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Thread: zone dampering

  1. #1
    Join Date
    Jul 2006
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    Hmm zone dampering

    Does anyone have any experience in zone dampering systems on big rooftop units. I understand there are types available with adjustable static settings depending on your desires. I have a rather large rooftop with only 2 major ducts I want to put automatic dampers in

  2. #2
    Join Date
    Mar 2005
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    Why do you want to put automatic dampers in these two zones? Temperature control, different schedules for different zones, other?
    Do you have a vfd or inlet vanes on this RTU's supply fan? Is there more than one fan, supply, return and exhaust/relief?
    If you put in zone dampers and you do not have a vfd or vanes you will need to add a vfd and a static pressure transducer or add a bypass damper with a static pressure transducer. Is this a DX system and does the unit have heat and if it does what type? You need to be careful and take various measures if this is a large RTU when adding zone dampers as you could over pressurize the duct work and blow it apart. I would recommend contacting a local HVAC company that does commercial controls to assist you with what you are wanting to do.
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  3. #3
    Join Date
    Dec 2006
    Location
    Washington, DC
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    /agree with Crab, contact someone who installs these.

    Going with a zoning system like Tranes VariTrac or Carrier's 3V is to your benefit. The systems have alot of settings in the programming to protect the equipment & duct.

  4. #4
    Join Date
    Aug 2006
    Location
    NY
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    230
    Quote Originally Posted by mechanaman View Post
    Does anyone have any experience in zone dampering systems on big rooftop units. I understand there are types available with adjustable static settings depending on your desires. I have a rather large rooftop with only 2 major ducts I want to put automatic dampers in
    Mechanaman,

    Can you be more specific in regards to the application. Tonnage, load, sq/ft of the 2 zones to be, the size of the 2 ducts, ....plenum ceiling?

    Why do you wish to split the load. Is it a landlord thing, splitting suites, or temperatures uneven? Averaging controls can rectify some issues.

    I have quite a few years experience in zoning retrofits, as well as new VAV design/build. I may be able to give some simple input with a little more data.
    Thank you for reading, and have a nice day

  5. #5
    Join Date
    Mar 2007
    Location
    Midwest
    Posts
    19

    Carrier 3V

    Here is a link for the Carrier 3V product databook which you will find helpful.

    The new Carrier 3V is pretty slick and easy to setup.

    There is also a demo on the Carrier website which runs through the whole setup.

    http://www.xpedio.carrier.com/idc/gr...t/33zc-1pd.pdf

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