LG Electronics LSU240CE, LSN090CE, LSU120CE, LSU090HE, LSU090CE, LSN180CE Pumping Down, Procedure

Troubleshooting Guide

Pumping Down

Indoor unit Liquid side

Open Outdoor unit

2-Way valve

Gas side

Closed

3-Way valve

Lo

CLOSECLOSE

Purge the air

• Procedure

(1)Confirm that both the 2-way and 3-way valves are set to the open position.

–Remove the valve stem caps and confirm that the valve stems are in the raised posi- tion.

–Be sure to use a hexagonal wrench to operate the valve stems.

(2)Operate the unit for 10 to 15 minutes.

(3)Stop operation and wait for 3 minutes, then connect the charge set to the service port of the 3-way valve.

–Connect the charge hose with the push pin to the service port.

(4)Air purging of the charge hose.

–Open the low-pressure valve on the charge set slightly to air purge from the charge hose.

(5)Set the 2-way valve to the closed position.

(6)Operate the air conditioner at the cooling cycle and stop it when the gauge indi- cates 1kg/cm2g.

(7)Immediately set the 3-way valve to the closed position.

–Do this quickly so that the gauge ends up indicating 3 to 5kg/cm2g.

(8)Disconnect the charge set, and mount the 2-way and 3-way valve’s 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.

Do not use the existing charge set for R-22. It is necessary to use new charge set for R- 410A. The pressure of R-410A is 1.6 times higher than that of R-22. Thus, the high pres- sure side gauge of charge set should be used higher pressure gauge of 50kg/cm2 range.

46Room Air Conditioner