For controlling a heating or cooling circuit. The device has 2 channels, each with two electronic outputs for controlling the 3-way mixer valve (3-point) of a heating or cooling circuit. The device also has a relay output (5 A) for switching the circulation pump. The status of the pump can be monitored via 3 binary signal inputs (via potential-free contacts) and this feedback can be included in the control of the pump. The flow and return temperatures are measured and used to calculate the valve control value by the integrated controller. The setpoint is received via the KNX bus. By bundling channels, it is possible to control systems with double pumps. The ABB i-bus tool can be used for extended diagnostic functions and improved commissioning.