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details. As soon as the compressors comes on, observe the compressor pressure difference for
a few seconds and then turn the Cool 1 OFF.
An out of phase fixed speed scroll compressor will draw relatively low amps and both suction
and discharge pressures will remain nearly equal. If necessary, reverse any two of the three
input line voltage wires at the line voltage field connection point to change the compressor
rotation.
If equipped with dual circuits, repeat these steps for circuit 2 compressor but use the Cool 2
under the dap4 MENU I – MANUAL CONTROL (Service Level).
Units shipped from the factory are run tested to ensure the compressor rotation is consistent
with evaporator fan motor. However, a field change-out of a compressor may require checking
proper phase.
Heat Exchanger Phase Check
GHRC Air-Cooled Heat Exchanger Phase Check
Air-cooled GHRC condensers and GHRU condensing unit heat exchangers are only offered in
three phase voltages and the individual EC fan motors will only operate in one direction but
the rotation of the compressor on GHRU units must be checked. See the GHRC Air-Cooled
Condensers Installation, Operations and Maintenance Manual for additional information
regarding this type of heat exchanger.
DARC Heat Exchangers Phase Check
See the DARC Air-Cooled Condensers Installation, Operations and Maintenance Manual for
proper phase check procedures.
Line Set Charge Calculations
1. Since most of the refrigerant weight is in liquid form in the liquid line, refrigerant in the
hot gas line and suction line is ignored in the charging calculation.
2. Calculate the total of the liquid line run, then multiply the equivalent feet of the line based
on the line size by the correct multiplier to get the refrigerant weight needed for the line-
set.
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