This Velbus temperature controller is the heart of your heating or air-conditioning system. It works together with at least one VMB1TS Velbus temperature sensors. The controller can monitor and adjust the temperature from up to 32 sensors. A group of temperature sensors can be configured as temperature zones (e.g. Upstairs, Downstairs..). When the desired temperature is achieved a Velbus relay contact will operate the heating/air-conditioning units zone valves or pump.