If the terminal designations on your old
thermostat do not match those on the
new thermostat, refer to the chart below,
or the wiring diagrams that follow.
STEP #3
WIRE CONNECTIONS
Page 4
4-PIPE SYSTEMS
Wire from the
old thermostat
terminal marked
Install on the
new thermostat
terminal marked
Function
Cooling
Heating
Power
Common
Low
Fan Speed
Medium
Fan Speed
High
Fan Speed
Y1
W1
R
C
G
G2
G3
Y1, Y or C
W1, W or H
Rh, R, M, Vr, A
C
G, F or LOW
MED
HIGH
Note: Be sure to seal any opening through
the wall behind the thermostat to prevent
improper temperature sensing of the
conditioned space.
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