10-2014 gForce User Manual ● 25
service valves, they should remain closed. A deep vacuum gauge capable of registering
pressure in microns should be attached to the system for pressure readings. A shut-off
valve between the gauge connection and vacuum pump should be provided to allow the
system pressure to be checked after evacuation. Do not turn off vacuum pump when
connected to an evacuated system before closing shut-off valve.
Evacuate the refrigerant lines, condenser coil and evaporator coil to 500 microns or
lower (a micron gauge and 2-stage vacuum pump are required). Valve off and turn off
the vacuum pump and wait at least 15 minutes to make sure the micron gauge reading
does not go back above 750 microns. If it does, restart the vacuum pump and
evacuate until the system reaches 500 microns. If the system still does not hold the
pressure below 750 microns the system needs to be rechecked for leaks.
After the system has been satisfactorily evacuated the lines can be charged with
refrigerant. Connect the pressure gauge manifold set to the high and low ports near
the compressor. Connect the charging line to the refrigerant tank and set it for liquid
feed. Open the refrigerant tank valve and purge the line at the manifold, then open the
high side valve on the manifold only and allow the refrigerant to flow until the system
pressure equalizes. At this point the system will have 75 to 80% of the total refrigerant
charge. Start the blower and then the compressor checking the operating pressures
and temperatures.
WARNING:
Do not apply power to the compressor when in a vacuum.
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