Specifications

62 Catalog WSC/WDC-4
Control Power
The 115-volt control power can be supplied from the starter or a transformer (meeting the
requirements of McQuay Specification 359A999) separate from the starter. Either source must be
properly fused with 20-amp dual element fuses or with a circuit breaker selected for motor duty.
If the control transformer or other power source for the control panel is remote from the unit,
conductors must be sized for a maximum voltage drop of 3%. Required circuit ampacity is 20
amps at 115 volts. Conductor size for long runs between the control panel and power source,
based upon National Electrical Code limitations for 3% voltage drop, can be determined from the
table below.
Control Power Line Sizing
Maximum Length, ft (m) Wire Size (AWG) Maximum Length, ft (m) Wire Size (AWG)
0 (0) to 50 (15.2) 12 120 (36.6) to 200 (61.0) 6
50 (15.2) to 75 (22.9) 10 200 (61.0) to 275 (83.8) 4
75 (22.9) to 120 (36.6) 8 275 (83.8) to 350 (106.7) 3
Notes:
1. Maximum length is the distance a conductor will traverse between the control power source and the unit control panel.
2. Panel terminal connectors will accommodate up to number 10 AWG wire. Larger conductors will require an intermediate
junction box.