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G RC RH Y W
if your existing
thermostat is marked...
label the wire
with this sticker:
G / F
G
G
W / H / B
W/B
W/B
Y / C* / M / O
Y/0
Y/0
RC / VC
RC
RC
RH / R / VR / 4
RH
RH
24 Volt
24 Volt cool
air conditioning
compressor
heating
fan
Y1
Y1
Y1
heat pump
compressor
WIRE LABELS