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if your existing
thermostat is marked:
label the wire
with this sticker:
RH
RH
RH
Heating Transformer
Power Supply
Y1 / Y2
Cooling Stage 1 or 2
W1 / W2
Heating Stage 1 or 2
C
C
C
24 VAC Common
(if available)
CONVENTIONAL HVAC SYSTEMS
G
G
G
Fan
R / RC
R/RC
R/RC
Cooling Transformer
Power Supply
if your existing
thermostat is marked:
label the wire
with this sticker:
W1 W2
W2 W1
Y1 Y2
Y2 Y1
See pages 72-73 for a complete wiring diagram.
44002-01 r051807