Honeywell RTH7400 series Owner's Manual page 6

Alternate Wiring (Conventional Systems)
If labels do not match terminals, connect wires as shown here (see notes,
below).
Remove metal jumper connecting
and wires.
R Rc
If your old thermostat had both
Connect the
If your old thermostat had only 1
If your old thermostat had 2
electrical tape and do not connect them.
Alternate Wiring (Heat Pump)
If labels do not match letters on thermostat, see page 7.
HEAT PUMP
C
G
Y
O/B
RC
R
C
G
Y
W
RC
R
W2
Y2
wire to the terminal, and the
R Rc
C
SCREW
INSERT WIRES
THEN TIGHTEN SCREWS
LABELED WIRES
WIRE HOLE
C
3
G
Y
W
Rc
2
R
2
W2
Y2
MCR32160
and only if you must connect both
R Rc
and wires, remove metal jumper.
R RH
RH
or wire, connect it to the
C C1
or wires, wrap each separately with
C1
HEAT PUMP
Aux
E
L
MCR28104A
6
wire to the terminal.
R
terminal.
C
NOTE: If E and Aux
do not each have a
wire connected, use a
small piece of wire to
connect them to each
other.