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Thread: Is my air pressure switch bad?

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    Is my air pressure switch bad?

    My minimax heater doesn't ignite. Air blower fan keeps blowing forever and service light is on. I take off rubber tubing and blow some air directly into air switch, then I put tubing back and it works for day or two. Here is the picture of the switch. What does .65"VF means? I couldn't find exact part number, but found RSS-495-11 model from Grainger.

    Anyone knows if this would work? Thank you
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    Butterfly's Avatar
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    May 2007
    South Carolina

    Re: Is my air pressure switch bad?

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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Is my air pressure switch bad?

    The RSS-495-11 will work. The difference is that the RSS-495-090 is a non-adjustable OEM switch set at .65" WC (water column).

    The RSS-495-11 is adjustable and comes from the factory set to .25" WC.
    To adjust it to .65" WC you need to turn the adjusting screw 2½ turns clockwise facing the screw. each turn of the screw = ~.16" WC
    Dave J. TFP Moderator
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    Re: Is my air pressure switch bad?

    You guys are great.Thank you very much.

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