1.1 FEATURES ........................................................................................................................................................................ 2
2.1 MECHANICAL PARTS ...................................................................................................................................................... 6
2.1.1 FRONT GRILLE ....................................................................................................................................................... 6
2.1.3 CONTROL BOARD ................................................................................................................................................... 6
2.2 AIR HANDLING PARTS .................................................................................................................................................... 7
2.2.1 AIR GUIDE UPPER................................................................................................................................................... 7
2.2.2 ORIFICE, TURBO FAN AND FAN............................................................................................................................. 7
2.2.3 MOTOR .................................................................................................................................................................... 8
2.2.4 AIR GUIDE ................................................................................................................................................................ 8
2.3 ELECTRICAL PARTS ....................................................................................................................................................... 8
2.3.5 CONTROL PANEL..................................................................................................................................................... 9
2.3.6 POWER CORD ...................................................................................................................................................... 10
3.1 SELECT THE BEST LOCATION ..................................................................................................................................... 13
3.2 HOW TO INSTALL .......................................................................................................................................................... 13
4.2 PIPING SYSTEM ............................................................................................................................................................ 17
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.
1.1 FEATURES
• DESIGNED FOR COOLING ONLY
• POWERFUL AND INCREDIBLE COOLING
• TOP-DOWN CHASSIS FOR THE SIMPLE INSTALLATION AND SERVICE
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.
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LGE Internal Use Only
Page 4
1.5 LOCATIONS OF CONTROLS
DryFan
Cool
ON/OFF TIMER
- STOPPING OPERATION
• Everytime you push this button, when the unit is operating,
timer is set as follows.
• Everytime you push this button, it will toggle between
COOL, FAN, DRY or FAN, COOL.
POWER
• To turn the unit ON, push the button. To turn the unit OFF,
push the button again.
• This button takes priority over any other buttons.
• When you first turn it on, the unit is on the High cool mode
and the temp. at 72°F(22°C).
TEMPERATURE SETTING
• This button can automatically control the temperature
of the room. The temperature can be set within a range of
60°F(16°C) to 86°F(30°C) by 1°F(1°C).
Select the lower number for lower temperature of the room.
FAN SPEED
• Everytime you push this button it is set as follows.
{High(F2)Low(F1)High(F2)...} or
{High(F3)Mid(F2)Low(F1)High(F3)...}.
ENERGY SAVER
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.
2. Using a screwdriver, remove the screw that
secures the front grille to control board.
(See Figure 1)
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 2)
4. Replace the grille by placing the tabs in the slots
and push the grille until it snaps into place.
2.1.2 CABINET
1. Disconnect the unit from the power source.
2. Remove the front grille. (Refer to section 2.1.1)
3. Remove 9 screws that secure the cabinet to the
base pan and condenser. (See Figure 3)
4. Lift the cabinet from the unit.
5. Re-install by referring to the procedures above.
Figure 1
Figure 2
Figure 3
2.1.3 CONTROL BOARD
1. Disconnect the unit from the power source.
2. Remove the front grille. (Refer to Section 2.1.1)
3. Remove the cabinet. (Refer to Section 2.1.2)
4. Remove 2 screws that secure the control board to
base pan and air guide. (See Figure 4)
5. Pull the control board toward yourself.
NOTE : Controls, wires, and capacitor are now
accessible for servicing. Discharge the
capacitor before servicing. See step
2.3.3 on page 9 for procedures.
6. Disconnect one housing terminal and 3 wires for
the fan motor and compressor. (See Figure 5)
7. Re-install components by referring to procedures
above. (Refer to circuit diagram on page 26 in this
manual or inside control board.)
2. Discharge the refrigerant by using a refrigerant
recovery system.
3. Remove the air guide upper. (Refer to Section
2.2.1)
4. After discharging the refrigerant completely,
unbraze the interconnecting tube of the capillary
tube.
5. Remove the capillary tube.
6. Re-install by referring to the procedures above.
NOTES
Replacement of the refrigeration cycle.
1. When replacing the refrigerating cycle, be sure to
discharge the refrigerant by using a refrigerant
recovery system.
2. After discharging the unit completely, remove the
desired components, and unbraze 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. After completing the above procedures, the valve
must be closed and left in place on the system for
any subsequent procedures.
6. Evacuate as follows:
6-1. Connect the vacuum pump, as illustrated in
figure 20A.
6-2. 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
manifold and the entire system.
6-4. Remove the hose from the vacuum pump and
place it on the charging cylinder. See figure
20B. Open valve C.
Discharge the line at the manifold connection.
6-5. The system is now ready for final charging.
7. Recharge as follows:
7-1. Rotary compressor 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 is
installed as the system is opened.
7-2. Connect the charging cylinder as shown in fig-
ure 20B. With valve C open, discharge the
hose at the manifold connection.
7-3. Open valve A and allow the proper charge to
enter the system. Valve B is still closed.
7-4. If more charge is required, the high-side will
not take it. Close valve A.
7-5. 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 the pressure to
drop.
d. Repeat steps B and C until the balance of
the charge is in the system.
7-6. When the unit is operating correctly, use the
pinch-off tool with the unit still running and the
clamp on 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
the pinch-off tube closed. Turn off the unit,
allow setting for a while and then test the leakage of the pinch-off connection.
CAUTION : If high vacuum equipment is used,
just crack valves A and B for a few minutes, then
open slowly with the two full turns counter-clockwise. This will keep oil from foaming and being
drawn into the vacuum pump.
6-3. Operate the vacuum pump for 20 to 30 min-
utes, until 600 micron 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.
This air conditioner is designed with a button-down
chassis so it can be easily installed in a window.
3.1 SELECT THE BEST LOCATION
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/
condensed water to the outside.
5. Install the unit with the bottom about 30"~60"
above the floor level.
4"). This will force
Figure 21
3.2 HOW TO INSTALL
3.2.1 WINDOW REQUIREMENTS
NOTE: 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. 23. Top of wood
strip should be approximately 3/4" higher than the
storm window frame (STORM WINDOW FRAME) or
wood strip (OUTDOORS) to help condensation to
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. 23.
and WOOD STRIP MOUNTED ON TOP OF INNER
SILL is more than 1", two of wood strip are not necessary.
- 13 -
Figure 22
Figure 23
LGE Internal Use Only
Page 14
Installation Kit (Some models)
HARDWARE
TYPE E: 1EA
(SASH SEAL)
(Not adhesive backed)
TYPE D: 1EA
(SEAL STRIP)
(Adhesive backed)
TYPE F: 2EA
(GUIDE PANEL)
TYPE C: 3EA
(L BACKET)
TYPE A: 11EA
(SHORT SCREW)
10mm
TYPE B: 5EA
(WOOD SCREW)
16mm
TYPE G: 1EA
(SUPPORT BACKET)
DRAIN PIPE
ROOM SIDE
CENTER LINE
INNER SILL
SEAL STRIP
(TYPE D)
TYPE A
TYPE C
OUTSIDE
INSIDE
L
BRACKET
OUTER SILL
INNER SILL
TYPE A
8"
8"
CENTER LINE
3.2.2 BEFORE INSTALLATION
1. Insert the guide panels into the guides of the air condi-
tioner. Fasten the curtains to the unit with screws (TYPE
A), as shown Figure. 24.
2.
Cut the adhesive-backed seal strip (TYPE D) to the window
width.
Remove the backing from the seal strip and attach the seal
strip to the underside of the bottom window. (
Figure
. 25)
3.2.3 NOW START INSTALLATION
1. LOCATING UNIT IN WINDOW
Open the window and mark center line on the center of
the inner sill, as shown in Figure. 26.
2. ATTACH L BRACKET
a. Install the L brackets behind the inner window sill, with
b. The bracket helps to hold unit securely in place. Be
During the following step, hold unit firmly until
window sash is lowered to top channel behind
side panel frames. Personal injury or property
damage may result if unit falls from window.
3. INSTALL THE AIR CONDITIONER IN THE WINDOW
a. Carefully lift the air conditioner and slide it into the
the short side of bracket as shown.
Use the 2 screws (TYPE A) provided.
sure to place bracket edge flush against back of inner
sill. See Figure. 27.
CAUTION
open window. Make sure the bottom guide of the air
conditioner drops into the notches of the
L bracket. See Figure. 27.
Figure 24
Figure 25
Figure 26
Figure 27
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Page 15
IMPORTANT :
CENTER LINE
SEAL
WINDOW FRAME
BOTTOM
GUIDE
ABOUT
1/4"
L
BRACKET
UPPER GUIDE
DRAIN PIPE
DRAIN CAP
hangpush
SASH SEAL
(TYPE E)
L BRACKET
TYPE A
TYPE B
Support Bracket (TYPE G)
12
When the air conditioner drops into the L bracket, the air
conditioner will be centered in window opening as shown in
Figure. 28.
b. While steadying the air conditioner, carefully bring the
window sash down behind the upper guide of the air
conditioner, as shown in Figure. 29.
4. SECURE THE GUIDE PANELS
Extend the guide panels (TYPE F) to fill the window
opening using 4 screws (TYPE B) to secure them, as
shown in Figure. 30.
5. INSTALL THE SASH SEAL AND SASH LOCK
a. Cut the sash seal (TYPE E) to the window width. Stuff
the sash seal between the glass and the window to
prevent air and insects from getting into the room, as
shown in Figure. 30.
b. Fasten the L bracket using a (TYPE A) screw, as
shown in Figure. 30.
Figure 28
Figure 29
TYPE B
Figure 30
6. a. Remove the screws that secure the cabinet and base
pan in the right side.
b. Fasten the suport bracket (TYPE G) using a removed
screw. Attach the suport bracket (TYPE G) in the inner
window sill with a screw (TYPE B), as shown Figure.
31.
7. Window installation of room air conditioner is now
completed. See ELECTRICAL DATA for attaching
power cord to electrical outlet.
3.2.4 HOW TO SECURE THE DRAIN PIPE
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. (Figure. 32)
Press the drain pipe into the hole by pushing down and
away from the fins to avoid injury.
Do not under any
circumstances cut
or remove the
grounding prong
from the plug.
Line Cord PlugUse Wall ReceptaclePower Supply
Power supply cord with
3-prong grounding plug
Standard 125V, 3-wire grounding
receptacle rated 15A, 125V AC
Use 15 AMP, time
delay fuse or circuit
breaker.
370 (14 9/16")
312 (12 1/4")
370 (14 9/16")
312 (12
1
/4")
29 (1
5
/32")
120 (4 3/4")
27.5 (1
3
/32")
346 (13
5
/8")
472 (18 9/16")
42 (1 21/32")
42 (1 21/32")
155(6
3
/
32
")
12
(0.4
1
/
16
")
472 (18 9/16")
22.5(0.8
3
/
32
")
Turn the air conditioner off, disconnect the power cord, remove the L bracket, the screws and support bracket installed through
the top and bottom of the guide panels, and save for reinstallation later. Close the guide panels. Keeping a firm grip on the air
conditioner, raise the sash, and carefully tilt the air conditioner backward, draining any condensate. Lift the air conditioner from
the window and remove the sash seal from between the windows.
3.3 ELECTRICAL DATA
USE OF EXTENSION CORDS
Because of potential safety hazards, we strongly discourage the use of an extension cord. However, if you wish to use an extension
cord, use a CSA certified/UL-listed 3-wire (grounding) extension cord, rated 15A, 125V.
Following is a brief description of the important components and their function in what is called the refrigeration
system. Reference should be made to Figure 33 to follow the refrigerating cycle and the flow of the refrigerant in
the cooling cycle.
In general, possible trouble is classified in two kinds.
The one is called Starting Failure which is caused by an electrical defect. The other is Ineffective Air Con-
ditioning caused by a defect in the refrigeration circuit and improper application.
Unit is running but cooling is ineffective.
Ineffective Cooling
Check cold air
circulation for smooth
flow.
Dirty indoor coil
(heat exchanger)
Malfunction of fan.
Clogging of air filter.
Obstruction at air outlet.
Check outdoor coil
(heat exchanger) and
fan operation.
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 looseterminal 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 overloadCheck 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.
LGE Internal Use Only
Page 24
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 disconnected, refer to wiring diagram for identification,
and replace the wires. Check the wire connections;
If not according to the wiring diagram, correct
the connections.
ThermistorCheck 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
Compressor cycles on Voltage Check the voltage. See the limits on the
overload. preceding page. If voltage is not within these limits,
Overload Check overload, if externally mounted.
Check the compressor overload if externally mounted.
Replace if open. (If the compressor temperature is
high, remove the overload, cool, and retest.)
call an electrician.
Replace if open. (If the compressor temperature
is high, remove the overload, cool, and retest.)