LG LW1200ERY3, LW1200PRY3, LW1000PRY3, LW120CS, LW100CS Service Manual

LG

Room

Air Conditioner

SERVICE MANUAL

LG

MODEL: LW1200PR

LW1200ER
LW1000PR
LW1000ER
LW1004ER
LWL1210WAL
LWL1230WAL
WM-1231
LW1000ERY3
LB1000ER
LB1200ER
LW100CS
LW120CS
LW1000PRY3
LW1200PRY3
LW1200ERY3

CAUTION

website http://www.lgservice.com

• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.

• ONLY FOR AUTHORIZED SERVICE PERSONNEL.

2 Room Air Conditioner

Air Conditioner Service Manual

TABLE OF CONTENTS

Safety Precautions..........................................................................................................................................3

Dimensions .....................................................................................................................................................5

Outside Dimensions...................................................................................................................................5

Product Specifications ..................................................................................................................................6

Installation.......................................................................................................................................................7

Select the Best Location ............................................................................................................................7

Installation Check.......................................................................................................................................7

How to Secure the Drain Pipe....................................................................................................................7

How to Install..............................................................................................................................................8

Suggested Tool Requirements...................................................................................................................9

Operation ......................................................................................................................................................12

Function of Controls.................................................................................................................................12

Disassembly..................................................................................................................................................15

Mechanical Parts......................................................................................................................................15

Air handling Parts.....................................................................................................................................16

Electrical Parts .........................................................................................................................................17

Refrigerating Cycle...................................................................................................................................19

Schematic Diagram.......................................................................................................................................22

Electronic Control Device.........................................................................................................................22

Wiring Diagram.........................................................................................................................................24

Components Location ..............................................................................................................................25

Troubleshooting Guide.................................................................................................................................27

Pipeing System ........................................................................................................................................27

Troubleshooting Guide .............................................................................................................................28

Electrical Parts Troubleshooting Guide ....................................................................................................30

Electrical Parts .........................................................................................................................................34

Exploded View ..............................................................................................................................................40

Replacement Parts List ................................................................................................................................41

Service Manual 3

Safety Precautions

Safety Precautions

To prevent injury to the user or other people and property damage, the following instructions must
be followed.

■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.

■ Meanings of symbols used in this manual are as shown below.

WARNING

CAUTION

This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to property only.

Be sure not to do.

Be sure to follow the instruction.

WARNING

■ Installation

Do not use damaged power cord plugs, or a
loose socket.

• There is risk of fire or electric shock.

Always use the power plug and socket with
the ground terminal.

• There is risk of electric shock.

˚

C

TIMER

POW

ER

M

ODE

T

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F

A

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4 Room Air Conditioner

Safety Precautions

Do not modify or extend the power cord.

• There is risk or fire or electric shock.

Do not install, remove, or re-install the unit by
yourself(customer).

• There is risk of fire, electric shock, explosion, or injury.

Be cautious when unpacking and installing
the product.

• Sharp edges could cause injury. Be especially careful
of the case edges and the fins on the condenser and
evaporator.

Do not store or use flammable gas or com­bustibles near the air conditioner.

• There is risk of fire or failure of product.

Be sure the installation area does not deterio­rate with age.

• If the base collapses, the air conditioner could fall with
it, causing property damage, product failure, and per­sonal injury.

Sharp
edges

Gasolin

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Fan

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Co

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Service Manual 5

Dimensions

Dimensions

D

W

H

˚C

TIMER POWERMODE

TEMP

FAN

SPEED

F1 LOW
F2 MED
F3 HIGH

Dry Timer

Fan

Energy
Saver

Cool

W mm(inch) 600(23 5/8)

H mm(inch) 380(14 31/32)
D mm(inch) 567(22

5

/16)

Model

Dimension

All Models

Outside Dimensions

This symbol alerts you to the risk of electric shock.

This symbol alerts you to hazards that could cause harm to the
air conditioner.

This symbol indicates special notes.

NOTICE

Symbols Used in this Manual

6 Room Air Conditioner

Specfications

Product Specifications

* DB : Dry Bulb
**

WB : Wet Bulb

NOTE: Please refer to Label Quality on the product since this specification may be changed for improving performance.

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)

1ø, 115, 60Hz 1ø, 208/230, 60Hz 1ø, 115, 60Hz

12,300 12,000 10,000 12,000

1,140 1,110 910 1,220

10.2 5.2 8.2 11.0

10.8 10.8 11.0 9.8

26.7(DB)* 19.4(WB)**

35(DB)* 23.9(WB)**
540g (19.0 oz) 550g (19.4 oz) 480(17.0 oz) 470(16.6 oz)
3 ROW 12 STACKS, SLIT-FIN TYPE

2 ROW 10 STACKS, LG-LOUVER TYPE

2 ROW 12 STACKS

2 ROW 17 STACKS, L-BENDED TYPE

2 ROW 17 STACKS, LG-LOUVER TYPE

2 ROW17 STACKS

TURBO FAN

PROPELLER TYPE FAN WITH SLINGER RING

3/3

6 POLES

REMOTE CONTROLLER

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

79/36

235/8x 1431/32 x 225/16

600 x 380 x 560

MODELS

ITEMS

OPERATING
CONDITION

LW1200PR
LW1200ER

LWL1210WAL

LW1200ERY3

LW120CS

LB1200ER

LW1200PRY3

LWL1230WAL

LB1000ER
LW1004ER
LW1000PR
LW1000ER

LW1000ERY3

LW100CS

LW1000PRY3

WM-1231

Service Manual 7

Installation

Installation

Select the Best Location

Installation Check

How to Secure the Drain Pipe

1.To prevent vibration and noise, make sure the unit is
installed securely and firmly.

2.Install the unit where the sunlight does not shine direct­ly on the unit.

3.The outside of the cabinet must extend outward for at
least 12" and there should be no obstacles, such as a
fence or wall, within 20" from the back of the cabinet
because it will prevent heat radiation of the condenser.
Restriction of outside air will greatly reduce the cooling
efficiency of the air conditioner.

CAUTION: All side louvers of the cabinet

must remain exposed to the outside of
the structure.

4.Install the unit a little slanted so the back is slightly lower
than the front (about 1/

2"). This will help force con-densed

water to the outside.

5.Install the unit from the bottom about 30"~60" above the
floor level.

The setting conditions must be checked prior to initial starting.
The following items are especially important checking points when the installation is finished.

1. Grounding wire (Green or Green and Yellow) is provided in the power cord. The green wire must be grounded.

2. Connect to a single-outlet 15A circuit.

(or 20A circuit for Electric Heater Model)

3. To avoid vibration or noise, make sure the air conditioner is installed securely.

4 Avoid placing furniture or draperies in front of the air inlet and outlet.

In humid weather, excess water may cause the BASE PAN to overflow. To drain
the water, remove the DRAIN CAP and secure the DRAIN PIPE to the rear hole
of the BASE PAN. Press the drain pipe into the hole by pushing down and away
from the fins to avoid injury.

Optional

1. Install the drain pan over the corner of the cabinet where you removed

the plug with 4 (or 2) screws.

2. Connect the drain hose to the outlet located at the bottom of the drain

pan. You can purchase the drain hose or tubing locally to satisfy your
particular needs. (Drain hose is not supplied).

3. Select the most appropriate connection from among the following figures

(by considering the hole of the unit) to fit drain pan to your own unit.

AWNING

COOLED AIR

HEAT

RADIATION

30"~60"

ABOUT 1/2"

Over 20"

FENCE

Drain pipe

Drain cap

Fig. 4

Fig. 3

Fig. 2

DRAIN
PAN

DRAIN HOSE

Fig. 1

CABINET

SCREW

Figure 1

8 Room Air Conditioner

Installation

How to Install

When Using Gasket

When Using Installation Kits

1. Window Requirements

This unit is designed for installation in
standard double hung windows with actual opening
widths from 27" to 39".
The top and bottom window sash must open suffi­ciently to allow a clear vertical opening of 16" from
the bottom of the upper sash to the window stool.

2. Installation Kits Contents

A

B

2

A

RIGHT SIDE

HORIZONTAL
LINE

B

DE

F

H

3

4

2

1

˚C

TIMER POWERMODE

TEMP

FAN
SPEED

F1 LOW
F2 MED
F3 HIGH

Dry Timer

Fan

Energy
Saver

Cool

˚C

TIMER POWERMODE

TEMP

FAN
SPEED

F1 LOW
F2 MED
F3 HIGH

Dry Timer

Fan

Energy
Saver

Cool

1. WINDOW (WIDTH-A, HEIGHT-B)

2. GASKET

3. WALL

4. DETAILS 5.1 x 30 ROUND HEAD WOOD
SCREWS

ABCDE F HI

625mm 392mm 280mm 30mm 0~25mm OVER 420mm 5~10mm -5~5mm

(245/8") (157/16") (111/32") (11/16") (0~1") (OVER 1617/32") (3/16"~3/8") (-3/16"~3/16")

27" to 39"

16" min

Stool

Interior wall

23

5

/8" min

(Without frame curtain)

Offset

1

/2" to 11/4"

Sill

Exterior

■ Top retainer bar is in
the product package.

NO. NAME OF PARTS Q'TY

1 FRAME CURTAIN 2
2 SILL SUPPORT 2
3 BOLT 2
4 NUT 2
5

SCREW(TYPE A) (10mm(2/5

"))

16

6

SCREW(TYPE B)

3

7

SCREW(TYPE C)

5
8 FOAM-STRIP 1
9

FOAM-PE (600mm x 25mm x 2mm)

1

10

WINDOW LOCKING BRACKET

1

11

FOAM-PE

(920mm x 30mm x 2mm)

1

12 DRAIN PIPE 1
13 FRAME GUIDE 2

D5.1mm(0.2")/16mm(0.63")

D4.1mm(0.17")/16mm(0.63")

2 3 4

13

1

10

12

8 11

765

9

Service Manual 9

Installation

Suggested Tool Requirements

SCREWDRIVER (+, -), RULER, KNIFE, HAMMER, PENCIL, LEVEL

Preparation of Chassis

1. Remove the screws that fasten the cabinet at both
sides and at the back.

2. Slide the unit out from the cabinet by gripping the
base pan handle and pulling forward while
bracing the cabinet.

3. Cut the window sash seal to the proper length. Peel
off the backing and attach the Foam-Pe to the
underside of the window sash.

4. Remove the backing from the top upper guide
Foam PE and attach it to the bottom of the Upper
Guide .

5. Attach the upper guide onto the top of the cabinet
with 3 type A screws.

6. Insert the Frame Guides into the bottom of the
cabinet.

7. Insert the Frame Curtain into the upper guide
and Frame Guides .

8. Fasten the curtains to the unit with 4 Type A screws
at the both sides.

Cabinet Installation

1. Open the window. Mark a line on center of the win­dow stool (or desired air conditioner location).
Carefully place the cabinet on the window stool and
align the center mark on the front angle with the
center line marked in the window stool.

2. Pull the bottom window sash down behind the
upper guide until it meets.

Do not pull the window sash down so
tightly that the movement of Frame
Curtain is restricted.

NOTICE

Shipping
Screws

9

10

13

(Type A)

(Type A)

5

5

11

11

9

5

EPS Material

Upper Guide

Window stool

Front Angle

Window Sash Upper guide

9

Frame Curtain

1

Foam-pe

10

Foam-pe

13

Cabinet

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HI
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1
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OW
F2
M

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D

F3
H

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A
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P
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D

Figure 2

Figure 3

10 Room Air Conditioner

Installation

INDOOR OUTDOOR

Sill Support

Nut

Bolt

2

4

3

INDOOR OUTDOOR

12

7

5

Frame Guide

About 1/2"

Screw(Type A)

Cabinet

6

2

About 1/2"

Screw(Type B)5Screw(Type A)

Sill support

Type C

Sash track

Front Angle

Screw(Type B)

6

Sill support

2

3. Loosely assemble the sill support using the parts
in

Figure 4.

4. Select the position that will place the sill
support near the outer most point on sill
(See

Figure

4)

Be careful when you install the cabinet
(Frame Guides

are broken easily).

5. Attach the sill support to the cabinet track hole in
relation to the selected position using
2 Type A screws in each support (See Figure 5).

6. The cabinet should be installed with a very slight
tilt (about 1/2") downward toward the outside
(See Figure 6).
Adjust the bolt and the nut of Sill Support for
balancing the cabinet.

7. Attach the cabinet to the window stool by
driving the screws (Type B) through the front
angle into window stool (5/8").

8. Pull each Frame Curtain properly to each win­dow sash track, and repeat step 2.

9. Attach each Frame Curtain to the window sash
by using screws (Type C).
(See

Figure

7)

NOTICE

Figure 4

Figure 5

Figure 6

Figure 7

Service Manual 11

Installation

Screw(Type A)

Screw(Type A)

Power cord

13

8

Foam-Strip

˚C

T
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P

F
1
L

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F
2
M

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3
H
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T

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1

L

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F

2

M

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F

3

H

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IM

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A

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P

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D

˚C

TIMER POWERMODE

TEMP

FAN

SPEED

F1 LOW
F2 MED
F3 HIGH

Dry Timer

Fan

Energy

Saver

Cool

10. Slide the unit into the cabinet.(See Fig. 8)

CAUTION:

For security purpose, reinstall

screws (Type A) at the cabinet's sides.

11. Cut the Foam-Strip to the proper length and insert
between the upper and lower window sash.
(See Fig. 9)

12. Attach the window Locking Bracket with a type C
screw. (See Fig. 10)

13. Attach the front grille to the cabinet by inserting the
tabs on the grille into the tabs on the front of the cab­inet. Push the grille in until it snaps into place.(See
Fig. 11)

14. Lift the inlet grille and secure it with a type A screw
through the front grille.(See Fig. 12)

Figure 11

Figure 8

Figure 9

Figure 10

Figure 13

Figure 12

12 Room Air Conditioner

Operation

• Designed for COOLING ONLY.

• Powerful and whispering cooling.

• Slide-in and slide-out chassis for the simple instal-

lation and service.

• Low air-intake, top cooled-air discharge.

• Built-in adjustable Thermistor

• Washable one-touch filter

• Compact size

• Reliable and efficient rotary compressor

Power

Temp

Fan Speed

Timer Mode

1

2

3

4

5

˚C

TIMER POWERMODE

TEMP

FAN

SPEED

F1 LOW
F2 MED
F3 HIGH

Dry Timer

Fan

Energy

Saver

Cool

1

2

6

3 45

TIMER MODE TEMP

POWER

FAN

SPEED

°F

12345

F1 LOW
F2 MED
F3 HIGH

COOLDRY

ENERGY

SAVER

FANTIMER

6

WM-1231, LW1000ERY3, LB1000ER
LB1200ER/LW1200ERY3

LW1004ER LW1200ER/LW1000ER

AIR

PURIFIER

CLEAN
FILTER

TIMER MODE

TEMP

POWER

FAN

SPEED

COOL

INDOOR DESIRED

ENERGY

SAVER

FAN

FAN

DRY

12345

6

DISPLAY REMOTE CONTROL

PRECAUTION:

The Remote Control unit will not
function properly if bright light strikes the sensor window of the air conditioner or if
there are obstacles between the Remote Control unit and the air conditioner.

POWER BUTTON

To turn the air conditioner ON, push the button. To turn the air conditioner OFF, push the button again.
This button takes priority over any other buttons.

ROOM TEMPERATURE SETTING BUTTON

This button can automatically control the temperature of the room. The temperature can be set within a range of 60°F to
86°F by 1°F. (16°C to 30°C by 1°C)
Select the lower number for lower temperature of the room.

OPERATION MODE SELECTION BUTTON

Every time you push this button, it will shift among COOL, ENERGY SAVER, FAN and DRY.

-

Energy Saver: If Energy Save mode is selected, the fan stops when the compressor stops cooling.a

Approximately every 3 minutes the fan will turn on and check the room air to determine if cooling is needed.

FAN SPEED SELECTOR

Every time you push this button, it is set as follows.
(Hi [F3] ➔ Low [F1] ➔ Med [F2] ➔ Hi [F3] ➔ Low [F1] ➔...)

ON/OFF TIMER BUTTON

You can set the time when the unit will turn on or turn off automatically by pressing the timer button. If the unit is operating,
this button controls the time it will be turned off. If the unit is off state, this button controls the time it will start. Every time
you push this button, the remaining time will be set as follows.

- Stopping operation
(1Hour ➔ 2Hours ➔ 3Hours ➔ 4Hours ➔ 5Hours ➔ 6Hours ➔ 7Hours ➔ 8Hours ➔ 9Hours ➔ 10Hours ➔ 11Hours ➔
12Hours ➔ 0Hour ➔ 1Hour ➔ 2Hours ➔... )

- Starting operation
(1Hour ➔ 2Hours ➔ 3Hours ➔ 4Hours ➔ 5Hours ➔ 6Hours ➔ 7Hours ➔ 8Hours ➔ 9Hours ➔ 10Hours ➔ 11Hours ➔
12Hours ➔ off ➔ 1Hour ➔ 2Hours ➔ ... )

REMOCON SIGNAL RECEIVER

6

6

Operation

Function of Controls

POWER BUTTON

To turn the air conditioner ON, push the button. To turn the air conditioner OFF, push the button again.
This button takes priority over any other buttons.

ROOM TEMPERATURE SETTING BUTTON

This button can automatically control the temperature of the room. The temperature can be set within a range of 60°F to
86°F by 1°F. (16°C to 30°C by 1°C)
Select the lower number for lower temperature of the room.

OPERATION MODE SELECTION BUTTON

Every time you push this button, it will shift among COOL, ENERGY SAVER, FAN and DRY as follows.

-

Energy Saver: If Energy Save mode is selected, the fan stops when the compressor stops cooling.

Approximately every 3 minutes the fan will turn on and check the room air to determine if cooling is needed.

Service Manual 13

Operation

Precaution: The Remote Control unit will not function properly if strong light strikes the sensor window of the air

conditioner or if there are obstacles between the Remote Control unit and the air conditioner.

REMOTE CONTROL

DISPLAY

LW1200PR, LW1000PR, LWL1210WAL,
LWL1230WAL, LW100CS, LW120CS

6

DEFROST

HEATCOOL

FAN

DRY

FAN

ENERGY

SAVER

INDOOR DESIRED

FAN

TIMER MODE TEMP

SPEED

AIR

PURYFIER

AUTO

RESTART

POWER

LW1000PRY3, LW1200PRY3

COOL

INDOOR DESIRED

TIMER MODE

12345

FAN

FAN

FAN

SPEED

DRY

ENERGY

SAVER

AIR

PURIFIER

CLEAN
FILTER

AIR

PURIFIER

6

TEMP

POWER

127345

AIR

PURIFIER

Air

Power

7 1

4
8
5

Purifier

Temp

Fan Speed

Sleep Mode

Auto

Swing

Timer

2

3

FAN DRY HEAT

COOL

FAN

INDOOR DESIRED

COOL

DEFROST

ENERGY

SAVER

AIR

PURYFIER

AUTO

RESTART

COOL

FAN DRY HEAT

FAN

INDOOR DESIRED

ENERGY SAVER

DEFROST

ENERGY

SAVER

AIR

PURYFIER

AUTO

RESTART

COOL

DRY HEAT

FAN

FAN

INDOOR DESIRED

DEFROST

ENERGY

SAVER

AIR

PURYFIER

AUTO

RESTART

FAN DRY

FAN

COOL

DRY

FAN

INDOOR DESIRED

HEAT

DEFROST

ENERGY

SAVER

AIR

PURYFIER

AUTO

RESTART

14 Room Air Conditioner

Operation

FAN SPEED SELECTOR

Every time you push this button, it is set as follows.
(Hi ➔ Low ➔ Med ➔ Hi ➔ Low ➔...)

ON/OFF TIMER BUTTON

You can set the time when the unit will turn on or turn off automatically by pressing the timer button. If the unit is operating,
this button controls the time it will be turned off. If the unit is off state, this button controls the time it will start. Every time
you push this button, the remaining time will be set as follows.

- Stopping operation
(1Hour ➔ 2Hours ➔ 3Hours ➔ 4Hours ➔ 5Hours ➔ 6Hours ➔ 7Hours ➔ 8Hours ➔ 9Hours ➔ 10Hours ➔ 11Hours ➔

12Hours ➔ 0Hour ➔ 1Hour ➔ 2Hours ➔... )

- Starting operation
(1Hour ➔ 2Hours ➔ 3Hours ➔ 4Hours ➔ 5Hours ➔ 6Hours ➔ 7Hours ➔ 8Hours ➔ 9Hours ➔ 10Hours ➔ 11Hours ➔

12Hours ➔ off ➔ 1Hour ➔ 2Hours ➔ ... )

REMOCON SIGNAL RECEIVER

AIR PURIFIER

• Press the Air Purifier button.
Operation will start when the button is pressed and stop when the button is pressed again.

• Set the fan speed with the remote control. You can select the fan speed in three steps high, low or medium.
Each time the button is pressed, the fan speed mode is shifted.

• If you press the only Air Purifier button, only air purifying operates.
Then, fan speed is low. You can select the fan speed in three steps high, low or medium.
Each time the button is pressed, the fan speed mode is shifed.

SLEEP MODE

• Press the sleep mode button to set the time you want the unit to turn off automatically.

• Every time you push this button, the remaining time will be set as follows.

(1Hour ➔ 2Hours ➔ 3Hours ➔ 4Hours ➔ 5Hours ➔ 6Hours ➔ 7Hours ➔ 0Hour ➔ 1Hour ➔ 2Hours ➔

...

)

• The temperature setting will be raised by 2˚F in 30 minutes and by 4˚F in 1 hour to prevent overcooling during sleep.

6

6

7

7

8

8

HIGH LOW MID

COOL

AIR

PURYFIER

AUTO

RESTART

ENERGY

SAVER

DRY HEAT

DEFROST

INDOOR DESIRED

FAN

FAN COOL

AIR

PURYFIER

AUTO

RESTART

ENERGY

SAVER

DRY HEAT

DEFROST

INDOOR DESIRED

FAN

FANCOOL

AIR

PURYFIER

AUTO

RESTART

ENERGY

SAVER

DRY HEAT

DEFROST

INDOOR DESIRED

FAN

FAN