Honeywell RTH8500D Owner's Manual page 9

Step 4. Follow Special Instructions (Cont)
5. If you find any wires not connected to your old thermostat, do
not connect them to your new thermostat.
6. Wrap the end of the wires that are not connected with electrical
tape.
OLD THERMOSTAT
Y
G
R
C
LETTER DESIGNATION
W
SCREW TERMINAL
WIRE
WIRE HOLE
R
WIRES NOT CONNECTED –
DO NOT CONNECT TO
NEW THERMOSTAT
9
M22040
69-1725-1