Which factor does NOT affect cad cell performance?

The performance of a cad cell is primarily influenced by factors that directly impact its ability to detect the presence of flame. Lighting conditions play a crucial role, as ambient light can interfere with the sensor’s ability to differentiate between flame light and other light sources. The distance from the flame is also significant because it can affect the intensity of the light the cad cell receives; if it is too far away, the sensor may fail to detect the flame. Additionally, soiling of the lens is critical, as any dirt or residue can obstruct the light from reaching the sensor, compromising its functionality.

The thermostat setting, on the other hand, does not have a direct impact on the cad cell's performance. The setting may influence the overall operation of the heating system, but it does not affect how well the cad cell can detect a flame. The cad cell's effectiveness is tied to its ability to receive and interpret light signals from the flame rather than the conditions set by the thermostat. Thus, the thermostat setting is the factor that does not influence cad cell performance.