What is the exact procedure for recalibrating a BJ thermostat?

Recalibrating a BJ thermostat involves ensuring that it responds accurately to temperature changes, which is critical for maintaining proper equipment performance. Placing a thermometer over the sensor bulb is the correct procedure for recalibrating a thermostat because it allows for direct measurement of the temperature at the location where the thermostat is sensing heat. By adjusting the thermostat based on the thermometer reading, you can accurately align the thermostat's calibration with the actual temperature being measured.

Establishing a direct connection between the thermometer and the sensor bulb is important, as this provides a real-time comparison between the thermostat setting and the actual temperature. Adjustments made using this method result in precise calibration, ensuring that the thermostat operates effectively within the desired temperature range.

The other options do not facilitate proper recalibration as effectively. For instance, recording the temperature when the bypass flame is set does not directly address the calibration of the thermostat itself. Setting the thermostat to its highest setting does not provide any feedback for recalibration and could lead to misuse or potential overheating. Finally, removing the thermostat and inspecting it for damage, while important for maintenance, does not contribute to the recalibration process.