I am involved with a Trane Summit system and three of the AC systems on the network are DX VAV systems. The VAV AHU systems are set up to control to a supply air temperature and the VAV's control to their zone temperatures. The problem is overcooling of spaces. As the VAV boxes satisfy and close to their minimums the AHU continues to pump out its 55 degree or 60 degree air (depending on outside air temperature) and overcools the spaces. I thought the VAS settings were to prevent this by shutting off the air handler but this doesn't seem to work as I thought it should. Anyone with experience in this? Thank you.