EP1418387B1 - Compact heating system with two heating circuits - Google Patents

Description

The invention relates to a compact heating system according to the features specified in the preamble of claim 1.

Compact heating systems of this type are used for heating domestic hot water, ie for hot water on the one hand and for heating heating water on the other. Usually, the water is guided in a heating circuit, in which it is heated in a primary heat exchanger and circulated by a pump through the heating circuit for space heating. For the preparation of hot water, the heating circuit for space heating is switched off, if necessary by means of a switching valve and instead switched on a heating circuit for water heating, which has a secondary heat exchanger in which the hot water is heated. There are a variety of arrangement variants of pump and changeover valve known, for example, in EP 0 825 387 B1 are shown by way of example and schematically. In this case, a distinction is made essentially the types in which the pump are arranged on the cold or the warm side of the primary heat exchanger and the types in which the switching valve on the hot or the cold side of the primary heat exchanger are arranged, the pump and switching valve not necessarily on the same side of the primary heat exchanger must be arranged.

The EP 0 825 387 B1 shows as well as the EP 1 031 795 A the preamble of claim 1.

The present invention relates to a type in which the pump and change-over valve are arranged on the warm side of the primary heat exchanger, ie viewed in the direction of flow between the primary heat exchanger and the secondary heat exchanger or between the primary heat exchanger and space heating are located. Such an arrangement is in EP 0 825 387 B1 by way of example Fig. 7 explained.

Out EP 0 460 399 A2 a comparable arrangement is known, are arranged in the pump and switching member on the warm side of the primary heat exchanger. In this arrangement, however, no directional control valve is provided, but a flow direction-dependent switching flap, which acts on one or the other heating circuit depending on the direction of rotation of the pump. The arrangement described therein requires a special design of the pump, in particular of the centrifugal gear, as well as a corresponding control, which allows a reversal of the direction of rotation of the pump. Apart from the fact that the efficiency of such operating in two directions of rotation pump is significantly worse than that of a pump optimized for a direction of rotation, the control electronics is complex. In addition, the switching flap is prone to failure, especially against deposits.

Against this background, the invention has for its object to provide a generic compact heating system, which is aerodynamically and manufacturing technology favorable and which allows a compact design.

This object is achieved according to the invention by the features specified in claim 1. Advantageous embodiments of the invention are specified in the subclaims, the following description and in the figures.

The basic idea of the present invention is to connect the discharge nozzle of the pump directly to the adjacently arranged valve housing in order thereby to create, on the one hand, a streamlined transition between the pump and the valve housing and, on the other hand, a compact structural unit. Because no piping between these components takes place, results in a compact and stable assembly, in particular, when the pump housing and the valve housing are integrally formed. In addition, the use of a directional control valve in the immediate vicinity of the pump is advantageous, since stable and largely flow-independent switching operations can be ensured over a long period of time. The directional control valve is in particular also insensitive to contamination or deposits.

Preferably, the valve housing is formed so that it has a rear connection pair, which can be connected directly to the secondary heat exchanger, which is usually designed in the form of a plate heat exchanger. Since the plate heat exchanger is usually made of metal and the unit is made of plastic as an injection molded part, the direct connection of the unit to the plate heat exchanger in addition to the advantage of the omitted piping additionally gives the advantage of high stability and a compact design.

In this case, an additional connection unit is provided in an advantageous development of the invention for the other connection pair of the plate heat exchanger, wherein the arrangement is such that the pump housing between the terminal pairs of the plate heat exchanger immediately before this (seen in installation position) is arranged, in this way, a compact design reached. Depending on the construction, the connection unit can be designed either as a separate component or preferably integrally with the assembly, so that all four connections of the plate heat exchanger are directly connected to the unit. In addition to the compact construction, this results in particular in a stability advantage, since the plate heat exchanger then forms a stabilizing base for the assembly.

In order to simplify connection and installation of the unit in the compact heating system and to unify it is expedient to lead out of the unit four adjacent in a row connecting pieces, in such a way that they are directed with respect to their mounting position either down or to the rear. In the context of the invention, a connection stub is understood to mean an opening which can be connected in a suitable manner to a pipe or other component. It does not necessarily have to be a threaded connector, but can also be any other connection component of such a connection. The side-by-side, down-to-back position, makes it easy to connect external lines and make them easy to access.

Preferably, a connecting piece is designed so that it has a backwards or downwards offset by 90 ° and closable further nozzle. On the one hand, this connecting piece has the advantage that a core can be pulled over this further connecting piece and, in addition, offers a further connection possibility, be it for a sensor, a valve, a filter or the like.

For the use of a filter, the additional nozzle is preferably offset by 180 ° to the connecting piece, so that the filter can be inserted from the front, when the connecting piece is directed to the rear. In this way, the replacement of the filter in installation position is easily possible, since accessibility is given from the front.

Preferably, the assembly is connected with its series of connections directly to the in-house piping, since then no further piping is required to allow here the usual screw and prevent the assembly is damaged when connecting the pipes is provided according to the invention . to form the connecting piece made of metal and mold during injection molding in the existing plastic unit. These existing metal connecting pieces then have, for example, a conventional external thread, so that they can be screwed on site with the stationary piping system.

Preferably, the assembly on inserts for temperature, pressure and / or flow sensors, which are arranged so that they are accessible in the installed position, so that they can be replaced quickly and easily in the event of a defect. Such an insert is preferably provided in the heating water return, in the hot water inlet and on the suction side of the pump housing.

In order to be able to drain the water contained therein in the case of repairs, for example to the assembly, a closable discharge opening is provided on the suction side at the bottom of the pump housing according to a development of the invention. This discharge opening is freely accessible from below, so that a collecting vessel can be placed underneath, in which the water flowing out of the system via the outlet opening is collected.

The valve housing according to the invention has a substantially cylindrical shape and is closed at one end by a closure. This closure preferably has a bayonet, so that even in later operation, the valve itself is easily and quickly accessible.

Within the valve housing two sealing seats are provided according to the invention, close the associated sealing body against flow direction and are arranged on a common actuator. This design has the advantage that for each of the heating circuits practically a separate valve is provided, wherein the synchronous Closing and opening is ensured by the common actuator, As a result of the fact that both sealing bodies close against the flow direction, the valve operates virtually independently of flow. There are avoided when flowing closing in the direction of flow sealing bodies due to the flow, which cause a disturbing noise on the other hand can damage the heating system in the long term.

According to the invention, the sealing seats are formed by a valve unit which can be inserted into the valve housing and which comprises both sealing seats and the actuator with the sealing bodies. As a result, on the one hand the housing construction is significantly simplified, which brings manufacturing advantages in terms of the tool and on the other hand, the entire valve unit can be quickly and easily replaced in case of repair, without having to rework, for example, a seated within the housing sealing seat or with the actuator To replace the sealing bodies.

In order to ensure a reliable and long-term stable actuation of the valve, an electric motor driven adjusting device is provided according to the invention, which is laterally connected to the valve housing and having an actuating arm which engages in the valve housing and the actuator positively includes so that the position of the sealing body with respect to to control the sealing seats. In this case, the actuating arm is preferably surrounded by an elastic sealing jacket, which seals the actuating device against the liquid in the valve housing. Alternatively, otherwise the actuator would have to be sealed relative to the housing having the drive and the housing relative to the valve housing. Since the suction nozzle of the pump is to be connected to the usually far above primary heat exchanger, it is expedient, this suction leading out of the pump housing and connect there with a leading to the primary heat exchanger tube. Alternatively, according to the invention, the suction nozzle can also be led out laterally from the pump housing, but in any case transversely to the impeller axis, so that its accessibility is ensured even when installed.

The assembly according to the invention can, even with one-piece design, as will be explained below in detail with reference to an embodiment, manufacturing technology low, namely almost exclusively be made with drawing cores, Preferably, however, in the region of the pressure-side connection between the pump housing and the valve housing, a melting core provided since then this area can be optimized according to exclusively fluidic aspects, which leads to increases in efficiency and in particular also reduces noise emissions in this area.

In an arrangement in which the assembly connects directly to the plate heat exchanger, it is necessary that the channel guide for the domestic water supply is performed within the unit. The guide is expediently such that this channel at least partially surrounds the valve housing, so as to lead this connection to an easily accessible point of the assembly.

According to a further embodiment of the invention, the assembly on guide means, which make it possible to insert them in their installed position from the front, so the assembly can first be spent in a first fixing position in which the connection connections are largely made, after which then the unit via this guide means is moved to its final installation position. As a result, the installation of the compact heating system, in particular the connection the on-site lines considerably simplified and also the replacement in case of repair,

Fig. 1

in stark vereinfachter perspektivischer Darstellung eine erste Ausführungsform einer aus Pumpe und Ventil bestehenden Baueinheit,

Fig. 2

das einstückig ausgebildete Pumpen- und Ventilgehäuse der Baueinheit in Darstellung nach Fig. 1,

Fig. 3

in vergrößerter teilweise geschnittener perspektivischer Darstellung das Ventil mit Antrieb,

Fig. 4

in vergrößerter und teilweiser Schnittdarstellung den Ventilantrieb sowie eine erfindungsgemäße Ausbildung des Ventils,

Fig. 5

eine zweite Ausführungsform einer Baueinheit in Darstellung nach Fig. 1,

Fig. 6

eine dritte Ausführung einer erfindungsgemäßen Baueinheit in perspektivischer Darstellung in Einbaulage,

Fig. 7

die Anordnung gemäß Fig. 6 in perspektivischer Ansicht von hinten und unten,

Fig. 8

die Anordnung nach Fig, 6 in Ansicht von vorne,

Fig. 9

das einstückige Spritzgussteil der Baueinheit in perspektivischer Darstellung entsprechend Fig. 6 und

Fig. 10

das Spritzgussteil gemäß Fig. 9 in perspektivischer Ansicht von hinten und unten entsprechend Fig. 7.

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

Fig. 1

in a highly simplified perspective view of a first embodiment of an existing pump and valve assembly,

Fig. 2

the integrally formed pump and valve housing of the assembly as shown Fig. 1 .

Fig. 3

in an enlarged partially sectioned perspective view of the valve with drive,

Fig. 4

in an enlarged and partial sectional view of the valve drive and an inventive design of the valve,

Fig. 5

a second embodiment of a structural unit in illustration according to Fig. 1 .

Fig. 6

a third embodiment of a structural unit according to the invention in a perspective view in the installed position,

Fig. 7

the arrangement according to Fig. 6 in perspective view from behind and below,

Fig. 8

the arrangement after Fig. 6 in front view,

Fig. 9

the one-piece injection molded part of the assembly in perspective view accordingly Fig. 6 and

Fig. 10

the injection molded part according to Fig. 9 in perspective view from behind and below accordingly Fig. 7 ,

In the compact heating system according to the invention is a Gasterme, in which in a primary heat exchanger water is heated by a gas burner, which passes from the primary heat exchanger in a pump 1, from there to a valve 2, where depending on the valve position either for the Space heating, usually consisting of radiators heating circuit or a secondary heat exchanger 3 is supplied to a heating circuit, which heated line or hot water by means of the secondary heat exchanger 3. Both heating circuits are recirculated downstream in the supply line to the primary heat exchanger. Such a structure is known per se, it is in this context by way of example to the EP 0 825 387 B1 Fig. 7 referenced where this structure is shown.

The present invention is not the above-described structure as such, but rather the specific embodiment of the existing centrifugal pump 1 and valve 2 assembly, as described below.

The pump 1 is an electric motor-driven centrifugal pump, whose (not shown) impeller rotates in a pump housing 4, the pressure port 5 opens into an immediately adjacent substantially cylindrical valve housing 6. About the discharge nozzle 5, the pump housing 4 and the valve housing 6 are hydraulically and mechanically firmly connected. The discharge nozzle 5 opens approximately halfway along the substantially cylindrical valve housing 6, in which a 2/3 way valve is integrated. The valve housing 6 has near its bottom a connection piece 7, which in the installed position to the side, in particular to the left is directed, and which is provided for connection of the heating circuit for the space heating and an upper connecting piece 8 which serves for connection of the second heating circuit, in particular the secondary heat exchanger 3 on the supply side. The valve housing 6 is topffömig in this embodiment, d. h "it has a closed bottom and is sealed at its top by a closure 9. The closure 9 is integrated by means of a bayonet connection from above into the valve housing 6 so that it removes, for example, in case of a required repair of the valve with a handle Depending on the configuration of the valve, the valve housing can also be equipped on the bottom side with such a closure 9, as is shown by way of example in FIG Fig. 3 is shown. Then the valve is accessible from both sides.

Core of in Fig. 1 shown unit is in Fig. 2 individually shown injection molding component 10, which includes the pump housing 4 and the valve housing 6 including the connecting pressure port 5. As the representation after Fig. 2 illustrates, this plastic injection molded part 10 pump housing side on a suction nozzle 11, which in this embodiment perpendicular down, beyond an air separator 12 which is formed at the top for receiving a vent valve 13, a sensor receptacle 14 and the pressure side a discharge nozzle 15. As from Fig. 1 it can be seen, the sensor receptacle 14 is provided for receiving a sensor unit 16, which may have, for example, a pressure sensor and / or a temperature sensor for suction-side detection. The discharge nozzle 15 is usually provided with a sealing cap, which is also mounted in a bayonet. About this port 15, the pump can be drained in installation position, for example, for repair purposes, when the engine and centrifugal existing unit to be replaced. The valve housing 6 has in addition to those already described Connecting piece 7 and 8 and the upper closable by means of the shutter 9 opening still a side port 17 for incorporating an actuator 18 for the valve 2, the example with reference to Figures 3 and 4 is shown.

As the Fig. 2 makes clear that the injection molded part 10 can be prepared except for the area of the pressure port 12 exclusively with drawing cores, only in the area of the pressure nozzle is a melt core required on the tool side, which is advantageous in terms of flow, since this pressure and connection pipe 5 can be optimized exclusively according to flow aspects.

The basic structure of the valve 2 is the Figures 3 and 4 refer to. The valve 2 has in the flow direction the pressure port 5 on the input side and the nozzle 7, 8 on the output side. Each output-side terminal 7 and 8 is associated with a sealing seat 19 and a sealing body 20, in such a way that both sealing bodies 20 close against the flow direction. The sealing body 20 sit on a common rod-like actuator 21 so that they are always moved together. Depending on the position of the actuator 21, the discharge nozzle 5 is conductively connected to the one connecting piece 7 or the other connecting piece 8. In Fig. 3 an intermediate position is shown, which arises during the switching.

The actuator 21 is controlled by means of a lever arm 22 which engages around the actuator 21 in the middle between the sealing bodies 20 from the side in a form-fitting manner. Upwards and downwards, the actuator 21 has two fixedly connected to this disc 23, to which the lever arm 22 is supported in its the switching operation triggering movement. The lever arm 22 is covered with a rubber sleeve, which extends beyond the head 24 of the actuator and thus both the actuator and the lever arm relative to the valve interior seals. The head 24 is seated within the terminal 17 of the component 10. Within the head 24 of the lever arm 22 is pivotally mounted, the other end has a spindle nut which sits on a spindle which is driven by an electric motor in the form of a stepping motor 25.

In the case of Fig. 3 illustrated embodiment, the sealing seats 19 valve housing side are arranged. The sealing body 20 are positively lockingly placed on the actuator 20, so that the sealing body can be replaced after removing the shutters 9, and the sealing seats 19 can optionally be cleaned or reworked. In this embodiment, instead of the bottom in the valve housing 6 there is a closure 9 is provided as well as on the top.

The representation after Fig. 4 shows an embodiment of the invention, in which the entire valve is designed in the form of a cartridge 26 which can be inserted into the valve housing. Function and structure correspond to the prescribed, the essential difference is that the valve seats 19 are no longer provided on the housing side, but form part of the cartridge, the cartridge 26 itself is inserted by means of two O-rings 27 sealingly into the then cylindrical inside valve housing , The O-rings 27 each sit in the area between the discharge nozzle 5 and connecting piece 8 or discharge nozzle 5 and connecting piece 7, actuator 21, actuator 18 and the arrangement of sealing bodies 20 and sealing seats 19 is otherwise the same design as in the above-described embodiment Fig. 3 , In the case of a repair, the cartridge 26 may be pulled upwards out of the valve housing and replaced by an exchange cartridge in this embodiment, optionally after disassembly of the actuator 18 and the shutter 9. Regardless of the cartridge side, the sealing body 20 as described above by the actuator 21st be removed to make the sealing seats 19 accessible or the sealing body 20 to renew.

Fig. 5 shows a variant in which the unit formed from pump 1 and valve 2 includes all that, which is based on the embodiment according to FIGS. 1 and 2 has been described, as well as a rear terminal pair 28 for direct connection to a (in Fig. 5 In this embodiment, pump housing 4, valve housing 6 and the connection pair 28 including a valve housing 6 laterally encompassing channel 29 which is provided with a connection accessible from the rear, integrally formed as a plastic injection molded part 30. Unlike the execution after Fig. 1 However, there is the suction nozzle not down, but led out upwards, ie in the immediate direction to the primary heat exchanger, with which he is to connect. The connection pair 28, which is provided for the direct connection of the plate heat exchanger 3, has a connection to the top 8 corresponding port for supplying the coming from the primary heat exchanger hot water to the plate heat exchanger 3, whereas the lower connection of the connection pair 28 is used to supply the still cold service water.

The channel 29 opens into a rear-facing connection piece 31, to which the cold water supply to the system is to be connected. Accessible from the front, in Fig. 5 not visible, in this channel 29 is still a sensor recording integrated. A connecting piece 32a, which is directed downward in the installed position, is offset by 90 ° to the rear, a further connecting piece 32 assigned. The connection 32 is used for connection to the space heating, whereas the connection 32a serves to connect an overflow device 43 and / or a filling device 51 if required.

In this case, based on Fig. 5 illustrated embodiment, the other connection pair for the secondary heat exchanger 3 may be formed by a separate injection molding component. This is particularly advantageous if heat exchangers of different lengths are to be used in the same gas boiler construction.

Insofar, the more comprehensive is the basis of the FIGS. 6 to 10 illustrated arrangement comprising a unit that includes both pairs of terminals. The plastic injection-molded component 33 of this structural unit comprises both the connection pair 28 and the corresponding connection pair 34, so that this component is firmly connected to the secondary heat exchanger 3 at two regions arranged on both sides of the pump housing 4. The secondary heat exchanger 3 thus supports the plastic injection molded part 33 towards the rear and stabilizes it. The connections of the terminal pair 28 are based on Fig. 5 already described, they are functionally consistent with this embodiment. The connections of the connection pair 34 supplement this, wherein the upper connection, the emerging from the secondary heat exchanger 3 heating water and the lower port of the emerging from the secondary heat exchanger 3 heated hot water, ie the prepared hot water leads. In the case of the injection-molded component 33 too, the pump housing 4 and the valve housing 6 are connected to one another via the pressure connection 5, whereby stabilizing ribs 35 are additionally provided below the pressure connection. Also in this embodiment, a channel 29 is provided which opens into a connecting piece 36 and which has a sensor receptacle 37 accessible from the front.

The upper connection of the connection pair 34 is connected via an obliquely forwards and to the side current channel 38 with a mounting position substantially perpendicular channel portion 39, which leads to a rearwardly directed connection piece 40. The channel portion 39 has both at its upper and at its lower end a terminal, wherein the lower terminal 41 offset by 90 ° to the rear terminal 40 and 90 ° offset to a front terminal 42. On the one hand, these openings serve to pull the cores after the injection molding process and, on the other hand, form receptacles for sensors, for example the forwardly directed valve receptacle 44 in the channel section 39. The upper end of Kanalabschnits 39 is formed as a connecting piece 45 and serves to connect the return line to the primary heat exchanger.

The lower connection of the connection pair 34 is connected via a channel 46, which is directed substantially parallel to the impeller axis to the front and opens into a substantially vertically extending channel section 47. This channel portion 47 is formed at its lower end in the same way, wherein the rear connection piece 48 is provided for connection of the building-side hot water pipe.

The connecting pieces 36 and 32 and 40 and 48 are formed of metal and incorporated into the injection-molded component 33 during injection molding and firmly. They have an external thread, so that they can be connected by means of a union nut directly to the building-side connecting cables. As in particular from the FIGS. 7 and 9 it can be seen that the aforementioned connections are all in a row lying transverse to the wheel axle 49 and are directed all the way to the rear. In this way, the whole in the FIGS. 6 to 8 shown block after releasing these four connections are pulled out of the device forward. For this purpose, guide rails 50 are provided which facilitate this. These integrally formed with the component 33 guide rails cooperate with corresponding guide grooves, which are provided in the on-site firmly mounted part of the gas boiler. As the FIGS. 6 to 8 clarify, can in this embodiment in a simple way an overflow 43 and / or a Wasserbefülleinrichtung 51 are incorporated. The water filling device comprises a line connection between the building-side cold water connection and the heating circuit, which is controllable via a switching device. The overflow device 43 is provided between the flow and the return of the heating circuit for the space heating and serves to ensure that even with the heating circuit closed for space heating, the flow circuit as such remains fluidly. Since both the overflow device 43 and the water filling device 51 are only provided as required, the component 33 is designed such that it can be delivered optionally with or without.

The injection molded part 33 is like the Figures 9 and 10 clarify tooling comparatively cheap manufacture, since only two melt cores are required, namely, as in the other embodiments, a melted core for the discharge nozzle 5 and the spiral pressure-side pump housing part and another melting core for the guided around the filter housing 6 channel 29. Considering the complexity of the component 33, this manufacturing technology is comparatively simple, namely to produce essentially by means of drawing cores, only two melt cores are required. The structure is also extremely compact, and is supported statically by the secondary heat exchanger connected on the back. The forward lower ports (for example, 42) can be used to incorporate filters.

LIST OF REFERENCE NUMBERS

1

pump

2

Valve

3

Secondary heat exchanger (plate heat exchanger)

4

pump housing

5

pressure port

6

valve housing

7

Connecting piece (space heating)

8th

Upper connection (room heating)

9

shutter

10

Injection molded plastic part

11

suction

12

air separator

13

vent valve

14

sensor recording

15

drain plug

16

sensor unit

17

connection

18

actuator

19

sealing seat

20

sealing body

21

actuator

22

lever arm

23

slices

24

head

25

stepper motor

26

cartridge

27

O-rings

28

terminal pair

29

channel

30

Injection molded plastic part

31

spigot

32

spigot

32a

spigot

33

Kunststoffspritzgusstteil

34

spigot

35

ribs

36

spigot

37

sensor recording

38

channel

39

channel section

40

spigot

41

Lower connection

42

Front connection

43

Overflow

44

sensor recording

45

spigot

46

channel

47

channel section

48

spigot

49

wheel axle

50

guide rails

51

Wasserbefülleinrichtung

Claims (19)

1. A compact heating installation with two heating circuits, one for the room heating and one for warm water provision, with a primary heat exchanger, with a secondary heat exchanger (3) for the warm water provision, with a centrifugal pump (1) which delivers a heat transfer medium through the primary heat exchanger and then selectively through the one or the other heating circuit, wherein a directional valve (2) is provided, which depending on the switch position integrates the one or the other heating circuit into a circulation with the primary heat exchanger, wherein the centrifugal pump (1) and the directional valve (2) as a construction unit are arranged on the warm side of the primary heat exchanger, and the delivery branch (5) of the pump (1) connects directly to the valve housing (6) which is arranged next to this, characterised in that two sealing seats (19) are provided within the valve housing (6), whose associated sealing bodies (20) close counter to the flow direction and are arranged on a common actuating element (21) and that a valve unit (26) which comprises the two sealing seats (19) and the actuating element (21) with the sealing bodies (20) is inserted within the valve housing (6).
2. A compact heating installation according to claim 1, characterised in that the pump housing (4) is designed as one piece with the valve housing (6) of the directional valve (2).
3. A compact heating installation according to one of the preceding claims, characterised in that the valve housing (6) comprises a rearward connection pair (28) which is provided and designed for connection onto the secondary heat exchanger in the form of a plate heat exchanger.
4. A compact heating installation according to one of the preceding claims, characterised in that apart from the construction unit consisting of the pump casing (4) and the valve housing (6), a connection unit for the connection to the other connection pair of the plate heat exchanger is provided, in a manner such that the pump (1) is arranged between the valve housing (6) and the connection unit, upstream of the plate heat exchanger (3).
5. A compact heating installation according to one of the preceding claims, characterised in that the construction unit comprises a further rearward connection pair (36) which is provided and designed for connection on the other connection pair of the plate heat exchanger (3).
6. A compact heating installation according to one of the preceding claims, characterised in that the valve housing (6), the pump casing (4) and the connection unit (34) form a single-piece construction unit (33).
7. A compact heating installation according to one of the preceding claims, characterised in that four connection pieces (40, 48, 36, 32) which lie in a row next to one another and which with respect to the installed condition all either lie directed to the bottom or to the rear, are provided.
8. A compact heating installation according to one of the preceding claims, characterised in that a further connection piece (42, 42) which is offset to the rear or downwards by 90° and which is closable is assigned to a connection piece (32, 40, 48).
9. A compact heating installation according to one of the preceding claims, characterised in that a connection piece (40) comprises a further piece (42) which is offset by 180° and into which a filter is inserted.
10. A compact heating installation according to one of the preceding claims, characterised in that the connection pieces (40, 48, 36, 32) are formed from metal and moulded into the construction unit (33) consisting of plastic, on injection moulding.
11. A compact heating installation according to one of the preceding claims, characterised in that inserts (14, 37, 44) for temperature sensors, pressure sensors and/or flow sensors (16) and which are accessible in the installed condition are provided within the construction unit (33), and specifically preferably in the heating water return, in the service water feed and at the suction side on the pump casing.
12. A compact heating installation according to one of the preceding claims, characterised in that a closable drain opening (15) is provided on the base of the pump casing, at the suction side.
13. A compact heating installation according to one of the preceding claims, characterised in that the valve housing (6) essentially has a cylindrical shape and at least at a face side is closed off by a closure (9) which is preferably provided with a bayonet.
14. A compact heating installation according to one of the preceding claims, characterised in that a preferably electromotorically driven actuating device (18) is arranged laterally on the valve housing (6) and whose actuating arm (22) engages into the valve housing (6) and encompasses the actuating element (21) with a positive fit.
15. A compact heating installation according to one of the preceding claims, characterised in that the actuating arm (22) is surrounded by an elastic sealing jacket which seals the actuating device (18) with respect to the fluid located in the valve housing (6).
16. A compact heating installation according to one of the preceding claims, characterised in that the pump casing (4) comprises a suction branch (11) which is preferably arranged to the top or laterally and transversely to the impeller axis (49).
17. A compact heating installation according to one of the preceding claims, characterised in that the connection (5) between the pump casing (4) and the valve housing (6) and which is on the delivery branch side is formed by a lost core in the injection moulding tool.
18. A compact heating installation according to one of the preceding claims, characterised in that the construction unit (30, 33) comprises a service water feed channel (29) which at least in sections encompasses the valve housing (6).
19. A compact heating installation according to one of the preceding claims, characterised in that the construction unit (33) comprises guide means (50) of a nature such that it is insertable into its installation position from the front.

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