In an oil burner system, what should be done if the flame goes out?

• A. Ignite the burner manually
• B. Check the oil supply
• C. Utilize the stack switch to stop the burner
• D. Turn off the power supply

Answer: (C)

In an oil burner system, if the flame goes out, utilizing the stack switch to stop the burner is a critical safety procedure. The stack switch is designed to monitor the flue gases and will shut down the burner if it detects an unsafe condition, such as a loss of flame. This prevents the system from continuing to operate without a flame, which could lead to dangerous situations, including the buildup of harmful gases or an explosion.

Turning off the power supply can be a safety measure, but it doesn't directly address the immediate need to handle the flame-out condition—hence, relying on the stack switch is the preferred action to ensure immediate safety and system integrity.

Igniting the burner manually is not advisable because the cause of the flame outage must first be investigated to prevent repeating the failure. Checking the oil supply is also important, but the priority must be to ensure the system is safe before addressing fuel issues. Therefore, engaging the stack switch is the best step, as it is designed specifically to protect the system in such situations.