LG LSC121PMA Service Manual - Page 38

Re-air purging

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1) Re-air purging (Re-installation) Indoor unit Liquid side Closed 2-Way valve Outdoor unit Gas cylinder Gas side Closed 3-Way valve Lo R22 OPEN CLOSE • Procedure (1) Confirm that both the 2-way valve and the 3way valve are set to the closed position. (2) Connect the charge set and a gas cylinder to the service port of the 3-way 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 2-way valve approximately 45° for 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 the 2-way 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 refrigerant until the gauge indicates 3 to 5 kg/cm2g. (6) Disconnect the charge set and the gas cylinder, and set the 2-way and 3-way valves to the open position. - Be sure to use a hexagonal wrench to operate the valve stems. (7) 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. -38-

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1) Re-air purging
(Re-installation)
• Procedure
(1) Confirm that both the 2-way valve and the 3-
way valve are set to the closed position.
(2) Connect the charge set and a gas cylinder to
the service port of the 3-way 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 2-way valve approximately 45° for 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 the 2-way 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 refrigerant until the gauge
indicates 3 to 5 kg/cm
2
g.
(6) Disconnect the charge set and the gas
cylinder, and set the 2-way and 3-way valves
to the open position.
– Be sure to use a hexagonal wrench to operate
the valve stems.
(7) 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.
Lo
Closed
OPEN
Closed
Gas cylinder
R22
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
2-Way
valve
3-Way
valve
-38-