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Thread: What is this?

  1. 06-01-2018, 03:32 PM #1
    Richard Roshak's Avatar
    Richard Roshak
    Richard Roshak is offline Member
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    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. 06-01-2018, 04:05 PM #2
    Gary Burnett's Avatar
    Gary Burnett
    Gary Burnett is offline Member
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    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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