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INSTALLATION |
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If the code letter on your | then mark the wire | and connect to thermostat |
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existing thermostat is | with label shown | terminal shown |
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RH, R, VR or 4 24 Volt
RC, VC
24 Volt Cool
G or F
Fan
RH
x 
RH
RC
x 
RC
G
x
G
Y, C or M
Air Conditioning Compressor - or -
O
Reversing Valve operating in Cool mode. (Single Stage Heat Pumps ONLY.)
W or H Heating - or -
B
Reversing Valve operating in Heat mode. (Single Stage Heat Pumps ONLY.)
Y1
Heat Pump compressor
(Single Stage Heat Pumps ONLY.)
Y/O
x 
Y/O
W/B
x 
W/B
Y1
x 
Y1
NOTE: Do not connect a “Common” wire (sometimes labeled “C”) to any terminal on this thermostat. Tape up the wire and do not use. This wire provides electricity to