What is the normal ohms range for a cad cell during burner operation?

The normal ohms range for a cad cell during burner operation typically falls between 300 to 1000 ohms, depending on the specific design and application. In oil heating systems, the cad cell, or cadmium sulfide photoresistor, senses the presence of flame. When the burner is operating correctly, the resistance of the cad cell is relatively low, indicating that it is detecting sufficient light from the flame.

The chosen range suggests that it is reflecting an appropriate level of sensitivity and reaction to the flame, thus ensuring the burner remains operational. A lower resistance signifies that the cad cell is functioning optimally, allowing for better control of the burner cycle. This is vital for both efficiency and safety in oil burner operation.

The ranges provided in the other options do not align with typical cad cell resistance values. Understanding this range is crucial for technicians to diagnose and troubleshoot burner issues effectively.