LG 5BPU0-02C, Engineering Product Data Book

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6. Installation
17
THERMA V
Split Type
Design and installation
6.6 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 isopen. 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 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 ofl liquid side valve counter-clockwise to fully open the valve.
2. Turn the valve stem of gas side valve counterclockwise to fully open the valve.
3. Loosen the charge hose connected to the gas side service port slightly to release the pressure, thenremove 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.
Required time for evacuation when 30 gal/h vacuum pump is used
If tubing length is less than 10 m(33 ft) If tubing length is longer than 10 m(33 ft)
30 min. or more 60 min. or more
0.5 torr or less
Outdoor unit
Lo Hi
Manifold valve
Vacuum pump
Open Open
Pressure
gauge
Indoor
Unit
※ According to each model, external appearance of
outdoor/indoor units could be different.