Which component in a heating system is critical for flame detection?

The cad cell is essential for flame detection in a heating system because it acts as a photoelectric light sensor. Its primary function is to monitor the presence of a flame during the combustion process. When the burner ignites, the light emitted by the flame is detected by the cad cell, which generates a signal indicating that the flame is present. If the flame goes out for any reason, the cad cell will not receive the necessary light, causing it to shut down the burner to prevent unburnt oil from accumulating, which could lead to hazardous situations such as an explosion or carbon buildup.

Flame detection is a crucial safety feature in heating systems, as it ensures that combustion is taking place correctly and safely. While other system components like the thermostat regulate temperature, the ignition transformer provides the spark to ignite the fuel, and the flame sensor also detects the flame, the cad cell specifically plays a pivotal role in ensuring that the flame is stable and present throughout the operation of the burner. This factor is fundamental for maintaining safe and efficient operation of the heating system.