About Your New Thermostat - Honeywell RTH8500 Owner's Manual

Function Description
0500 Furnace Filter Change Reminder
0530 Smart Response® Technology
0640 Clock Format

About your new thermostat

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.
7-day program schedules maximize comfort and economy.
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Armchair programming: Just pull thermostat from the wall to set schedules.
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One-touch temp control overrides program schedule at any time.
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Precise comfort control keeps temperature within 1°F of the level you set.
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Change/check reminders let you know when to replace filters and batteries.
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Large touchscreen display with backlight is easy to read—even in the dark.
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Setting
Press the s or t button to change the setting.
0 Off (no reminder)
1 Reminder in about 1 month
2 Reminder in about 3 months
3 Reminder in about 6 months
4 Reminder in about 9 months
5 Reminder in about 1 year
6 Reminder in about 3 years
1 On
0 Off
12 12-hour clock (i.e., "3:30 pm")
24 24-hour clock (i.e., "15:30")
12