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2.7 Vacuum and gas leakage test
1. Use vacuum Pump
1) Air and humidity left inside the refrigerant circuit
can cause compressor malfunction. After having
connected the indoor and outdoor units, bleed the
air and humidity from the refrigerant circuit by using
a vacuum pump.
2) Open the piezometer and operation for 10-
15minutes to check if the pressure of piezometer
remains in -0.1Mpa.
3) Close the vacuum pump and maintain this
status for 1-2min to check if the pressure of
piezometer remains in -0.1Mpa. If the pressure
decrease, there may be leakage.
4) Remove the piezometer, open the valve core
of liquid valve and gas valve completely.
5) Tighten the screw caps of valve and
refrigerant charging vent.
s ervice port
2. Leakage Detection
1).With leakage detection.
Check if there is leakage with leakage detection.
2).With soap water. If leakage detection is not
available, please use soap water for leakage
detection. Apply soap water at the suspected
position and keep the soap water for more than
3min. If there are air bubbles coming out of this
position, there a leakage.
Air Conditioner Service Manual
vacuum pump
2.8 Final test
1 Preparation of test operation.
The client approves the air conditioner
installation.
Specify the important notes for air conditioner
to the client.
2 Method of test operation
Put through the power, press ON/OFF button
on the remote controller to start operation.
Press MODE button the select AUTO, COOL,
DRY, FAN and HEAT to check whether the
operation is normal or not.
If ambient temperature is lower than 16° C,
the air conditioner can't start cooling.
2
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