LG LWM1430BXN, LWM1430TAS, LW-136 User Manual

ROOM AIR CONDITIONER

SERVICE MANUAL

CAUTION

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

- ONLY FOR AUTHORIZED SERVICE

MODEL: LWM1430TAS,BXN/LW-136

website http://biz.lgservice.com
e-mail http://www.lgeservice.com/techsup.html

—2—

1. PREFACE

1.1 SAFETY PRECAUTIONS................................................................................................................................3

1.2 INSULATION RESISTANCE TEST.................................................................................................................3

1.3 SPECIFICATIONS...........................................................................................................................................3

1.4 FEATURES ....................................................................................................................

.................................4

1.5 CONTROL LOCATIONS............................................................................................................

.....................4

2.

DISASSEMBLY INSTRUCTIONS

2.1 MECHANICAL PARTS.............................................................................................................

.......................5

2.1.1 FRONT GRILLE...............................................................................................................

......................5

2.1.2 CABINET...................................................................................................................

.............................5

2.1.3 CONTROL BOX.....................................................................................................................................5

2.2 AIR HANDLING PARTS..................................................................................................................................6

2.2.1 COVER (AT THE TOP)..........................................................................................................................6

2.2.2 BLOWER................................................................................................................................................6

2.2.3 FAN........................................................................................................................................................6

2.2.4 SHROUD................................................................................................................................................7

2.3 ELECTRICAL PARTS .....................................................................................................................................7

2.3.1 MOTOR..................................................................................................................................................7

2.3.2 COMPRESSOR .....................................................................................................................................7

2.3.3 CAPACITOR ..........................................................................................................................................7

2.3.4 POWER CORD......................................................................................................................................8

2.3.5 THERMISTOR........................................................................................................................................8

2.3.6 SYNCHRONOUS MOTOR.....................................................................................................................8

2.4 REFRIGERATION CYCLE..............................................................................................................................9

2.4.1 CONDENSER ........................................................................................................................................9

2.4.2 EVAPORATOR ......................................................................................................................................9

2.4.3 CAPILLARY TUBE.................................................................................................................................9

3.

INSTALLATION

3.1 HOW TO INSTALL THE UNIT.......................................................................................................................12

3.2 HOW TO DRAIN............................................................................................................................................12

3.3

HOW TO USE THE REVERSIBLE INLET GRILLE

..................................................................................................................

12

3.4 WINDOW REQUIREMENTS.........................................................................................................................13

3.5 INSTALLATION KITS CONTENTS...............................................................................................................13

3.6 SUGGESTED TOOL REQUIREMENTS.......................................................................................................14

4.

TROUBLESHOOTING GUIDE

4.1 OUTSIDE DIMENSIONS...............................................................................................................................15

4.2 PIPING SYSTEM...........................................................................................................................................15

4.3 TROUBLESHOOTING GUIDE......................................................................................................................16

5. SCHEMATIC DIAGRAM

5.1 CIRCUIT DIAGRAM......................................................................................................................................25

5.2 ELECTRONIC CONTROL DEVICE ..............................................................................................................26

5.3

COMPONENTS LOCATION(FOR MAIN P.C.B ASM

).......................................................................................................27

5.4

COMPONENTS LOCATION(FOR DISPLAY P.C.B ASM)

.......................................................................................................27

6. EXPLODED VIEW..................................................................................................................................28

7. REPLACEMENT PARTS LIST........................................................................................................29

CONTENTS

—3—

1.1 SAFETY PRECAUTIONS

1. When servicing, set the POWER of CONTROL
BOARD to Off and unplug the power 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.

3. After servicing, make an insulation resistance test to
prevent the customer's exposure 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 or green and
yellow) is to be open.

3. Measure the resistance value with an ohm meter
between the jumpered lead and each exposed
metallic part on the equipment at all Mode [except
POWER OFF].

4. The value should be over 1 MΩ.

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.

1.3 SPECIFICATIONS

POWER SUPPLY 1Ø, 208-230V, 60Hz
COOLING CAPACITY (Btu/h) 14,800
INPUT (W) 1,410
RUNNING CURRENT (A) 6.5
REFRIGERANT CHARGE (g) 690(24.3 OZ)

INDOOR (°C) 26.7(DB) 19.4(WB)

OUTDOOR (°C) 35(DB) 23.9(WB)
FAN, INDOOR BLOWER
FAN, OUTDOOR PROPELLER TYPE FAN WITH SLINGER-RING
FAN SPEEDS, FAN/COOLING 3/3
FAN MOTOR 6 POLES
OPERATION CONTROL TOUCH PANEL
ROOM TEMP. CONTROL THERMISTOR

VERTICAL LOUVER(RIGHT & LEFT)

HORIZONTAL LOUVER(UP & DOWN)

CONSTRUCTION SLIDE IN-OUT CHASSIS

COMPRESSORINTERNAL OVERLOAD PROTECTOR

FAN MOTORINTERNAL THERMAL PROTECTOR

1.6m (3 WIRE WITH GROUNDING)

ATTACHMENT PLUG(CORD-CONNECTED TYPE)
DRAIN SYSTEM DRAIN PIPE OR SPLASHED BY FAN SLINGER
NET WEIGHT (lbs/kg) 110/50
OUTSIDE DIMENSION (inch) 26 x 16

27

/32 x26

9

/16

(WxHxD) (mm) 660x428x675

LWM1430TAS/LW-136

MODELS

ITEMS

AIR DIRECTION CONTROL

PROTECTOR

POWER CORD

OPERATING
TEMPERATURE

* DB:Dry Bulb

**

WB:Wet Bulb

NOTE : Specifications are subject to minor change without notice for further improvement.

1.4 FEATURES

• Designed for cooling only.

• Powerful and quiet cooling.

• Slide-in and slide-out chassis for the simple installation
and service.

• Reversible inlet grille.

1.5 CONTROL LOCATIONS

• VENTILATION

The ventilation lever must be in the CLOSE position in
order to maintain the best cooling conditions.
When a fresh air is necessary in the room, set the
ventilation lever to the OPEN position.
The damper is opened and room air is exhausted.

NOTE: Before using the ventilation feature, make

the lever, as shown. First, pull down part
to horizontal line with part .

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

Operation starts, when this button is pressed and stops
when you press the button again.

OPERATION MODE SELECTION BUTTON

Select Cooling, or Fan or Dehumidification(Dry) mode
with button. (Dry mode is not to all models.)

ON/OFF TIMER BUTTON

Set the time of starting and stopping operation. The
timer is set by 1 hour.

FAN SPEED SELECTOR

Select the fan speed in three steps.

-High[F3] ➔ Low[F1] ➔ Med[F2]➔ High[F3]... .

ROOM TEMPERATURE SETTING BUTTON

Control the room temperature within a range of 60°F to
86°F by 1°F.

AUTO SWING

Control the horizontal air direction by air swing system.

• Side air-intake, side cooled-air discharge.

• Built in adjustable THERMISTOR.

• Washable one-touch filter.

• Compact size.

—4—

Part A

Part B

VENTCLOSE OPEN

2

3

1

4

7

5

1

4
2

3
6

3

5

1

4
2
6

5

6

6

—5—

2.1 MECHANICAL PARTS

2.1.1 FRONT GRILLE

1. Open the inlet grille upward or downward.

2. Remove the screw which fastens the front grille.

3. Pull the front grille from the right side.

4. Remove the front grille. (See Fig. 1)

5. Re-install the component by referring to the
removal procedure.

NOTE: Mark ∆ of inlet grille means opening direction.

2.1.2 CABINET

1. After disassembling the FRONT GRILLE, remove
the screws which fasten the cabinet at both sides.
Keep these for later use.

2. Remove the two screws which fasten the cabinet
at back. (See Fig. 2)

3. Pull the base pan forward.

2.1.3 CONTROL BOX

1. Remove the front grille. (Refer to section 2.1.1)

2. Pull the base pan forward so that you can remove
the 2 screws which fasten the cover control at the
right side. (See Fig. 3)

3. Remove the 3 screws which fasten the control
box. (See Fig. 3)

4. Discharge the capacitor by placing a 20,000 ohm
resistor across the capacitor terminals.

5. Disconnect two wire housings in the control box.

6. Pull the control box forward completely.

7. Re-install the components by referring to the
removal procedure. (See Fig. 3)
(Refer to the circuit diagram found on page 24 in
this manual and on the control box.)

2. DISASSEMBLY INSTRUCTIONS

— Before the following disassembly, POWER SWITCH is set to OFF and disconnected the power cord.

Figure 1

Figure 2

Figure 3

—6—

2.2 AIR HANDLING PARTS

2.2.1 COVER (AT THE TOP)

1. Remove the front grille. (Refer to section 2.1.1)

2. Remove the cabinet. (Refer to section 2.1.2)

3. Remove 11 screws which fasten the brace and
covers.

4. Remove the covers and the brace. (See Fig. 4)

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

2.2.2 BLOWER

1. Remove the cover. (Refer to section 2.2.1)

2. Remove the 3 screws which fasten the
evaporator at the left side and the top side.
(See Fig. 4)

3. Move the evaporator sideward carefully.

4. Remove the orifice from the air guide carefully.

5. Remove the clamp spring which is clamped to the
boss of blower by hand plier. (See Fig. 5)

6. Pull the blower outward, without touching blades.
(See Fig. 6)

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

2.2.3 FAN

1. Remove the cabinet. (Refer to section 2.1.2)

2. Remove the brace and shroud cover.
(Refer to section 2.2.1)

3. Remove the 5 screws which fasten the condenser.

4. Move the condenser sideways carefully.

5. Remove the clamp which secures the fan.

6. Remove the fan. (See Fig. 7)

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

Figure 4

Figure 5

Figure 6

Figure 7 (a) Figure 7 (b)

—7—

2.2.4 SHROUD

1. Remove the fan. (Refer to section 2.2.3)

2. Remove the 2 screws which fasten the shroud.

3. Remove the shroud. (See Fig. 8)

4. Re-install the component by referring to the
removal procedure, above.

2.3 ELECTRICAL PARTS

2.3.1 MOTOR

1. Remove the cabinet. (Refer to section 2.1.2)

2. Remove the cover control and disconnect a wire
housing in control box. (Refer to section 2.1.3)

3. Remove the blower. (Refer to section 2.2.2)

4. Remove the fan. (Refer to section 2.2.3)

5. Remove the 4 screws which fasten the motor.
(See Fig. 9)

6. Remove the motor.

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

2.3.2 COMPRESSOR

1. Remove the cabinet. (Refer to section 2.1.2)

2. Discharge the refrigerant by using a Refrigerant
Recovery System.

3. Disconnect the 3 leads from the compressor.

4. After purging the unit completely, unbraze the
suction and discharge tubes at the compressor
connections.

5. Remove the 3 nuts and the 3 washers which
fasten the compressor. (See Fig. 10)

6. Remove the compressor.

7. Re-instill the components by referring to the
removal procedure, above.

2.3.3 CAPACITOR

1. Remove the control box. (Refer to section 2.1.3)

2. Remove the screw which fasten the display panel.

3. Disconnect the 2 leads from the rocker switch and
remove the panel.

4. Remove a screw and unfold the control box.
(See Fig. 11)

5. Remove the screw and the clamp which fastens
the capacitor. (See Fig. 11)

6. Disconnect all the leads of capacitor terminals.

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

Figure 8 (a) Figure 8 (b)

Figure 9

Figure 10

Figure 11

—8—

2.3.4 POWER CORD

1. Remove the control box. (Refer to section 2.1.3)

2. Unfold the control box. (Refer to section 2.3.3)

3. Disconnect the grounding screw from the control
box.

4. Disconnect 2 receptacles.

5. Remove a screw which fastens the clip cord.

6. Pull the power cord. (See Fig. 12)

7. Re-install the component by referring to the
removal procedure, above.
(Use only one ground-marked hole for ground
connection.)

8. If the supply cord of this appliance is damaged, it
must be replaced by the special cord.
(The special cord means the cord which has the
same specification marked on the supply cord
fitted to the unit.)

2.3.5 THERMISTOR

1. Remove the control box. (Refer to section 2.1.3)

2. Unfold the control box. (Refer to section 2.3.3)

3. Disconnect the thermistor terminals from main
P.W.B assembly.

4. Remove the thermistor.

5. Re-install the components by referring to the
removal procedure above. (See Figure 13)

2.3.6 SYNCHRONOUS MOTOR

1. Remove the control box. (Refer to section 2.1.3)

2. Unfold the control box. (Refer to section 2.3.3)

3. Remove the crankshaft.

4. Disconnect all the leads of the synchronous
motor.

5. Remove the 2 screws which fasten the
synchronous motor. (See Fig. 14)

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

Figure 13

Figure 12

Figure 14

—9—

2.4 REFRIGERATION CYCLE

2.4.1 CONDENSER

1. Remove the cabinet. (Refer to section 2.1.2)

2. Remove the brace and the shroud cover.
(Refer to section 2.2.1)

3. Remove the 5 screws which fasten the condenser.

4. After discharging the refrigerant completely,
unbraze the interconnecting tube at the condenser
connections.

5. Remove the condenser.

6. Re-install the components by referring to notes.
(See Fig. 15)

2.4.2 EVAPORATOR

1. Remove the cabinet. (Refer to section 2.1.2)

2. Remove the top cover and the brace.
(Refer to section 2.2.1)

3. Discharge the refrigerant completely.

4. Remove the 3 screws which fasten the evaporator
at the left side and the top side.

5. Move the evaporator sideward carefully and then
unbraze the interconnecting tube at the evaporator
connectors.

6. Remove the evaporator.

7. Re-install the components by referring to notes.
(See Fig. 16)

2.4.3 CAPILLARY TUBE

1. Remove the cabinet. (Refer to section 2.1.2)

2. Remove the brace. (Refer to section 2.2.1)

3. After discharging the refrigerant completely,
unbraze the interconnecting tube at the capillary
tube.

4. Remove the capillary tube.

5. Re-install the components by referring to notes.

Figure 15 (a)

Figure 15 (b)

Figure 16

Discharge the refrigerant system using Freon

TM

Recovery System.
If there is no valve to attach the recovery system,
install one (such as a WATCO A-1) before
venting the Freon

TM

. Leave the valve in place

after servicing the system.

CAUTION

—10—

— Replacement of the refrigeration cycle.

1. When replacing the refrigeration cycle, be sure to
discharge the refrigerant system using a Freon

TM

recovery System.
If there is no valve to attach the recovery system,
install one (such as a WATCO A-1) before venting
the FreonTM. Leave the valve in place after
servicing the system.

2. After discharging the unit completely, remove the
desired component, and unbrace the pinch-off
tubes.

3. Solder service valves into the pinch-off tube ports,
leaving the valves open.

4. Solder the pinch-off tubes with Service valves.

5. Evacuate as follows.

1) Connect the vacuum pump, as illustrated Fig.

17A.

2) Start the vacuum pump, slowly open manifold

valves A and B with two full turns
counterclockwise and leave the valves closed.
The vacuum pump is now pulling through valves
A and B up to valve C by means of the manifold

and entire system.

3) Operate the vacuum pump for 20 to 30 minutes,

until 600 microns of vacuum is obtained. Close
valves A and B, and observe vacuum gauge for
a few minutes. A rise in pressure would
indicate a possible leak or moisture remaining in
the system. With valves A and B closed, stop

the vacuum pump.

4) Remove the hose from the vacuum pump and

place it on the charging cylinder. See Fig. 17B.
Open valve C.
Discharge the line at the manifold connection.

5) The system is now ready for final charging.

6. Recharge as follows :

1) Refrigeration cycle systems are charged from the
High-side. If the total charge cannot be put
in the High-side, the balance will be put in the
suction line through the access valve which you
installed as the system was opened.

2)

Connect the charging cylinder as shown in Fig. 17B.
With valve C open, discharge the hose at the
manifold connection.

3)Open valve A and allow the proper charge to
enter the system. Valve B is still closed.

4) If more charge is required, the high-side will not
take it. Close valve A.

5) With the unit running, open valve B and add the
balance of the charge.

a.Do not add the liquid refrigerant to the Low-

side.

b. Watch the Low-side gauge; allow pressure to

rise to 30 lbs.
c. Turn off valve B and allow pressure to drop.
d. Repeat steps B and C until the balance of the

charge is in the system.

6)When satisfied the unit is operating correctly,
use the pinch-off tool with the unit still running
and clamp on to the pinch-off tube. Using a tube
cutter, cut the pinch-off tube about 2 inches from
the pinch-off tool. Use sil-fos solder and solder
pinch-off tube closed. Turn off the unit, allow it to
set for a while, and then test the leakage of the
pinch-off connection.

NOTES

If high vacuum equipment is used, just crack
valves A and B for a few minutes, then open
slowly with the two full turns counterclockwise.
This will keep oil from foaming and being
drawn into the vacuum pump.

CAUTION

—11—

Equipment needed: Vacuum pump, Charging cylinder, Manifold gauge, Brazing equipment. Pinch-off tool
capable of making a vapor-proof seal, Leak detector, Tubing cutter, Hand Tools to remove components, Service
valve.

A

COMPOUND GAUGE

EVAPORATOR
(LOW PRESSURE SIDE)

COMPRESSOR

CAPILLARY TUBE

CONDENSER
(HIGH PRESSURE SIDE)

SEE INSETS

BELOW

MANIFOLD

GAUGE

B

Figure 17A-Pulling Vacuum

Figure 17B-Charging

A

B

EXTERNAL
VACUUM PUMP

LOW

B

HI

A

CHARGING
CYLINDER

C

—12—

3. INSTALLATION

3.1 HOW TO INSTALL THE UNIT

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.

3.2. HOW TO DRAIN

(When using drain pipe)

The air conditioner must be installed horizontally or
tilted slightly to the outside for proper water drainage.

On exceptionally hot and humid days the air
conditioner may overflow condensed water.

If the air conditioner is used in a hot and high
humidity zone, exchange the HOLE RUBBER for
the DRAIN PIPE.(See figure 17, figure 18.)
Press the drain pipe into the hole by pushing down
and away from the fins to avoid injury

3.3 HOW TO USE THE REVERSIBLE

INLET GRILLE

The grille is designed to clean the filter both upward and downward.

A. BEFORE ATTACHING THE FRONT GRILLE TO THE CABINET,

IF YOU WANT TO PULL OUT THE FILTER UPWARD;

1. Open the inlet grille slightly (a).

2. Turn inside out the front grille (a).

3.Disassemble the inlet grille from the front grille with

separating the hinged part by inserting a straight type
screw-driver tip (b).

4. Then, rotate the inlet grille 180 degrees and insert the hooks

into bottom holes of the front grille.

5. Insert the filter and attach the front grille to the cabinet.

B. IF YOU WANT TO PULL OUT THE FILTER DOWNWARD;

The grille is already designed for that way.

About 1/2"

Over 20"

HEAT

RADIATION

FENCE

AWNING

FOAM

COOLED

AIR

30-60"

Level

1/4 Bubble

(b)

b

(a)

(c)

BASE PAN

HOLE RUBBER

DRAIN PIPE

1

BOTTOM

2

BASE PAN

BOTTOM

hang push

—13—

3.4 WINDOW REQUIREMENTS

NOTE: All supporting parts should be secured to firm wood,

masonry, or metal.
The models of the specific area don't contain
installation feit.

3.4.1 WINDOW REQUIREMENTS

1. This unit is designed for installation in standard
double hung windows with actual opening widths from
29" to 41".
The top and bottom window sashes must open
sufficiently to allow a clear vertical opening of 18"
from the bottom of the upper sash to the window
stool.

2. The stool offset (height between the stool and sill)
must be less than 11/4".

3.5 INSTALLATION KITS CONTENTS

29" to 41"

18" min

Offset
Less

than 1

1

/4"

Sill

Exterior

Interior wall

26" min.

(Without frame curtain)

Stool

Angle Assembly(1) Supporter(4) Bracket(2) Type A(6)

Type B(4) Drain Joint Pipe(1) Carriage Bolt(4) Nut, Hexagon

—14—

3.5.1 PREPARATION OF CHASSIS

1. Remove the screws which fasten the cabinet at both sides
and at the back. Keep these two screws which fasten the
cabinet at both sides for later use.

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 Foam-PE with 3 holes and attach
it to the bottom of the Top retainer bar.

5. Attach the Top retainer bar onto the top of the cabinet with 3
screws (Type A).

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

7.Insert the Frame Curtain into the Top retainer bar and
Frame guides.

8. Fasten the curtains to the unit with 10 screws (Type A) at
both sides.

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

Figure 18

Figure 19

3.6 SUGGESTED TOOL REQUIREMENTS

Shipping screws

—15—

4. TROUBLESHOOTING GUIDE

4.1 OUTSIDE DIMENSIONS

675(770)

660

428

CAPILLARY TUBE

COMPRESSOR

BLOWER

EVAPORATOR COIL

CONDENSER COIL

FAN

MOTOR

: REFRIGERANT FLOW

4.2 PIPING SYSTEM

Following is a brief description of the important components and their functions in the refrigeration system.
Refer to Fig. 20 to follow the refrigeration cycle and the flow of the refrigerant in the cooling cycle.

MOTOR

COMPRESSOR

OIL

(LIQUID REFRIGERANT)

CAPILLARY TUBE

OUTSIDE COOLING
AIR FOR REFRIGERANT
PASS THROUGH

SUCTION LINE
COOL LOW PRESSURE VAPOR

COOLED
AIR

COMPLETE LIQUID
BOIL OFF POINT

LIQUID
PRESSURE
DROP

ROOM AIR HEAT LOAD

VAPOR INLET

HOT
DISCHARGED
AIR

LIQUID OUTLET

HIGH PRESSURE VAPOR
LIQUID PEFRIGERANT
LOW PRESSURE VAPOR

ROOM AIR CONDITIONER

EVAPORATOR COILS CONDENSER COILS

CYCLE OF REFRIGERATION

Figure 20

—16—

4.3 TROUBLESHOOTING GUIDE

In general, possible trouble is classified in two causes.
The one is called Starting Failure which is caused from an electrical defect, and the other is Ineffective Air
Conditioning caused by a defect in the refrigeration circuit and improper application.

Unit runs but poor cooling

Ineffective Cooling

Check of outdoor coil
(heat exchanger) & the fan
operation.

Check gas leakage.

Repair gas leak.

Replacement of unit if the
unit is beyond repair.

Satisfactory operation with
temperature difference of
inlet & outlet air ; 44.6~50°F

Check heat load increase.

Unexpected residue

Overloaded Circuit

Check of inside gas
pressure.

Adjusting of refrigerant
charge

Malfunction of compressor

Replacement of
compressor

Check of cold air circulation
for smooth flow.

Dirty indoor coil
(Heat exchanger)

Malfunction of fan

Clogged of air filter

Obstruction at air outlet

Correct above trouble

Stop of auto air-swing

Check clogging in
refrigeration circuit.

Repair clogging in
refrigeration circuit.

—17—

Fails to Start

Check of circuit breaker
and fuse.

Check of control panel.

Only fan fails to start.

Improper wiring.

Defect of fan motor
capacitor.

Irregular motor resistance
( ).
Irregular motor insulation
( ).

Replacement of fan motor

Regular but fails to start

Replacement of compressor
(locking of rotor, metal)

Improper thermistor setting

Loose terminal connection.

Improper wiring

Irregular motor resistance ( )

Irregular motor insulation ( )

Replacement of compressor
(Motor damaged)

Drop of power voltage.

Check capacitor.

Replacement.

Only compressor fails to
start.

Defect of compressor
capacitor.

Check of power source.

Check of control switch
setting.

Is the Trans output power the

same as specified?

Is the Trans output power

about AC 14V?

Is shorted the Trans. output?

Is output Voltage of IC01D

DC 12V?

Is output Voltage of IC02D

DC 5V?

Is the voltage No.18 of Micom

DC 5V?

Exchange Main P.W.B Ass'y.

Is the

connection between

Main and Display

all right?

Is the reset circuit all right?

(The No.14 of Micom

is 5V.)

•

Check the Fuse.

•

Check the wiring diagram.

•

Check the Main

P.W.B pattern.

• Exchange the Trans.

•

Exchange D02D~D05D.

• Exchange IC01D.

• Exchange IC02D.

• Exchange IC01A.

• Connect connector

exactly.

• Check the

P.W.B

pattern.

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

NO

YES

ELECTRIC PARTS TROUBLESHOOTING GUIDE:

Possible Trouble 1

• The unit does not operate.

—18—

—19—

Is Temp.

setting set lower than Room

Temp.-0.5°C?

Is the voltage No.10

of IC01M 0V?

• Exchange IC01M.

• Set the Temp. setting to higher Temp.

• Wait 3 Minutes

Is the Unit for 3 minutes

delay?

• Exchange MAIN
P.W.B Ass'y.

Is the voltage N0.7 of

IC01M DC 5V?

• Check the RY-COMP.

• Check the wiring

Diagram.

NO

NO

NO NO

YES

YES

YES

YES

Possible Trouble 2

• The compressor does not operate.

Is the wire connection of

RY-COMP all right?

• Check the RY-COMP.

• Connect LEAD Wire to

RY-COMP again.

NO

YES

Possible Trouble 3

• The compressor always operate.

• Exchange IC01M.

• Exchange IC01M.

Is the voltage NO.1 or 2 or 4

of IC01M DC 5V?

Is the voltage

NO.13 or 15 or 16

of IC01M 0V?

• Check the RY-Hi or
RY-Lo.

•

Check the wiring diagram.

NO

NO

YES

YES

Possible Trouble 4

• Fan does not operate.

—20—

Is the voltage of Battery

about over 2.3V?

•

Exchange Receiver Ass'y.

Is the connection of

CN-DISP1 all right?

Is the voltage No.16

of CN-DISP1 on Main P.W.B

Ass'y DC 5V?

• Exchange the battery.

•

Check the P.W.B pattern.

• Connect connector to
CN-DISP1 exactly.

NO

NO

NO

YES

YES

YES

NO

NO

YES

YES

Is the Knob of SW1

set to left position?

Is the voltage No.1 of

CN-DISP1 of Main PCB

Ass'y DC 5V?

• Reference to
OWNER'S MANUAL.

• Set the Knob of SW1
to left position.

• Check the SW1.

• Check the pattern of

Main & Display PCB.

Possible Trouble 6

• Romote controller does not operate.

Possible Trouble 5

• The function of Energy Saver does not operate.

—21—

NO

NO

NO

NO

YES

YES

YES

Is the IC01G all right?

Is the connection of
CN-DISP1 all right?

• Exchange the display
P.W.B Ass'y.

• Exchange IC01G.

• Exchange Q01G,

Q02G, Q03G, Q04G

• Connect connector
to CN-DISP1 exactly.

Does the Q01G,

Q02G, Q03G Q04G operate normally

on main P.W.B Ass'y?

Possible Trouble 7

• It displays abnormally on Display P.W.B Ass'y.

—22—

ROOM AIR CONDITIONER VOLTAGE LIMITS

NAME PLATE RATING MINIMUM MAXIMUM

AC 208-230V ±10% AC 187V AC 253V

COMPLAINT CAUSE REMEDY

Fan motor will not run. No power Check voltage at outlet. Correct if none.

Power supply cord Check voltage to rotary switch. If none, check

power supply cord. Replace cord if circuit is
open.

Rotary switch Check switch continuity. Refer to wiring diagram

for terminal identification. Replace switch if
defective.

Wire disconnected or Connect wire. Refer to wiring diagram for
connection loose terminal identification. Repair or replace loose

terminal.

Capacitor (Discharge Test capacitor.
capacitor before testing.) Replace if not within ±10% of manufacturer's

rating. Replace if shorted, open, or damaged.

Will not rotate Fan blade hitting shroud or blower wheel hitting

scroll. Re-align assembly.
Units using slinger ring condenser fans must

have 0.22~0.25 inch clearance to the base.
If necessary, shim up the bottom of the fan motor
with mounting screw(s).

Check fan motor bearings; if motor shaft will not
rotate, replace the motor.

Fan motor runs. Revolves on overload Check voltage. See limits on this page.

If not within limits, call an electrician.
Test capacitor.

Check bearings. Does the fan blade rotate

freely?

If not, replace fan motor.
Pay attention to any change from high speed to

low speed. If the speed does not change,
replace the motor.

—23—

COMPLAINT CAUSE REMEDY

Fan motor noise. Fan If cracked, out of balance, or partially missing,

replace it.

Blower If cracked, out of balance, or partially missing,

replace it.
Loose set screw Tighten it.
Worn bearings If knocking sounds continue when running or

loose, replace the motor. If the motor hums or

noise appears to be internal while running,

replace motor.

Compressor will not run, Voltage Check voltage. See the limits on the preceding
fan motor runs. page. If not within limits, call an electrician.

Wiring Check the wire connections; if loose, repair or

replace the terminal. If the wires are discon-

nected, refer to wiring diagram for identification,

and replace the wires. Check the wire connections;

If not according to the wiring diagram, correct

the connections.
Rotary Check for continuity, refer to the wiring diagram

for terminal identification. Replace the switch if

the circuit is open.
Thermistor Check the TEMP control. If not at the lowest

number, set TEMP control to this setting and

restart the unit.

Check the continuity of the thermistor. Replace

the thermistor if the circuit is open.

Capacitor (discharge Check the capacitor.
capacitor before Replace if not within ±10% of manufacturer’s
servicing.) rating, replace if shorted, open, or damaged.

Compressor Check the compressor for open circuit or

ground. If open or grounded, replace the

compressor.
Overload

Check the compressor overload if externally mounted.

Replace if open. (If the compressor temperature is

high, remove the overload, cool, and retest.)

Compressor cycles on Voltage Check the voltage. See the limits on the
overload. preceding page. If voltage is not within these limits,

call an electrician.
Overload Check overload, if externally mounted.

Replace if open. (If the compressor temperature

is high, remove the overload, cool, and retest.)

—24—

COMPLAINT CAUSE REMEDY

Compressor cycles on Fan motor If not running, determine the cause. Replace if
overload. required.

Condenser air flow Remove the cabinet, inspect the interior surface
restriction of the condenser. If restricted, clean carefully

with a vacuum cleaner (do not damage fins) or
brush. Clean the interior base before
re-assembling.

Condenser fins If the condenser fins are closed over a large
(damaged) area on the coil surface, head pressures will

increase, causing the compressor to cycle.

Straighten the fins or replace the coil.
Capacitor Test the capacitor.
Wiring Check the terminals. If loose, repair or replace.
Refrigeration system Check the system for a restriction.

Insufficient cooling Air filter If restricted, clean or replace.

Exhaust damper door Close if open.

Unit undersized Determine if the unit is properly sized for the

area to be cooled.

Excessive noise Blower or fan Check the set screw, or clamp. If loose or miss-

ing, correct. If the blower or fan is hitting scroll

or barrier, rearrange the air handling parts.
Copper tubing Remove the cabinet and carefully rearrange the

tubing not to contact the cabinet,

compressor, shroud, and barrier.

Auto air-swing fails. Wiring Check terminals. If loose, repair or replace.

Synchronous motor. Check the synchronous motor for open circuit.

—25—

NO.

1
2
3
4
5
6
7
8
9

DESCRIPTION

POWER CORD

FAN MOTOR

CAPACITOR

COMPRESSOR

MAIN PWB ASSEMBLY
DISPLAY PWB ASSEMBLY
THERMISTOR ASSEMBLY

CONNECTOR

FUSE

WH(BL)

POWER INPUT

BK(BR)

(Ribbed) (Plain)

GN/YL

(GN)

GN/YL(GN)

THERMISTOR

BK BK

BLRDBL

RD

CN-TH

YL YL

OR(BR) OR(BR)

OR(BR)

SYNC

MOTOR

RY-LO

RY-HI

CN-WORK

CN-SYNC CN-DISP

DISPLAY P.W.B ASM

RY-SYNC

250V/T2A
(115V/T2A)

TRANS

FORMER

ZNR

RY-COMP

MAIN P.W.B ASM

BK

BK

BR
BR

ION

H.V.B

RD
BL BL

OLP

RD

MOTOR

CAPACITOR

F

R

S

COMP.

C

C

H

3854AR2330R
WIRING DIAGRAM

RY-MID

FUSE

RD

BK

PTC

43

GN/YL

(GN)

RD

1

7

6

8

5

9

2

3

4

1

7

6

8

5

9

2

3

4

WH(BL)

POWER INPUT

BK(BR)

(Ribbed) (Plain)

GN/YL

(GN)

GN/YL(GN)

THERMISTOR

BK BK
BLRDBL

RD

CN-TH1

YL YL

OR(BR) OR(BR)

OR(BR)

SYNC

MOTOR

RY-LO

RY-HI

CN-WORK

CN-SYNC CN-DISP

DISPLAY P.W.B ASM

RY-SYNC

250V/T2A
(115V/T2A)

TRANS

FORMER

ZNR

RY-COMP

MAIN P.W.B ASM

BK

BK

BR
BR

RD

BL BL

OLP

RD

MOTOR

CAPACITOR

F

R

S

COMP.

C

C

H

3854AR2330P
WIRING DIAGRAM

RY-MID

FUSE

RD

BK

PTC

43

5. SCHEMATIC DIAGRAM

5.1 CIRCUIT DIAGRAM

LW-136 LWM1430TAS

—26—

NOTE

1. The unit of undefined resistors is

ohm, 1/6W, 5%.

2. The unit of undefined capacitors

is uF.

CN-DISP CN-DISP

Q04G

5V

3.6V

2

S7136

IC01A

1

A101S

Q01G

13

5

Q02G

A101S

Q03G

A101S

15

3

16

2

4

14

D06F

ON/OFF

SW6

SW8

AUTO SWING

D08F

SW4

D04F

MODE

SW5

D05F

TEMP DOWN

SW1

FAN

D01F

SW2

TIMER

D02F

A101S

5V

R03P

7

8

R02P

20K

20K

5

6

R04P

1K

SW7

TEMP UP

D07F

SW3

SAVER

ENERGY

5V

D03F

1

17

1

17

5V

5V

Digit0

aa

gg

e

cc

b

f

b

a

Digit1

b

5

4

COOL

d

3

2

e

f

e

1

7

TIMER

DRY/HEAT

FAN

c

f

DEFROST

dd

C22L

220

5V

10V

8

Vcc

Vout

PKM13EPY

-4002

BZ01E

RECEIVER

GND

88 SEGMENT

+

E/SAVER

g

A/SWING

5

4

13

14

11

7

6

12

A/RESTART

10

9

8

9

8

7

10

11

R02G

R01G

152

161

R04G

220

R06G

R05G

134

116

125

143

R03G

220

220

220

220

220

6

3

15

12

2

16

12V

9

8

107

R07G

220

AIR PURIFIER

10

6

R01A

20K

3

10V

1uF

C02A

+

0.01

C01A

50V

OSC01B

1M

RT8.00MG

12.1K

1%

6.2K

1%

R01H

R02H

R01B

5V

CN-TH1

2

2

1

1

SMW250-02

CAT93C46

EEPROM

2

1

A0

A2

SCL

SDAGND

4

3

A1

5V

Rx

12

Tx

8

9

10

SDA

SCL

11

TEST

15 14 131719 18

VSS
VAref

16

Osc in
Osc out

/Reset

22 21 20

COMP

4WAY

LOW

SYNC

242526

23

Pipe TH
Option1
Option2

Room TH

567

123

SEG-c

SEG-a

SEG-b

4

MICOM

TMP87CH47U

SEG-d

44

SEG-e
SEG-f

434241

SEG-g

VDD

393837

KEY0

40

SLIDE SW

272829

ION

MED

HI

313233

Buzzer

30

Receiver

LED out3

363534

LED out0
LED out1
LED out2

KEY1

HVB

R22H

1%

1%

12.1K

0K

R03H

R21H

12.1K

5V

OR2H

710456

131211

RY-COMP

RY-4WAY

RY-LOW

RY-SYNC

OR1H

2
3

4

4

12V

128

16

15

9

IC01M

ULN2004A

RY-MED

RY-HI

12V

33

CN-SYNC

11

33

11

CN-4WAY

RY-4WAY

RY-SYNC

14

3

MOTOR

4WAY

S/V-

SYNC

PIPE-TH

ROOM-TH

0.001

C01F

10K

R01F

C02F

0.001

R02F

10K

R12F

20K

R02E

20

R01E

1K

5V

R01L

IC01G

ULN2004A

1K

680pF

C01L

I

+

7805

IC02D

O

C05D

220

+

I

O

7812

C02D

C03D

IC01D

12V

C04D

50V

50V

0.01

10V

1000

16V

50V

0.1

0.01

5V

C06D

RY-MED

RY-LOW

RY-HI

CN-RD

CN-BL

CN-BK

0.1/275V

C01J

CN-WOR

R01J

C01D

D04D

+

D05D

4

7

2

1

POWER TRANS

D02D

D03D

35V

1N4004

D02D~D05D

1000

RY-COMP

G4A-1A-E-LG

FUSE

250V/T2A

SVC271D-14A

ZNR01J

120 1/2W

FAN

MOTOR

CAPACITOR

C

FAN

HERM

COMP

MAIN POWER

Digit0 (Scan0)

Digit2 (Scan2)

Digit1 (Scan1)

Digit4 (Scan4)

Digit3 (Scan3)

Vcc

WP

5.2. ELECTOINC CONTROL DEVICE

—27—

5.3. COMPONENTS LOCATION (FOR MAIN P.C.B ASM)

LWM1430TAS LW-136

5.4. COMPONENTS LOCATION (FOR DISPLAY P.C.B ASM)

—28—

6. EXPLODED VIEW

152302
135313
135303

147581-1

147581-2

135312

552102

554030

148000

352390

349600

346811

130410

354210

147582

349001

359012

349480

W48602

W48602

559010

731273

267110

149980

550140

554160

567502

352115

352113

35211A

352111

263230

268712

146812

264110

268714

237200

238310

W0CZZ

249950

135510

130910

W52106-2

W52106-1

—29—

7. REPLACEMENT PARTS LIST

130410 BASE ASSEMBLY, SINGLE 3041A30002B 3041A30002B R
130910 CABINET ASSEMBLY, SINGLE 3091AR6057B 3091AR6057B R
135312 GRILLE ASSEMBLY, FRONT(SINGLE) 3531A20073C 3531A20073C R
135313 GRILLE, INLET 3530A10070A 3530A10070A R
135500 COVER, TERMINAL 3550U-L004A 3550U-L004A R
135510 COVER ASSEMBLY, CONTROL(SINGLE) 3551A30015A 3551A30015A R

146812 MOTOR ASSEMBLY, SYNC. 2H01102A 2H01102A R
147581-1 LOUVER, HORIZONTAL 4758AR7264A 4758AR7264A R
147581-2 LOUVER, HORIZONTAL 4758AR7278A 4758AR7278A R

148000 BRACE 4800AR7272A 4800AR7272A R

149980 SHROUD 4998AR1597A 4998AR1597A R

152302 FILTER ASSY, A/C 5231AR6159A 5231AR6159A R

237200 PANEL, CONTROL 3720AR6163A 3720AR6163B R

238310 ESCUTCHEON 3831A20060A 3831A20032Z R

249950 CONTROL BOX ASSEMBLY, SINGLE 4995A20254J 4995A20045S R

263230 THERMISTOR ASSEMBLY 6323A20003D 6323A20003D R

264110 POWER CORD ASSEMBLY 6410A20007B 3H03671A R

267110 REMOTE CONTROLLER ASSEMBLY 6711A20052G 6711A20052B R

268712 PWB(PCB) ASSEMBLY, DISPLAY 6871A20195C 6871A20195B R

268714 PWB(PCB) ASSEMBLY, MAIN(AC) 6871A20188A 6871A20196E R

346811 MOTOR ASSEMBLY, SINGLE 4681AR6033K 4681AR6033K R

349001 DAMPER, VENTILATION 4900AR7265A 4900AR7265A R

349480 ORIFICE 4948A30006A 4948A30006A R

349600 MOUNT, MOTOR 4960AR1596A 4960AR1596A R

352111 TUBE ASSEMBLY, CONNECTOR 5211AR7059A 5211AR7059A R

352113 TUBE ASSEMBLY, DISCHARGE SINGLE 5211A30066S 5211A30066S R

35211A TUBE ASSEMBLY, SUCTION SINGLE 5211A30088G 5211A30088G R
352390 AIR GUIDE ASSEMBLY 5239A20001J 5239A20001J R
354210 EVAPORATOR ASSEMBLY, FIRST 5421A20009E 5421A20009E R
359012 FAN ASSEMBLY, BLOWER 5834AR1599A 5834AR1599A R
550140 ISOLATOR, COMP 4H00982C 4H00982C R
552101 TUBE, CAPILLARY 5424AR3411X 5424AR3411X R
554031 CONDENSER ASSEMBLY, BENT 5403A20004K 5403A20004K R
554160 COMPRESSOR SET 2520UKRK2BA 2520UKRK2BA R
559010 FAN ASSEMBLY, AXIAL 5900AR1508A 5900AR1508A R
731273 INSTALL PART ASSEMBLY, SET 3127AR3523F 3127AR3523F R
W0CZZ CAPACITOR, DRAWING 6120AR2194D 6120AR2194D R

W48602 CLAMP, SPRING 3H02932C 3H02932C R

PART NO.

DESCRIPTION

REMARK

LOCATION

NO.

LW-136 LWM1430TAS

R: Service Parts

NOTE)*Please ensure GCSC since these parts may be changed depending upon the buyer's request.

(GCSC WEBSITE http://biz.LGservice.com)

P/No.: 3828A20095T

August, 2003

Printed in Korea