The T612 Thermostat Controller user interface consists of five keys on the front cover (Figure 1). The function of each key is as follows:
- Use the MODE key to toggle among the system modes available, as defined by selecting the appropriate operation sequence in the Installer Configuration Menu (Off, Heat, Cool, Auto).
Note: If the automatic changeover function (auto function) is enabled in the sequence of operation (SeqOpera), then automatic changeover heating or cooling demand overrides the mode when MODE = off.
- Use the FAN key to toggle among the fan modes available, as defined by selecting the appropriate fan menu options defined in the Installer Configuration Menu (Low, Med, High, Auto).
- Use the °C/°F key to change the temperature scale to either Celsius or Fahrenheit and allow access to the Installer Configuration Menu. See the Configuring the T612DFH-4 and T612DFH-4+PIR Thermostat Controllers section.
- Use the UP/DOWN arrow keys to change the configuration parameters and to activate a setpoint adjustment.