The Fan Mode informs the thermostat how to handle the fan. There are two options for fan configuration: a Fan Mode available to the installer through the menu system, and a fan override available as an option to the end user from the Fan icon on the home screen. See Customizing the home screen for information on enabling and disabling end-user controls.
The Fan Mode available to the installer depends on the fan type. The following options are provided for single- and variable-speed fans:
- On—For single-speed fan configurations, the fan is continuously on at a fixed speed. For variable-speed fan configurations, the fan is on at minimum speed when there is no heating or cooling demand. The fan speed increases or decreases proportionately with any variance in heating or cooling demand. The fan never stops in this mode.
- Auto—Fan cycles on demand with the thermostat entering cooling, heating, or dehumidification modes. The fan stays off if there is no demand of heating, cooling, or dehumidification.
- Smart—Fan cycles on demand with the thermostat entering cooling or heating modes during unoccupied periods but is continuously running during occupied and standby periods.
The following Fan Mode options are provided for multi-speed fans:
- Low—Fan is continuously on low.
- Medium—Fan is continuously on medium.
- High—Fan is continuously on high.
- Auto—Fan cycles on demand with the thermostat entering cooling, heating, or dehumidification modes. The fan stays off if there is no demand of heating, cooling, or dehumidification. The fan adjusts its speed according to the user configurable value of temperature differential from setpoint.
- Smart—Fan cycles on demand with the thermostat entering cooling or heating modes during unoccupied periods but is continuously running during occupied and standby periods.