Honeywell RTH8500 Operating Manual
Congratulations! You’ve just purchased the world’s most advanced, easy-to-use thermostat. It has been designed to give you many years of reliable service and touchscreen climate control.
Honeywell RTH8500 Features
- 7-day program schedules maximize comfort and economy.
- Armchair programming: Just pull thermostat from the wall to set schedules.
- One-touch temp control overrides program schedule at any time.
- Precise comfort control keeps temperature within 1°F of the level you set.
- Change/check reminders let you know when to replace filters and batteries.
- Large touchscreen display with backlight is easy to read—even in the dark.
Honeywell RTH8500 Table of Content
About your new thermostat
Thermostat features...................................2
Programming at a glance...........................3
Quick reference to controls........................4
Quick reference to status display................5
Programming & Operation
Clock setting............................................6
Fan setting...............................................7
System setting.........................................8
Using program schedules..........................9
Program schedule overrides......................12
Vacation hold..........................................14
Screen cleaning......................................15
Furnace filter reminder.............................16
Special features......................................17
Appendices
Battery replacement/
Customer assistance..............................18
In case of difficulty..................................19
Limited warranty.....................................21
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