This single stage thermostat is used to control the ambient air temperature, the slab temperature or both.
In the “A” mode, the ‘stat controls at and displays only the ambient air temperature
In the “F” mode, the thermostat controls and displays the temperature of the heated slab. FLR is displayed above the temperature in this mode
In the “AF” mode the device controls to and maintains the ambient room temperature as well as maintaining the desired floor temperature