Hello there everyone. Just recently got a job that would entail operating a devireg 550 thermostats. These thermostats are connected together using a twocore bus. I was going to use a pacs system to control these devices and hope for the best. I wonder if anyone out there has had experience with this type of thermostat. Also darren is your code for the control of thermo stats relivent to this type of thermostat i can only but try i suppose. :confused: :confused: