Honeywell RTH8500 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.
Wiring (Heat Pump)
If labels do not match letters on thermostat, see page 7.
THEN TIGHTEN SCREWS
LABELED WIRES
HEAT PUMP
WIRE HOLE
L
E
AUX
RC
R
W
Y
G
C
Y2
W2
wire to the terminal, and the
R Rc
C
SCREW
INSERT WIRES
Rc
2
R
W
Y
G
C
Y2
W2
MCR28076
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
NOTE: If E and Aux do not
HEAT PUMP
each have a wire connected,
use a small piece of wire to
RC
connect them to each other.
R
O/B
Y
G
C
M27516
6
2
3
wire to the terminal.
R
terminal.
C