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Thread: Derating furnace - adjust pressure or change orifice?

  1. 06-25-2009, 01:44 PM #1
    garya505
    garya505 is offline Regular Guest
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    Derating furnace - adjust pressure or change orifice?

    For derating a furnace, what iss the correct method - adjusting pressure or changing the orifices, or both?

    I'm at 5000ft. I suspect my furnace wasn't derated when installed. Would I save money if I had someone adjust it?
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  3. 06-25-2009, 02:31 PM #2
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    motoguy128
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    The installation instruction of all furnaces give details on how to adjust for higher altitudes. You should have het installer return and set-up te unit correctly... or pay a pro to do it.

    Incorrect airflow can cause improper burn resulting in higher CO levels, soot, and lower efficiency.
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  4. 06-25-2009, 09:05 PM #3
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    ACFIXR
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    Quote Originally Posted by garya505 View Post
    For derating a furnace, what iss the correct method - adjusting pressure or changing the orifices, or both?

    I'm at 5000ft. I suspect my furnace wasn't derated when installed. Would I save money if I had someone adjust it?
    Both need to be done by a pro.
    "I aint going to spit on 30 years of my life" Monte Walsh

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