LG LS305HV User Manual download pdf (Page 27)

Installation Manual 27

ENGLISH

Installation

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

counterclockwise 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 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.

The operation time for evacuation varies with

tubing length and capacity of the pump. The

following table shows the time required for

evacuation.

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 service port slightly to release the pressure,

then remove the hose.

4. Replace the flare nut and its bonnet on the gas

side service port and fasten the flare nut

securely with an adjustable wrench. This

process is very important to prevent leakage

from the system.

5. Replace the valve caps at both gas and liquid

side service valves and fasten them tight.

This completes air purging with a vacuum pump.

The air conditioner is now ready to test run.

Gas side

Liquid side

Cap

Hexagonal wrench

2-way valve

(Open)

3-way valve

(Close)

Required time for evacuation when 30 gal/h vacuum

pump is used

10 min. or more 15 min. or more

If tubing length is less

than 10m (33 ft)

If tubing length is longer

than 10m (33 ft)

Indoor unit

Outdoor unit

Lo Hi

Manifold valve

Vacuum pump

Pressure

gauge

Open

1 2 ... 22 23 24 25 26 27 28 29 30 31

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LG LS305HV User Manual Page 27

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