This device was specially developed for fast, clear and convenient wiring of 230 VAC individual room temperature controllers with the associated valve actuators for permanent installation. The heating/cooling changeover takes place via a central contact. Heating controllers with changeover contact can be connected as controllers. Significant time and cost savings thanks to the convenient wiring using screwless spring terminals and the ingeniously quick and clean installation in the heating circuit distributor using the optional magnetic feet. A master-slave time zone can be created by using a clock controller. The time zone can also be switched over to the ECO function via an external switching contact at terminal U.