The Iowa Energy Center at Iowa State University has a good, vendor-neutral website that contains a tutorial on DDC, plus some boxes-and-wires pictures of various vendors' control systems. Their website is http://www.ddc-online.org/
The American Society of Heating, Refrigerating and Air-conditioning Engineers is the industry association for the consulting engineers who design heating and cooling systems for buildings. Their website is http://www.ashrae.org/
Best,
B.O. Jan. 19, 2007
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Robert Old, System Architecture, [email protected]
Siemens Building Technologies, Inc., Building Automation
1000 Deerfield Pkwy., Buffalo Grove, IL 60089-4513 USA
Phone: +1(847)941-5623, Fax: +1(866)699-0126