Honeywell TH8320U VisionPro Thermostat
The TH8320 Thermostat is a Touchsreen, 7-Day Programmable (or non-programmable), multi-stage thermostat.
The TH8320 Thermostats provide temperature control for gas, oil, electric and heat pumps for up to 3 heat, 2 cool systems including dual fuel operation.
Batteries:
- Three replaceable AAA alkaline batteries: Power thermostats when 24 Vac common is not used.
- Non-replaceable lithium battery with ten-year life under normal use to hold calendar and time settings.
- Alkaline batteries keep calendar and time after lithium battery is no longer functional.
System and Fan Settings
System: The System key selections vary based on your heating and/or cooling system type.
- Heat - Thermostat controls the heating system.
- Off - Both heating and cooling systems are off.
- Cool - Thermostat controls the cooling system.
- Auto - Thermostat automatically changes between heating and cooling operation, depending on indoor temperature.
- Em. Heat - Emergency heat cycles to maintain temperature. Compressor is locked out (used only for 2H/1C or 3H/2C heat pump systems) and auxiliary heat turns on as second stage if needed.
Fan: The Fan key selections vary based on the heating and/or cooling system type.
- On - Fan runs continuously. Use this setting for improved air circulation or for more efficient central air cleaning.
- Auto - fan follows the fan program schedule.
- Circ - fan runs randomly approximately 35% of the time. Use this setting for improved air circulation or for more efficient central air cleaning when you do not want the fan running continuously.