Service Manuals, User Guides, Schematic Diagrams or docs for : LG Air Conditioner lwb762cl AR3757~4
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4. TROUBLESHOOTING GUIDE
4.1 OUTSIDE DIMENSIONS
487mm(19 3/16 ")
140.5mm(5 1/2 ") 510mm(20 1/16 ")
1
28.5mm(1 /8")
353mm(13 7/8 ")
MODE
REGULAR ECONOMY
OFF CO O
9 1 F AN L
HIGH HIGH
8 2
LOW LOW
7 3
LER
6 4
OO
C
5
BEFORE RESTARTING
THERMOSTAT WAIT THREE MINUTES OPERATION
218mm(8 15/26")
487mm(19 3/16 ") 510mm(20 1/16 ")
353mm(13 7/8 ")
F AN
0 CO O
L
9 1
HIGH HIGH
8 2
LOW LOW
7 3
LER
6 4
OO
C
5
BEFORE RESTARTING
THERMOSTAT WAIT THREE MINUTES OPERATION
218mm(8 15/26")
487mm(19 3/16 ") 510mm(20 1/16 ")
353mm(13 7/8 ")
MODE SLEEP
AUTO RESTART
FAN COOL ON ON OFF
FAN SPEED TEMP POWER
218mm(8 15/26")
--20--
4.2 PIPING SYSTEM
CONDENSER COIL
FAN
CAPILLARY TUBE
MOTOR
COMPRESSOR
BLOWER
EVAPORATOR COIL
Discharge the refrigerant system using a Freon TM Recovery
System. If there is no valve to attach the recovery system, : REFRIGERANT FLOW
install one (such as a WATCO A-1) before venting the FreonTM.
Leave the valve in place after servicing the system. Do not
vent FreonTM into the atmosphere.
The following is a brief description of the important components and their function in what is called the refrigeration
system. Reference should made to figure 31 to follow the refrigerating cycle and the flow of the refrigerant in the
cooling cycle.
ROOM AIR CONITIONER
CYCLE OF REFRIGERATION
EVAPORATOR COILS CONDENSER COILS
VAPOR INLET
SUCTION LINE
COMPLETE LIQUID HOT
COOL LOW PRESSURE VAPOR
BOIL OFF POINT DISCHARGED
COOLED AIR
AIR
ROOM AIR HEAT LOAD
OUTSIDE COOLING
AIR FOR REFRIGERANT
PASS THROUGH
MOTOR
COMPRESSOR
OIL
LIQUID
PRESSURE LIQUID OUTLET
DROP
(LIQUID REFRIGERANT)
HIGH PRESSURE VAPOR
CAPILLARY TUBE LIQUID REFRIGERANT
LOW PRESSURE VAPOR
Figure 31
--21--
4.3 TROUBLESHOOTING GUIDE
In general, possible trouble is classified in two kinds.
The one is called Starting Failure which is caused from an electrical defect. The other is Ineffective Air
Conditioning caused by a defect in the refrigeration circuit and improper application.
Unit runs but poor cooling is ineffective.
Ineffective Cooling
Check of cold air circulation Check of outdoor coil Check heat load
for smooth flow. (heat exchanger) & fan increase.
operation.
Clean condenser.
Dirty indoor coil Check gas leakage.
(Heat exchanger)
Not on separate circuit
Repair gas leak.
Malfunction of fan
Check inside gas
Clogged of air filter Replacement of unit if the pressure.
unit is beyond repair.
Obstruction at air outlet
Adjusting of refrigerant
charge
Remove obstruction.
Malfunction of compressor
Check clogging in Replacement of
refrigeration circuit. compressor
Satisfactory operation with
Repair clogging in temperature difference of
refrigeration circuit. inlet & outlet air ;
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