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Lo
Closed
OPEN
Closed
Gas cylinder
R410A
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
3-Way
valve
3-Way
valve
• Procedure
(1) Confirm that both the liquid side valve and the gas side
valve are set to the closed position.
(2) Connect the charge set and a gas cylinder to the service
port of the Gas side valve.
– Leave the valve on the gas cylinder closed.
(3) Air purging.
– Open the valves on the gas cylinder and the charge set. Purge
the air by loosening the flare nut on the liquid side valve ap-
proximately 45
o
or 3 seconds then closing it for 1 minute;repeat
3 times.
– After purging the air, use a torque wrench to tighten the flare
nut on liquid side valve.
(4) Check for gas leakage.
– Check the flare connections for gas leakage.
(5) Discharge the refrigerant.
– Close the valve on the gas cylinder and discharge the refriger-
ant until the gauge indicates 3 to 5 kg/cm
2
g.
(6) Disconnect the charge set and the gas cylinder, and set
the Liquid side and Gas side valves to the open position.
– Be sure to use a hexagonal wrench to operate the valve stems.
(8) Mount the valve stem nuts and the service port nut.
– Use torque wrench to tighten the service port nut to a torque of
1.8 kg.m.
– Be sure to check for gas leakage.
CAUTION: Do not leak the gas in the air during Air Purging.
Troubleshooting
70