LG Electronics LA120HPO, LA090HPO, LA120CPO Soap water method, Evacuation, Finishing the job

Air purgingd

Soap water method

1.	Remove the caps from the 2-way and 3-way valves.
2.	Remove the service-port cap from the 3-way valve.
3.	To open the 2-way valve turn the valve stem counterclock-
	wise approximately 90°, wait for about 2~3 sec, and close it.
4.	Apply a soap water or a liquid neutral detergent on the
	indoor unit connection or outdoor unit connections by a soft

Liquid side

Gas side

brush to check for leakage of the connecting points of the

piping.

5. If bubbles come out, the pipes have leakage

Evacuation

1. Connect the charge hose end described in the preceding

steps to the vacuum pump to evacuate the tubing and

indoor unit.

Confirm the "Lo" knob of the manifold valve is open.

Then, run the vacuum pump.

2-way valve (Open)

3-way valve (Close)

Hexagonal wrench

Cap

The operation time for evacuation varies with tubing

length and capacity of the pump. The following table

shows the time required for evacuation.

Required time for evacuation when 30 gal/h vacuum

pump is used

If tubing length is less	If tubing length is longer
than 10m (33 ft)	than 10m (33 ft)
10 min. or more	15 min. or more

2.When the desired vacuum is reached, close the "Lo" knob of the manifold valve and stop the vacuum pump.

Finishing the job

1.With a service valve wrench, turn the valve stem of liquid side valve counter-clockwise to fully open the valve.

2.Turn the valve stem of gas side valve counter-clockwise to fully open the valve.

3.Loosen the charge hose connected to the gas side ser- vice port slightly to release the pressure, then remove the hose.

4.Replace the flare nut and its bonnet on the gas side ser- vice port and fasten the flare nut securely with an adjustable wrench. This process is very important to pre- vent leakage from the system.

5.Replace the valve caps at both gas and liquid side ser- vice valves and fasten them tight.

This completes air purging with a vacuum pump. The air conditioner is now ready to test run.

Indoor unit

Outdoor unit

	Manifold valve
Pressure		Hi
gauge	Lo
	Open	Close

Vacuum pump

30Room Air Conditioner