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
Fan
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