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.
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.
- 52 -
Liquid side
Outdoor unit
3-way
valve
Gas side
Indoor unit
2-way
valve
Open
Clsed
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 liquid side valve coun-
terclockwise 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 liquid side valve to the open position and
remove the cap from the gas side 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 gas side valve to the back seat.
(7) Mount the valve stem nuts to the gas side and liq-
uid side valves.
(8) Check for gas leakage.
- At this time, especially check for gas leakage from
the stem nuts of both valves and from the service
port nut.
Caution
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,
discharge all of the gas through the service port,
and then recharge with the specified amount of
