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WC-IOM-7 • Packaged Heat Pump 33
Installation
Electrical Phasing
(Three Phase Motors)
The compressor motor(s) and the supply fan motor are internally connected for
the proper rotation when the incoming power supply is phased as A, B, C.
Proper electrical supply phasing can be quickly determined and corrected before
starting the unit by using an instrument such as an Associated Research Model
45 Phase Sequence Indicator and following the steps below:
• Turn the field supplied disconnect switch that provides power to the main
power terminal block or to the “Line” side of the optional factory mounted
disconnect switch to the “Off” position.
• Connect the phase sequence indicator leads to the terminal block or to the
“Line” side of the optional factory mounted disconnect switch as follows;
Black (phase A) to L1
Red (phase B) to L2
Yellow (phase C) toL3
• Close the field supplied main power disconnect switch or circuit protector
switch that provides the supply power to the unit.
ƽWARNING
Live Electrical Components!
During installation, testing, servicing and troubleshooting of this product, it may
be necessary to work with live electrical components. Have a qualified licensed
electrician or other individual who has been properly trained in handling live
electrical components perform these tasks. Failure to follow all electrical safety
precautions when exposed to live electrical components could result in death or
serious injury.
To prevent injury or death from electrocution, it is the responsibility of the
technician to recognize this hazard and use extreme care when performing
service procedures with the electrical power energized.
• Observe the ABC and CBA phase indicator lights on the face of the
sequencer. The ABC indicator light will glow if the phase is ABC. If the CBA
indicator light glows, open the disconnect switch or circuit protection switch
and reverse any two power wires.
• Restore the main electrical power and recheck the phasing. If the phasing is
correct, open the disconnect switch or circuit protection switch and remove
the phase sequence indicator.
Compressor Crankcase Heaters (Optional)
Each compressor can be equipped with a crankcase heater. The proper operation
of the crankcase heater is important to maintain an elevated compressor oil
temperature during the “Off” cycle to reduce oil foaming during compressor