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Thread: air fuel ratio

  1. #1
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    air fuel ratio

    air fuel ratio question.

    On my oil heater adjusting the air band and shutter I see the flame getting larger and larger as i decrease the air. Set to the smallest air intake the flame is the largest. I never see smoke.

    I did a complete tune up last season and noticed this condition, then and again this season.

    Your thoughts?

    thanks,
    paul

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    between 0 and 1 on smoke spot test. 475 F flue temp before barometric damper.

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