EP2093517A1 - Component for a compact heating system - Google Patents

Abstract

The structural unit (1) has a partial structural unit (13) comprising a centrifugal pump (15). A plate heat exchanger (12) comprises a lower pair of connections and an upper pair of connections. The connections are connected with one another in a fluidic-manner by the heat exchanger. Another partial structural unit (14) comprises an electrically controlled switching valve (29) for selectively guiding heat carrying flow to the heat exchanger. The partial structural units are mechanically connected with one another by the heat exchanger, and are connected to the upper pair of connections.

Description

The invention relates to a unit for a compact heating system with two heating circuits, one for the domestic water heating and one for space heating.

Such units are state of the art and are used to accommodate the numerous housed in such a compact heating system components and assemblies and to be able to handle together with the unit as a whole. In this case, the assembly comprises in particular the almost complete piping of the device in one or more injection molded plastic parts. In the latter case, the assembly consists of sub-units, which in turn may be handled individually with the associated components or assemblies and joined to the assembly together. In this case, such a heating systems, which are intended for both space heating and hot water, typically a plate heat exchanger for heating the service water and a heating circulation pump is provided which supplies the heating water, which is heated in a gas-driven primary heat exchanger, the heating circuits. In order to be able to supply either one or the other heating circuit, a changeover valve is also provided. Finally, a variety of connections, receiving spaces for sensors and cable connections are provided, which are to be realized in the smallest possible space manufacturing technology low.

Such a unit is for example off EP 1 528 330 B1 known. There is, as usual in modern constructions, the pump return side and the switching valve arranged upstream. The plate heat exchanger, the design of such units tabular, ie long, narrow and comparatively flat, has near its two narrow sides in each case two ports, each associated with different thermal sides of the plate heat exchanger, the connection being such that the plate heat exchanger in its longitudinal direction is flowed through in opposite directions. At the EP 1 528 330 B1 known unit is the heating water through the lower connections (lower pair of ports) to and discharged whereas the hot water via the upper ports (upper pair of ports) and is discharged. This leads to a compact design, in which two sub-assemblies, each of which is connected to the connections of the plate heat exchanger connected on the one hand by the plate heat exchanger and the other by the pump housing centrally arranged therebetween.

Although this arrangement is extremely compact and manufacturing technology advantageous, but also has design disadvantages. Thus, the connecting pieces, which typically go down in such compact heating systems, arranged distributed over the ground plane two-dimensionally. Since the plate heat exchanger is typically made of metal, the subassemblies and the pump housing, however, made of plastic, in this known construction, the materials are carefully matched to each other so that thermal expansion does not cause unacceptably high voltages in the unit. Also, the construction requires the gas flow within the compact heating system in the side area, which is not always desired.

Against this background, the invention has for its object to provide a generic structural unit, which is the aforementioned Disadvantages largely avoids, at least reduced and which is inexpensive to produce and their components are easily accessible in the installed state.

This object is achieved according to the invention by the features listed in claim 1. Advantageous embodiments are shown in the subclaims, the following description and the drawing.

The assembly according to the invention for a compact heating system with two heating circuits, one for the domestic water heating and one for the space heating, has a first sub-assembly, which has a centrifugal pump. The assembly is also equipped with a plate heat exchanger, which has a lower pair of ports and an upper pair of ports in the installed position, which are each connected fluid-conductively via the plate heat exchanger. A second subassembly has an electrically controlled changeover valve for selectively guiding a heat carrier flow coming from a primary heat exchanger to the heating circuit for the space heating or to the plate heat exchanger. The two sub-assemblies are mechanically interconnected by the plate heat exchanger and connect at least to the top pair of the plate heat exchanger. The upper connection pair of the plate heat exchanger leads the heating water, whereas the lower connection pair leads the hot water.

The above-mentioned and also mentioned hereinafter spatial allocations relate to the installation position of the unit in the heating system from the front, so seen from the operating side. Such a compact heating system is typically arranged wall-mounted, with all four water connections and the gas connection are supplied from below. As the primary heat exchanger, over the heating water is heated by means of a gas flame in the upper part of the compact heating system, that is arranged above the unit, the arrangement in installation position inevitably dergestalt that the plate heat exchanger is arranged with its flat side approximately wall-parallel, the wiring to the primary heat exchanger near the right and on the left side of the system and the piping connections for the room heating (supply and return) and for the service water (inflow of cold water and hot water connection) are led downwards.

The inventive design of the unit stands out from the prior art already substantially by the fact that the wiring is chosen so that the upper connection pair of the plate heat exchanger leads the heating water, whereas the lower leads the hot water. This is particularly advantageous because it structurally facilitates a connection arrangement in which the down out of the assembly out in a row connections approximately parallel to the wall on which the compact heating system is located, is located. In this arrangement, namely the user-water-carrying connections must not be performed in front of or behind the hot water-carrying connections, but can be derived practically directly down. The wiring to the primary heat exchanger is simplified, which must necessarily be directed upward due to the installation position in the upper arrangement of the primary heat exchanger.

Another significant advantage of the assembly according to the invention is that the sub-assemblies are mechanically connected via the plate heat exchanger, in such a way that they are advantageous only or substantially only connected via the plate heat exchanger. This arrangement is by design free of stresses that are caused by thermal expansion of the plate heat exchanger. In addition, the entire unit can be simple and be formed inexpensively by only two sub-assemblies and the already separately produced plate heat exchanger. Finally, the arrangement of the assembly according to the invention enables a central gas guide approximately in the middle of the compact heating system, since in this construction, a corresponding clearance can be formed in this area.

In modern compact heating systems, an electrically controlled switching valve has proven to have a substantially cylindrical receptacle for at least one, but typically two movable switch body. These switch body sit on a shift rod, which is typically moved by an electric motor. According to the invention, the cylindrical receptacle of the switching valve is arranged so that it is arranged in the installed position in front of the plate heat exchanger and with its longitudinal central axis parallel thereto. Such an arrangement is unusual and offers design, manufacturing and technical advantages. In particular, it is thus possible, without lost cores, to create a supply connection for the space heating, which leads downwards from the receptacle. In this case, the arrangement is advantageous in that the longitudinal central axis of the receptacle is arranged at a right angle askew to the running axis of the centrifugal pump.

According to an advantageous embodiment of the invention, the receptacle on an end-side closure over which the one or more of the switching body are accessible and which is accessible in the installed position of the page. Advantageously, the arrangement is such that remains until the side panel of the compact heating system sufficient clearance that allows removal or replacement of the switch body without problems.

If, which is advantageous, the switch body is moved by an electric motor, then, according to the invention, the electric motor can be arranged in the installation position on the receptacle for the switch body and directed to the primary heat exchanger connecting piece of the changeover valve in installation position forward. In this arrangement, in the installed position leading to the primary heat exchanger connecting piece of the changeover valve is particularly accessible, the electric motor is protected by the liquid-carrying components of the assembly.

Altnernativ is provided according to the invention to arrange the electric motor in the installed position before receiving the switch body and directed to the primary heat exchanger leading connecting piece of the change-over valve in the installed position upwards. In this arrangement, the electric motor in installation position is particularly well accessible from the front, in addition, there is a largely direct wiring to the primary heat exchanger out.

Even if the mechanical connection of the sub-assemblies takes place through the plate heat exchanger, depending on the design of the heating system, it may be necessary to provide further line connections between the sub-assemblies, so typically a bypass between flow and return. According to one embodiment of the invention, such a bypass is advantageously formed by an arranged in the installed position in front of the plate heat exchanger pipe section, which line interconnects the sub-assemblies accordingly. In this case, the pipe section should be possible parallel to the longitudinal center axis of the plate heat exchanger and telescopic, so on the one tolerances of the plate heat exchanger with respect to the distance of the terminals of a terminal pair can be compensated in a simple manner, on the other hand thermal expansions of the typically metallic plate heat exchanger compared to the otherwise typically made of plastic injection molding sub-assemblies can be compensated. The telescoping can be ensured in a simple manner by nested pipe sections with intermediate seal, such as an O-ring.

According to one embodiment of the invention, the bypass line is provided with a double bend, wherein a substantially perpendicular to the plate heat exchanger part receives in an installed position from the front preferably between two connecting pieces of the unit accessible and influencing the flow through the bypass actuator mechanism. Such an adjustment mechanism can then be advantageously incorporated from the front and is easily accessible even in the installed position.

Advantageously, at least one further connection can be provided in the front pipe section arranged parallel to the heat exchanger, for example for the integration of a sensor. This is particularly favorable, since on the one hand this area is particularly well accessible in the installed position, and on the other hand, it is difficult to implement in terms of tool technology, so that the provision of such a further connection increases the tool costs only insignificantly.

According to an advantageous development of the invention, the first subassembly has a flow rate regulator, which is advantageously arranged in a common housing with the centrifugal pump. Such a flow regulator is provided for the service water flowing through the unit and to be heated and typically operates mechanically, but may also be electrically controlled via an electronic control, in the form of a control valve. Such a flow regulator ensures that, regardless of the line pressure, essentially the same amount flows through when the service water extraction valve is fully opened. This ensures in particular that at too high line pressure the Hot water in the plate heat exchanger can still be heated to the desired temperature, ie that whenever possible water can be removed at the same temperature. It is advantageous according to the invention, the flow regulator arranged in a common housing with the centrifugal pump. Such a housing may be constructed in one or more parts, in a multi-part design there is the advantage that the same unit can be created either with or without flow regulator, without making major structural changes.

Advantageously, in the first sub-assembly side by side arranged pipe sections are provided which are interconnected by a component having at least parts of the flow regulator, in which the flow is deflected by about 180 °. Such a component can be easily replaced by a 180 ° elbow manifold for a simplified design without a regulator, without having to change the construction and thus the injection molding tool or the injection molding tools for the first sub-assembly.

The line sections are advantageously connected in such a way that one of the line sections adjoins the heat exchanger and the other line section preferably adjoins or forms a lower connection of the building unit in the installed position. In this case, the non-adjoining the heat exchanger line section advantageously has a flow meter. Advantageously, a flow meter operating according to the vortex principle is incorporated here, wherein the line section is designed so that a sufficient distance for calming the flow and after the obstruction a sufficient measuring section is formed before the obstruction which triggers the oscillation of the flow the flow rate-dependent vibration can form and can be detected by a pressure sensor or differential pressure sensor. For this purpose, it is expedient, the flow meter to arrange near the beginning of the line section seen in the direction of flow, ie in the direction of flow with sufficient distance in front of the flow regulator.

Appropriately, the aforementioned line sections are arranged side by side, in such a way that they are arranged in the installed position approximately perpendicular and side by side in front of the plate heat exchanger next to the centrifugal pump. Such parallel line sections are particularly favorable in terms of production since they can be produced with simple drawing cores. The same applies to the connections to be provided perpendicular to the line sections, be it to the plate heat exchanger or to accommodate the flow meter.

Advantageously, the line section leading from the flow regulator to the plate heat exchanger has an opening which is conductively connected to the suction side of the pump. The connection thus formed with the suction side of the pump can then serve for the integration of a shut-off valve, via which the heating system can be filled without having to provide a separate line connection for this purpose. Since this is not permitted in all countries, alternatively, the sub-assembly may also be formed without opening, which is possible by slight change of the tool, in which case advantageously a shut-off valve and a connecting piece is provided on this sub-assembly and on the other sub-assembly also with a connecting piece Shut-off valve, but for service water. These can be connected depending on the admissibility to fill the heating system with a hose or stationary connected to a Disconnecteur, which additionally has a check valve to ensure that no water from the heating system can flow back into the service water pipe.

For incorporation of the aforementioned valve, it is advantageous if the opening opens into a preferably open at the bottom valve chamber (in installation position), which is provided for receiving a valve body with which either the line connection between the service water pipe and the heating cable can be interrupted or connected or but the line connection between the connecting piece and the heating cable can be made or interrupted.

Fig. 1

in perspektivischer vereinfachter Darstellung eine erfindungsgemäße Baueinheit in Einbaulage im Chassis einer Kompaktheizungsanlage,

Fig. 2

eine perspektivische Ansicht der Baueinheit,

Fig. 3

eine Draufsicht auf die Baueinheit,

Fig. 4

eine Ansicht von vorne auf die Baueinheit,

Fig. 5

eine Ansicht von der ein Einbaulage rechten Seite auf die Baueinheit,

Fig. 6

eine Ansicht von der in Einbaulage linken Seite auf die Baueinheit,

Fig. 7

die einen Bypass bildenden und die Teilbaueinheiten verbindenden Bauteile in perspektivischer Darstellung,

Fig. 8

eine Ansicht auf die Bauteile gemäß Fig. 7 in Einbaulage gesehen von vorne,

Fig. 9

einen Schnitt längs der Linie A-A in Fig. 8,

Fig. 10

eine perspektivische Ansicht des Druckreglers,

Fig. 11

den Druckregler gemäß Fig. 10 im Schnitt,

Fig. 12

den Stellkörper des Druckreglers in Ansicht,

Fig. 13

einen Längsschnitt durch die parallel nebeneinander verlaufenden Leitungsabschnitte der ersten Teilbaueinheit,

Fig. 14

einen Längsschnitt durch die erste Teilbaueinheit im Bereich der Anschlussstutzen und

Fig. 15

ein hydraulisches Schaltbild der Heizungsanlage mit Baueinheit.

The invention is explained in more detail with reference to an embodiment shown in the drawing. Show it:

Fig. 1

in perspective simplified representation of an assembly according to the invention in the installed position in the chassis of a compact heating system,

Fig. 2

a perspective view of the unit,

Fig. 3

a plan view of the unit,

Fig. 4

a view from the front of the unit,

Fig. 5

a view from the one installation position right side on the unit,

Fig. 6

a view from the left in the mounting position on the unit,

Fig. 7

the components forming a bypass and connecting the sub-assemblies in a perspective view,

Fig. 8

a view of the components according to Fig. 7 seen in installation position from the front,

Fig. 9

a section along the line AA in Fig. 8 .

Fig. 10

a perspective view of the pressure regulator,

Fig. 11

the pressure regulator according to Fig. 10 on average,

Fig. 12

the actuator of the pressure regulator in view,

Fig. 13

a longitudinal section through the parallel adjacent line sections of the first sub-assembly,

Fig. 14

a longitudinal section through the first sub-assembly in the region of the connecting piece and

Fig. 15

a hydraulic circuit diagram of the heating system with unit.

The assembly 1 shown in the figures is arranged in the installed position in a chassis 2, which accommodates all components of the compact heating system and is attached to its rear wall 3 typically hanging on a wall or can be fixed floor-mounted or ceiling-mounted in providing a corresponding frame. The assembly 1 is arranged in the lower part of the chassis 2 and has four downgoing outgoing lines 4, 5, 6 and 7, which lie in a row parallel to the rear wall of the chassis 2 and to which the house-side water-carrying lines are connected. The upper part of the assembly 1 is, as usual in these devices, for receiving a burner and a primary heat exchanger arranged above it, these components are in Fig. 1 away. The assembly 1 has a right side in installation position upwards to the primary heat exchanger outgoing line 8, and a left side arranged, coming from the top of the primary heat exchanger line 9. Centrally centrally, a gas line 10 is guided, which is arranged in front of the unit 1 and in a likewise arranged in front of the unit 1 valve unit 11, which controls the gas supply to the burner.

The assembly 1 has a plate heat exchanger 12, which is arranged parallel to the rear wall 3 and is tabular. In the installation position, a first sub-assembly 13 shoots from the front on the plate heat exchanger 12 and a second sub-assembly 14 on the left side. The sub-assemblies 13 and 14 are essentially made of plastic injection molded bodies and arranged so that their mechanical connection substantially over the existing metal Plate heat exchanger 5 takes place.

The cable routing within the unit 1 and within the compact heating system results in detail Fig. 15 , The flowing back from the return of the space heating water passes through the right in the installed position line connection in the line 7 and thus in the first sub-assembly 13, which includes, inter alia, a centrifugal pump 15 and an air separator 16. The line 7 opens into the suction chamber of the centrifugal pump 15, to which the air separator 16 connects at the top. The discharge nozzle of the pump 15 is connected to the leading to the primary heat exchanger line 8. The pump housing and the remaining lines of the first sub-assembly 13 are formed by an injection-molded component. The centrifugal pump 15 has, as usual in such units, a flanged, in the installed position accessible from the front electric motor 17, the terminal box 18 is disposed at the top of the motor housing.

In installation position from the front ( Fig. 4 Seen to the left of the pump 5 are two parallel to each other side by side in front of the plate heat exchanger 12 vertically arranged line sections 19 and 20 are provided, of which the left, arranged by the pump 15 with spaced line section 19 leads vertically down to the line 6 of the assembly 1 and forms this. About this line 6, the in-house service water pipe is connected. In this line section 9 is near the beginning of a line in Fig. 13 provided in the flow projecting obstruction 40 and provided in the flow direction at a distance behind a differential pressure sensor 41 which is provided in a direction perpendicular to the line section 19 connecting piece as removable sensor unit 21. This is a flow meter which works according to the vortex principle and detects the flow velocity of the process water flowing into the unit 1.

At the upper end of the line section 19 includes a flow diverting by 180 ° component 22, which connects the line section 19 with the right in the installed position next to it between pump 15 and line section 19 arranged right line section 20. The component 22 comprises a flow regulator, with which the flow rate is controlled, so that it is substantially independent of the line pressure. For this purpose, a pin-shaped actuating body 23 in the component 22 is arranged in alignment with the line section 20. The adjusting body has at its upper end a tool holder, here a square, with which it can be rotated about its longitudinal axis. The adjusting body 23 is mounted by means of a thread in the component 22, so that depending on the direction of rotation a flow-limiting provided with axis-parallel groove-like channels cone 24 more or less in an elastic receptacle 25 (see Fig. 13 ) can be inserted, which is incorporated at the upper end of the right line section 20. Such flow regulators are state of the art, which is why their function is not described in detail here. The sealing of the actuating body 23 to the outside via a on the actuator body 23 arranged O-ring. The component 22 is fastened by means of screws to the line sections 19 and 20 laterally projecting projections. If a flow rate regulator is not to be provided, the component 22 can be replaced by a 180 ° pipe bend without the injection molding component of the first substructure unit 13 adjoining it having to be changed.

The installation in the lower end of the line section 20 is connected via an arcuately guided in the sub-assembly 13 channel line section 42 with the lower right in the installed position of the plate heat exchanger 12. The overlying upper port of the plate heat exchanger 12 is connected via a likewise arcuate line section 43 with the suction chamber of the pump 15. These line sections 42 and 43 are arc-shaped, so that they can be formed by pivot cores from the back of the sub-assembly 13, while allowing a certain lateral offset.

The line section 42 has an opening at the bottom, which lines lead this line section 42 with a vertically downwardly leading channel 44, which formed widened down and forms a receptacle 45 for a valve 46, the valve body 47 via a from the outside between the Connection piece for the cold service water and the connection piece for the return of the heating water is arranged and accessible. This valve 46 has a sealing body 48 near the upper end of the valve body 47, which closes or opens the channel 44 depending on the position of the valve and then over the space formed by the receptacle 45 with a subsequent back within the sub-assembly 13 to the bypass line line and thus connects to the return side of the heating circuit. By means of this valve 46, the service water pipe with connected to the heating circuit to fill the heating circuit or refill.

Alternatively, the sub-assembly 13 may be formed by correspondingly changing the take-up 45 and the channel 44 forming die core of the tool so that an opening between the channel 44 and the line section 42 is not formed. Then, the valve 46 is modified so that it forms only a connecting piece, which is connected depending on the position of the valve body 47 to the heating circuit or is closed off in contrast. This nozzle is then also used to fill or refill the heating circuit with water and is either fixed via a Disconnecteur, d. H. connected via a line with non-return valve located therein with the hot water side of the other, in installation position left sub-assembly 14 or via a hose-like line with a corresponding connection to the sub-assembly 14, which is also equipped there with a shut-off valve.

The right-hand conduit section 20 adjoins the lower right-hand connection of the plate heat exchanger 12 in the installed position so that the cold process water flows into the lower right-hand connection of the plate heat exchanger 12, flows through this to the lower left connection and there in a line part bent downwards through 90 ° opens, which forms at the end of the line 5 for emerging from the unit 1 warm hot water. This hot water is heated by heating water flowing countercurrently from the upper left port of the plate heat exchanger 12 to the upper right port. The upper right-hand connection is connected via a line section to the suction chamber of the pump 15 of the first sub-assembly 13.

The emerging from the primary heat exchanger hot heat transfer medium passes through the line 9 via a line section 26, which is part of the second unit 14 and seen in the installation position extends down and behind in an arc (s. Fig. 2 The receptacle 27 lies with its axis parallel to the plate heat exchanger 12 and at right angles askew to the impeller axis of the centrifugal pump 15. The recording is to the left in installation position from the left side a closure lid 29 accessible after removing the switch body can be pulled out of the receptacle side.

Center of the receptacle 27 opens the line section 26, depending on the switching position of the switching body of the switching valve 28, the coming from the primary heat exchanger line 9 connects with the line 4 for the flow of space heating or with the upper left in the installation position of the plate heat exchanger 12 for heating the service water , Accordingly, the conduit 4 close to the open end of the receptacle 27 substantially down to this, whereas the line section 26 adjacent thereto, substantially from above and front and the plate heat exchanger 12 leading line near the closed end of the receptacle 27 connects.

The switching valve 28 is controlled by an electric servomotor 30, which is above the plate heat exchanger 12, however, arranged in front of this and the axis of rotation lies in a vertical plane in which the longitudinal axis of the receptacle 27 is seconded. The switching valve 28 with the associated servomotor 30 is not described in detail here, it is so far as an example EP 04 026 233 A1 referenced where such a valve is described in detail.

The second sub-assembly 14, whose basic structure is also formed of a plastic injection molded part, thus includes the switching valve 28 with the corresponding line connections and is firmly connected to the left in the installed position line connections of the plate heat exchanger 12, thus also includes the line 5. Mechanically, the first sub-assembly 13 and the second sub-assembly 14 substantially connected to each other via the plate heat exchanger 12, but also connect other compounds, such as the bottom plate of the chassis 2 and a bypass line, but which are connected so that they in the longitudinal direction of the plate heat exchanger 12 (in installation position in horizontal Direction) are movably guided in order to avoid the introduction of thermal stresses due to different material expansions.

To the line 4 for the flow of the space heating closes the back with a line section 31 to a bypass line 32, which connects the second sub-unit 14 with the first sub-unit 13 and laterally connected to the first sub-unit 13 in the region between plate heat exchanger 12 and the line sections 19 and 20 and thus forms a connection to the suction region of the pump 15. The line section 31 connects to a perpendicular thereto in the same plane extending line portion 33 which extends in addition to the plate heat exchanger 12 in alignment with it. This is angled in the installed position on the right side by 90 ° to the front and there goes into a line section 34 which is open toward the front and serves to receive a valve 35 in the form of an adjustable pressure relief valve. Near the front end of the line section 34, a line section 36 connects to the right, which extends parallel to the plate heat exchanger 12 in front of it. A back of this cantilevered support 37 comes to the bottom of the plate heat exchanger 12 to the plant. At this line section 36 in turn closes perpendicular to a fitting 38 receiving and thus open to the front line section on, which is designed here for example as a filling valve for filling the heating system with water. The right end of the line section 36 is provided with an O-ring 39 and guided only in the direction transverse to the longitudinal axis of the line section 36 in the corresponding aligned receiving the first sub-assembly 14 so that a movement in the axial direction to compensate for tolerances and thermal expansion is possible.

LIST OF REFERENCE NUMBERS

1 -

unit

2 -

chassis

3 -

rear wall

4 -

Line for the heating flow

5 -

Head for the hot service water

6 -

Line for the cold process water

7 -

Line for the heating return

8th -

Line to the primary heat exchanger

9 -

Line from the primary heat exchanger

10 -

gas pipe

11 -

valve unit

12 -

Plate heat exchanger

13 -

first sub-assembly

14 -

second sub-assembly

15 -

rotary pump

16 -

air separator

17 -

electric motor

18 -

terminal box

19 -

Line section left vertical

20 -

Line section right vertical

21 -

Sensor unit Vortex

22 -

component

23 -

adjusting body

24 -

cone

25 -

elastic absorption

26 -

line section

27 -

Recording of the changeover valve

28 -

switching valve

29 -

cap

30 -

servomotor

31 -

line section

32 -

bypass line

33 -

line section

34 -

line section

35 -

fitting

36 -

line section

37 -

support

38 -

fitting

39 -

O-ring

40 -

obstruction

41 -

Differential Pressure Sensor

42 -

line section

43 -

line section

44 -

channel

45 -

admission

46 -

Valve

47 -

valve body

48 -

sealing body

Claims (17)

Assembly for a compact heating system with two heating circuits, one for domestic water heating and one for room heating, with a first sub-assembly (13), which has a centrifugal pump (15), with a plate heat exchanger (12) with a lower mounting pair in installation position and in an installed position upper pair of connections, which are each fluid-conductively connected to each other via the plate heat exchanger (12), and a second Teilbaueinheit (14) having an electrically controlled switching valve (29) for selectively guiding a coming from a primary heat exchanger heat transfer to the heating circuit for space heating or plate heat exchanger (12), wherein the sub-assemblies (13, 14) are mechanically interconnected by the plate heat exchanger (12) and connect at least to the upper pair of terminals of the plate heat exchanger (12), which carries the heating water. An assembly according to claim 1, wherein the switching valve (29) has a substantially cylindrical receptacle (27) for at least one movable switch body, and is arranged such that the receptacle (27) in the installed position in front of the plate heat exchanger (12) and with its longitudinal central axis is arranged substantially parallel thereto. Assembly according to one of the preceding claims, in which the longitudinal central axis of the receptacle (27) is skewed at a right angle to the impeller axis of the centrifugal pump (15). Assembly according to one of the preceding claims, wherein the receptacle (27) has a front-side closure (29) which is accessible in the installed position from the side. Assembly according to one of claims 2 to 4, wherein the switch body is movable by an electric motor and the electric motor (30) is arranged in the installed position above the receptacle (27) for the switch body and wherein the changeover valve (28) has a connection leading to the primary heat exchanger, which is directed forward in the installed position. Assembly according to one of claims 2 to 4, wherein the switch body is movable by an electric motor and the electric motor (30) is arranged in the installed position before receiving (27) for the switch body and wherein the changeover valve (28) has a leading to the primary heat exchanger port, which is directed in installation position upwards. Assembly according to one of the preceding claims, in which the substructure units (13, 14) are connected by a pipe section (32) arranged in the installation position in front of the plate heat exchanger (12), which forms a bypass (32) between flow and return. Assembly according to Claim 7, in which the bypass is designed to be telescopic in a pipe section (36) arranged parallel to the heat exchanger (12). Assembly according to Claim 7 or 8, in which the tube section (32) has a double bend, wherein a part (34) arranged substantially perpendicular to the plate heat exchanger (12) a in the installation position from the front preferably between two connecting pieces of the assembly (1) accessible and the flow through the bypass (32) influencing adjusting mechanism (35) receives. Assembly according to one of the preceding claims, in which the bypass (32) has at least one further connection, in particular in a pipe section (36) arranged parallel to the heat exchanger (12). Assembly according to one of the preceding claims, wherein the first sub-assembly (13) comprises a flow rate regulator (24, 25) preferably in a common housing with the centrifugal pump (15). Assembly according to one of the preceding claims, in which in the first sub-assembly (13) juxtaposed line sections (19, 20) are provided, which by a at least parts of the flow rate regulator (24, 25) exhibiting component (22) are conductively connected to each other, in which the flow is deflected by about 180 °. Assembly according to Claim 12, in which one line section (20) connects to the heat exchanger (12) and the other line section (19) has a flow meter (41, 41). Assembly according to claim 13, wherein the flow meter (40, 41) is a vortexing principle and is arranged in the flow direction near the beginning of the other pipe section (19). Assembly according to one of claims 12 to 14, in which the juxtaposed line sections (19, 20) in the installed position are arranged approximately vertically in front of the plate heat exchanger (12) and next to the centrifugal pump (15). Assembly according to one of the preceding claims, in which from the flow rate regulator (24, 25) to the plate heat exchanger (12) leading line section (42) has an opening (44) which is line connectable to the suction side of the pump (15). Assembly according to Claim 12, in which the opening (44) opens into a valve chamber (45) which is preferably open in the installed position and which is designed to receive a valve body (47).

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