LG LS-B0760CM/B0760HM Service Manual page 45

1. Air purging
Required tools: Hexagonal wrench, adjustable wrench,
torque wrenches, wrench to hold the
joints, and gas leak detector.
The additioner gas for air purging has been charged in
the outdoor unit.
However, if the flare connections have not been done
correctly and there gas leaks, a gas cylinder and the
charge set will be needed.
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 counter-
clockwise 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.
Liquid side
Indoor unit
Gas side
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.
Outdoor unit
Open
2-way
valve
Close
3-way
valve
(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 vlave's stem nuts, and from
the service port nut.
If gas leakage are discovered in step (3) above, take
the following measures:
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.
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Caution