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
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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/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.
Originally Posted by 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
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.