Display format, Early Start, and sensor-mode switches on the TH115-AF-GA thermostat.
These switch settings apply to the TH115-AF-GA covered by the linked manual. Disconnect the heating circuit at the electrical panel before removing the faceplate. Loosen the bottom screw without removing it completely; the configuration switches are on the back of the faceplate.
- Switch 1: Up selects Fahrenheit and a 12-hour clock; Down selects Celsius and a 24-hour clock.
- Switch 2: Up enables Early Start; Down disables it. Early Start operates in Automatic mode and begins heating early enough to reach the Comfort temperature at the start of periods 1 and 3.
- Switch 3: Up selects Floor mode. Down selects Ambient/Floor mode when the external floor sensor is connected. Ambient-only operation is a distinct configuration without that sensor.
Ambient/Floor mode requires a working floor sensor to maintain floor-temperature limits. It is not a workaround for a damaged sensor. Have the installer choose the mode required for the heating system and flooring.
Reinstall the faceplate and tighten its screw before restoring power, then perform the GFCI test specified in the manual.
Sources
- Manufacturer instructions (publication 12984), PDF pp. 5 and 8–11; printed pp. 3 and 6–9.
