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Model
LS-H186TNA2 LS-H246TLM1 LS-H246TNA2 LS-H266TGM1 S24LHP
Pages
67
Size
4 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner
File
ls-h186tna2-ls-h246tlm1-ls-h246tna2-ls-h266tgm1-s2.zip
Date
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LG LS-H186TNA2 / LS-H246TLM1 / LS-H246TNA2 / LS-H266TGM1 / S24LHP Service Manual ▷ View online

Service Manual  45
Troubleshooting Guide 
CAUTION:* Capicity is based on standard length and maximum allowance length
is the basis of reliability.
* Oil trap should be installed per 5~7 meters.
Outdoor unit
Indoor unit
A
B
A
Oil trap
Outdoor unit
Indoor unit
B
In case more than 5m
7k~14k
3/8"(Ø9.52)
1/4"(Ø6.35)
4 or 7.5
7
15
20
1/2"(Ø12.7)
1/4"(Ø6.35)
4 or 7.5
7
15
20
1/2"(Ø12.7)
1/4"(Ø6.35)
4 or 7.5
15
30
20
18k~28k
5/8"(Ø15.88)
1/4"(Ø6.35)
4 or 7.5
15
30
20
5/8"(Ø15.88)
3/8"(Ø9.52)
4 or 7.5
15
30
30
30k~38k
5/8"(Ø15.88)
3/8"(Ø9.52)
7.5
15
30
30
3/4"(Ø19.05)
3/8"(Ø9.52)
7.5
15
30
50
Pipe Size
Capacity
(Btu/h)
GAS
LIQUID
Additional
Refrigerant
(g/m)
Max. 
Length
A  (m)
Max.
Elevation
B  (m)
Standard
Length
(m)
Pipe Length and the Elevation
46 Room Air Conditioner
Troubleshooting Guide 
2-way,  3-way Valve 
2-way Valve (Liquid Side)
3-way Valve (Gas Side)
Shaft position
Shaft position
Service port 
Closed
Closed
Closed
(with valve cap)
(with valve cap)
(with cap) 
Open
Closed
Open
(counter-clockwise)
(clockwise)
(push-pin or with
vacumm pump)
Open
Open
Closed
(with valve cap)
(with valve cap)
(with cap)
Closed
Open
Open
(clockwise)
(counter-clockwise)
(connected manifold
gauge) 
Open
Open
Open
(with charging 
cylinder)
Open
Open
Open
(with charging
cylinder) 
Open
Open
Open
Open
Works
Shipping
Air purging
(Installation)
Operation
Pumping down
(Transfering)
Evacuation
(Servicing)
Gas charging
(Servicing)
Pressure check
(Servicing)
Gas releasing
(Servicing) 
1.
2.
3.
4.
5.
6.
Valve cap
Open position
Closed position
Pin
Service
port
Service
port cap
To outdoor unit
Flare nut
To 
piping 
connection
To outdoor unit
Hexagonal wrench (4mm)
Open position
Closed position
To 
piping 
connection
Flare nut
Open
(with charging cylinder)
Open
(with charging cylinder)
Service Manual  47
Troubleshooting Guide 
Required tools :  hexagonal wrench, adjustable wrench,
torque wrenches, wrench to hold the
joints, and gas leak detector. 
The additional gas for air purging has been charged
in the outdoor unit.
However, if the flare connections have not be done
correctly and there gas leaks, a gas cylinder and the
charge set will be needed. 
The air in the indoor unit and in the piping must be
purged. If air remains in the refrigeration pipes, it will
affect the compressor, reduce to cooling capacity,
and could lead to a malfunction. 
• Procedure 
(1) Recheck the piping connections.
(2) Open the valve stem of the 2-way valve coun-
terclockwise approximately 90°, wait 10 sec-
onds, and then set it to closed position. 
–  Be sure to use a hexagonal wrench to operate
the valve stem. 
(3) Check for gas leakage.
–  Check the flare connections for gas leakage. 
(4) Purge the air from the system. 
–  Set the 2-way valve to the open position and
remove the cap from the 3-way valve’s service
port.
–  Using the hexagonal wrench to press the valve
core pin, discharge for three seconds and then
wait for one minute. Repeat this three times. 
(5) Use torque wrench to tighten the service port
nut to a torque of 1.8kg.cm. 
(6) Set the 3-way valve to the back seat. 
(7) Mount the valve stem nuts to the 2-way and 3-
way valves. 
(8) Check for gas leakage. 
–  At this time, especially check for gas leakage
from the 2-way and 3-way valve’s stem nuts,
and from the service port nut. 
Service port nut:
Be sure, using a torque wrench to tighten the service port nut (after using the service port), so that it prevents the
gas leakage from the refrigeration cycle.
CAUTION: Do not leak the gas in the air during Air purging. 
CAUTION: If gas leakage are discovered
in step (3) above, take the following
mesures : 
If the gas leaks stop when the piping connections
are tightened further, continue working from step (4). 
If the gas leaks do not stop when the connections
are retightened, repair the location of the leak, dis-
charge all of the gas through the service port, and
then recharge with the specified amount of gas from
a gas cylinder. 
Liquid side
Outdoor unit
3-way
valve
Gas side
Indoor unit
2-way
valve
Open
Clsed
Air purging
48 Room Air Conditioner
Troubleshooting Guide 
• Procedure 
(1) Confirm that both the 2-way and 3-way valves
are set to the open position.  
–  Remove the valve stem caps and confirm that
the valve stems are in the raised position. 
– Be sure to use a hexagonal wrench to operate
the valve stems. 
(2) Operate the unit for 10 to 15 minutes. 
(3) Stop operation and wait for 3 minutes, then
connect the charge set to the service port of
the 3-way valve.
–  Connect the charge hose with the push pin to
the service port.
(4) Air purging of the charge hose.
–  Open the low-pressure valve on the charge set
slightly to air purge from the charge hose. 
(5) Set the 2-way valve to the closed position. 
(6) Operate the air conditioner at the cooling
cycle and stop it when the gauge indicates
1kg/cm
2
g.
(7) Immediately set the 3-way valve to the closed
position.
–  Do this quickly so that the gauge ends up indi-
cating 3 to 5kg/cm
2
g.
(8) Disconnect the charge set, and mount the 2-
way and 3-way valve’s stem nuts and the ser-
vice 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. 
Lo
Closed
Purge the air
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
Open
2-Way
valve
3-Way
valve
CLOSE
Pumping Down 
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