Service manual
18
Caution:
Capacity is base on standard length and maximum allowance length is base of reliability.
Oil trap should be install per 5-7 meters.
8.4 Air purging of the piping and indoor unit
Required tools:
Hexagonal wrench; adjustable wrench; torque wrenches, wrench to hold the joints and gas leak detector.
Note:
The air in the indoor unit and in the piping must be purged. If air remains in the refrigeration piping, it will
affect the compressor, reduce the cooling capacity, and could lead to a malfunction of unit.
Be sure, using a torque wrench to tighten the service port cap (after using the service port), so that it
prevents the gas leakage from the refrigeration cycle.
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 connection 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.
In case that
more than 5m.
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