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  1. #1
    Jon mackay's Avatar
    Jon mackay Guest

    Default 2 furnace units attached

    Has anyone heard of attaching 2 furnaces together and using them in sequence?

    Found the blower compartment sides removed and the furnaces are both activated for heating and cooling. I was thinking that this might throw off the air balance with the 2 blowers both on at once or some other issue. Seemed strange to me.

    Small commercial aplication.

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  2. #2
    Join Date
    Mar 2007
    Ridgewood, NJ

    Default Re: 2 furnace units attached

    Some manufacturer installation manuals have instructions on how to "twin" the furnaces.

  3. #3
    Join Date
    Mar 2007
    Chicago, IL

    Default Re: 2 furnace units attached

    Usually there is an OEM or after-market "twinning controller" installed, for example"

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    Michael Thomas
    Paragon Property Services Inc., Chicago IL

  4. #4
    Join Date
    Feb 2008
    Chicago IL

    Default Re: 2 furnace units attached

    'Twinning' 'was' a common method for oversized homes. Ruud and Rheem furnace boards had, and may still have, terminals specifically for twinning so the boards respond properly to the stat. You should see significantly larger ducts in a twinning configuration. If not recommend full evaluation.
    "The Code is not a ceiling to reach but a floor to work up from"


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