Evacuation - LG LUU188HV Installation Manual

LEAKAGE TEST AND EVACUATION
16

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 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.
Required time for evacuation when 30
gal/h(114 l/h) vacuum pump is used
If tubing length is less
than 10 m(33 ft)
30 min. or more
0.07 kPa (0.01psi)(0.53torr) 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
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.
If tubing length is
longer than 10 m(33 ft)
60 min. or more
Indoor unit
Outdoor unit
Manifold valve
Lo Hi
Open
Vacuum pump
Gas pipe
Pressure
gauge
Open