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Model
AS-C0764DM0 AS-H0764DM0 LS-C1264DM0 LS-H0764DM0 AS-C0964DM0 AS-H0964DM0 LS-C1865DM0 LS-H0964DL0 AS-C1264DM0 AS-H1264DM0 LS-C2665DM0 LS-H1264DM0 AS-C1865DM0 AS-H1865DM0 LS-C0964DA0 LS-H1865DM0 AS-C2465DM0 AS-H2465DM0 LS-C0964DM0 LS-H2665DM0 AS-C0764DB0 AS-H0764GM0 LS-C1865DB0 LS-H2465DM0 AS-C0964DB0 AS-H0964GM0 LS-C1264DA0 LS-H0964DM0 AS-C1264DB0 AS-H1264GM0 LS-C2465DB0 AS-C1865DB0 AS-H1865GM0 LS-C2465GB0 AS-C2465DB0 AS-H2465GM0 LS-C1865DM1 LS-C1865GB0 LS-C2665DM1 AS-C0764DH0 AS-C0964DH0 AS-C1264DH0 AS-C1865DH0 AS-C2465DH0 AS-C0964DA0 AS-C1264DA0 AS-C0964GA0 AS-C1264GA0 AS-C1865GB0 AS-C2465GB0 AS-H0964DA0 AS-H1264DA0 AS-H1865DB0 LS-C1264DM1 AS-H2465DB0 LS-C1264GA0 AS-H0964GA0 LS-C1264GB0 AS-H1264GA0 LS-C0964DM1 AS-H1865GB0 AS-H2465GB0 AS-H2465DM1 LS-H0964DY0 LS-H1264DY0 LS-H1865DY0 LS-H2465DY0 LS-H0764DM1 LS-H0964DM1 LS-H1264DM1 LS-H1865DM1 LS-H2465DM1 LS-H2665DM1 LS-H2465GB0 LS-H0964GB0 LS-H1264GB0
Pages
105
Size
7.49 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner
File
as-c0764dm0-as-h0764dm0-ls-c1264dm0-ls-h0764dm0-as.zip
Date
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LG AS-C0764DM0 / AS-H0764DM0 / LS-C1264DM0 / LS-H0764DM0 / AS-C0964DM0 / AS-H0964DM0 / LS-C1865DM0 / LS-H0964DL0 / AS-C1264DM0 / AS-H1264DM0 / LS-C2665DM0 / LS-H1264DM0 / AS-C1865DM0 / AS-H1865DM0 / LS-C0964DA0 / LS-H1865DM0 / AS-C2465DM0 / AS-H2465DM0 / LS-C0964DM0 / LS-H2665DM0 / AS-C0764DB0 / AS-H0764GM0 / LS-C1865DB0 / LS-H2465DM0 / AS-C0964DB0 / AS-H0964GM0 / LS-C1264DA0 / LS-H0964DM0 / AS-C1264DB0 / AS-H1264GM0 / LS-C2465DB0 / AS-C1865DB0 / AS-H1865GM0 / LS-C2465GB0 / AS-C2465DB0 / AS-H2465GM0 / LS-C1865DM1 / LS-C1865GB0 / LS-C2665DM1 / AS-C0764DH0 / AS-C0964DH0 / AS-C1264DH0 / AS-C1865DH0 / AS-C2465DH0 / AS-C0964DA0 / AS-C1264DA0 / AS-C0964GA0 / AS-C1264GA0 / AS-C1865GB0 / AS-C2465GB0 / AS-H0964DA0 / AS-H1264DA0 / AS-H1865DB0 / LS-C1264DM1 / AS-H2465DB0 / LS-C1264GA0 / AS-H0964GA0 / LS-C1264GB0 / AS-H1264GA0 / LS-C0964DM1 / AS-H1865GB0 / AS-H2465GB0 / AS-H2465DM1 / LS-H0964DY0 / LS-H1264DY0 / LS-H1865DY0 / LS-H2465DY0 / LS-H0764DM1 / LS-H0964DM1 / LS-H1264DM1 / LS-H1865DM1 / LS-H2465DM1 / LS-H2665DM1 / LS-H2465GB0 / LS-H0964GB0 / LS-H1264GB0 Service Manual ▷ View online

Service Manual  25
Checking the drainage and forming the pipings
Checking the drainage and forming the pipings
Checking the drainage
Form the piping
To remove the front panel from the indoor unit.
• Set the air direction louvers up-and-down to the
position(horizontally) by hand.
• Remove the securing screws that retain the front panel.
Pull the lower left and right sides of the grille toward you
and lift it off.
Form the piping by wrapping the connecting
portion of the indoor unit with insulation mate-
rial and secure it with two kinds of vinyl tapes.
• If you want to connect an additional drain hose, the end of
the drain outlet should be routed above the ground. Secure
the drain hose appropriately.
In cases where the outdoor unit is installed
below the indoor unit perform the following.
• Tape the piping, drain hose and connecting cable from
down to up.
• Secure the tapped piping along the exterior wall using sad-
dle or equivalent.
To check the drainage.
• Pour a glass of water on the evaporator.
• Ensure the water flows through the drain hose of the indoor
unit without any leakage and goes out the drain exit.
In cases where the Outdoor unit is installed
above the Indoor unit perform the following.
• Tape the piping and connecting cable from down to up.
• Secure the taped piping along the exterior wall. Form a trap
to prevent water entering the room.
• Fix the piping onto the wall by saddle or equivalent.
Drain piping
• The drain hose should point downward for easy drain flow.
• Do not make drain piping.
Pull the right and
the left side.
Downward slope
Do not raise
Accumulated
drain water
Tip of drain hose 
dipped in water
Air
Waving
Water
leakage
Water
leakage
Ditch
Less than 
50mm gap
Water
leakage
Taping
Drain
hose
Pipings
Connecting
cable
Trap is required to prevent water
from entering into electrical parts.
Seal small openings
around pipings with a
gum type sealer.
Seal a small opening 
around the pipings 
with gum type sealer.
Trap
Trap
26 Room Air Conditioner
Air purgingd 
Air and moisture remaining in the refrigerant system have
undesirable effects as indicated below.
• Pressure in the system rises.
• Operating current rises.
• Cooling(or heating) efficiency drops.
• Moisture in the refrigerant circuit may freeze and block cap-
illary tubing.
• Water may lead to corrosion of parts in the refrigeration
system.
Therefore, the indoor unit and tubing between the indoor and
outdoor unit must be leak tested and evacuated to remove
any noncondensables and moisture from the system.
• Do a leak test of all joints of the tubing(both indoor and out-
door) and both gas and liquid side service valves.
Bubbles indicate a leak. Be sure to wipe off the soap with a
clean cloth.
• After the system is found to be free of leaks, relieve the
nitrogen pressure by loosening the charge hose connector
at the nitrogen cylinder. When the system pressure is
reduced to normal, disconnect the hose from the cylinder.
Preparation
• Check that each tube(both liquid and gas side tubes)
between the indoor and outdoor units have been properly
connected and all wiring for the test run has been complet-
ed. Remove the service valve caps from both the gas and
the liquid side on the outdoor unit. Note that both the liquid
and the gas side service valves on the outdoor unit are
kept closed at this stage.
Leak test
• Connect the manifold valve(with pressure gauges) and dry
nitrogen gas cylinder to this service port with charge hoses.
• Pressurize the system to no more than 150 P.S.I.G. with
dry nitrogen gas and close the cylinder valve when the
gauge reading reached 150 P.S.I.G. Next, test for leaks
with liquid soap.
AIR PURGING 
Air purging
Air purging with vacuum pump
Be sure to use a manifold valve for air purging. If it is not
available, use a stop valve for this purpose. The "Hi" knob
of the manifold valve must always be kept close.
To avoid nitrogen entering the refrigerant system in a liquid
state, the top of the cylinder must be higher than its bottom
when you pressurize the system. Usually, the cylinder is
used in a vertical standing position.
Lo
Hi
Indoor unit
Outdoor unit
Manifold valve
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
Pressure 
gauge
Service Manual  27
Air purgingd 
Evacuation
• Connect the charge hose end described in the preceding
steps to the vacuum pump to evacuate the tubing and
indoor unit.
Confirm the "Lo" knob of the manifold valve is open. Then,
run the vacuum pump.
The operation time for evacuation varies with tubing length
and capacity of the pump. The following table shows the
time required for evacuation.
• When the desired vacuum is reached, close the "Lo" knob
of the manifold valve and stop the vacuum pump.
Finishing the job
• With a service valve wrench, turn the valve stem of liquid
side valve counter-clockwise to fully open the valve.
• Turn the valve stem of gas side valve counter-clockwise to
fully open the valve.
• Loosen the charge hose connected to the gas side service
port slightly to release the pressure, then remove the hose.
• Replace the flare nut and its bonnet on the gas side service
port and fasten the flare nut securely with an adjustable
wrench. This process is very important to prevent leakage
from the system.
• Replace the valve caps at both gas and liquid side service
valves and fasten them tight.
This completes air purging with a vacuum pump. 
The air conditioner is now ready to test run.
(1) Remove the caps from the 2-way and 3-way valves.
(2) Remove the service-port cap from the 3-way valve.
(3) To open the 2-way valve turn the valve stem counter-
clockwise approximately 90°, wait for about 2~3 sec, and
close it.
(4) Apply a soap water or a liquid neutral detergent on the
indoor unit connection or outdoor unit connections by a
soft brush to check for leakage of the connecting points
of the piping.
(5) If bubbles come out, the pipes have leakage.
Soap water method
Gas side
Liquid side
Cap
Hexagonal wrench
2-way valve
(Open)
3-way valve
(Close)
Required time for evacuation when 30 gal/h vacuum
pump is used
10 min. or more
15 min. or more
If tubing length is less than 10m (33 ft)
if tubing length is longer than 10m (33 ft)
Indoor unit
Outdoor unit
Lo
Hi
Manifold valve
Vacuum pump
Pressure 
gauge
Open
Close
28 Room Air Conditioner
Test running
TEST RUNNING
1. Check that all tubing and wiring have been properly con-
nected.
2. Check that the gas and liquid side service valves are fully
open.
Settlement of outdoor unit
• Anchor the outdoor unit with a bolt and nut(ø10mm) tightly
and horizontally on a concrete or rigid mount.
• When installing on the wall, roof or rooftop, anchor the
mounting base securely with a nail or wire assuming the
influence of wind and earthquake.
• In the case when the vibration of the unit is conveyed to the
hose, secure the unit with an anti-vibration bushing.
NOTE: If the actual pressure is higher than shown, the system is
most likely over-charged, and charge should be removed. 
If the actual pressure are lower than shown, the system is
most likely undercharged, and charge should be added.
The air conditioner is now ready for use.
Power-Failure Compensation Function User Selection ON/OFF 
1) Operation Sequence 
Press the forced switch until BUZZER sounds 2 times
(beep~beep~).
Release the forced switch if BUZZER sounds. 
Check the function selection ON/OFF with the operation LED. 
2) Checking function-selection ON/OFF 
- Function-Selection ON: One time blinking of operation LED
would repeat 4 times. 
- Function-Selection OFF: Two times blinking of operation LED
would repeat 4 times.
Evaluation of the performance
Operate unit for 15~20 minutes, then check the system
refrigerant charge:
1. Measure the pressure of the gas side service valve.
2. Measure the temperature of the intake and discharge of air.
3. Ensure the difference between the intake temperature and
the discharge is more than 8°C(46°F) (Cooling) or
(Heating).
4. For reference; the gas side pressure of optimum condition
is as below.(Cooling)
Bolt
Tubing connection
Discharge 
temperature
Discharge air
Intake temperature
R-22
35°C (95°F)
4~5kg/cm
2
G(56.8~71.0 P.S.I.G.)
R-410A
35°C (95°F)
8.5~9.5kg/cm
2
G(120~135 P.S.I.G.)
Outside ambient
TEMP.
Refrigerant
The pressure of the gas side 
service valve.
This is performed when the unit is to be relocated or
the refrigerant circuit is serviced.
Pump Down means collecting all refrigerant in the outdoor
unit without loss in refrigerant gas.
CAUTION:
Be sure to perform Pump Down procedure with the unit
cooling mode.
Pump Down Procedure
1. Connect a low-pressure gauge manifold hose to the
charge port on the gas side service valve.
2. Open the gas side service valve halfway and purge the air
from the manifold hose using the refrigerant gas.
3. Close the liquid side service valve(all the way in).
4. Turn on the unit's operating switch and start the cooling
operation.
5. When the low-pressure gauge reading becomes 1 to
0.5kg/cm2 G(14.2 to 7.1 P.S.I.G.), fully close the gas side
valve stem and then quickly turn off the unit. At that time,
Pump Down has been completed and all refrigerant gas
will have been collected in the outdoor unit.
PUMP DOWN
Power
button
Page of 105
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