LG TWC051HGAA2.AWYBLAT (W051CA) User manual

LG Room
Air Conditioner
SERVICE MANUAL
LG
MODEL: TWC051HGAA2.AWYBLAT (W051CA)
TWC052HGAA0.AWYBLCP (LA050MG)
TWC061HGAA2.AWYBLAT (W061CA)
TWC062HGAA0.AWYBLCP (LA060MG1)
CAUTION
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.
website http://www.lgservice.com

2Room 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
Howto Install..............................................................................................................................................7
Operation ........................................................................................................................................................8
Features.....................................................................................................................................................8
Insulation Resistance Test..........................................................................................................................8
About the Controls on the Air conditioner ..................................................................................................8
Disassembly....................................................................................................................................................9
Mechanical Parts........................................................................................................................................9
Air Handling Parts ....................................................................................................................................10
Electrical Parts.........................................................................................................................................11
Refrigerating Cycle...................................................................................................................................12
Schematic Diagram.......................................................................................................................................15
Wiring Diagram.........................................................................................................................................15
Troubleshooting Guide.................................................................................................................................16
Piping System ..........................................................................................................................................16
Troubleshooting Guide .............................................................................................................................17
Room Air Conditioner Voltage Limits........................................................................................................19
Exploded View..............................................................................................................................................22
Replacement Parts List ................................................................................................................................23

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.
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.
Be sure not to do.
Be sure to follow the instruction.

4Room Air Conditioner
Safety Precautions
Do not modify or extend the power cord.
•Thereisriskorfireorelectricshock.
Do not install, remove, or re-install the unit by
yourself.
• 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 com-
bustibles near the air conditioner.
• There is risk of fire or failure of product.
Be sure the installation area does not deterio-
rate with age.
• If the base collapses, the air conditioner could fall with
it, causing property damage, product failure, and per-
sonal injury.
Gasolin
Sharp edges

Dimensions
Dimensions
H
DW
Operation
High
Fan
Low
Fan
High
Cool
Off
Low
Cool
Thermostat
1
2
3
456
7
8
9
W mm(inch) 472(18 9/16")
H mm(inch) 312(12 1/4")
D mm(inch) 370(14 9/16")
Model
Dimension
All Model
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
Service Manual 5

W051CA W061CA LA050MG LA060MG1
5050 Btu/h 6000 Btu/h 5500KJ/H 6000KJ/H
520 620 520 555
4.8 5.8 2.4 2.5
9.7BTU/W.h 9.7BTU/W.h 10.6KJ/H-W 10.8KJ/H-W
OPERATING
CONDITION
220 270
Ø5 2R 10C SLIT-FIN
Ø7 1R 14C, LOUVERED-FI
N
* DB:Dry Bulb
**WB:Wet Bulb
1. SPECIFICATIONS
(3 WIRE WITH GROUDING)
ATTACHMENT PLUG (CORD-CONNECTED TYPE)
DRAIN PIPE OR SPLASHED BY FAN SLINGER
TOP DOWN CHASSIS
2WAY (RIGHT & LEFT)
OVERLOAD PROTECTOR(Internal)
INTERNAL THERMAL PROTECTOR
COMPRESSOR
FAN MOTOR
CONSTRUCTION
AIR DIRECTION CONTROL
DRAIN SYSTEM
PROTECTOR
POWER CORD
OPERATION CONTROL
ROOM TEMP. CONTROL
FAN MOTOR
FAN, OUTDOOR
FAN SPEEDS, FAN/COOLING
FAN, INDOOR
CONDENSER
EVAPORATOR
REFRIGERANT (R-22) CHARGE
INDOOR (°C)
OUTDOOR (°C)
E.E.R (BTU/W.h)
RUNNING CURRENT (A)
INPUT (W)
COOLING CAPACITY
POWER SUPPLY
. MODELS
. .
ITEMS
1ø, 115V~, 60Hz 1ø, 230V~, 60Hz
27(DB)* 19(WB)**
TURBO FAN
Ø7 2R 10C SLIT-FIN
Ø5 2R 14C, LOUVERED-FIN
35(DB)* 24(WB)** 35(DB)* 27(WB)**
PROPELLER TYPE FAN WITH SLINGER-RING
4 POLES
2/2
250
ROTARY SWITCH
THERMOSTAT
SPECIFICATIONS ARE SUBJECT TO MINOR CHANGE WITHOUT NOTICE FOR FURTHER
IMPROVEMENT.
NOTICE
6Room Air Conditioner
Product Specifications
Product Specifications

Window Requirements
All supporting parts should be secured to firm
wood, masonry, or metal.
1. This unit is designed for installation in standard double
hung windows with actual opening widths of 22" to 36".
The upper and lower sash must open sufficiently to allow
a clear vertical opening of 13" from the bottom of the
sash to the window stool.
2. If storm window presents interference, fasten a 2" wide
wood strip to the inner window sill across the full width of
the sill. The wood strip should be thick enough to raise
the height of the window sill so that the unit can be
installed without interference by the storm window frame.
See Figure. 3. Top of wood strip should be approximately
3/4" higher than the storm window frame (STORM WIN-
DOW FRAME) or wood strip (OUTDOORS) to help con-
densation to drain properly to the outside.
3. Install a second wood strip (approximately 6" long by
11/2" wide and same thickness as first strip) in the center
of the outer sill flush against the back off the inner sill.
This will raise the L bracket as shown Figure. 3.
4. If the distance between STORM WINDOW FRAME and
WOOD STRIP MOUNTED ON TOP OF INNER SILL is
more than 1", two of wood strip are not necessary.
NOTICE
Installation
Installation
Select the Best Location
How to Install
This air conditioner is designed with a button-down chassis so it can be easily installed in a window.
1. To prevent vibration and noise, make sure the unit is
installed securely and firmly.
2. Install the unit where the sun does not shine directly on
the unit.
3. The outside of the cabinet must extend outward for at
least 10" 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 on the outdside of
the structure.
4. Install the unit slanted slightly so the back is slightly
lower than the front (about 1/4"). This will force con-
densed water to the outside.
5. Install the unit with the bottom about 30"~60" above the
floor level.
ABOUT / "
Over 20"
HEAT
RADIATION
FENCE
AWNING
OUTSIDE
INSIDE
OOLED AIR
30"-60"
14
OUTDOORSINDOORS
INNER SILL
OUTER
SILL
INNER
SILL
WOOD STRIP MOUNTED
ON TOP OF INNER SILL
WOOD STRIP
FOR
L BRACKET
3/4"
CLEARANCE
1" MAX.
STORM
WINDOW
FRAME
OUTDOORSINDOORS
OUTER
SILL
Figure 1
Figure 2
Figure 3
Service Manual 7

Operation
Feature
Insulation Resistance Test
About the jControls or the Air Conditioner
•DESIGNED FOR COOLING ONLY
•POWERFUL AND INCREDIBLE COOLING
•TOP-DOWN CHASSIS FOR THE SIMPLE INSTALLATION AND SERVICE
•BUILT-IN ADJUSTABLE THERMOSTAT
•WASHABLE ONE-TOUCH FILTER
•COMPACT SIZE
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 positions [except Off] of the ROTARY SWITCH.
4. The value should be over 1 MΩ.
Operation
Operation
High
Fan
Low
Fan
High
Cool
Off
Low
Cool
Thermostat
1
2
3
456
7
8
9
Off - Turns air conditioner off.
High Fan - High speed fan operation without cooling.
Low Fan - Low speed fan operation without cooling.
High Cool - Cooling with high speed fan operation.
Low Cool - Cooling with low speed fan operation.
FAN ONLY- Fan operation without cooling.
TURBO COOL - Cooling with high speed fan operation.
This automatically controls the temperature of the
indoor air.
Turn the knob so that arrow points to the larger marks
for greater cooling.
Point the arrow to the smaller marks for more moder-
ate cooling.
(i.e. the higher number, the greater cooling)
8Room Air Conditioner

1. FRONT GRILLE
1. Disconnect the unit from source of power.
2. Remove the two knobs by pulling them off.
Using a screwdriver, remove the screw that secures the
front grille to control board. (See Figure 13)
3. Push the front grille up from the bottom.
Pull the top of the front grille away from the cabinet as the
top tabs lift out of their slots. (See Figure 14)
4. Replace the grille by placing the tabs in the slots and
push the grille until it snaps into place.
2. CABINET
1. Disconnect the unit from the power source.
2. Remove the front grille. (Refer to section 1)
3. Remove 9 screws that secure the cabinet to the base pan
and condenser. (See Figure 15)
4. Lift the cabinet from the unit.
5. Re-install by referring to the procedures above.
3. CONTROL BOARD
1. Disconnect the unit from the power source.
2. Remove the front grille. (Refer to Section 1)
3. Remove the cabinet. (Refer to Section 2)
4. Remove 2 screws that secure the control board to base
pan and air guide. (See Figure 16)
5. Pull the control board toward yourself.
Controls, wires, and capacitor are now accessi-
ble for servicing. Discharge the capacitor before
servicing. See step 2.3.3 on page 8 for proce-
dures.
6. Disconnect one housing terminal and 3 wires for the fan
motor and compressor. (See Figure 17)
7. Re-install components by referring to procedures above.
(Refer to wiring diagram on page 17 in this manual or
inside control board.)
NOTICE
Disassembly
Mechanical Parts
Disassembly
Figure 13
Figure 14
Figure 15
Figure 16
Figure 17
Service Manual 9

4. AIR GUIDE UPPER
1. Disconnect the unit from the power source.
2. Remove the front grille. (Refer to Section 1)
3. Remove the cabinet. (Refer to Section 2)
4. Remove the control board. (Refer to Section 3)
5. Remove 2 screws that secure the brace to air
guide upper and shroud. (See Figure 18)
6. Remove 2 screws that secure the air guide
upper to air guide lower. (See Figure 8)
7. Lift air guide upper upward.
8. Re-install by referring to the procedures above.
5. ORIFICE, TURBO FAN AND FAN
1. Disconnect the unit from the power source.
2. Remove the front grille. (Refer to Section )
3. Remove the cabinet. (Refer to Section 2)
4. Remove the control board. (Refer to Section 3)
5. Remove the air guide upper. (Refer to Section 24)
6. Remove 2 screws that secure the base pan to con-
denser. (See Figure 19)
7. Remove 2 screws that secures the shroud to
channel of condenser.
8. Press the snap area of shroud with your thumbs.
This allows you to remove it from the condenser.
9. Lift the compressor upward with the evaporator and
condenser. (See Figure 19)
10. Remove the orifice by pushing the snap area of the air
guide blower. (See Figure 20)
11. Remove the clamp springs which are clamped to the
boss of fan and turbo fan by hand plier.
(See Figure 21)
12. Pull the fan and turbo fan outward.
13. Remove the shroud.
14. Re-install by referring to the procedures above.
Disassembly
Air Handling Parts
Figure 19
Figure 18
Figure 20
Figure 21
10 Room Air Conditioner