Anything in particular you are curious about, regarding the VVT (Variable Air Volume Terminal) systems?
Some are controlled via "Stand-Alone" and "Brute-Force" methods, while most others are controlled via "Peer-To-Peer" Digital methods (LON or Local Operational Network).
Feel free to post questions in the new Voice / Data / Video forum, or in this thread.
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!