LG LWHD1800R, LWHD1500ER Service Manual

LG

Room

Air Conditioner

SERVICE MANUAL

LG

MODELS: LWHD1500ER,LWHD1800R,L1804R

CAUTION

website http://www.lgappliances.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

Cabinet Installation.....................................................................................................................................9

Operation ......................................................................................................................................................11

Function of Controls.................................................................................................................................11

Disassembly..................................................................................................................................................12

Mechanical Parts......................................................................................................................................12

Air Handling Parts ....................................................................................................................................13

Electrical Parts .........................................................................................................................................14

Refrigerating Cycle...................................................................................................................................16

Schematic Diagram.......................................................................................................................................19

Electronic Control Device.........................................................................................................................19

Wiring Diagram.........................................................................................................................................20

Components Location ..............................................................................................................................21

Troubleshooting Guide.................................................................................................................................22

Piping System ..........................................................................................................................................22

Troubleshooting Guide.............................................................................................................................23

Electrical Parts Troubleshooting Guide....................................................................................................25

Electric Parts............................................................................................................................................29

Exploded View ..............................................................................................................................................35

Replacement Parts List ................................................................................................................................36

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 properties 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.

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

Service Manual 5

Dimensions

Dimensions

D

W

H

'

F

TIMER POWERMODE

TEMP

FAN

SPEED

F1 LOW
F2 MED
F3 HIGH

Dry Timer

Fan

Energy
Saver

Cool

W mm(inch) 660(25 31/32)

H mm(inch) 428(16

27

/32)

D mm(inch) 680(26

27

/32)

Model

Dimension

HBLG1203R

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 sepcification may be

changed for improving performance.

25

31

/32 X 16 27/32 X 26 27/32

ITEMS

MODELS

LWHD1500ER

LWHD1800R L1804R

POWER SUPPLY

CAPACITY (BTU/h)

COOLING

HEATING

OPERATING
CONDITION

REFRIGERANT(R-22) CHARGE
EVAPORATOR
CONDENSER

FAN,INDOOR
FAN,OUTDOOR

FAN SPEEDS,FAN/COOLING/HEATING
FAN MOTOR

INPUT (W)
RUNNING CURRENT (A)

E.E.R (BTU/W.h)
CAPACITY (BTU/h)
INPUT (W)

RUNNING CURRENT (A)
E.E.R (BTU/W.h)

INDOOR(℃)

OUTDOOR(℃)

1Φ，115V，60Hz 1Φ，208/230V，60Hz

15,000
1380 1800/1850

12.0 9.0/8.3

10.8 9.7/9.7

- -

- -

- -

- -

26.7(DB)* 19.4(WB)**
35(DB)* 23.9(WB)**

3 ROW 11 STACKS, LOUVER-FIN TYPE

2 ROW 19 STACKS,L-BENDED TYPE

TURBO FAN

PROPELLER TYPE FAN WITH SLINGER RING

3/3

6 POLES

17,500/18,000

710g(24.9oz)680g(24.0oz)

OPERATION CONTROL
ROOM TEMP CONTROL

AIR DIRECTION CONTROL
CONSTRUCTION

PROTECTOR

POWER CORD
DRAIN SYSTEM

NET WEIGHT
OUTSIDE DIMENSION

(W X H X D)

REMOTE CONTROLLER

THERMISTOR

VERTICAL LOUVER (RIGHT & LEFT)
HORIZONTAL LOUVER (UP & DOWN)

SLIDE IN -OUT CHASSIS

COMPRESSOR

FAN MOTOR

(lbs/kg)
(inch)

(mm)

ATTACHMENT PLUG (CORD -CONNECTED TYPE)

DRAIN PIPE OR SPLASHED BY FAN SLINGER

126/57

OVERLOAD PROTECTOR

INTERNAL THERMAL PROTECTOR

3 WIRE WITH GROUDING

660 x 428 x 680

Service Manual 7

Installation

Installation

Select the Best Location

Installation Check

How to Secure the Drain Pipe

1. To avoid 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.
If the unit receives direct sunlight, build an awning to shade the
cabinet.

3. There should be no obstacle, like a fence, within 20" which
might restrict heat radiation from the condenser.

4. To prevent reducing performance, install the unit so that louvers
of the cabinet are not blocked.

5. Install the unit a little obliquely outward not to leak the con­densed water into the room (about 1/2" or 1/4 bubble with level).

6. Install the unit with its bottom portion 30~60" above the floor
level.

7. Stuff the foam between the top of the unit and the wall to pre­vent air and insects from getting into the room.

8. The power cord must be connected to an independent circuit.
The green wire must be grounded.

9. Connect the drain tube to the base pan hole in the rear side if
you need to drain (consult a dealer).
Plastic hose or equivalent may be connected to the drain tube.

The setting conditions must be checked prior to initial starting.
The following items are especially important check 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.

About 1/2"

Over 20"

HEAT

RADIATION

FENCE

AWNING

FOAM

COOLED

AIR

30-60"

Level

1/4 Bubble

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 Installation Kits

1. Window Requirements

This unit is designed for installation in
standard double hung windows with actual opening
widths from 29" to 41".
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

29" to 41"

18" min

Stool

Interior wall

26" min

(Without frame curtain)

Offset
Less 1

1

/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)

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

3

7 SCREW(TYPE C)

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

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

1

10

1213

2 3 4

765

8 11

9

Service Manual 9

Installation

Cabinet Installation

1. Open the window. Mark a line on the center of the window
stool between the side window stop moldings.
Loosely attach the sill bracket to the support bracket using
the carriage bolt and the lock nut.

2. Attach the sill bracket to the window sill using the screws
(Type B).
Carefully place the cabinet on the window stool and align the
center mark on the bottom front with the center line marked
window stool.

3. Using the M-screw and the lock nut, attach the support
bracket to the cabinet track hole. Use the first track hole
after the sill bracket on the outer edge of the window sill.
Tighten the carriage bolt and the lock nut. Be sure the cabi­net slants outward.

CAUTION: Do not drill a hole in the

bottom pan. The unit is designed to
operate with approximately 1/2" of
water in bottom pan.

4. Pull the bottom window sash down behind the Top retainer
bar until they meet.

1. Do not pull the window sash down so tightly that the move­ment of Frame curtain is restricted. Attach the cabinet to the
window stool by driving the screws (Type B) through the
cabinet into window stool.

2. The cabinet should be installed with a very slight tilt

downward toward the outside.

NOTICE

Support
Bracket

Lock nut

Sill
Bracket

Carriage
Bolt
(M-Screw)

Front angle

Window stool

Window sash

Top retainer bar

Cabinet

Foam-PE

Frame curtain

Screw(Type B)

Front Angle

Sash track

Foam-PE

Cabinet
Track hole

Support
Bracket

Carriage bolt
and lock nut

Machine screw (Type D)
and lock nut

Outer edge
of window
sill

Screw(Type B)

Sill bracket

Top
retainer
bar

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

10 Room Air Conditioner

Installation

5. Pull each Frame curtain fully to each window sash
track, and pull the bottom window sash down behind
the Top retainer bar until it meets.

6. Attach each Frame curtain the window sash by using
screws (Type C). (See Fig. 7)

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

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

9. Attach the Window locking bracket with a screw
(Type C). (See Fig. 10)

10. 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)

11. Lift the inlet grille and secure it with a screw (Type A)

through the front grille. (See Fig. 11)

12. Window installation of room air conditioner is now

completed.

Power Cord

Screw (Type A)

Screw

Window locking
bracket

Foam-Strip

Screw(Type C)

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

CAUTION: For security purpose,
reinstall screws (Type A) at cabinet's
sides.

Service Manual 11

Operation

• Designed for COOLING ONLY.

• Powerful and quiet 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

• Equipped with reliable and efficient rotary

compressor.

REMOTE CONTROL

DISPLAY

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.

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

Cool

Energy

Saver

Fan

Dry Timer

3 45

F1 LOW
F2 MED
F3 HIGH

TEMP

TIMER POWERMODE

FAN

SPEED

'

F

1

6

2

Power

Temp

Fan Speed

Timer Mode

5

1

2
4

3

12 Room Air Conditioner

Disassembly

Disassembly

Mechanical Parts

— Before the following disassembly, CONTROL BOX set to OFF and disconnect the power cord.

1. Front Grille

1. Open the lnlet grille downward and remove the air filter.

2. Remove the screw that fastens the front grille.(See
Figure 13)

3. Pull the front grille from the right side.

4. Remove the front grille.(There are 4 hooks.)

5. Re-install the components by referring to the removal
procedure, above.

2. Cabinet

1. After disassembling the FRONT GRILLE, remove the 2
screws that fasten the cabinet at both sides.

2. Remove the 2 screws that fasten the cabinet at back.

3. Pull the base pan forward. (See Figure 14)

4. Remove the cabinet.

5. Re-install the components by referring to the removal
procedure, above.

3. Control Box

1. Remove the front grille. (Refer to section 1)

2. Remove the cabinet. (Refer to section 2)

3. Remove the 2 screws which fasten the power cord.

4. Disconnect the grounding screw from the evaporator
channel.

5. Remove the 1 screw that fastens the control box cover.

6. Remove the housing that connects PCB and motor
wire in the control box.

7. Disconnect the housing that connects Plazma Air
Purifier.(Optional)

8. Remove the screw at left cover of filter case and open
the cover to remove inner screw. (Optional)

9. Remove the nut that fastens the terminal cover.

10. Remove the terminal cover.

11. Remove all the leads from the overload protector.

12. Discharge the capacitor by placing a 20,000 ohm

resistor across the capacitor terminals.

13. Raise the control box upward completely.

(See Figure 15)

14. Re-install the components by referring to the removal

procedure, above.
(Refer to the wiring diagram found on page 22 in this
manual and on the control box.)

P
O

W

E
R

M
O

D
E

F
A

N
S
P

E

E

D

T

IM

E
R

˚C

T

E

M

P

F

1

L
O

W
F
2

M
E
D

F
3

H
I
G
H

D

r
y

T
i

m
e

r

F
a
n

E
n

e
r
g
y

S

a
v
e
r

C
o
o

l

D
E
F

R
O
S

T

H

E
A

T

C
O
O

L

I
N

D
O
O
R

D

E
S
I
R
E

D

E
N

E
R
G

Y

S
A

V
E
R

A

I
R

P
U
R

Y
F
I
E

R

A

U
T
O

R
E
S

T
A
R

T

F
A

N

F
A
N

D

R
Y

P

OW

ER

MODE

FAN

SPEED

TIMER

˚
C

TEMP

F
1
L
O
W

F

2
M
E
D

F

3
H
I
G
H

D
ry

T
im
e

r

F

a
n

E
n
e

r
g

y
S
a

v

e

r

C

o

o

l

Figure 13

Figure 15Figure 15

Figure 14