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Thread: What is this and what does it do for my NG furnace?

  1. #1
    DIY Junior Member greaper's Avatar
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    Default What is this and what does it do for my NG furnace?

    I have a rental house and the other day my tenant called to tell me that there was no heat or AC. After further investigation I found that I had a bad EZ-TRAP float switch. I also noticed that there was a pair of wires just hanging that I thought was connected to this device that is on the exhaust flue. Can someone tell me what these pictures are of and what is it used for? I am also not sure if there is supposed to be two wires going to the small device in front or just one?

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  2. #2
    DIYer, not in the trades LLigetfa's Avatar
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    It is a barometric damper and a thermostatic switch that has been defeated.

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    DIY Junior Member greaper's Avatar
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    Thank you for the quick answer. Two questions. What is a barometric damper? How is the thermostatic switch supposed to wired? I assume that if the temperate rises to high at the switch that it is supposed to cut off the unit?

  4. #4
    DIYer, not in the trades LLigetfa's Avatar
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    I'm not a HVAC tech so I cannot cite code, but that thermostatic switch does not look like a code compliant setup. I think it was probably something that a well meaning DIY'er jury rigged. My guess is it was meant to detect a flue reversal (downdraft). I would use a CO detector to monitor for flue reversal.

    The barometric damper regulates the amount of draft by mixing in cooler room air whenever the draft is too strong.

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    Jack of all trades DonL's Avatar
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    Quote Originally Posted by greaper View Post
    I assume that if the temperate rises to high at the switch that it is supposed to cut off the unit?

    It is a 180 degree Presidential solution. And it does not belong there.
    Theory only works perfect in a vacuum.

    Cyber Security Protection for Windows C:\ > WWW.WinForce.Net

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    DIY Junior Member greaper's Avatar
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    Again, thank you for the replies. I guess based on that I will remove it and not worry about it.

  7. #7
    Jack of all trades DonL's Avatar
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    Quote Originally Posted by greaper View Post
    Again, thank you for the replies. I guess based on that I will remove it and not worry about it.

    Did you find the original problem with it ? Why it was not working.
    Theory only works perfect in a vacuum.

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  8. #8
    DIY Junior Member greaper's Avatar
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    Yep, it was the EZ-TRAP float.

  9. #9
    DIY Junior Member Failure2Comply's Avatar
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    Someone installed an warp disc limit (180F "Flue Draft Spillage") switch on your barometric relief damper. They must have had a venting issue and band-aided the problem.

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