Gas Fitter Practice Test

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What is the function of an intermittent pilot?

A. Stay on after main burner shuts off
B. Stay on before and after main burner
C. Power up the thermocouple
D. Stay on during the main burner operation

The correct answer is: D. Stay on during the main burner operation

The function of an intermittent pilot is to provide ignition for the main burner when necessary. This type of pilot light typically ignites only when the main burner is called upon to operate, which means it stays on just during the main burner operation. Once the main burner has been ignited, the intermittent pilot may turn off until the system requires firing again. This approach has several advantages, such as efficiency and safety. By only being on when needed, it consumes less gas compared to permanent pilot lights. Additionally, it minimizes the risk of unburned gas escaping into the environment when the heating system is not actively in use. Regarding the other options, they do not accurately describe the behavior of the intermittent pilot. A pilot that stays on after the main burner shuts off would negate the energy-saving benefits, and one that remains on before and after burner operation would represent a constant pilot that is not intermittent. Similarly, while a pilot light does serve to ignite the gas, it is not directly responsible for powering up the thermocouple; that component functions primarily to ensure the gas flow is cut off in the event the pilot flame goes out.