Honeywell RTH8500 Owner's Manual page 7

Alternate Wiring (For Heat Pumps Only)
Leave metal jumper in place, connecting
If your old thermostat had both
qualified contractor for help.
If your old thermostat had separate
the terminal. If another wire is attached to the
C
contact a qualified contractor for help.
If your old thermostat had
qualified contractor for help.
If terminal is used,
L
5
contractor if there is no
If and
E Aux
6
piece of wire to connect them to each other.
2
3
3 5
5
6
4 6
,
Y1
terminal wire must be connected (contact a
C
wire).
C
terminals do not each have a wire connected, use a small
&
R Rc
and wires, stop now and contact a
V VR
and wires, attach the
O B
and wires, stop now and contact a
W1 W2
7
MCR28077
terminals.
wire to
B
terminal, stop now and
C