Quick Start Guide

8
Terminal designation:
Terminals What it means
RC 24VAC primary for cooling
RH 24VAC primary for heating
C 24VAC common
W1 1st stage Primary heating relay / Aux heat
W2 2nd stage Secondary heating relay / Aux heat
Y1 1st stage Primary compressor contactor
Y2 2nd stage Secondary compressor contactor
G Fan relay
O/B Changeover valve for heat pumps
S
Optional wiring module terminal to combine Y and G, while
reserve an extra in-wall wire to power on the thermostat
Do you have a C wire connected to your old thermostat?
3-2 Connect wires
RC
RH G
C
Y1 Y2
W1
W2 O/B
RC
G
Y1
W1
C
YES

3-2-1 NO

3-2-2