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  1. #1
    Join Date
    Aug 2007
    Posts
    29

    homeowner question....

    I understand my gas forced air heating system to a reasonable degree thanks to this forum. It's in a L-shaped ranch house- and pretty centrally located in the basement. When it was installed 24 years ago, the HVAC guy suggested zoning, since one side of the house was bedrooms and bath- the other side living and kitchen and half bath. I passed on the zoning idea due to a severe lack of knowledge on my part. I was the one that wanted the furnace in the middle of the basement believing that a more central location would give me the best comfort level from room to room. Anyhow, my question: Since learning a bit about how important sizing (furnace/air/duct-work) is- how does a zoned system keep the correct amount of air-flow within/through the furnace when a "zone" is in use and another zone isn't? Wouldn't closing down the living room at night mess up the air going in and out of the furnace? How is this addressed? Sorry for the long post- just curious since zoning may be a consideration when the equipment is replaced. Hope this isn't too vague. Thanks.

  2. #2
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,765
    all depends on the system.

    some brands use a bypass damper to let excess air flow back into return.

    Lennox harmony system uses a v drive blower to slow down air flow depending on number of zones cooling. pretty sure some of the others do the same.

  3. #3
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,785
    Bypass damper,
    dump zone,
    and as above, some systems control fan speed.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  4. #4
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,429
    Quote Originally Posted by bluesy View Post

    ... gas forced air heating system to a reasonable degree thanks to this forum. It's in a L-shaped ranch house- and pretty centrally located in the basement.

    Anyhow, my question: Since learning a bit about how important sizing (furnace/air/duct-work) is- how does a zoned system keep the correct amount of air-flow within/through the furnace when a "zone" is in use and another zone isn't?

    How is this addressed?
    3 (or 4) zones can be set-up without completely closing off any zone. And/Or a small by-pass may also be used with a barometric damper.

    http://www.zonexsystems.com/digi3/digi3.htm
    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

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