Vacuum - LG B70AWYN985 Installation Manual

Vacuum

1
Connect the charge hose end described in
the preceding steps to the vacuum pump
to evacuate the pipe and indoor unit.
Confirm the "Lo and Hi" knob of the mani-
fold valve is open. Then, run the vacuum
pump.
The operation time for evacuation varies
with pipe 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 pipe length is less
than 10 m(33 ft)
30 min. or more
0.5 torr or less
2
When the desired vacuum is reached,
close the "Lo and Hi" 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 liq-
uid side service valves and fasten them
tight.
This completes air purging with a vacuum
pump.
The air conditioner is now ready to test run.
If pipe length is longer
than 10 m(33 ft)
60 min. or more
PIPE CONNECTION
Outdoor unit
Manifold valve
Lo Hi Digital vacuum
gage
Open Open
Vacuum pump
29
Indoor unit