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Following is a brief description of the important components and their function in what is called the refrigeration
system. Reference should made to Figure 29 to follow the refrigeration cycle and the flow of the refrigerant in the
cooling cycle.

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18

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MOTOR

COMPRESSOR

OIL

(LIQUID REFRIGERANT)

CAPILLARY TUBE 

OUTSIDE COOLING
AIR FOR REFRIGERANT
PASS THROUGH

SUCTION LINE
COOL LOW PRESSURE VAPOR

COOLED
AIR

COMPLETE LIQUID
BOIL OFF POINT

LIQUID
PRESSURE
DROP

ROOM AIR HEAT LOAD

VAPOR INLET

HOT
DISCHARGED
AIR

LIQUID OUTLET

HIGH PRESSURE VAPOR

LIQUID REFRIGERANT

LOW PRESSURE VAPOR

ROOM AIR CONDITIONER

EVAPORATOR COILS

CONDENSER COILS

CYCLE OF REFRIGERATION

CAPILLARY  TUBE

COMPRESSOR

BLOWER

EVAPORATOR  COIL

CONDENSER  COIL

FAN

MOTOR

:  COOLING CYCLE
:  HEATING CYCLE

In general, possible trouble is classified in two causes.
The one is called Starting Failure which is caused from an electrical defect, and the other is Ineffective Air
Conditioning caused by a defect in the refrigeration circuit and improper application.

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19

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Check of outdoor coil
(heat exchanger) & the fan
operation

Check gas leakage.

Repair gas leak.

Replacement of unit if the
unit is beyond repair.

Satisfactory operation with
temperature difference of
inlet & outlet air ;
COOLING :   7~10°C
HEATING  : 15~17°C

Check heat load increase in
cooling operation.

Unexpected residue

Added heat load

Check of inside gas
pressure

Adjusting of refrigerant
charge

Malfunction of compressor

Replacement of
compressor

Check of cold (warm) air cir-
culation for smooth flowing

Dirty indoor coil
(Heat exchanger)

Malfunction of fan

Clogged of air filter

Obstruction at air outlet

Countermeasure against
above trouble.

Check clogging in refrigera-
tion circuit.

Repair clogging in refrigera-
tion circuit.

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20

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Check of circuit breaker
and fuse

Gas leakage of feeler bulb
of thermostat

Check of control switch

Only fan fails to start.

Improper wiring

Defect of fan motor
capacitor

Irregular motor resistance
(      )
Irregular motor insulation
(      )

Replacement of fan motor

Regular but fails to start.

Replacement of compressor
(locking of rotor, metal)

Improper thermostat setting

Loose terminal connection.

Improper wiring

Irregular motor resistance (    )

Irregular motor insulation (    )

Replacement of compressor
(Motor damaged)

Drop of power voltage

Capacitor check

Replacement

Only compressor fails to
start.

Defect of compressor
capacitor

Check of power source

Check of control switch
setting

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21

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The unit does not operate.

Is the Trans output power

AC 220V?

Is the Trans output power

about AC 13V?

Is shorted the Trans. output?

Is output Voltage of IC2

DC 12V?

Is output Voltage of IC3

DC 5V?

Is the voltage No.20 of IC1

DC 5V?

Exchange Main PCB Ass'y.

Is the 

connection between

Main and Display 

all right?

Is the reset circuit all right?

(The No.16 of 

IC1 is 5V.)

• Check the Fuse.
• Check the wiring diagram.

• Check the Main 
  PCB pattern.

• Exchange the Trans.

• Exchange BD1.

• Exchange IC2.

• Exchange IC3.

• Exchange IC4, C07.

• Connect connector
  exactly.

• Check the PCB 
  pattern.

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

NO

YES