11 69-1638—1
Old thermostat terminals that do not match new thermostat terminals
Use the table below to wire the new thermostat.
*Remove factory-installed jumper between R and Rc terminals in 5-wire systems.
Old Thermostat
Terminal
Connect to New
Thermostat
Terminal Description
R, RH, 4, V R* Power
Rc, R Rc* Power for cooling
W, W
1
, H W Heat
Y, Y
1
, M Y Cooling
G, F G Fa n
O Do not continue
installation
Changeover in cool (O terminal) or changeover in heat (B terminal).
You have a single-stage heat pump or zoning system. Select an alternate
thermostat model.
B
C, X, B Do not connect Transformer common.
W
2
, H
2
Do not continue
installation.
Second stage heat (W
2
, H
2
) or second stage cooling (Y
2
).
You have a multistage heating/cooling system. Select an alternate
thermostat model.
Y
2
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