LG LSC121PMA Service Manual - Page 36

Air purging

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1. Air purging 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. Indoor unit Liquid side Open 2-way valve Outdoor unit Gas side Clsed 3-way valve 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. • Procedure (1) Recheck the piping connections. (2) Open the valve stem of the 2-way valve counterclockwise approximately 90°, wait 10 seconds, 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 3way 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. 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, discharge all of the gas through the service port, and then recharge with the specified amount of gas from a gas cylinder. -36-

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1. Air purging
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
counterclockwise approximately 90°, wait 10
seconds, 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.
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,
discharge all of the gas through the service port,
and then recharge with the specified amount of
gas from a gas cylinder.
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.
Liquid side
Outdoor unit
3-way
valve
Gas side
Indoor unit
2-way
valve
Open
Clsed
-36-