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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 o and turn o 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 charg-
ing 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 ow 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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