LG THERMA V Series, Руководство по установке, Страница: 45 / 124

45
PIPING AND WIRING FOR OUTDOOR UNIT
ENGLISH
Evacuation
- Connect the charge hose end described in the preceding steps to the vacuum pump to
evacuate the tubing and indoor unit.
Confirm the "Lo and Hi" 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.
- When the desired vacuum is reached, close the "Lo and Hi" knob of the manifold valve and stop
the vacuum pump.
Finishing the job
- With a service valve wrench, turn the valve stem of liquid side valve counter-clockwise to fully
open the valve.
- Turn the valve stem of gas side valve counter-clockwise to fully open the valve.
- Loosen the charge hose connected to the gas side service port slightly to release the pressure,
then remove the hose.
- 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.
- 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.
Required time for evacuation when 0.11 m
3
/h
vacuum pump is used
If tubing length is less than 10 m If tubing length is longer than 10 m
30 min. or more 60 min. or more
0.1 kPa or less
Vacuum pump
Liquid pipe
Gas pipe