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Thread: What is this?

  1. #1
    Join Date
    May 2009
    New Jersey

    Default What is this?

    This device was installed on a mid efficient heating system vent connector. Why would the installer install a device with opening on a system under positive pressure?

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  2. #2
    Join Date
    Mar 2007
    Plano, Texas

    Default Re: What is this?

    It's a resettable limit switch. Will turn off unit if flue gasses or heat exchanger gets too hot. I would bet the unit is not under positive pressure and has a air inducer fan that starts up but the vent is under negative pressure.

    My guess again.


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