Honeywell TH8000 Series Owner's Manual page 32

Advanced Heat Pump Features (Select Models)
If you have a heat pump heating system, your thermostat can use some special features when used
with an Outdoor Temperature Sensor, such as compressor and/or backup heat lockout based on
outside temperature. For example, if your backup heat does not turn on above a designated outside
temperature, your system uses an advanced heat pump feature.
Setting Calendar
This thermostat is designed to automatically keep current time and day in memory for up to ten
years, under normal use, once the calendar is set. There are two ways to set the calendar for this
thermostat:
SETTING CALENDAR AFTER THERMOSTAT IS ALREADY FUNCTIONING
See steps 1 through 4, in the Advanced Settings section, to set year, month and day.
SETTING CALENDAR WHEN THERMOSTAT IS FIRST POWERED
When this thermostat is first powered, the display is ready to set the calendar.
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