What is the function of a stack switch in an oil burner system?

• A. Enhance fuel efficiency
• B. Regulate oil flow
• C. Stop the burner when the flame goes out
• D. Control air intake

Answer: (C)

The function of a stack switch in an oil burner system is to stop the burner when the flame goes out. This safety device is designed to monitor the presence of the flame within the combustion chamber. If the flame goes out for any reason—such as a draft or fuel interruption—the stack switch detects this condition and shuts down the burner to prevent the release of unburned fuel into the system, which could create a hazardous situation.

By implementing this safety feature, operational risks are minimized, ensuring that the heating system functions safely and effectively. The stack switch is an essential component that supports overall system integrity and protects both the equipment and the environment from potentially dangerous situations.