Step #3 Wire Connections
4
If the terminal designations on your old thermostat do not match
those on the new thermostat, refer to the chart below.
4-Pipe Systems
Wire from the Install on the
old thermostat Function new thermostat
terminal marked terminal marked
Y1, Y Cooling Y1
W1, W Heating W1
RH, R, M, Vr, A Power R
C Common C
G, F or LOW Low Fan Speed G
MED Medium Fan Speed G2
HIGH High Fan Speed G3
Note: Be sure to seal any opening through the wall behind
the thermostat with reproof material to prevent improper
temperature sensing of the conditioned space.
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