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System Evacuation
Evacuation of the refrigeration system is necessary to remove all air and moisture from
the system. A reliable rotary vacuum pump with an accurate deep vacuum gauge is
recommended. Do not use the system compressor as a vacuum pump and do not
operate the compressor while the system is under vacuum.
Evacuation of “PR” model systems:
Open both the liquid and suction service valves.
Ensure the solenoid valve is energized and open.
Connect vacuum pump to the liquid and suction service valves.
Evacuate the system to 250 microns and maintain for a minimum of 4 hours.
Perform a vacuum decay test for a minimum of ten minutes to ensure the system
is leak free and dry.
Evacuation of “PC” model systems:
Leave the service valves closed, the condensing unit has been evacuated and is
charged with refrigerant.
Ensure the solenoid valve is energized and open.
Connect vacuum pump to the liquid and suction service valves.
Evacuate the system to 250 microns and maintain for a minimum of 4 hours.
Perform a vacuum decay test for a minimum of ten minutes to ensure the system
is leak free and dry.
Evacuation of “PCL” model systems:
“PCL” systems do not require evacuation; this process has been performed at
the factory.
CAUTION
Do not use the system compressor to evacuate the system. Do not start the
compressor while the system is under vacuum. This may damage to the compressor
and cause premature system failure.
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