A stack switch is a heat-actuated control that uses the stack temperature to indicate that the oil burner has or has not established a flame.

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Quizplus · Accepted Answer

A stack switch, also known as a stack relay or stack control, is indeed a heat-actuated control device that monitors the stack (chimney) temperature to determine whether an oil burner has successfully ignited. If the burner fails to ignite, the stack switch will shut off the fuel supply to prevent unburned fuel from accumulating, enhancing safety and efficiency.

A Stack Switch Is a Heat-Actuated Control That Uses the Stack