reaches 500 microns. If the system still does not hold the pressure below 750 microns the system needs to be
rechecked for leaks.
5. After the system has been satisfactorily evacuated, the unit can be pre-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 pressure and temperatures.
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