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How to Adjust the Draft on an Oil-Fired Heater

The draft adjustment on an oil -fired heater regulates the flow of combustion air. The damper widens the space inside the heater chamber so oxygen reaches the burning oil. Proper adjustment helps the oil heater operate at peak efficiency. Scale markings on the side of the draft adjustment knob serve as a guide to setting the damper.

Things You'll Need

  • Pliers
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Instructions

    • 1

      Turn on the heater and adjust the thermostat control higher until the burner switches on.

    • 2

      Loosen the draft knob on the heater vent, twisting counterclockwise. Use pliers, if necessary. The knob can become stuck over time.

    • 3

      Push the knob forward to open the damper inside the draft vent. This expands the flow of air. Follow the measurement scale on the draft adjustment to match the draft setting for your brand of oil-fired heater. This information is in the owner's manual, or you can contact the manufacturer or HVAC repair company.

    • 4

      Twist the knob clockwise to secure the new draft setting.

    • 5

      Unscrew the adjustment knob and slide it in the opposite direction to decrease combustion air flowing through the damper. Screw the knob tight to lock the new setting.

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