LG LWG0760ACG / LWG0760BCG / LWG0760PCG / LWG0760QCG / LWG0960ACG / LWG0960BCG / LWG0960PCG / LWG0960QCG / LWG0720ACG / LWG0720NCG / LWG0820ACG / LWG0820PCG / LWG0821ACG / LWG0821DCG / WG0760ACG Service Manual ▷ View online
Room Air Conditioner
SERVICE MANUAL
CAUTION
-
BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
PRECAUTIONS IN THIS MANUAL.
-
ONLY FOR AUTHORIZED SERVICE PERSONNEL.
MODEL: LWG0760ACG
LWG0760BCG
LWG0760PCG
LWG0760QCG
LWG0960ACG
LWG0960BCG
LWG0960PCG
LWG0960QCG
LWG0720ACG
LWG0720NCG
LWG0820ACG
LWG0820PCG
LWG0821ACG
LWG0821DCG
—2—
1. PREFACE
1.1 SAFETY PRECAUTIONS................................2
1.2 INSULATION RESISTANCE TEST .................2
1.3 SPECIFICATIONS...........................................3
1.4 FEATURES......................................................6
1.5 CONTROL LOCATIONS .................................6
2. DISASSEMBLY INSTRUCTIONS
2.1 MECHANICAL PARTS ....................................9
2.1.1 FRONT GRILLE .....................................9
2.1.2 CABINET ................................................9
2.1.3 CONTROL BOX .....................................9
2.2 AIR HANDLING PARTS ................................10
2.2.1 AIR GUIDE AND BLOWER ..................10
2.2.2 FAN AND SHROUD .............................10
2.3 ELECTRICAL PARTS....................................11
2.3.1 OVERLOAD PROTECTOR ..................11
2.3.2 COMPRESSOR....................................11
2.3.3 CAPACITOR.........................................11
2.3.4 POWER CORD ....................................12
2.3.5 THERMOSTAT .....................................12
2.3.6 ROTARY SWITCH ...............................12
2.3.7 MOTOR ................................................12
2.4 REFRIGERATION CYCLE ............................13
2.4.1 CONDENSER.......................................13
2.4.2 EVAPORATOR.....................................13
2.4.3 CAPILLARY TUBE ...............................13
3. INSTALLATION
3.1 SELECT THE BEST LOCATION...................16
3.2 CHECK OF INSTALLATION..........................16
3.3 HOW TO DRAIN............................................16
3.4 HOW TO INSTALL ........................................17
3.5 HOW TO USE THE REVERSIBLE INLET GRILLE...18
4. TROUBLESHOOTING GUIDE
4.1 OUTSIDE DIMENSIONS ...............................19
4.2 PIPING SYSTEM...........................................19
4.3 TROUBLESHOOTING GUIDE ......................20
5. SCHEMATIC DIAGRAM
5.1 CIRCUIT DIAGRAM ......................................29
5.2 ELECTRONIC CONTROL DEVICE...............33
5.3 COMPONENTS LOCATION
(OF MAIN P.C.B ASM) ..................................35
5.4 COMPONENTS LOCATION
(OF DISPLAY P.C.B ASM) ............................35
6. EXPLODED VIEW
..................................36
7. REPLACEMENT PARTS LIST
........37
1. PREFACE
This
SERVICE MANUAL
provides various service information, including the mechanical and electrical
parts etc. This room air conditioner was manufactured and assembled under a strict quality control system.
The refrigerant is charged at the factory. Be sure to read the safety precautions prior to servicing the unit.
The refrigerant is charged at the factory. Be sure to read the safety precautions prior to servicing the unit.
1.1 SAFETY PRECAUTIONS
1. When servicing the unit, set the ROTARY SWITCH
or POWER SWITCH to OFF and unplug the power
cord.
cord.
2. Observe the original lead dress.
If a short circuit is found, replace all parts which
have been overheated or damaged by the short
circuit.
have been overheated or damaged by the short
circuit.
3. After servicing the unit, make an insulation resis-
tance test to protect the customer from being
exposed to shock hazards.
exposed to shock hazards.
1.2 INSULATION RESISTANCE TEST
1. Unplug the power cord and connect a jumper
between 2 pins (black and white).
2. The grounding conductor (green) is to be open.
3. Measure the resistance value with an ohm meter
3. Measure the resistance value with an ohm meter
between the jumpered lead and each exposed
metallic part on the equipment at all the positions
(except OFF) of the ROTARY SWITCH.
metallic part on the equipment at all the positions
(except OFF) of the ROTARY SWITCH.
4. The value should be over 1M
Ω
.
CONTENTS
—3—
POWER SUPPLY
COOLING CAPACITY
(Btu/h)
INPUT
(W)
RUNNING CURRENT
(A)
E.E.R
(BTU/W.h)
INDOOR
(°C)
OUTDOOR (°C)
REFRIGERANT (R-22) CHARGE
EVAPORATOR
CONDENSER
FAN, INDOOR
FAN, OUTDOOR
FAN SPEEDS, FAN/COOLING
FAN MOTOR
OPERATION CONTROL
ROOM TEMP. CONTROL
AIR DIRECTION CONTROL
CONSTRUCTION
PROTECTOR
COMPRESSOR
FAN MOTOR
POWER CORD
DRAIN SYSTEM
NET WEIGHT
(lbs/kg)
OUTSIDE DIMENSION
(inch)
(W x H x D)
(mm)
7,000
775
3.4
9.0
27(DB)*
19(WB)**
35(DB)*
24(WB)**
290g (10.2 Oz)
2 ROW 14 STACKS, SLIT-FIN TYPE
1 ROW 16 STACKS, LOUVERED-FIN TYPE
BLOWER
PROPELLER TYPE FAN WITH SLINGER-RING
2/3
3/3
4 POLES
ROTARY SWITCH
TOUCH & REMOTE CONTROL
THERMOSTAT
THERMISTOR
VERTICAL LOUVER (RIGHT & LEFT)
HORIZONTAL LOUVER (UP & DOWN)
SLIDE IN-OUT CHASSIS
OVERLOAD PROTECTOR
INTERNAL THERMAL PROTECTOR
(3 WIRE WITH GROUDING)
ATTACHMENT PLUG (CORD-CONNECTED TYPE)
DRAIN PIPE OR SPLASHED BY FAN SLINGER
75/34
18
1
/
2
x 13
7
/
8
x 20
11
/
16
470 x 353 x 525
1ø, 220~240V~, 50Hz
LWG0760ACG LWG0760BCG
LWG0760PCG LWG0760QCG
MODELS
ITEMS
OPERATING
CONDITION
1.3 SPECIFICATIONS
1.3.1 LWG0760ACG, LWG0760BCG, LWG0760PCG, LWG0760QCG
* DB:Dry Bulb
** WB:Wet Bulb
** WB:Wet Bulb
—4—
POWER SUPPLY
COOLING CAPACITY
(Btu/h)
INPUT
(W)
RUNNING CURRENT
(A)
E.E.R
(BTU/W.h)
INDOOR
(°C)
OUTDOOR (°C)
REFRIGERANT (R-22) CHARGE
EVAPORATOR
CONDENSER
FAN, INDOOR
FAN, OUTDOOR
FAN SPEEDS, FAN/COOLING
FAN MOTOR
OPERATION CONTROL
ROOM TEMP. CONTROL
AIR DIRECTION CONTROL
CONSTRUCTION
PROTECTOR
COMPRESSOR
FAN MOTOR
POWER CORD
DRAIN SYSTEM
NET WEIGHT
(lbs/kg)
OUTSIDE DIMENSION
(inch)
(W x H x D)
(mm)
9,000
1,000
4.2
9.0
27(DB)*
19(WB)**
35(DB)*
24(WB)**
390g (13.8 Oz)
2 ROW 14 STACKS, SLIT-FIN TYPE
2 ROW 16 STACKS, LOUVERED-FIN TYPE
BLOWER
PROPELLER TYPE FAN WITH SLINGER-RING
2/3
3/3
4 POLES
ROTARY SWITCH
TOUCH & REMOTE CONTROL
THERMOSTAT
THERMISTOR
VERTICAL LOUVER (RIGHT & LEFT)
HORIZONTAL LOUVER (UP & DOWN)
SLIDE IN-OUT CHASSIS
OVERLOAD PROTECTOR
INTERNAL THERMAL PROTECTOR
(3 WIRE WITH GROUDING)
ATTACHMENT PLUG (CORD-CONNECTED TYPE)
DRAIN PIPE OR SPLASHED BY FAN SLINGER
75/34
18
1
/
2
x 13
7
/
8
x 20
11
/
16
470 x 353 x 525
1ø, 220~240V~, 50Hz
LWG0960ACG LWG0960BCG
LWG0960PCG LWG0960QCG
MODELS
ITEMS
OPERATING
CONDITION
1.3 SPECIFICATIONS
1.3.2 LWG0960ACG, LWG0960BCG, LWG0960PCG, LWG0960QCG
* DB:Dry Bulb
** WB:Wet Bulb
** WB:Wet Bulb
