RTH7400/RTH7500
If labels do not match terminals, connect
wires as shown here (see notes, below).
Remove metal jumper connecting
R
and
Rc
only if you must connect both
R
and
Rc
wires.
If your old thermostat had both
R
and
RH
wires, remove metal jumper. Connect
the
R
wire to the
Rc
terminal, and the
RH
wire to the
R
terminal.
If your old thermostat had only 1
C
or
C1
wire, connect it to the
C
terminal. If
your old thermostat had 2
C
or
C1
wires,
wrap each separately with electrical tape
and do not connect them.
Alternate wiring (conventional systems)
RC
R
W
Y
G
C
Y2
W2
Rc
R
W
Y
G
C
Y2
W2
2
3
2