Honeywell RTH8500D Owner's Manual page 8

Step 4. Follow Special Instructions (Cont)
4. If you have only one C and/or C1 wire connected to your old
thermostat, connect this wire to C on the new thermostat.
Visit www.honeywell.com/yourhome or call Honeywell
Customer Care at 1-800-468-1502 before returning the
thermostat to the store.
G
C
69-1725-1
OLD THERMOSTAT
Y
CONNECT TO THE "C" ON THE
NEW THERMOSTAT
LETTER
W
DESIGNATION
SCREW
TERMINAL
WIRE
R
WIRE HOLE
8
M22223