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Thread: What is it

  1. #1
    Join Date
    May 2009
    Location
    New Jersey
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    81

    Default What is it

    Found this today on a 9 year old Trane 80, which replaced a natural draft oil fired system. Can seem to find anything on the internet.

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  2. #2
    Join Date
    Mar 2007
    Location
    Oregon
    Posts
    2,365

    Default Re: What is it

    Is it Normal for furnace to reach high-limit switch often? - Page 4 - HVAC-Talk: Heating, Air & Refrigeration Discussion

    The only thing online I could find is in post #45 of the above thread on an hvac board.

    It looks like just an old limit switch from a past appliance. I'm not sure as to why it would still be there. I'd think the newer furnace has its own limit switches.


  3. #3
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,248

    Default Re: What is it

    Quote Originally Posted by Matt Fellman View Post
    Is it Normal for furnace to reach high-limit switch often? - Page 4 - HVAC-Talk: Heating, Air & Refrigeration Discussion

    The only thing online I could find is in post #45 of the above thread on an hvac board.

    It looks like just an old limit switch from a past appliance. I'm not sure as to why it would still be there. I'd think the newer furnace has its own limit switches.
    And this one: Trane XR90 - diagnostic LED flashing 4 times - http://www.hvacmechanic.com/ Forums 5th post up from the bottom (7th post down from top).

    Does not add anything useful, though.

    Jerry Peck, Construction / Litigation Consultant
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  4. #4
    Join Date
    Feb 2008
    Location
    Chicago IL
    Posts
    1,984

    Default Re: What is it

    Looks like a flue damper with a limit setting. I would say this might work on an old style regular venting unit to keep heat from going out the flue or cold coming down the flue.
    The furnace is probably short cycling because the limit is messing with the pressure switch. Your furnace is power vented, see what look to be two orange rubber tubes? Those go to the pressure switch. Try jumping the pressure switch for a couple cycles and see if it still short cycles. You'll probably have to un-jump between cycles, some units will lock out otherwise. Don't remember Trane sequence, don't use a lot around here.

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  5. #5
    Join Date
    Feb 2009
    Location
    Indiana
    Posts
    37

    Default Re: What is it

    It's a masonry chimney adapter. They are often used to meet the requirements for alternate vent design according to the NFGC. They allow a constant draft to be achieved. It has nothing to do with a power venter. The two orange wires are connected to a limit switch that wires into the limit circuit of the furnace. It is there to detect backdraft or a blocked vent.


  6. #6
    Join Date
    Mar 2007
    Location
    Near Philly, Pa.
    Posts
    1,643

    Cool masonry chimney adapter

    Jerry nailed it.
    Here is the Carrier version: http://www.xpedio.carrier.com/idc/gr...k-kgaca-01.pdf

    It is basically a draft hood with spill switch designed to minimize flue gas condensation.
    HTH,
    Bob

    Keep the fire in the fireplace.

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