What should you do after adjusting the shaft plate on a FD thermostat?

After adjusting the shaft plate on a FD (Flame Detector) thermostat, it is essential to retighten the adjustment screws and reinstall the knob. This step is crucial for ensuring that the adjustments made are secure and will hold under operational conditions. If the screws are not properly tightened, there is a risk that the settings may loosen over time, leading to inaccurate temperature readings and potentially unsafe operating conditions.

Reinstalling the knob is also important as it allows for the safe and convenient adjustment of the thermostat in the future. It protects the thermostat's internal components and provides a clear indication of the set temperature. Properly securing the components after adjustment helps maintain the reliability and longevity of the thermostat.

While recalibrating the temperature might seem like a logical step, it is only necessary if the thermostat requires it after adjustments, while immediately securing the adjustment is a more immediate priority. Leaving the unit as is could result in malfunction due to the unsecured settings. Therefore, securing adjustments and reinstalling components is the best practice for ensuring consistent and safe operation of the thermostat.