Abstract: The invention relates in a first aspect to method of venting air out of a closed fluid system comprising a number of inter connected pipes configured for flow of a fluid, a variable speed pump configured for controlling the volume flow of fluid in said fluid system and an air venting device configured to let air out from the fluid system, the method comprising operating said pump in at least three phases.

Abstract: A method of balancing a heating system with a flow system, including a supply flow line (60) and a return flow line (70), a heat source (55) and a pump (10) hydraulic lines (L1-Ln), some having a heating element (H1-Hn) with a balancing valve (V1-Vn). The method includes: carrying out one or more measurements by opening one hydraulic line only and determining a flow rate through the pump and a pressure difference across the pump, establishing a hydraulic model based on the determined flow rate and pressure difference from at least two measurements from step, and at least one additional measurement for at least two hydraulic lines, specifying a desired flow rate for each of the hydraulic lines, and adjusting one or more of the dedicated balancing valves in order to meet the desired flow rate for each of the hydraulic lines by using the hydraulic model.

Abstract: A circulation pump assembly (2) includes an electric drive motor (6) and a control device (10) integrated into the circulation pump assembly (2). At least one internal temperature sensor (16) is arranged in the circulation pump assembly (2) and detects the temperature of the medium delivered by the circulation pump assembly (6) and issues a corresponding temperature signal (42) to the control device (10). The control device (10) is configured, on the basis of the temperature signal (42) of the internal temperature sensor (16), to approximately determine the temperature of the liquid in a liquid storage means (26) which is connected to the circulation pump assembly (2) via a heating circuit (28).

Abstract: A method for controlling the power limit of a pump device includes controlling the power limit of the pump device on the basis of a pump media temperature Tm and an ambient temperature Ta measured inside a control box of the pump device. A pump device, in particular a centrifugal pump, is driven by a motor. The motor is controlled by a control box wherein temperature sensors for measuring a media temperature Tm and an ambient temperature Ta are arranged in the control box so as to control the power limit of the pump device depending on the measured media temperature Tm and an ambient temperature Ta.

Abstract: A method of balancing a heating system with a flow system, including a supply flow line (60) and a return flow line (70), a heat source (55) and a pump (10) hydraulic lines (L1-Ln), some having a heating element (H1-Hn) with a balancing valve (V1-Vn). The method includes: carrying out one or more measurements by opening one hydraulic line only and determining a flow rate through the pump and a pressure difference across the pump, establishing a hydraulic model based on the determined flow rate and pressure difference from at least two measurements from step, and at least one additional measurement for at least two hydraulic lines, specifying a desired flow rate for each of the hydraulic lines, and adjusting one or more of the dedicated balancing valves in order to meet the desired flow rate for each of the hydraulic lines by using the hydraulic model.

Abstract: The invention relates to a service water heating unit (2) comprising at least one heat exchanger (6), which comprises a first flow path (10) for a heating medium and a second flow path (12) for service water to be heated, a cold water line (DCW) and a circulation line (90) for heated service water opening into a junction (97) in an inlet line to the second flow path (12) of the heat exchanger (6), and comprising a control unit (101) for controlling the heating of service water, the control unit (101) being designed for detection of a service water request, wherein the control unit (101) is designed for evaluation of the output signal of a temperature sensor (96) which is arranged in the vicinity of the junction (97), but at a distance therefrom, in the cold water line (DCW).

Abstract: A circulation pump assembly (2) includes an electric drive motor (6) and a control device (10) integrated into the circulation pump assembly (2). At least one internal temperature sensor (16) is arranged in the circulation pump assembly (2) and detects the temperature of the medium delivered by the circulation pump assembly (6) and issues a corresponding temperature signal (42) to the control device (10). The control device (10) is configured, on the basis of the temperature signal (42) of the internal temperature sensor (16), to approximately determine the temperature of the liquid in a liquid storage means (26) which is connected to the circulation pump assembly (2) via a heating circuit (28).

Abstract: The invention relates to a pump system comprising at least one pump unit, a control unit for controlling the pump unit and at least one sensor, wherein the sensor is connected to a data detection module which is spatially separate from the control unit and detects the output signals of the sensor, the data detection module comprises an output interface, at which it provides the detected sensor signals and/or data derived therefrom, and the control unit is provided with an input interface for the acquisition of signals or data from the output interface.

Abstract: A method for controlling the power limit of a pump device includes controlling the power limit of the pump device on the basis of a pump media temperature Tm and an ambient temperature Ta measured inside a control box of the pump device. A pump device, in particular a centrifugal pump, is driven by a motor. The motor is controlled by a control box wherein temperature sensors for measuring a media temperature Tm and an ambient temperature Ta are arranged in the control box so as to control the power limit of the pump device depending on the measured media temperature Tm and an ambient temperature Ta.

Abstract: The invention relates to a pump system comprising at least one pump unit, a control unit for controlling the pump unit and at least one sensor, wherein the sensor is connected to a data detection module which is spatially separate from the control unit and detects the output signals of the sensor, the data detection module comprises an output interface, at which it provides the detected sensor signals and/or data derived therefrom, and the control unit is provided with an input interface for the acquisition of signals or data from the output interface.

Abstract: The invention relates to a service water heating unit (2) comprising at least one heat exchanger (6), which comprises a first flow path (10) for a heating medium and a second flow path (12) for service water to be heated, a cold water line (DCW) and a circulation line (90) for heated service water opening into a junction (97) in an inlet line to the second flow path (12) of the heat exchanger (6), and comprising a control unit (101) for controlling the heating of service water, the control unit (101) being designed for detection of a service water request, wherein the control unit (101) is designed for evaluation of the output signal of a temperature sensor (96) which is arranged in the vicinity of the junction (97), but at a distance therefrom, in the cold water line (DCW).