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If your existing
thermostat is marked...
label the wire
with this sticker:
RH / R / VR / 4
RH
RH
24 Volt
RC / VC
RC
RC
24 Volt Cool
Y / C* / M
Y
Y
air conditioning
compressor
W / H
W
W
heating
G / F
G
G
fan
* See pg 27 for complete wiring diagram.