Honeywell TH8320U Overview

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.