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  1. #1
    Join Date
    Mar 2007
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    New Mexico
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    Default What Does This Switch Do?

    Just out of curiosity, what does this switch turn on or off? I see it on my Trane rental furnaces, and at other forced air units. Are the P1 and P2 settings relevant to anything in residential use?

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    Jim Robinson
    New Mexico, USA

  2. #2
    Join Date
    Mar 2007
    Location
    Plano, Texas
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    4,170

    Default Re: What Does This Switch Do?

    Manual off switch.

    Jim Luttrall
    www.MrInspector.net
    Plano, Texas

  3. #3
    Join Date
    Mar 2007
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    New Mexico
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    Default Re: What Does This Switch Do?

    P1 and P2 are referring to the wire terminals, now that I look closer. So if I switch that to OFF, the gas should stop flowing regardless of the thermostat setting? Not planning on doing that on someone else's furnace, and not really sure why I'd need to on my own.

    Jim Robinson
    New Mexico, USA

  4. #4
    Join Date
    Mar 2007
    Location
    Near Philly, Pa.
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    1,643

    Cool Re: What Does This Switch Do?

    When setting up a furnace for the first time, you need to go through a process of firing the unit and adjusting the gas manifold pressures on hi and lo. Part of this process involves shutting off the gas while it is still running then switching the gas back on. It allows the board to 'learn' that particular unit with respect to the manifold pressure referenced to the vent pressure sensor tubing. Each unit is different thus the process.
    HTH

    Keep the fire in the fireplace.

  5. #5
    Join Date
    Oct 2010
    Location
    Southwest US
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    585

    Default Re: What Does This Switch Do?

    It's in the furnace, It says "ON" and "OFF". What do you think it does?


  6. #6
    Garry Blankenship's Avatar
    Garry Blankenship Guest

    Default Re: What Does This Switch Do?

    Quote Originally Posted by Benjamin Thompson View Post
    It's in the furnace, It says "ON" and "OFF". What do you think it does?
    The real challenging ones say NO and FFO.


  7. #7
    Join Date
    Mar 2007
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    Near Philly, Pa.
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    Talking Re: What Does This Switch Do?

    Quote Originally Posted by Garry Blankenship View Post
    The real challenging ones say NO and FFO.
    You mean like blondes at the auto supply house asking for a '710' cap?

    Keep the fire in the fireplace.

  8. #8
    Join Date
    Oct 2010
    Location
    Southwest US
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    585

    Default Re: What Does This Switch Do?

    Quote Originally Posted by Bob Harper View Post
    You mean like blondes at the auto supply house asking for a '710' cap?
    Took me a minute. I must be part blonde

    END GLOBAL WHINING

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