LG LWC1260PHG Service Manual ▷ View online
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25
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COMPLAINT
CAUSE
REMEDY
Check the system for a restriction.
If restricted, clean or replace.
Close if open.
Determine if the unit is properly sized for the
area to be cooled.
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.
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.
tubing not to contact cabinet, compressor, shroud,
and barrier.
Check the voltage at outlet. If none, correct.
Check the teminals. If loose, repair or replace.
Check for continuity, refer to the wiring diagram for
teminal identification. Replace the switch if the
circuit is open.
teminal identification. Replace the switch if the
circuit is open.
Check setting. Turn to warmest position.
Check the position of knob. If not at the warmest
setting, advance knob to this setting. Check conti-
nuity of the thermostat. Check continuity of control
by removing lead from terminal, turn the
selector switch to heat, and check between com-
mon terminal and H terminal. (NOTE: Room tem-
perature should be 30°C(86°F) or lower when test-
ing the temperature control.) If no continuity
exists, replace thermostat.
setting, advance knob to this setting. Check conti-
nuity of the thermostat. Check continuity of control
by removing lead from terminal, turn the
selector switch to heat, and check between com-
mon terminal and H terminal. (NOTE: Room tem-
perature should be 30°C(86°F) or lower when test-
ing the temperature control.) If no continuity
exists, replace thermostat.
Selecter switch must be in the " " mode.
Check continuity of the switch. Continuity should
be between terminals identified on wiring diagram
when the switch is in heat mode.
be between terminals identified on wiring diagram
when the switch is in heat mode.
Check continuity of the reverse valve coil.
Continuity should be between two lead wires.
If none, check the reverse valve body.
Replace the part which is defective.
Continuity should be between two lead wires.
If none, check the reverse valve body.
Replace the part which is defective.
Refrigerating system
Air filter
Exhaust damper door
Unit undersized
Blower or fan
Copper tubing
No power
Wiring
Rotary switch
Temperature control position
Thermostat
(Temperature control)
(Temperature control)
Selector switch position
Selector switch
Reverse valve
Insufficient cooling or
heating.
heating.
Excessive noise.
No heat.
4.2 PIPING SYSTEM
Following is a brief description of the important components and their function in what is called the refrigeration
system. Reference should made to Figure 25 to follow the refrigeration cycle and the flow of the refrigerant in the
cooling cycle.
system. Reference should made to Figure 25 to follow the refrigeration cycle and the flow of the refrigerant in the
cooling cycle.
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MOTOR
COMPRESSOR
OIL
(LIQUID REFRIGERANT)
CAPILLARY TUBE
OUTSIDE COOLING
AIR FOR REFRIGERANT
PASS THROUGH
AIR FOR REFRIGERANT
PASS THROUGH
SUCTION LINE
COOL LOW PRESSURE VAPOR
COOL LOW PRESSURE VAPOR
COOLED
AIR
AIR
COMPLETE LIQUID
BOIL OFF POINT
BOIL OFF POINT
LIQUID
PRESSURE
DROP
PRESSURE
DROP
ROOM AIR HEAT LOAD
VAPOR INLET
HOT
DISCHARGED
AIR
DISCHARGED
AIR
LIQUID OUTLET
HIGH PRESSURE VAPOR
LIQUID REFRIGERANT
LOW PRESSURE VAPOR
ROOM AIR CONDITIONER
EVAPORATOR COILS
CONDENSER COILS
CYCLE OF REFRIGERATION
Figure 25
CAPILLARY TUBE
COMPRESSOR
BLOWER
EVAPORATOR COIL
CONDENSER COIL
FAN
MOTOR
: COOLING CYCLE
: HEATING CYCLE
: HEATING CYCLE
(COOLING)
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4.3 TROUBLESHOOTING GUIDE
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.
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.
Unit runs but poor cooling or heating.
Ineffective Cooling or Heating
Check of outdoor coil
(heat exchanger) & the fan
operation
(heat exchanger) & the fan
operation
Check gas leakage.
Repair gas leak.
Replacement of unit if the
unit is beyond repair.
unit is beyond repair.
Satisfactory operation with
temperature difference of
inlet & outlet air ;
COOLING : 7~10
temperature difference of
inlet & outlet air ;
COOLING : 7~10
°
C
HEATING : 15~17
°
C
Check heat load increase in
cooling operation.
cooling operation.
Unexpected residue
Added heat load
Check of inside gas
pressure
pressure
Adjusting of refrigerant
charge
charge
Malfunction of compressor
Replacement of
compressor
compressor
Check of cold (warm) air cir-
culation for smooth flowing
culation for smooth flowing
Dirty indoor coil
(Heat exchanger)
(Heat exchanger)
Malfunction of fan
Clogged of air filter
Obstruction at air outlet
Countermeasure against
above trouble.
above trouble.
Check clogging in refrigera-
tion circuit.
tion circuit.
Repair clogging in refrigera-
tion circuit.
tion circuit.
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Fails to start.
Check of circuit breaker
and fuse
and fuse
Gas leakage of feeler bulb
of thermostat
of thermostat
Check of control switch
Only fan fails to start.
Improper wiring
Defect of fan motor
capacitor
capacitor
Irregular motor resistance
( )
Irregular motor insulation
( )
( )
Irregular motor insulation
( )
Replacement of fan motor
Regular but fails to start.
Replacement of compressor
(locking of rotor, metal)
(locking of rotor, metal)
Improper thermostat setting
Loose terminal connection.
Improper wiring
Irregular motor resistance ( )
Irregular motor insulation ( )
Replacement of compressor
(Motor damaged)
(Motor damaged)
Drop of power voltage
Capacitor check
Replacement
Only compressor fails to
start.
start.
Defect of compressor
capacitor
capacitor
Check of power source
Check of control switch
setting
setting
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