Honeywell TH8321 Product Data page 56

VISIONPRO® 8000 SMART THERMOSTAT
Fossil Fuel Backup Heat (Backup Heat
NOT Allowed to Run with Heat Pump)
HEAT MODE
The thermostat turns on Backup Heat only when the indoor
temperature drops to the selected Backup Heat Droop
setting or the Backup Heat Upstage Timer expires
(whichever occurs first). Geothermal Forced Air Heat turns
off when the Backup Heat turns on. Geothermal Radiant
Heat stays on when the Backup Heat turns on.
EMERGENCY HEAT MODE
The thermostat turns on the Backup Heat to maintain the
desired temperature setting. Geothermal Radiant Heat and
Geothermal Forced Air Heat are not used.
Set Up Geothermal Radiant Heat
1. Select Geothermal Radiant Heat as shown in
Fig. 108.
Fig. 108.
2. Select the number of Radiant Heat Stages. See
Fig. 109.
Fig. 109.
3. Select a Geothermal Forced Air Option. For example,
if Geothermal Forced Air is used for both heating and
cooling, select the "Heating and Cooling" option. See
Fig. 110. Other options are "None" (Geothermal
Forced Air is not used) and "Cool Only" (Geothermal
Forced Air is only used for cooling). See Fig. 110.
6. Select the Backup Heat Type. See Fig. 113.
33-00096—04
4. Select the Reversing Valve. See Fig. 111.
5. Select the number of Compressor and Backup Heat
Stages. See Fig. 112.
56
Fig. 110.
Fig. 111.
Fig. 112.