LG Electronics LA120CPO, LA120HPO, LA090HPO, LA120HPI, LA120CPI service manual Re-air purging

Troubleshooting Guide

1) Re-air purging

(Re-installation)

Indoor unit Liquid side

Closed Outdoor unit

3-Way valve

Gas side

Closed

3-Way valve

Gas cylinder

		Lo
Refrigerant	OPEN	CLOSE

• 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/cm2g.

(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.

Service Manual 57