The present application provides apparatus (15) for connection to an HVAC-R system during maintenance or commissioning. The apparatus includes a plurality of ports (16, 17, 18) for fluid connection to the HVAC-R system and to maintenance apparatus, for example a refrigerant tank, a refrigerant recovery unit and/or a vacuum pump. The apparatus also includes a plurality of fluid connections (20) between the plurality of ports, each of the plurality of fluid connections having an electrically actuatable valve (21) to open and close the fluid connection. The apparatus also includes a control unit configured to control each of the electrically actuatable valves to configure the plurality of fluid connections.

A heating/cooling system modulates the temperature of water flowing through a hydronic emitter by mixing water flows through a mixing valve. The mixing valve has an inlet connect to a water flow pipe, an inlet connected to a water return pipe, and an outlet connected to the hydronic emitter. Water flows through the inlets are configured to obtain a desired mixed water flow at a targeted temperature through the outlet. A controller receives temperature information from a thermometer and then determines the targeted temperature of the outlet. The controller then determines an inlet ratio and configures the mixing valve based on the ratio. The heating/cooling system may support one or more heating/cooling zones and may operate either in a heating or a cooling mode.

A hydraulic construction unit for a heating facility or air-conditioning facility, includes a return connection (20) and a first feed connection (16) for a heating circuit (6), with a heat source outlet (12) fluid conducting connected to the return connection. A heat source inlet (14) is fluid conducting connected to the first feed connection and to a circulation pump assembly (28) in a flow path between the return connection and the heat source outlet (12) or in a flow path between the heat source inlet and the first feed connection. A second feed connection (18) for a second heating circuit (8), is fluid conducting connected to the heat source inlet and to the return connection. A mixing valve (54) is arranged in a flow path from the heat source inlet to the second feed connection and/or in a flow path from the return connection to the second feed connection.

The present disclosure is directed to systems and methods for automatically detecting a leak of a closed loop hydronic boiler system having a makeup water inlet line. The system may include a fluid flow sensor configured to sense fluid flow through the makeup water inlet line, and optionally a pressure sensor and/or a water chemistry sensor. In addition, the system may include a processor configured to detect positive movement of makeup water through the makeup water inlet line indicative of a leak of the hydronic boiler system based on the measured fluid flow, and cause a display to display information indicative of the leak upon detection of positive movement of makeup water through the makeup water inlet line. In some embodiments, the processor further may automatically adjust operations of the hydronic boiler system responsive to detection of the leak.

A hydraulic network (1) having plural parallel zones (Z1, Z2) with a regulating valve (V1, V2) in each zone for regulating a flow of fluid (1, 2) through respective zones. Characteristic parameters of the hydraulic network (1) include static flow capacity values (Kex,a, Kex,b) of the zones. Measurement data sets are recorded which include a determined value of a hydraulic system variable of the hydraulic network (1), e.g. the total flow (tot) or the system pressure (P), and valve positions of the regulating valves (V1, V2) set for the determined value of the hydraulic system variable. The characteristic parameters are calculated from plural measurement data sets, by grouping related measurement data sets, which include the same value of the hydraulic system variable but different valve positions, and by using the flow capacity (Kvalve,a, Kvalve,b) of the regulating valves (V1, V2) at the valve positions included in the data sets.

A housing unit (22) for a heating device with two heating circuits, one for space heating and another for service water heating, includes a pump housing (23) for a recirculation pump (8). The housing unit (22) encompasses a switching valve for switching the heating circuits, and in its rear installation position exhibits at least one port to directly connect a plate heat exchanger (6) for heating service water. An opening (29) for the return of the space heater is arranged on one side of the housing unit. The housing unit incorporates an inlet chamber (28), which is adjoined by the inlet mouth (26) of the pump (8), and into which two channels empty, of which one or the other can be optionally closed by a valve body (32), and of which one channel leads to the line port (30) for the return, and the other channel leads to a port of the plate heat exchanger (6).

The present disclosure is directed to systems and methods for automatically detecting a leak of a closed loop hydronic boiler system having a makeup water inlet line. The system may include a fluid flow sensor configured to sense fluid flow through the makeup water inlet line, and optionally a pressure sensor and/or a water chemistry sensor. In addition, the system may include a processor configured to detect positive movement of makeup water through the makeup water inlet line indicative of a leak of the hydronic boiler system based on the measured fluid flow, and cause a display to display information indicative of the leak upon detection of positive movement of makeup water through the makeup water inlet line. In some embodiments, the processor further may automatically adjust operations of the hydronic boiler system responsive to detection of the leak.