Unitary Ducted Split AC
16
Leak Testing
Leak test all joints indoors, outdoors, and refrigerant tubing.
Evacuate Refrigerant Tubing and Indoor Coil
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage or improper operation.
Never use the system compressor as a vacuum pump.
Refrigerant tubes and indoor coil should be evacuated using the recommended deep vacuum
method of 500 microns. The alternate triple evacuation method may be used if the procedure
outlined below is followed.
IMPORTANT:
Always break a vacuum with dry nitrogen.
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500
microns and a vacuum gage capable of accurately measuring this vacuum depth. The deep
vacuum method is the most positive way of assuring a system is free of air and liquid water. See
Fig. 24.
Fig.24- Deep Vacuum Graph
Fig.25—Triple Evacuation Method
