A controller configured to selectively set a reversible heat pump assembly (100) in either a heating mode or in a cooling mode is presented. The controller comprising a control circuit (44) configured to: for a time period, determine, using a demand determining function (50), a heating demand for heat from one or more local heating circuits (140) connected to the reversible heat pump assembly (100) and a cooling demand for cold from one or more local cooling circuits (140) connected to the reversible heat pump assembly (100); generate, using a control function (52), a control signal indicative of if the reversible heat pump assembly (100) is to be set in either the heating mode or in the cooling mode, wherein the control function is configured to use the heating demand and the cooling demand as input data; and send, using a transmission function (54), the control signal to a heat pump (110) of the reversible heat pump assembly (100). Also a method for controlling the reversible heat pump assembly (100) is presented.

A circulation pump assembly for a heating and/or cooling system includes an electric drive motor (108) and a connected pump housing (106) in which at least one impeller (118) is situated and which comprises a first inlet (112) and a first outlet (114). The pump housing (106) includes a second inlet (122) which is connected in an inside of the pump housing (106) at a mixing point (130) to the first inlet (112). A regulating valve (134), which is designed for regulating the mixing ratio of two flows mixing at the mixing point (130), as well as a control device, which controls the regulating valve (134) for regulating the mixing ration, are arranged in the pump housing (106). A hydraulic manifold is provided with such a circulation pump assembly.

A hydronic system and method of use that will maintain normal system operating pressure while also reliably detecting even very small fluid losses in any closed loop fluid heat transfer system is described. The system includes a controller in communication with one or more pressure sensors and optionally one or more temperature sensors that provides one or more notifications when the pressure drops below predetermined levels.

A water preconditioner system comprising a user interface for manually or automatically receiving inputs from a user, a mixing assembly including a plurality of control valves coupled to hot and cold water supply lines, and a controller in communication with the plurality of control valves and the user interface for controlling the operation of the system. The controller is configured to operate in a plurality of modes to precondition the water to one of a desired preset water dispensing temperature or a target temperature different from the desired preset water dispensing temperature.

The present invention relates to a local thermal energy consumer assembly and a local thermal energy generator assembly to be connected to a thermal energy circuit comprising a hot and a cold conduit. The local thermal energy consumer assembly is selectively connected, via a pump or a valve to the hot conduit. The local thermal energy generator assembly is selectively connected, via a pump or a valve to the cold conduit. The use of either the valve or the pump is controlled by determining a local pressure difference between heat transfer liquid of the hot and the cold conduits.

Provided is a hot-water supply device which stabilizes hot-water supply even at low water pressure. A process performed by a hot-water supply device includes: a step (S510) of detecting that hot-water supply performed by the hot-water supply device is stopped; a step (S520) of reading a set temperature of the hot-water supply from a memory; a step (S530) of calculating a target opening degree of a total water amount servo based on the read set temperature; a step (S540) of sending, to the total water amount servo, a command for setting an opening degree of a passage through which water flows from the total water amount servo into a heat exchanger to the target opening degree; and a step (S550) in which a stepping motor of the total water amount servo moves in response to the command.

A thermally enhanced heating system and a method for thermally enhancing a HVAC system are provided. The thermally enhanced heating system preferably includes an outdoor HVAC unit and an indoor HVAC unit. The indoor HVAC unit includes a first heat exchanger for transferring heat from a refrigerant, a second heat exchanger for transferring heat from a fuel source, and a third heat exchanger for transferring heat to the refrigerant. The outdoor HVAC unit includes an outdoor heat exchanger for transferring heat from an outdoor air to the refrigerant, a pump configured to circulate the refrigerant, and an ejector configured to combine the refrigerant from the outdoor heat exchanger and the third heat exchanger. Preferably the outdoor HVAC unit is operated to circulate the refrigerant through a first refrigerant circuit and a second refrigerant circuit, and combine refrigerant in the first refrigerant circuit and the second refrigerant circuit.

A method for controlling an on-demand high volume capable fluid heating system that supplies a total heating power at a turndown ratio and a total flowrate of a fluid supply, the fluid heating system comprising a plurality of heat exchangers fluidly connected in parallel, each of the plurality of heat exchangers comprising: a fluid conductor, wherein each of the plurality of heat exchangers contributes to the total heating power and a portion of the total flowrate of the fluid supply through the fluid conductor; an inlet conductor configured to connect the fluid supply to the plurality of heat exchangers; an outlet conductor configured for receiving the fluid supply downstream of the plurality of heat exchangers; an auxiliary conductor connecting the inlet conductor at a first location and the outlet conductor, the auxiliary conductor comprising a modulating valve; and a pump disposed downstream from the first location on the inlet conductor.

A filling loop device is provided to facilitate filling of an installed pressurised heating circuit (2) including a boiler (furnace) (1) from a mains supply pipe (3). The device includes a dead-man valve (14) configured to normally close off a water channel provided by a hose (16). This ensures that the channel can only be opened when attended during charging. Conventionally the hose ordinarily used to charge the heating circuit should be removed after isolation valves are closed at the inlet (4) and outlet (6). However careless operatives have been found to have frequently left the hose in place with the isolation valves open causing serious damage to the boiler.

A second embodiment of the invention includes a pressure regulation valve (25) in the filling loop device to prevent careless operatives charging the system to excessive pressure.

A third embodiment provides a pressure regulation valve in the circuit, normally biased to a closed condition with a dead-man actuator to open the channel.

An air pressure regulating device comprises an expansion tank having air stored therein and having an air injection/discharge port at an outside thereof; and a pressure regulation unit provided with a three-way ball valve connected to the air injection/discharge port, a pressure gauge which is installed in any one of flow paths of the three-way ball valve to check an internal pressure of the expansion tank, and a valve core which is installed in a flow path other than the flow path in which the pressure gauge is installed to be capable of injecting or discharging air into or from the expansion tank so as to be capable of controlling the internal pressure of the expansion tank.