Five wires connected to the old thermostat
Your new thermostat has a factory-installed metal jumper between the R and Rc terminals (Fig. 15). Remove the jumper
before wiring the R and Rc terminals.
JUMPER (FACTORY-
Fig. 15
INSTALLED). REMOVE
IF 5-WIRE SYSTEM
c
R
R
G
Y
W
M20127
Old thermostat terminals that do not match new thermostat terminals
Use the table below to wire the new thermostat.
Old thermostat
Connect to new
terminal
thermostat terminal
R, RH, 4, V
R*
Rc, R
Rc*
W, W
, H
W
1
Y, Y
, M
Y
1
G, F
G
O
Do not continue
installation
B
C, X, B
Do not connect
W
, H
Do not continue
2
2
installation.
Y
2
*Remove factory-installed jumper between R and Rc terminals in 5-wire systems.
10
INSTALLATION
Description
Power
Power for cooling
Heat
Cooling
Fan
Changeover in cool (O terminal) or changeover in heat (B terminal).
You have a single stage heat pump or zoning system. See page 2 for an
alternate thermostat model.
Transformer common.
Second stage heat (W
, H
2
You have a multistage heating/cooling system. See page 2 for an alternate
thermostat model.
) or second stage cooling (Y
2
).
2
69-0653-6