LG Electronics LA120HPO Air Conditioner User Manual


 
Service Manual 57
Troubleshooting Guide
1) Re-air purging
(Re-installation)
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 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 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 dis-
charge the refrigerant until the gauge indicates
3 to 5 kg/cm
2
g.
(6) Disconnect the charge set and the gas cylin-
der, 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.
(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
Outdoor unit
Indoor unit
Liquid side
Gas side
CLOSE
3-Way
valve
3-Way
valve
Refrigerant