LG LS-B0760CM/B0760HM Service Manual page 47

1) Re-air purging
(Re-installation)
Gas cylinder
R-22
• 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 g.
2
Indoor unit
Lo
OPEN
(Low handle)
Liquid side
Closed
2-Way
valve
Gas side
Closed
3-Way
valve
Manifold
Gauge
CLOSE
(High handle)
(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.
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Outdoor unit