Honeywell RTH8500 Series - Page 9

7 33-00133ES—01
Installing your thermostat
Wiring (heat pump system only)
7B Wire Wi-Fi thermostat to your heat pump.
a Starting with the C Wire, match the sticky tag on the wire to the terminal labels.
You must have a C wire. See page 6.
b Loosen screw, insert wire on inside edge of
terminal, then tighten screw.
c Verify wire is firmly secured by gently pulling
on wire.
d Repeat steps a–c for all other wires.
e Push any excess wire back into the wall
opening after all wires are installed.
f Continue to page 9.
Note: If old thermostat has separate wires on AUX and E,
place both wires into the E/AUX terminal. If old thermostat
has wire on AUX with a jumper to E, place wire on E/AUX
terminal. No jumper is required.
Labels don’t match? See alternate
wiring key on page 8.
Note: The wiring for your
application might be different
than the wiring from above.
MCR33529
RC
R
O/B
Y
G
C
HEAT PUMP
L
E/AUX
K
R
O
G
Y
C
AUX
Y2
W2
K
Y2
W2
RC
R
W
Y
G
C
RC
R
W
Y
G
C
1
2
3
CONVENTIONAL
Metal J
umper
Alternate wiring (conventional system)
Use this if your wire labels don’t match the terminal labels.
Note: You must have
a C wire or equivalent.
See page 6.
Remove metal jumper connecting R and RC only if you must connect both
R and RC.
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.
Do not use K terminal. For future use.
Alternate wiring key (conventional system)
2
3
1