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Service Manual 47
2-way, 3-way Valve
1. Air purging
Required tools : hexagonal wrench, adjustable
wrench, torque wrenches, wrench to
hold the joints, and gas leak detec-
tor.
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.
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.
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