Installer Guide 12
Wire Connections PSP1100
Wire Connections PSP2100
If the terminal designations on your old thermostat do not match those on the
new thermostat, refer to the chart below or the wiring diagrams that follow.
Wire from the Install on the
old thermostat Function new thermostat
terminal marked connector marked
C Common C (optional)
R, M, Vr, A Power RH*
(Heating Transformer)
Y1 or Y Cooling Y
W1, W or H Heating W
G or F Fan G
RC, R, M, Vr, A Power RC*
(Cooling Transformer)
O/B Rev. Valve O/B
Wire from the Install on the
old thermostat Function new thermostat
terminal marked connector marked
C Common C (optional)
Rc, R, M, Vr, A Power R
Y1 or Y Cooling Y
W1, W or H Auxiliary Heat W
G or F Fan G
B Reverse Valve B
(Energize to Heat)
O Reverse Valve O
(Energize to Cool)
* The RC and RH terminals have a factory installed jumper to control single transformer systems.
Remove this jumper to control dual transformer systems.
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