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Model
AS-H076QGA2_QNA2 AS-H096QGA2_QNA2 AS-H126RGA2_RNA2 LS-C096QLA2 LS-H096QLA2 LS-C126RLA2 LS-H126RGA2_RMA2_RLA2
Pages
68
Size
3.84 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner
File
as-h076qga2-qna2-as-h096qga2-qna2-as-h126rga2-rna2.zip
Date
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LG AS-H076QGA2_QNA2 / AS-H096QGA2_QNA2 / AS-H126RGA2_RNA2 / LS-C096QLA2 / LS-H096QLA2 / LS-C126RLA2 / LS-H126RGA2_RMA2_RLA2 Service Manual ▷ View online

Service Manual  45
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
46 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
CAUTION:
Use vacuum pump equipped with check value
applied to be prevented from flowing back-
ward.
Service Manual  47
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. 
CAUTION:
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)
48 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
(According to Indoor & Outdoor Temperature)
Page of 68
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