Wiring Requirements
The following table shows the maximum wire lengths allowed:
Thermostat to HVAC Equipment
18 AWG 20 AWG 22 AWG
128 ft/380 m 80 ft/240 m 50 ft/150 m
Terminal Description and Electrical Ratings
Terminal Description Voltage Current Max
N/C Unused N/A N/A
Y 1st stage compressor 30V AC 3A
W (O/B) 1st stage heating 30V AC 3A
or reversing valve
changeover
G Fan 30V AC 3A
RC Cool transformer * 30V AC 3A
RH Heat transformer * 30V AC 3A
C Common 30V AC 3A
Y2 2nd stage compressor 30V AC 3A
W2 (AUX) 2nd stage heating or 30V AC 3A
1st stage auxiliary heat
R1+ Input 1+ Dry contact only
R1- Input 1- Dry contact only
R2+ Input 2+ Dry contact only
R2- Input 2- Dry contact only
* Factory jumper installed between RC and RH. Remove jumper
for 2-transformer applications. See wiring diagrams for additional
information.
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