What part of the oil burner system closes contacts when the temperature is reached?

The stack switch is an important component in an oil burner system that plays a critical role in safety and control. It functions by monitoring the temperature of the flue gases within the system. When the burner is operational, it generates heat, and the stack switch detects when a specific temperature is reached, which indicates that the combustion process is proceeding correctly.

Once the predetermined temperature level is achieved, the stack switch closes its contacts. This closure can serve various purposes, such as signaling the burner to shut down if dangerous conditions arise or ensuring that the system operates within safe limits. By doing so, it helps prevent overheating and potential hazards associated with excessive temperatures.

This functionality is essential for maintaining not just the efficiency of the heating process, but also the safety of the entire oil burner system, reinforcing the significance of the stack switch within the overall operation of HVAC systems.