I'm trying to help a friend rewire a zone damper system. He currently has two tstats with a switch in the basement hall to select either heating/cooling or fan. Very hokey system. The upstairs tstat is like a t87. Basically has temp setting only. Downstairs is a conventional electronic tstat. But you have to set the switch in the basement hall on either heat or cool. He wants to be able to control the damper in the ductwork directly from the tstats thus eliminating the hallway switch. I can't find any wiring literature on honeywell site or web. Any ideas???