User Manual

11
colored wire by lling out the Wiring Chart
below. Note: If you see any of the following
wires, please contact our Customer Experience
Team to check system compatibility:
A. W3
B. H/HUM
C. A, X or P
Wiring Chart
Label
Old
Thermostat
Typical
Wire Color
Description
HUM Not used Humidier
NC Not used
W2/E Brown 2nd stage heat/
AUX/Emergency
heat
W1/
O/B
White/
Orange/
Blue
1st stage heat/HP
reversing valves
RH Red Power from heat,
24VAC transformer
RC Red Power from cooling,
24VAC transformer