
INSTALLING THE THERMOSTAT
TERMINAL DESIGNATIONS
TERMINAL
DESIGNATION
S2
Outdoor Sensor
SC
Sensor Common
S1
Indoor Sensor
AUX
Auxiliary Contacts
W2/OB
Second Stage Heat or Reversing Valve
Y1
First Stage Cool or First Stage Compressor
Y2
Second Stage Cool or Second Stage Compressor
W1
First Stage Heat/Auxiliary/Emergency Heat
G
Fan
R
24 VAC Hot
C
24 VAC Common
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