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HVAC D-2 License Practice Test
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The cad cell on an oil burner detects what?
Pressure
Light
Noise
Flame
Reveal Answer
Correct Answer:
Flame
Explanation:
The cad cell is a flame detector. It works as a photoelectric sensor that responds to the light emitted by the flame. When a flame is present, the light lowers the cadmium sulfide cell’s resistance and sends a signal to the burner control to keep the fuel flowing. If the flame goes out, the signal changes and the control shuts off the fuel to prevent unburned oil. It’s not measuring pressure or noise, and it’s not reacting to general ambient light—it’s specifically detecting the flame’s light.
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