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Service Manual - Page 1
http://biz.lgservice.com
Window Air Conditioner SVC MANUAL(General)
MODEL : Window
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel.
Service Manual - Page 2
Air Conditioner Service Manual
CONTENTS
Safety Precautions ...3 Operation ...6
Features ...6 Control Locations Function of Controls 6 Troubleshooting Guide...9 Piping System ...9 Troubleshooting Guide...10 Electrical Parts Troubleshooting Guide 12 Room Air Conditioner Voltage Limits 20
2 Window Air Conditioner
Service Manual - Page 3
...
1.1 Cautions in this manual are at main potential when the equipment is classified by the short circuit. 3. This voltage is found, replace all parts
which have been overheated or damaged by the following instructions must be over 1MΩ.
This symbol indicates the possibility of death or serious injury. After servicing the unit, make an...
Service Manual - Page 4
... is risk of control box securely. Do not turn the air-conditioner ON or OFF by plugging or unplugging the power plug. Otherwise, working on the breaker under condition that the refrigerating cycle section has cooled down sufficiently. When the refrigerant gas leaks during the repair work , execute ventilation. Be sure to a fire, poisonous gas...
Service Manual - Page 5
... the installation platform or frame has corroded.
After the work has finished, be occurred.
1.2 Inspections after the repair. If...appliances.
Service Manual 5
There are connected. Check the drainage of air flow. If the plug is faulty the water to see if the parts are mounted correctly and wires are sharp and moving parts that could cause personal injury. Improper installation...
Service Manual - Page 6
... Window Air Conditioner The ...air is a normal setting for a cooler tempera- ture in the room, set the ventilation lever OPEN position.
lation and service. • Side air-intake, side cooled-air discharge.
• Built-in order to the desired position. Cooling Only Model...; OPERATION
Off
( 0 ) : Turns the air conditioner off.
Operation
Operation
Features
• Designed for COOLING...
Service Manual - Page 7
... FAN (
LOW COOL ( HIGH COOL ( LOW HEAT ( HIGH HEAT (
) : Turns the air conditioner off. ) : Permits the low fan speed opera-
2. The until it may hiss and the fan motor will stop for average conditions.
This should not be regarded as trouble. After defrosting, the heating operation begins again.
• THERMOSTAT Turn the thermostat...
Service Manual - Page 8
Cooling and Heating Model with this button is set by the automatic system and stops when you...Model: 2 steps {High [F2] ➔ Low[F1] ➔ High[F2]... }
ROOM TEMPERATURE SETTING BUTTON Control the room temperature within a range of starting and stopping operation. The timer is pressed and stops when you press the button again.
8 Window Air Conditioner
ON/OFF TIMER BUTTON Set...
Service Manual - Page 9
... LOAD
CONDENSER COILS
VAPOR INLET HOT DISCHARGED AIR
LIQUID PRESSURE DROP
MOTOR
OUTSIDE COOLING AIR FOR REFRIGERANT PASS THROUGH
COMPRESSOR
OIL
(LIQUID REFRIGERANT) CAPILLARY TUBE
Figure 33
LIQUID OUTLET
HIGH PRESSURE VAPOR LIQUID REFRIGERANT LOW PRESSURE VAPOR
Service Manual 9 Troubleshooting Guide
Piping System
Troubleshooting Guide
CONDENSER COIL FAN
MOTOR
CONDENSER COIL
CAPILLARY...
Service Manual - Page 10
....
The one is called Starting Failure which is caused from an electrical defect, and the other is classified in two kinds. Check inside gas pressure. Repair clogging in refrigeration circuit. Troubleshooting Guide
Troubleshooting Guide
In general, possible trouble is ineffective Air Conditioning caused by a defect in the refrigeration circuit and improper application.
Service Manual - Page 11
... motor resistance ( )
Irregular motor insulation ( )
Replacement of fan motor capacitor. Capacitor check.
Replacement of compressor (locking of fan motor. Improper wiring.
Replacement of rotor, metal). Fails to Start
Troubleshooting Guide
Check of control switch setting.
Compressor only fails to start . Improper wiring.
Service Manual 11 Check of power source. Defect of...
Service Manual - Page 12
... voltage No.20 of IC02D
NO
DC 5V? Troubleshooting Guide
Electrical Parts Troubleshooting Guide
LWC1264PAG/PAN/PCG, LWC1264QAG/QAS, LWC126CBHK0, LWC126CGMM0/CBMM1/LWC096CBMK0
Possible Trouble 1
The unit does not operate.
YES
Is ... Ass'y.
• Check the PCB pattern.
12 Window Air Conditioner YES
NO • Check the Main
Is shorted the Trans.
YES
Is the reset circuit all right?...
Service Manual - Page 14
....
• Check the SW1. • Check the pattern of SW1 to OWNER'S MANUAL.
• Set the Knob of
Main & Display PCB.
14 Window Air Conditioner Troubleshooting Guide
Possible Trouble 4
FAN does not operate. YES
Is the voltage NO.13 or 14 or 15 ...Lo.
• Check the wiring diagram.
• Exchange IC01M. • Exchange IC01M.
Possible Trouble 5
The function of IC01M DC 5V?
Service Manual - Page 16
...PCB Ass'y.
• Exchange IC4, C07.
• Connect connector exactly.
• Check the PCB pattern.
16 Window Air Conditioner YES
• Check the Fuse. • Check the wiring diagram. Is output Voltage of IC2
NO
DC 12V? ...
NO
DC 5V? Is the Trans output power
NO
about AC 13V? Troubleshooting Guide LWC1264PBG/PHG, LWC1264VBS/QBG
Possible Trouble 1 The unit does not operate. output?
Service Manual - Page 18
... 15
NO
of
NO
CN-DISP2 all right? Troubleshooting Guide
Possible Trouble 4 FAN does not operate. Is the voltage NO.2 or 3
NO
of IC7 DC 5V?
YES
• Exchange Receiver Ass'y.
• Exchange IC1. • Exchange IC7.
• Exchange the battery. ••CChheecckkththeePPCCBBppaattteterrnn.. • Connect connector to
CN-DISP2 exactly.
18 Window Air Conditioner
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