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power vent flame sense rod

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Joe H
Joe H Posts: 15
in THE MAIN WALL
the flame sense rod on a power vented water heater by using heat from the burner or current flow?

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  • Steve Whitbeck
    Steve Whitbeck Posts: 669


    If it is a true flame rod then it is always DC current flow. A flame rod is just a steel rod inserted into the burner or the pilot flame. An A/C voltage is applied to the rod and the flame rectifies the A/C voltage to D/C.
    If the amount of rectification is above the minimum for the ignition control then the flame stays on. If not off it goes.
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