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—33—

Test capacitor.

Check the terminals. If loose, repair or replace.

Check the system for a restriction.

If restricted, clean of replace.

Close if open.

Determine if the unit is properly sized for the area to

be cooled.

Check the set screw or clamp. If loose or missing,

correct. If the blower or fan is hitting air guide,

rearrange the air handling parts.

Remove the cabinet and carefully rearrange tubing

not to contact cabinet, compressor, shroud, and

barrier.

Set the knob to HIGH COOL or LOW COOL while

rocker switch is ON.

Check terminals. If loose, repair or replace.

Check the synchronous motor for open circuit.

Capacitor

Wiring

Refrigerating system

Air filter

Exhaust damper door

Unit undersized

Blower or fan

Copper tubing

Rotary switch.

Wiring

Synchronous motor.

Insufficient cooling or

heating

Excessive noise.

Auto air-swing fails.

—23—

Following is a brief description of the important components and their function in what is called the refrigeration
system. Reference should made to figure 33 to follow the refrigeration cycle and the flow of the refrigerant in the
cooling cycle.

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 CONITIONER

EVAPORATOR COILS

CONDENSER COILS

CYCLE OF REFRIGERATION

CAPILLARY  TUBE

COMPRESSOR

BLOWER

EVAPORATOR  COIL

CONDENSER  COIL

FAN

MOTOR

—24—

In general, possible trouble is classified in two kinds.
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.

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 ; 
44~50

°

F(7~10

°

C) 

Check heat load 
increase.

Clean condenser.

Not on separate circuit.

Check inside gas
pressure.

Adjusting of refrigerant
charge.

Malfunction of compressor.

Replacement of
compressor.

Check of cold  air circulation
 for smooth flow.

Dirty indoor coil
(Heat exchanger)

Stop of auto air-swing

Correct above trouble

Check clogging in refrigera-
tion circuit.

Repair clogging in refrigera-
tion circuit.

Obstruction at air outlet

Clogged of air filter.

Malfunction of fan

—25—

Check of circuit breaker
and fuse.

Gas leakage of feeler bulb
of thermostat

Check of control switch.

Fan only 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

Compressor only fails to
start.

Defect of compressor
capacitor.

Check of power source.

Check of control switch
setting.