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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: LG
Device: Air Conditioner
File: as-c0764dm0-as-h0764dm0-ls-c1264dm0-ls-h0764dm0-as.zip
Date: 2018-11-20

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Service Manual  41
Troubleshooting Guide 
Balance Refrigerant of the 3-way Valve  
(Gas leakage)
• Procedure 
(1) Confirm that both the 2-way and 3-way valves
are set to the back seat. 
(2) Connect the charge set to the 3-way valve’s

port.  
–  Leave the valve on the charge set closed. 
– Connect the charge hose to the service port.  
(3) Open the valve (Lo side) on the charge set and
discharge the refrigerant until the gauge indi-
cates 0 kg/cm
2
G.
–  If there is no air in the refrigerant cycle (the
pressure when the air conditioner is not running
is higher than 1 kg/cm
2
G), discharge the refrig-
erant until the gauge indicates 0.5 to 1
kg/cm
2
G. if this is the case, it will not be neces-
sary to apply a evacuatin. 
– Discharge the refrigerant gradually; if it is dis-
charged too suddenly, the refrigeration oil will
also be discharged. 
Lo
Open
Open
3-Way
valve
3-Way
valve
Gas side
CLOSE
OPEN
Outdoor unit
Liquid side
Indoor unit

42 Room Air Conditioner
Troubleshooting Guide 
Evacuation 
(All amount of refrigerant leaked)
• Procedure 
(1) Connect the vacuum pump to the center hose
of charge set center hose 
(2) Evacuation for approximately one hour.  
–  Confirm that the gauge needle has moved
toward -76 cmHg (vacuum of 4 mmHg or less).  
(3) Close the valve (Lo side) on the charge set,
turn off the vacuum pump, and confirm that
the gauge needle does not move (approxima-
tely 5 minutes after turning off the vacuum
pump).
(4) Disconnect the charge hose from the vacuum

pump. 
–  Vacuum pump oil.
If the vacuum pump oil becomes dirty or
depleted, replenish as needed. 
Lo
Open
Open
Vacuum pump
3-Way
valve
Outdoor unit
Liquid side
Indoor unit
Gas side
3-Way
valve
CLOSE
OPEN
Use vacuum pump equipped with check value
applied to be prevented from flowing backward.

Service Manual  43
Troubleshooting Guide 
Gas Charging 
(After Evacuation)
• Procedure 
(1) Connect the charge hose to the charging

cylinder. 
–  Connect the charge hose which you dis-con-
nected from the vacuum pump to the valve at
the bottom of the cylinder. 
– If you are using a gas cylinder, also use a
scale and reverse the cylinder so that the sys-
tem can be charged with liquid. 
(2) Purge the air from the charge hose.   
–  Open the valve at the bottom of the cylinder
and press the check valve on the charge set to
purge the air. (Be careful of the liquid refriger-
ant).  The procedure is the same if using a gas
cylinder. 
(3) Open the valve (Lo side on the charge set and

charge the system with liquid refrigerant.
–  If the system can not be charged with the spec-
ified amount of refrigerant, it can be charged
with a little at a time (approximately 150g each
time) while operating the air conditioner in the
cooling cycle; however, one time is not suffi-
cient, wait approximately 1 minute and then
repeat the procedure (pumping down-pin).
(4) Immediately disconnect the charge hose from

the 3-way valve’s service port. 
–  Stopping partway will allow the gas to be dis-
charged.
– If the system has been charged with liquid
refrigerant while operating the air conditioner
turn off the air conditioner before disconnecting
the hose. 
(5) Mount the valve stem nuts and the service

port nut. 
– Use torque wrench to tighten the service port
nut to a torque of 1.8 kg.m.
– Be sure to check for gas leakage. 
This unit is charged with R-410A. 
Pay attention not to charge R-22.
\
This is different from previous procedures.
Because you are charging with liquid refrigerant
from the gas side, absolutely do not attempt to
charge with larger amounts of liquid refrigerant
while operating the air conditioner. 
Lo
Charging
cylinder 
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
Open
3-Way
valve
3-Way
valve
OPEN
Open
Check valve
(1)

44 Room Air Conditioner
Troubleshooting Guide 
Additional gas charging
(Gas leakage)
• When refrigerant is insufficient by leakage, recharge the unit with the refrigerant up to normal operating suc-
tion pressure.
• Use the graph or the equation below to get operating suction pressure according to indoor and outdoor tem-
perature.
Suction pressure was measured at 3-way valve service port after operating the unit for 10 minutes.
The method of using graph
- Find outdoor temperature.
- Find indoor temperature onto the curve of outdoor temperature.
- Read suction pressure at the axis of ordinates.
The method of using equation
-. Calculate suction pressure after putting indoor and outdoor temperature into the equation.
13
(At operating the Unit for 10 minutes)
Suction Pressure
(Kg/cm
2
.g)
Outdoor Temp.
(˚
C)
Indoor Temp. (˚C)
12
11
10
9
8
7
6
5
5
10
15
20
25
30
35
40
50˚C
40˚C
30˚C
20˚C
10˚C
0˚C
P = 3 + 0.0123 x T
out
1.5
 + 0.8 x T
in
0.5
Where, P
: Suction Pressure(kg/cm
2
.g)
Tout  : Outdoor Temperature(˚C)
Tin
: Indoor Temperature(˚C)
Operating Suction Pressure (For R401A)
(According to Indoor & Outdoor Temperature)

Display

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