Honeywell RTH8500D User Manual

7 69-1725-1
Step 4. Follow Special Instructions
1. If you have two C and/or C1 wires connected to your old
thermostat, do not connect them to your new thermostat.
2. Disconnect the C and/or C1 wires. Make sure they do not touch
each other or any other wires.
3. Wrap the bare end of each C and/or C1 wire with electrical tape.
Y
C
C
R
W
OLD THERMOSTAT
WIRE HOLE
M22201
DO NOT CONNECT TO NEW
THERMOSTAT
WIRE
SCREW
TERMINAL
LETTER
DESIGNATION
G

Honeywell RTH8500D Specifications

General

Programmability	7-day programmable
Wi-Fi	No
Operating Modes	Heat, Cool, Auto, Off
Filter Change Alert	Yes
Backup Battery	Yes
Display	Touchscreen
Power Source	Battery or Hardwired
Compatibility	Gas, oil, electric, and heat pump systems
Stages	Up to 2 Heat/2 Cool
Fan Modes	Auto, On, Circulate
Temperature Range	40°F to 99°F (4°C to 37°C)
Hold Feature	Yes