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— 14 —

CONDENSER COILS

FAN

MOTOR

BLOWER

EVAPORTOR
COILS

CAPILLARY
YUBE

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

MOTOR

COMPRESSOR

OIL

(LIQUID REFRIGERANT)

CAPILLARY TUBE 

SUCTION LIME
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 PEFRIGERANT

LOW PRESSURE VAPOR

ROOM AIR CONITIONER

EVAPORATOR COILS

CONDENSER COILS

CYCLE OF REFRIGERATION

OUTSIDE COOLING
AIR FOR REFRIGERANT
PASS THROUGH

DISCHARGE

LINE

NOT HIGH PRESSURE

VAPOR

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.

Ñ

15

Ñ

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.

Unexpected residue

Overloaded Circuit

Check of inside gas
pressure.

Adjusting of refrigerant
charge.

Malfunction of compressor.

Replacement of
compressor.

Check of cold  air     
dirculation for smooth
 flow.

Dirty indoor coil
(Heat exchanger.)

Malfunction of fan.

Clogged of air filter.

Obstruction at air outlet.

Correct above trouble

Stop of auto air-swing

Check clogging in 
refrigeration circuit.

Repair clogging in 
refrigeration circuit.

— 16 —

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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— 17 —

Check voltage at outlet. Correct if none.

Check voltage to retary switch. If none, check
power supply cord. Replace cord if circuit is open.

Check switch continuity. Refer to wiring diagram
for terminal identification. Replace switch if
defective.

Connect wire. Refer to wiring diagram for terminal
identification. Repair or replace loose terminal.

Test capacitor.
Replace if not within ±10% of manufacturer's
rating. Replace if shorted, open, or damaged.

Fan blade hitting shroud or blower wheel hitting
scroll. Realign assembly.

Units using slinger ring condenser fans must
have 

1

/

4

to 

5

/

6

inch clearance to the base. If it is

hitting the base, shim up the bottom of the fan
motor with mounting screw(s).

Check fan motor bearings; if motor shaft will not
rotate, replace the motor.

Check voltage. If not within limits, call an
electrician.

Test capacitor.
Check bearings. Does the fan blade rotate freely.
If not, replace fan motor.

Pay attention to any change from high speed to
low speed. If the speed does not change, replace
the motor.

No power

Power supply cord

Rotary switch

Wire disconnected or
connection loose

Capacitor. (Discharge
capacitor before testing.)

Will not rotate

Revolves on overload.

Fan motor will not run.

Fan motor runs.

NAME PLATE RATING 

MINIMUM

MAXIMUM

220V / 240V

198V

264V

220V

198V

242V