What is the primary function of the stack switch?

The stack switch serves a critical safety function by shutting down the burner during unsafe conditions. It is designed to monitor the temperature in the exhaust stack, ensuring that it does not exceed a specified limit. If the temperature rises beyond this limit, which could indicate issues such as poor combustion or a blockage in the flue, the stack switch will activate and signal the burner to shut down. This helps prevent dangerous situations that could arise from overheating or the release of harmful gases.

Understanding the stack switch's role in safety is crucial for oil burner operators, as it directly impacts the safe operation of the heating system. While other components may manage fuel flow or air supply, the stack switch is specifically focused on monitoring conditions that protect both the equipment and the occupants of the building from potential hazards.