Honeywell RTH8500 Series - Home Screen Quick Reference; Preset Energy-Saving Schedules

69-2219EF—03 2
Remove old thermostat but leave wallplate with
wires attached.
2
Remove Old Thermostat
M28099
Is there a sealed tube containing
mercury? If so, see back cover
for proper disposal instructions.
Leave wallplate
in place
Old thermostat
Cover