seek medical assistance.

Inhalation : Move victim to fresh air and if necessary restore breathing. Stay with victim until medical

assistance arrives.

Refrigerant Oil

Eyes : Flush immediately with water at least 25minutes while holding the eyelids open. Seek

medical assistance.

Skin : Remove contaminated clothing. Seek medical assistance if irritation is experienced.

Inhalation : Move victim to fresh air and if necessary restore breathing. Stay with victim until medical

assistance arrives.

Ingestion : Do not induce vomiting. Seek medical assistance.

- 3 -

LOCATION OF SAFETY DECALS

1. Fan Caution

Located top of the condenser

2. Power supply(option feature)

Located on the power receptacle box

FAN CAUTION

AC 220/380/415 VOLTS

- 4 -

Condenser Evaporator

Cab control box

CompressorUnder-mounted Electric

standby unit

LP/HP hoses

and tubes

UNIT DESCRIPTION The HwaSung Thermo units HT-050 II, HT-100 II, HT-250 II and HT-500 II are two split units designed

for fresh and frozen on vans and small to medium trucks. On compressor is powered by the vehicles engine while another one is powered by an electric motor. Models with heating system are also

available.

- 5 -

SPECIFICATION MODEL HT-050 HT-070 HT-100 HT-250 HT-500

Cargo Size 3.5~4.5 3.5~5 5~12 8~16 12~20 Operation Compressor is powered by truck engine

Thermo controller In-cab controls by digital Thermometer

Refriger-

ant

Type R-404A

Amount(Kg) 1.2Kg 1.5Kg 1.6~2.0Kg 1.8~2.0Kg 2.2Kg

Comp.

Model TM-13HD SELTEC TM-15HD TM-16HD

Origin Japan

Type Swash plate type

No. Cylinder 6cylinders

Displacement 131cc 147cc 163cc

RPM 700~6000

Weight(approx.) 4.4kg 4.6kg 4.9kg

Comp. Oil Jomo Freol Alpha 32TF

Amount(cc) 180cc 200cc 210cc

EVA.

Coil Aluminum. FIN & Copper Tube

Size(mm) 840*629*1630 840*629*163 1040*669*168 1200*689*170 1300*682*152

Fan motor DC 12V*6Amp

2700rpm*2EA

DC 12V*6Amp

2700rpm*2EA

DC 12V*6Amp

2350rpm*2EA

DC 12V*6Amp

*2350rpm*2EA

DC 12V*6Amp

*2350rpm*3EA

Fan AL 230

*4wings*2EA

AL 230

*4wings*2EA

AL 250

*5wings*2EA

PL 300

*4wings*2EA

AL 250

*5wings*3EA

Case ABS 3.0t ABS 3.0t ABS 3.0t ABS 3.0t Aluminum

Install Slim/Ceiling Slim/Ceiling Slim/Ceiling Slim/Ceiling Slim/Ceiling

Weight(approx.) 21kg 21kg 24kg 29kg 34kg

COND.

Coil Aluminum. FIN & Copper Tube

Size(mm) 960*431*220 1090*470*258 1090*470*258 1120*497*395 1120*497*395


*2350rpm*2EA

DC 12V*7Amp

*2350rpm*2EA

DC 12V*7Amp

*2350rpm*2EA

DC 12V*7Amp

*2350rpm*2EA

DC 12V*7Amp

*2350rpm*2EA

Fan AL 250

*5wings*2EA

AL 250

*5wings*2EA

AL 250

*5wings*2EA

AL 250

*5wings*2EA

AL 250

*5wings*2EA

Case ABS 3.0t ABS 3.0t ABS 3.0t ABS 3.0t ABS 3.0t

Install Nose(front) mount type

Weight(approx.) 22kg 25kg 25kg 32kg 34kg

Defrost Automatic hot gas defrost by microprocessor

- 6 -

MODEL HT-050RT HT-100RT HT-250RT

Operation Compressor is powered by truck engine or electric standby

motor


Refrigerant Type R-404A R-404A R-404A

Amount(Kg) 1.2kg 1.6~2.0kg 1.8~2.0kg

Compressor

Model TM-13HD TM-15HD TM-15HD

Origin Japan Japan Japan

Type Swash plate type Swash plate type Swash plate type

No. of Cylinder 6 cylinders 6 cylinders 6 cylinders

Displacement 131cc 147cc 147cc

RPM 700~6000rpm 700~6000rpm 700~6000rpm

Weight(approx. ) 4.4 Kg 4.6 Kg 4.6 Kg

Evaporator

Type Ceiling / Slim type

Coil Aluminum. FIN & Copper tube

Size(mm) 840*659*163 1040*669*168 1200*689*170


*2700rpm*2EA

DC12V*6Amp*

2350rpm*2EA

DC12V*6Amp*

2350rpm*2EA

Fan Aluminium230c*

4blades*2EA

Aluminium250*

5blades*2EA

Aluminium300*

4blades*2EA

Case ABS 3.0t ABS 3.0t ABS 3.0t

Weight(approx. ) 21Kg 24Kg 29Kg

Condenser

Coil Aluminum. FIN & Copper tube

Size(mm) 740*175*830 910*182*840 956*182*910

Fan motor DC 12V*7Amp*

2350rpm*2EA

DC 12V*7Amp*

2350rpm*2EA

DC 12V*7Amp*

2350rpm*2EA

Fan Plastic300*

5blades*1EA

Aluminium250*

5blades*2EA

Plastic300*

5blades*2EA

Install Roof Top mount type

Case Aluminum front top grill & side FRP covers

Weight(approx.) 16Kg 18Kg 18Kg


- 7 -

MODEL HT-100ESC HT-250ESC HT-500ESC Operation Compressor is powered by vehicle engine or electric motor


Refrigerant Type R-404A R-404A R-404A

Amount(Kg) 1.6kg 2.0kg 2.0kg

Compressor

Model TM-15HD

Origin Japan


No. of Cylinder 6 cylinders

Displacement 147cc

RPM 700~6000rpm

Weight(approx. ) 4.6 Kg

AC Motor

Origin Korea(HS Thermo)

AC Voltage 220/380/415Vac

Phase Three Phase

Hertz 50HZ/60HZ

HP 3HP

kW 2.2kw

Weight(approx.) 24kg

Evaporator

Type Ceiling/Slim Type

Coil Aluminum FIN & Copper Type

Size(mm) 1040*669*168 1200*689*170 1300*682*152


*2350rpm*2EA

DC 12V*6Amp

*2350rpm*2EA

DC 12V*6Amp

*2350rpm*3EA

Fan Aluminum 250

*5wings*2EA

Plastic 300

*4wings*2EA

Aluminum 250

*5wings*3EA

Case ABS 3.0t ABS 3.0t ABS 3.0t

Weight(approx.) 24kg 29kg 34kg

Condenser

Coil Aluminum FIN & Copper Tube

Size(mm) 1148*530*327 1200*540*430 1320*556*460


*2350rpm*2EA

DC 12V*7Amp

*2350rpm*2EA

DC 12V*7Amp

*2350rpm*2EA

Fan AL 250*

5wings*2EA

AL 250*

5wings*2EA

PL.300*

4wings*2EA


Case FRP case Steel front grill & side FRP doors

Weight(approx.) 86kg 124kg 133kg


- 8 -

MODEL HT-100MB HT-250MB HT-500MB

Operation Compressor is powered by truck engine

or electric standby motor


Ref.

Type R-404A

Amount(kg) 1.6kg 2.5kg 2.7kg

Compressor

Model TM-15HS TM-15HS/TM-16HS TM-16HS/TM-21HX

Origin Japan


Cylinder 6cylinders

cc 147cc 147cc/163cc 163cc/215cc

RPM 700~6000rpm

Evaporator

Coil Aluminium. FIN & Copper Tube

Fan motor DC 12V/24V, 2100rpm, 3EA

Fan PL.TURBO 240 FAN

Condenser


Size(mm) 1418*550*493 1733*565*620 1733*565*620


Fan AL.5B*250 PL.4B*300 PL.4B*300


Case FRP ABS ABS

Size(mm) 1418*550*493 1733*675*620 1733*675*620

Weight (approx. kg) 80kg 98kg 102kg

Defrost Automatic hot gas defrost initiated

& terminated by cab controller

- 9 -

MODEL HT-250MB ESC HT-500MB ESC

Operation Compressor is powered by truck engine or electric standby motor


Ref. Type R-404A R-404A

Amount(kg) 2.5kg 2.7kg

Compressor

Model TM-15HS/TM-16HS TM-16HS/TM-21HX

Origin Japan


Cylinder 6cylinders

cc 147cc/163cc 163cc/215cc

RPM 700~6000rpm

AC Motor

Origin Korea(HS Thermo)

AC Voltage 220V/380V/415V AC

Phase Single / Three Phase

Hertz 50HZ / 60HZ

HP 3HP

kW 2.2kw

Weight(approx. kg) 24kg

Evaporator



Fan PL.TURBO 240 FAN

Condenser


Size(mm) 1733*565*620


Fan PL.4B*300*45


Case ABS

Weight (approx. kg) 145kg Included A/C Motor 150kg Included A/C Motor

Defrost Automatic hot gas defrost initiated & terminated by cab controller

- 10 -

TEMERATURE CONTROLS

Cab control system Model HS710ES (standard export)

1. Front Panel commands

Power switch :Power on/off switch for refrigeration unit. Mode/Set :To display target set point, in programming mode it selects a parameter or confirm an operation.

Def :To start a manual defrost A/C:To start air conditioning(optional feature) Up :To see the max. stored temperature, in programming mode it browses the parameter code, or increase the displayed value.

Down :To see the min. stored temperature, in programming mode it browses the parameter code, or decrease the displayed value.

1-1. Description of indicators in the display

Indicators Mode Function

On Showing Temperature A(single compartment)

On Showing Temperature B for second compartment(option)

On Showing Temperature setting

On Cooling is started

On Defrost enabled

On Air conditioning mode(Option)

On Electric power engaged(Option)

On/Flash Trouble with compressor

- 11 -

1-2 Use of Leds

Led Mode Function

POWER On Showing power is On. Compressor enabled

A/C On Showing air conditioning mode(Option)

COOL On Showing cooling is started

DEF On Defrost enabled

SET On Showing temperature is setting with new value

HEAT On Heating system(option)

E.S On Electric power engaged

2. How to start and stop the cab controller

1> Start the vehicle engine

2> Press the POWER key to start the refrigeration

unit. Type of controller will be displayed shortly.

3> Power led will be on.

4> Current cargo temperature will be displayed.

5> If the cargo temperature is higher than set

temperature, refrigeration unit is running in Cooling

mode. Cooling indicator will be on.

6> To stop the controller, press the POWER key

again.

2-1 How to change the set point(new temperature)

1> Press the MODE/SET key once to change the set

point value.

2> The current value of the set point will be displayed.

3> To change the set value, push the UP or DOWN

key.

4>To memorize the new set temperature value, push

the MODE/SET key again.

5> Cooling led can be On before or after setting.

! Cooling indicators can be light on whenever

temperature is higher than set temperature and will

be off when it reaches at set point. Condenser and

evaporator fans will be stopped at the same time of

cooling off.

- 12 -

2-2 How to start a manual defrost

1> Press the DEF key and a manual defrost will start

2> Defrost indicator will be light and DEF led will be

lighted on.

3> Press DEF key again to stop the defrost. If not

pressed, defrost will be stopped depend on the set

value.

2-3 How to change the defrost time

Determines the defrost duration.

1> Press MODE/SET key more than 6seconds until

t10 is displayed.

2> To change the defrost time, push UP or DOWN

key.

3> To memorize the new defrost time, push the

MODE/SET key again.

4> Defrost time can be set from 00 to 30minutes

Eg)t05(5min.), t10(10min)

! Factory setting : t10(10min)

2.4 How to change the defrost period

Determines the time interval between the beginning

of two defrost cycles.

1> Press MODE/SET key more than 6seconds until

t10 is displayed.

2> Press one more time and d0.0 will be displayed

3> To change the defrost period, push UP or Down

key.

4> To memorize the new defrost period, push


5> Defrost period can be set from 0.0 to 3.0hours,

every 30mintues.

! Factory setting : d0.0 User has to enter the value.

Display 0.0 0.3 1.0 1.3 2.0 2.3 3.0

Value 0 30min. 1hour 1hr & 30min. 2hours 2hrs & 30min 3hours

- 13 -

2-5 How to change the temperature calibration

Allows to adjust possible offset of the thermostat probe.

1> Press the MODE/SET key more than 6seconds

until C0.0 is displayed.

2> To change the value, push UP or DOWN key.

3> Press MODE/SET key to memorize the new value.

4> Temperature calibration range : 9.9

2-6 How to change the differential

Intervention differential for set point. Compressor Cut

In is set point plus differential. Compressor Cut Out is

when the temperature reaches the set point.

1> Press the MODE/SET key more than 6seconds.

2> Press the MODE/SET key again until 02d is displayed.

3> To change the value, press the UP or DOWN key.

4> Press the MODE/SET key to memorize the new

value.

5> Differential range : 1~9 ! Factory setting : 2

- 14 -

3. How to start Air conditioning(optional feature)

1> Press the POWER key to start the controller for

refrigeration unit..

1> Press the A/C key to start air conditioning. A/C indicator

will be light on.

2> Press the A/C key again to stop air conditioning.

Although Air conditioning is off, refrigeration unit is still running.

! If Air conditioning is only necessary to operate, turn off the Power Switch. Then refrigeration unit will be

stopped and only the air conditioning will be operated.

4. Electric Standby power input(optional feature)

Allows the operation of the unit while the

vehicle engine is off, the refrigeration unit will

be operated by the standby motor.

1> Stop the vehicle engine.

Warning! Electric standby can be damaged if it

is connected while engine is running.

2> Connect the plug to the main electricity.

Warning! Check the AC voltage of refrigeration

unit and main power before connecting. Electric standby can be damaged if it in connected with

incorrect voltage.

3> Push the POWER SWITCH to start the electric standby. Plug indicator will be light on and E.S

leds also lighted on.

4> Cooling and Defrost indicators will be light on together for pressure equalization at the

beginning of start for about 8seconds.

5> After equalization, defrost indicator will be off and if cooling will be started.

6> To stop the electric standby, press the power switch off and disconnect the plug.

5. How to change the equalization time.

1> Push the UP key more than 6seconds.

2> F08 will be displayed.

3> Push UP or DOWN keys to change the value.

4> Press the MODE/SET key to memorize the new value.

! Factory setting : 8seconds

! Equalization range : 8~12seconds.

- 15 -

Cab control system Model HS900, 900ES (Hyundai Motor Mighty 2.5ton)


Power switch :Power on/off switch for refrigeration unit. Mode/Set :To display target set point, in programming mode it selects a parameter or

confirm an operation.

Def :To start a manual defrost A/C :To start air conditioning(optional feature) Up :To see the max. stored temperature, in programming mode it browses the

parameter code, or increase the displayed value.


1-1. Description of indicators in the displays


On Show ing Temperature A(single compartment)

On Show ing Temperature B for second compartment(option)

On Show ing Temperature setting


On Defrost enabled


On Electric pow er engaged(Option)

On/Flash Trouble w ith compressor

- 16 -


1> Start the vehicle engine.

2> Press the POWER key to start the refrigeration

unit. The type of controller will be displayed shortly.



temperature, refrigeration unit running in Cooling


5> To stop the controller, press POWER key again.

2-1 How to change the set point(temperature)

1> Press the MODE/SET key once to change the

set temperature value.

2> Current value of the set point will be displayed.

3> To change the set value, push the UP or

DOWN key

4> Push the MODE/SET key again to memorize

the new set temperature.


temperature is higher than set temperature and will be off when it reaches at set point. Condenser and

evaporator fans will be stopped at the same time of cooling off.


1> Push DEF key and a manual defrost will be

started.

2> Defrost indicator will be light on.

3> Push DEF key to stop the defrost.

4> Defrost will be automatically stopped if you DEF key is not pressed.

Caution If cargo temperature is over 15, defrost will be automatically stopped and DEF key will not be operated.

Defrost time(duration) can be set between 0~30minutes and only manual defrost is operated with 0 minute.


Determine the defrost duration.

1> Push MODE/SET key more than 3seconds until

t10 is displayed.


key.

3> To memorized the new Defrost time, push the

MODE/SET key again.

! Defrost time(duration) can be set between

0~30minutes. Eg) t05(4min.), t10(10min.)

! : Factory setting : t10(10minutes)

- 17 -

2-4 How to change the defrost period

Determine the time interval between the beginning


1> d00 will be displayed after new defrost time is

set Or Press the MODE/SET key more than

3seconds until t10is displayed.

2> Press once more and D0.0will be displayed.

3> To change the defrost value, push UP or

DOWN key.

4> Push the MODE/SET key again to memorize the new defrost period.

5> Defrost period can be set from 0.0 to 3.0hours,every 30mintues.

Display 0.0 0.3 1.0 1.3 2.0 2.3 3.0


! Factory setting : d0.0, User has to enter the value.


Allows to adjust possible offset of the thermostat

probe.




3> Press MODE/SET key to memorize the new

value.

4> Temperature calibration range : 9.9 ! Factory setting : 0.0

2-6 Differential

Interval differential for set point. Compressor Cut In is set point plus Differential and Compressor Cut

Out is when the temperature reaches at set point.

! Factory setting : 2 and impossible to change the value.

- 18 -



refrigeration unit..


will be light on.


Although Air conditioning is off, refrigeration unit is still

running.

! If Air conditioning is only necessary to operate, turn off the Power Switch. Then refrigeration unit will be

stopped and only the air conditioning will be operated.

4. Electric Standby power input.(900ES Only)

1> When you stop operating by vehicle engine, and wish to operate the unit by standby motor, connect

the plug to outside electricity .

2> Push the POWER Switch to start the electric standby. Plug indicator will be light on

3> Cooling and Defrost indicators will be light on together for pressure equalization at the beginning of

start for about 8seconds.

4> After equalization, defrost indicator will be off and if cooling will be started.

5> To stop the electric standby, press the power switch off and disconnect the plug.

- 19 -

Cab control system Model SH900, 900K (Kia Motor New Frontier 1ton)


Power switch :Power on/off switch for refrigeration unit. A/C :To start air conditioning(optional feature) Mode/Set :To display target set point, in programming mode it selects a parameter or


Def :To start a manual defrost Up :To see the max. stored temperature, in programming mode it browses the



1-2. Description of indicators in the displays


On Showing Temperature A(single compartment)

On Showing Temperature B for second compartment(option)



On Defrost enabled



- 20 -



2> Press the POWER key, then the type of

controller will be displayed in very short time.





5> To stop the controller, press POWER key again.


1> Press the MODE/SET key once to change the

set temperature value.

2> Current value of the set point will be displayed.


DOWN key

4> Push the MODE/SET key again to memorize

the new set temperature.






started.



4> Defrost will be automatically stopped if you DEF key is not pressed.





1> Push MODE/SET key more than 3seconds

until t10 is displayed.


key.3> To memorized the new Defrost time, push





- 21 -





set Or Press the MODE/SET key more than

3seconds until t10is displayed.



DOWN key.

4> Push the MODE/SET key again to memorize the new defrost period.


Display 0.0 0.3 1.0 1.3 2.0 2.3 3.0





probe.




3> Press MODE/SET key to memorize the new

value.


2-6 Differential






refrigeration unit.


will be light on.


Although Air conditioning is off, refrigeration unit is still running.

! If Air conditioning is only necessary to operate, turn off the Power Switch. Then refrigeration unit will be stopped and only the air conditioning will be operated.

- 22 -

Cab control system Model SH-800H (Hyundai Motor New Porter II 1ton)


Power S/W :Power on/off switch for refrigeration unit. A/C :To start air conditioning(optional feature) Set :To display target set point, in programming mode it selects a parameter or


Def :To start a manual defrost Up :To see the max. stored temperature, in programming mode it browses the



1.1 Description of indicators in the displays



On Defrost enabled






2> Press the POWER key, then the type of

controller will be displayed in very short time.





4> To stop the controller, press the POWER key

again.

- 23 -


1> Press the SET key once to change the set

temperature value.

2> Current value of the set point will be displayed

and SET indicator will be light on.


DOWN key

4> Push the SET key again to memorize the new

set temperature.






started.



4> Defrost will be automatically stopped if you

DEF key is not pressed.





1> Push SET key more than 3seconds until t10

is displayed.

2>To change the defrost time, push UP or DOWN

key.

3> To memorized the new Defrost time, push the

MODE/SET key again.




- 24 -





set Or Press the SET key more than 3seconds

until t10is displayed.



DOWN key.

4> Push the SET key again to memorize the new

defrost period.


Display 0.0 0.3 1.0 1.3 2.0 2.3 3.0





probe.

1> Press the SET key more than 6seconds until

C0.0 is displayed.


3> Press SET key to memorize the new value.


2-6 Differential






refrigeration unit.


will be light on.


Although Air conditioning is off, refrigeration unit is still

running.

! If Air conditioning is only necessary to operate, turn off the Power Switch. Then refrigeration unit will be stopped and only the air conditioning will be operated.

- 25 -

ERROR CODE AND TROUBLE SHOOTING

1. Error code

< Shortage >

SH-700ES SH-900/900ES SH-900K SH-800H

< Open >

SH-700ES SH-900/900ES SH-900K SH-800H

< Compressor problematic >

If compressor does not operated or has some problem, SH700ES and SH900/900ES models

showing SH-900K and SH-800H displayed CEr code.

SH-700ES SH-900/900ES SH-900K SH-800H

- 26 -

2. Trouble shooting

Symptoms Management Cause

-Display Sh.t

-Refrigerator can not be stopped.

-Check the sensor wire-short.

-Check the sensor and change it.

-wire injured and short

-Sensor defective

-Display Op.n

-Refrigerator can not be stopped.

-Check the sensor connection.

-Check the sensor wire cut.

-Check the sensor and change it.

-Sensor wire open

-Sensor defective

-Evaporator fan has trouble

-Temperature can not be down

-Check the fuse of a evaporator.

-Check the relay output of a

evaporator.

-Check wire open

-Check the motor of evaporator.

-Motor overload

-Wire injured or opened

-Display CE.r

-Compressor can not be

operated

-Check the fuse of compressor.

-Check the relay output of

compressor.

-Check wire open

-Check the condenser.

-Compressor pressure over

loaded

-Wire opened

-No display after power on -Check the connection. -Check the GND wire.

-Check the fuse of the battery.

-Wire opened

-Relay and main Line

disconnected.

-Main power is trouble

- 27 -

PRE-TRIP INSPECTION OF REFRIGERATION UNIT While pre-trip inspections are not intended to take the place of regular maintenance inspections, to

following suggested functions should be performed prior of every trip involving refrigerated good.

1. Battery

It is necessary to check the battery periodically. The checking method is

same as the car battery. Terminals must be clean, tight and free of

corrosion.

2.Temperature control system

Temperature indication should be set carefully and correctly. Control box

system is corresponded to all the electric system and it should be kept away

from heavy shock and free of corrosion, cracks and moisture.

3.Electrical

Ensure all the electrical connections are secure. Wires and terminals should be free of corrosion, cracks

or moisture

4.Belt

Belt must not be frayed or cracked and must be adjusted with correct tension.

5.Structural

Visually inspect the unit for leaks, loose or broken parts and any damages. Both condenser and

evaporator coil should be free from debris.

6.Compressor handling

Do not strike, drop or turn the compressor upside down. Refrigerating

compressor is connected with the car main engine pulley through v-belt, so

tension of the belt should be checked regularly whether it is suitable or not.

When the belt is loose, must be adjusted to the correct tension.

Damaged belt should be replaced by new one. Also the pulley rotation of

magnet clutch should by replaced if there is a friction because of melting the

clutch pulley.

7.Listening of unusual noise

When you hear an unusual noise during the operating the unit, all over the

refrigerating system should be checked. Listen to the sound of the

compressor and check. If the clutch has a noise, it should be repaired and

check the tension of the bolts that fixed to compressor on main engine and

other fan of the blower. All of the bolts should be tied up and prompt repair is

necessary.

- 28 -

8.Refrigerant

Refrigerant is charged normally when there is no vapor in the refrigerant flow in the sight glass and the

checking method is as below.

Quantity of Refrigerant Status of refrigerant flow Remarks

O

Refrigerant flow is laminar is a normal

operation. The quantity is proper.

X

The quantity of refrigerant is not enough

and the bubbles appear.

The operating state is unstable.

x

Small bubbles is too much and the

refrigerant is not laminar.

9.Checking the joining parts

When there is an oil in the pipe joint parts, check it with the soap water. If

the bubbles founded, this is indication of a refrigerant leakage. If leaks are

in flare fittings, tighten the firings and leaks are in the pipe, welding repair

should be done.

10. Pre-Cooling the system before loading

It is very important and necessary to be pre-cooling the refrigerated truck body before loading. Products

may get damaged without pre-cooling the unit. Please refer below table for the pre-cooling temperature.

Loading product Product required temperature Pre-Cooling temperature

Cooling products

Chilled products

Frozen products

Ice cream

+5 ~ +15 5 ~ +5 10 ~ 15

25

+10 0 7 20

SAFETY DEVICE 1.High pressure switch

It is located at the receiver tank in the condenser. If the pressure is higher than normal operating

pressure, the circuit will be shut and protect the system.

2.Low pressure switch

It is located in condenser or evaporator. If the pressure is lower than normal operating pressure, the

circuit will be shut down not to operate in a vacuum state and thus to protect the system.

3.Fuse

It is a15ampere fuse, located in the relay box and protects the unit from over ampere input.

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ADJUST BELT TENSION Adjusting method of tension the belt pulley will be followed as below two instruction. However the

method would be different depend on the type of vehicle and engines.

1.Method of adjusting by the compressor body for 0.5ton refrigerated vehicle

Available model : HT-050II

Release the tension adjust-bar fixing bolt by turning one or two rotations. Release the bracket fixing bolt by turning half rotation and strain the belt through pushing the compressor body outwards.

When the tension is suitable, fasten the adjust-bar fixing bolt and bracket fixing bolt. Check the deflection is about 6mm when you push the belt by hand.

2.Method of adjusting by idle pulley for the 1ton~5ton refrigerated vehicle

Available model : HT-070II, HT-100II, HT-250II, HT-500II

Release the nut of the idle pulley shaft by turning one or two rotations. Adjust the tension with idle adjustment bolt. (Fasten the bolt when the belt is loosened and release the bolt when belt is too much tightened)

Fix the nut of idle pulley shaft. Check the deflection is about 6mm when you push down the belt by hand.

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SAFETY COUNTERMEASURE 1.Do not operate the unit with the outlet valve of the compressor closed.

2.Do not touch the blower and the belt when under the units operating.(same as when open or close the service of the compressor)

3.Check if the hose is located in a suitable place and keep the hose off the belt of other parts.

4.Keep wear safety glasses for protection. Refrigeration liquid or the batterys acidity may be critically harmful to the eyes.

5.Check if all the joint bolts are tightly fastened and its size is suitable.

6.Be careful when charging the refrigerant of refrigerating system in a closed space where the air can

not be well circulated.

HANDLING REFRIGERATED VEHICLE 1. Checking the truck body

Inspect the outside of the truck for damage or loose or improperly

fitting doors or seals. Repair any damages to the walls or insulation.

It may affect the refrigeration units performance. Inspect the inside of the cargo area and check for blocked drain

hoses.

2. Loading procedure

Ensure sufficient spacing in front of the evaporator for air

circulation when loading the products.

Ensure goods are at the correct temperature before loading

Caution : Do not load anything if the refrigeration unit makes

unusual noise or doesnt operated well or temperature doesnt drops.

If the unit causes any problem, all the loaded products should be

removed to safety place as soon as possible and the refrigeration unit should be get serviced.

3. Cleaning the inside cargo area

The inside cargo area must be kept clean always for the sanitary of

goods. The remains may cause to generate the bacteria and gas

and that will adhere to the pin of evaporator plate by circulating air.

The capacity if the refrigeration unit can be decreased by such oily

components.

Water should be removed after cleaning the cargo.

4. Parking

Avoid direct sunlight and recommend to be parked the vehicle in the shady and windy area. The sunlight

will be increased the heat inside of the cargo and thus refrigeration capacity can be affected.

5. Cleaning the condenser coil

Keep the condenser coil clean from the dust. Refrigeration unit should be stopped when cleaning.

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MAINTENANCE INSPECTION SCHEDULE

Inspect/Service these items After

Installation

Every

month

Every

3 months

Check the engine condition Check the compressor oil Check the compressor clutch Check condition of pulleys bearing Check the joining parts of each components Check the tighten of bolts and nuts Inspect compressor belt condition and proper tension Check the pipe and pipe clamp Listen for unusual noises, vibrations, etc Check the gas leakage Inspect the refrigerant through sight glass Inspect wire harness for damage wires or connections Inspect terminal of the electric cable Inspect the digital thermometer Check defrost initiation and termination Inspect refrigerators components (Sightglass, expansion valve and solenoid valve etc.)

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577-7, Chilkwe-Dong, Pyongtaek-Si, Kyonggi-DO, Korea 459-050

Tel +82 31 665 7972

Fax +82 31 665 7976

www. Hwasungthermo.co.kr

[email protected]

Operation Manual

operation manual direct drive.pdf

Documents

unit specification

mb series ht

series model ht

unit description

unit controls

medical assistance

mb series operation

temperature control