What is mandated to be installed along with an automatic stack damper?

An automatic stack damper is designed to control the flue gas flow by opening and closing based on certain conditions. One of the key safety features that must be included alongside an automatic stack damper is a proving switch. This device ensures that the damper is in the correct position before allowing the burner to operate. It acts as a safety interlock by confirming that the damper is open during operation, thereby ensuring that exhaust gases can exit the system safely. If the damper is closed or not functioning properly, the proving switch will interrupt the burner operation, preventing dangerous situations such as backdraft or carbon monoxide buildup.

The inclusion of a proving switch is crucial for ensuring the safe and efficient operation of oil heat systems that utilize automatic stack dampers, thereby protecting both the equipment and the occupants of the building.