At what OHMS reading will the cad cell go into lock out?

The cad cell, or cadmium sulfide cell, is a critical component in the flame safeguard system of oil burners. It functions by monitoring the presence of a flame; when it detects a flame, it allows the burner to operate. The lockout occurs when the cad cell does not sense the flame, indicating that there may be an issue with the combustion process.

At a reading of 1601 OHMS, the cad cell enters a lockout state due to an insufficient flame signal. This OHMS level indicates that the resistance is too high for the cad cell to detect the presence of a flame reliably. In practical terms, this means that the flame is either not present or is too weak for the cad cell to register, prompting the safety feature to engage and prevent further operation of the burner, thus avoiding potentially hazardous situations.

Understanding these specific OHMS readings is crucial for oil burner maintenance and troubleshooting, as they guide technicians in diagnosing flame-related issues effectively. The other readings do not correspond to the typical lockout threshold for a cad cell, making this value significant in the safe operation of heating systems.