EP2778423

The assembly i.e. circulating heating pump assembly, has a centrifugal pump (1) that is driven by an electric motor (7). An electronic speed controller or frequency converter is arranged for the motor, where the speed controller is arranged with an internal electronic controller. A signal input is provided for external activation of the motor. A switching unit or switch is arranged for switching of the internal electronic controller on an external speed control or for connecting the external speed control.