HVAC Controllers

How many HVAC Controllers can be programmed to a link in QS

0 Im pretty sure they go on an RF link I have never used them since all of my HVAC integration is 3rd party stuff like Tekmar or Carrier. However I know there is a limit of 5 wireless temp sensors per RF Link . Someone with more knowledge would have to answer if the wall stations have a limit per link if used rather then the wireless temp sensor