WO2019162919A1

WO2019162919A1 - Method and device for connecting a wall-mounted boiler relative to a hydraulic and/or heating and/or town gas system

Info

Publication number: WO2019162919A1
Application number: PCT/IB2019/051507
Authority: WO
Inventors: Gianluca LUPO
Original assignee: Lupo Gianluca
Priority date: 2018-02-26
Filing date: 2019-02-25
Publication date: 2019-08-29
Also published as: IT201800003056A1

Abstract

Method and device for connecting a wall-mounted boiler relative to a hydraulic hot water and/or heating system, and optionally relative to a town gas system, comprising the steps of: - providing support means configured to support a plurality of hydraulic duct means, and optionally pneumatic duct means, in an arrangement corresponding to at least some of said connector means provided in the lower part of said boiler; - providing said plurality of hydraulic duct means, and optionally of the pneumatic duct means; - providing stable retaining means, relative to said support means, of said hydraulic duct means, and optionally of said pneumatic duct means; - arranging said plurality of hydraulic duct means, and optionally said pneumatic duct means, at least partially corresponding to said connector means provided in the lower part of said boiler, in said support means arranged corresponding to at least some of said connector means provided in the lower part of said boiler for hydraulic, optionally pneumatic, connection to the same by means of said corresponding connector means; - retaining said plurality of hydraulic duct means, and optionally said pneumatic duct means, at least partially corresponding to said connector means provided in the lower part of said boiler, relative to said support means, by means of said stable retaining means, in said arrangement corresponding to at least some of said connector means provided in the lower part of said boiler, for hydraulic connection, optionally pneumatic connection, to the same; - providing and superimposing at least front covering means.

Description

METHOD AND DEVICE FOR CONNECTING A WALL-MOUNTED BOILER RELATIVE TO A HYDRAULIC AND/OR HEATING AND/OR TOWN GAS SYSTEM

The present invention relates to a method for connecting a wall-mounted boiler rela- tive to a hydraulic hot water and/or heating system and, optionally, related gas sys- tem. The invention also relates to a device for connecting a wall-mounted boiler rela- tive to a hydraulic hot water and/or heating system and, optionally, related gas sys- tem.

In all wall-mounted boilers it is possible to distinguish two types of basic circuits: the hydraulic circuit and the town gas circuit. Other common components to all boilers are: the control panel, the printed circuit board (electrically powered) and various technical accessories, provided by the manufacturer to deal with the various require- ments for installation, operation and integration with different types of systems.

The dimensions of a boiler are, generally, around 80 cm in height, around 40 cm in width and 30 cm in depth.

The hydraulic circuit in the boiler can be viewed as a single circuit that operates alter- natively either for heating or for the production of domestic hot water. Said hydraulic circuit is divided into two sub-circuits, the heating sub-circuit, connected to the heat exchanger in the combustion chamber (primary heat exchanger) and the sub-circuit for the production of domestic hot water connected to a secondary heat exchanger, which exchanges thermal energy between the primary and cold water coming from the water supply mains.

Compatibly with the circuits described and to produce the connections, for example, with a domestic heating and hot water system, in the lower part of a boiler there are, for example, provided :

- connector means on the boiler side for connection of a gas supply duct, relative to corresponding connector means on the system side, fixed to the wall and forming part of the town gas supply system;

- connector means on the boiler side for connection of a domestic hot water outlet duct, relative to corresponding connector means on the system side, fixed to the wall and forming part of the domestic hot water hydraulic system;

- connector means on the boiler side for connection of a cold water inlet duct, relative to corresponding connector means on the system side, fixed to the wall and forming part of the cold water hydraulic system; - connector means on the boiler side for connection of a hot water outlet duct corre- sponding to the delivery side of the heating system, relative to corresponding connec- tor means on the system side, fixed to the wall and forming, for example, part of the domestic heating system;

- connector means on the boiler side for connection of a hot water return duct of the heating system, relative to corresponding connector means on the system side, fixed to the wall and forming, for example, part of the domestic heating system.

The aforesaid connector means on the system side are arranged under and, where possible, at a short distance from the boiler.

In particular, the aforesaid connector means have connecting threaded connections with vertical axes and have standard sizes, 3/4" for the gas and the heating system, and 1/2" for the domestic hot water.

Often, the threaded connections of the connector means on the boiler side have differ- ent positions relative to the corresponding threaded connections of the connector means on the system side. In particular, the vertical axes of the threaded connections of the connector means on the boiler side can be staggered relative to the axes of the corresponding threaded connections of the connector means on the system side, ac- cording to respective planes orthogonal and/or parallel to the face of the wall on which the boiler is fixed.

Therefore, the connection ducts arranged between said connections of the connector means on the boiler side and on the system side, which are formed of ducts with re- lated connector means, must be adapted and positioned according to the particular needs of each case, and at times take relative arrangements that make connection of the connector means relative to the corresponding connector means on the boiler side and on the system side difficult.

This fact often causes difficulties in the installation of a wall-mounted boiler, resulting in considerable technical and financial expenditure.

Moreover, often the installation thus produced has an untidy arrangement of exposed ducts under the wall-mounted boiler, resulting in an appearance that is aesthetically inadequate for the domestic environment.

Furthermore, the aforesaid untidy arrangement of ducts often does not allow all the components that can be useful to facilitate servicing and maintenance of the system and of the boiler to be inserted in the space below the boiler.

Technical problem In the production of a hydraulic system branched from a wall-mounted boiler, there is the need to rationalize installation of the boiler relative to the system and to be able to insert, in the space below the boiler, all the components required, so as to facilitate servicing and maintenance of the system and of the boiler, and to make the aforesaid space below the boiler aesthetically pleasing.

Completely satisfactory solutions for the solution of the aforesaid technical problem are not known.

The documents W02006/059208 Al, FR 2 813 658 A3 and EP 1 243 868 A2 relate to a connection device of a wall-mounted boiler relative to a domestic hot water/heating hydraulic system and related gas system. Nonetheless, they do not offer a satisfactory solution to the aforesaid technical problem.

Starting from the notion of this technical problem, the present invention intends to provide a simple and practical solution.

In particular, the present invention intends to provide a method and related device for connection of a wall-mounted boiler relative to a domestic hot water/heating hydraulic system and related gas system, which allows the following needs to be satisfied :

- facilitate installation of the connections between boiler and system;

- reduce the installation times of the connections;

- group together and provide the operator with all the components required for correct technical connection between boiler and system;

- in particular, allow the operator to arrange off site and in a convenient and easy manner, in the form of a pre-assembled device, all the means required for correct technical connection between boiler and system;

- make it possible for the operator to connect tools to service the system and the boiler;

- facilitate and speed up flushing of the winter heating system and of the primary and secondary circuit of the boiler;

- make it adaptable to all types of new generation wall-mounted boilers;

- protect the boiler from impurities and ferrous debris;

- comply with energy efficiency regulations;

- facilitate disposal of the condensate produced by the boiler;

- improve the aesthetic appearance by enabling all the components required for con- nection of the boiler to be covered.

The object of the present invention is to provide a method and a device for connecting a wall-mounted boiler relative to a hydraulic hot water and/or heating system, and op- tionally relative to a town gas system, which allows rationalization of installation of the boiler relative to the system and insertion, in the space below the boiler, of all the components required, so as to facilitate servicing and maintenance of the system and of the boiler, and to make the aforesaid space below the boiler aesthetically pleasing.

In view of these object, the present invention provides a method for connecting a wall-mounted boiler relative to a hydraulic hot water and/or heating system, and op- tionally relative to a town gas system, wherein in the lower part of said wall-mounted boiler there are provided connector means for connection to corresponding hydraulic ducts, and optionally to a corresponding pneumatic gas duct, fixed to the wall, below said connector means of said wall-mounted boiler and forming part of a hydraulic sys- tem, and optionally of a town gas supply system, of a building or the like, comprising the steps of:

- providing a plurality of hydraulic duct means, and optionally of pneumatic duct means;

- providing at least one auxiliary hydraulic means for a wall-mounted boiler, belonging to the class of filter and/or doser and/or pump auxiliary hydraulic means for a wall- mounted boiler, and connecting said at least one auxiliary hydraulic means with a re- spective of said plurality of hydraulic duct means; characterized in that it comprises the steps of:

- providing support means, including at least two support elements configured to at least partially support between them said plurality of hydraulic duct means, and op- tionally said pneumatic duct means, in a position below and in an arrangement re- spectively corresponding axially to at least some of said connector means provided in the lower part of said boiler, and to contain, between said at least two support ele- ments, said at least one auxiliary hydraulic means, connected with a respective hy- draulic duct means of said plurality of hydraulic duct means;

- at least partially arranging said plurality of duct means between said at least two support elements, respectively in an arrangement axially corresponding to at least some of said connector means provided in the lower part of said boiler, and arranging between said at least two support elements said at least one of said plurality of auxil- iary hydraulic means, connected with a respective of said hydraulic duct means;

- providing stable retaining means and stably retaining by means of said stable re- taining means, relative to said at least two support elements, said plurality of hydrau- lic duct means, and optionally said pneumatic duct means, wherein each duct means of said plurality of hydraulic duct means, and optionally said pneumatic duct means, are axially aligned with a respective of said connector means provided in the lower part of said boiler;

- producing the hydraulic connection, optionally the pneumatic connection, with re- spective connector means provided in the lower part of said boiler, of said plurality of hydraulic duct means, and optionally of said pneumatic duct means;

- providing stable covering means, at least at the front part of said boiler, of said plu- rality of hydraulic duct means, and optionally of said pneumatic duct means, and of said at least one auxiliary hydraulic means;

- arranging said stable covering means at least at the front part of said boiler.

The method according to the invention can comprise further the following steps con- sisting in :

- configuring said support means as at least one frame having at least two horizontal crosspieces, wherein said two horizontal crosspieces form said at least two support elements;

- at least partially arranging and stably retaining said plurality of hydraulic duct means, optionally said pneumatic duct means, relative to said at least two crosspieces of said at least one frame, and arranging between said two crosspieces said at least one of said plurality of auxiliary hydraulic means, connected with a respective of said hydraulic duct means, producing a device pre-assembled for the hydraulic, and op- tionally pneumatic, connection of said hydraulic duct means, optionally pneumatic duct means, relative to said connector means of said wall-mounted boiler and relative to a corresponding hydraulic hot water and/or heating system, and optionally relative to a corresponding town gas system;

- fixing said device pre-assembled under said boiler and producing the hydraulic, and optionally pneumatic, connection of said hydraulic duct means, optionally pneumatic duct means, relative to said connector means of said wall-mounted boiler, on the one side, and, on the other side, relative to a corresponding hydraulic hot water and/or heating system, and optionally relative to a corresponding town gas system.

The method according to the invention can comprise also the following steps:

- providing said support means with adjustment means of the axial arrangement of each hydraulic duct means of said plurality of hydraulic duct means, and optionally of said pneumatic duct means, relative to a respective of said connector means of said boiler, in at least a plane containing the respective axes;

- at least partially arranging said plurality of hydraulic duct means, optionally said pneumatic duct means, between said support means; - adjusting by means of said adjustment means the axial arrangement of each hy- draulic duct means of said plurality of hydraulic duct means, and optionally of said pneumatic duct means, relative to a respective of said connector means of said wall- mounted boiler, in at least a plane containing the respective axes;

- at least partially stably retaining said plurality of hydraulic duct means, optionally said pneumatic duct means, relative to said at least two support elements, by means of said stable retaining means, in the respective axial arrangement adjusted by means of said adjustment means.

Further, to reach said object, the present invention provides a device for connecting a wall-mounted boiler relative to a hydraulic hot water and/or heating system, and op- tionally relative to a town gas system, wherein in the lower part of said wall-mounted boiler there are provided connector means for connection to corresponding hydraulic ducts, and optionally to a corresponding pneumatic gas duct, fixed to the wall, below said connector means of said wall-mounted boiler and forming part of a hydraulic sys- tem, and optionally of a town gas supply system, of a building or the like, comprising a plurality of hydraulic duct means, and optionally of the pneumatic duct means, and at least one auxiliary hydraulic means for a wall-mounted boiler, belonging to the class of auxiliary hydraulic filter and/or doser and/or pump means for a wall-mounted boiler, wherein said at least one auxiliary hydraulic means is connected with a respec- tive of said plurality of hydraulic duct means, characterized in that it.comprises:

- support means, including at least two support elements, configured to at least par- tially support between them said plurality of hydraulic duct means, and optionally said pneumatic duct means, in a position below and in an arrangement respectively corre- sponding axially to at least some of said connector means provided in the lower part of said boiler, and to contain, between said at least two support elements, said at least one auxiliary hydraulic means, connected with a respective hydraulic duct means of said plurality of hydraulic duct means;

- stable retaining means, relative to said at least two support elements, of said plural- ity of hydraulic duct means, and optionally of said pneumatic duct means, wherein each duct means of said plurality of hydraulic duct means, and optionally said pneu- matic duct means, are axially aligned with a respective of said connector means pro- vided in the lower part of said boiler;

- stable covering means, provided at least at the front part of said boiler, of said plu rality of hydraulic duct means, and optionally of said pneumatic duct means, and of said at least one auxiliary hydraulic means. Further, in the device according to this invention, said support means are configured as at least one frame having at least two horizontal crosspieces, wherein said two horizontal crosspieces provide said at least two support elements of said plurality of hydraulic duct means, and optionally said pneumatic duct means, wherein said plural- ity of hydraulic duct means, optionally said pneumatic duct means, at least partially stably retained relative to said two crosspieces of said at least one frame, and said at least one auxiliary hydraulic means, arranged between said two crosspieces and con- nected with a respective of said hydraulic duct means, provide a device pre-assembled for the hydraulic, and optionally pneumatic, connection of said hydraulic duct means, optionally pneumatic duct means, relative to said connector means of said wall- mounted boiler and relative to a corresponding hydraulic hot water and/or heating system, and optionally relative to a corresponding town gas system.

Further, said support means are provided with adjustment means of the axial ar- rangement of each hydraulic duct means of said plurality of hydraulic duct means, and optionally of said pneumatic duct means, relative to a respective of said connector means of said wall-mounted boiler, in at least a plane containing the respective axes. Other characteristics and advantages of the invention will be apparent from the follow- ing detailed description of an example of embodiment with reference to the accompa- nying drawing, which shows important details for the invention, and from the claims. The features illustrated are not necessarily to scale and are represented so that the specific features according to the invention are clearly highlighted. The different fea- tures can be produced individually or in any combination with one another, as variants of the invention.

In the accompanying drawing :

- Fig. 1 is a schematic and partially vertical sectional view of the device according to the invention represented in an arrangement for connecting a wall-mounted boiler relative to a domestic hot water/heating hydraulic system and related gas system, wherein said boiler and said device are both represented recessed into a wall viewed in a sectional view;

- Fig. 2 is a view similar to that of Fig. 1, but in which the boiler is represented as fixed on the outer surface of the wall;

- Fig. 3 is a view similar to that of Fig. 1, but in which both the boiler and the device according to the invention are represented as fixed on the outer surface of the wall;

- Fig. 4 is a front elevation view in the direction of the arrow IV of Fig. 1; - Fig. 5 is a front elevation view in the direction of the arrow V of Fig. 2;

- Fig. 6 is a front elevation view in the direction of the arrow VI of Fig. 3, in which the hydraulic circuit and gas connections of the boiler are represented vertically aligned with corresponding connections of the hydraulic and gas systems fixed to the wall;

- Fig. 7 is a view similar to that of Fig. 6, but in which the hydraulic circuit and gas connections of the boiler are represented vertically unaligned with the corresponding connections of the hydraulic and gas systems fixed to the wall;

- Fig. 8 is a sectional view in an enlarged scale along the line VIII-VIII of Fig. 1, illus trating a first example of embodiment of the device according to the invention;

- Fig. 9 is a sectional view along the line IX-IX of Fig. 8;

- Fig. 10 is a view in the direction of the arrow X of Fig. 8;

- Fig. 11 is a top plan view of the device according to a second example of embodi- ment of the invention not installed relative to a boiler and related system;

- Fig. 12 is a bottom plan view of the device according to Fig. 11;

- Fig. 13 is a sectional view along the line XIII-XIII of Fig. 11;

- Fig. 14 is a partial detail view in an enlarged scale, in the direction of the arrow XIV of Fig. 3, illustrating the device of Fig. 11 installed relative to a boiler and related sys- tem;

- Fig. 15 is a detail view, in an enlarged scale, of the detail XV of Fig. 14;

- Fig. 16 is a vertical sectional view of the device according to a third example of em- bodiment of the present invention, not installed relative to a boiler and related sys- tem;

- Fig. 17 is a view in the direction of the arrow XVII of Fig. 16, showing a plurality of telescoping arm support means for respective tubular members;

- Figs. 18 is a sectional view along the line XVIII-XVIII of Fig. 16;

- Fig. 19 is a partial detail view showing a variant of embodiment of the device accord- ing to Figs. 16 to 18, in which a plurality of support means for respective tubular members are produced in the form of articulated arms by means of cylindrical hinges with vertical axes;

- Fig. 20 is a sectional view along the line XX-XX of Fig. 19;

- Fig. 21 is a detail view, with part broken away, in the direction of the arrow XXI of Fig. 9;

- Fig. 22 is a view similar to that of Fig. 8, but illustrating a fourth example of em- bodiment of the device according to the invention;

- Fig. 23 is a view in the direction of the arrow XXIII of Fig. 22. First example of embodiment of the invention (Figs. 1. 4. 8. 9. 10 and 211

The reference Cl (Figs. 1 and 4) indicates a wall-mounted boiler, which is connected relative to a domestic hot water and heating hydraulic system II and related gas sys- tem, by means of the connection device of the present first example of embodiment of the invention, indicated with 10.1.

Said boiler Cl is recessed in the wall PI as is the system II, although the recessing depths are different. Boiler Cl and System II project relative to the front face of the wall PI.

To produce the connections with the, for example, domestic heating and hot water system II, in the lower part of the boiler Cl there are, for example, provided :

- connector means on the boiler side RC1 for connection of a gas supply duct, relative to corresponding connector means on the system side (not illustrated) fixed to the wall and forming part of the town gas supply system;

- connector means on the boiler side RC2 for connection of a domestic cold water inlet duct, relative to corresponding connector means on the system side RI2 fixed to the wall and forming part of the cold water hydraulic system;

- connector means on the boiler side RC3 for connection of a domestic hot water outlet duct, relative to corresponding connector means RI3 on the system side fixed to the wall and forming part of the domestic hot water hydraulic system;

- connector means on the boiler side RC4 for connection of a hot water outlet duct corresponding to the delivery side of the heating system, relative to corresponding connector means on the system side RI4 fixed to the wall and forming, for example, part of the domestic heating system;

- connector means on the boiler side RC5 for connection of a water return duct, rela- tive to corresponding connector means on the system side RI5 fixed to the wall and forming, for example, part of the domestic heating system.

The free ends of the aforesaid connector means on the system side RI2, RI3, RI4, RI5 are arranged under and at a distance from the boiler Cl and, as illustrated by way of example in Fig. 1, have their axes vertical and arranged in a common vertical plane, both relative to one another and relative to the vertical axes of the free ends of the connector means above on the boiler side RC2, RC3, RC4 and RC5. Moreover, also the axis of the free end of the connector RC1 for connection of a gas supply duct is vertical and coplanar with the axes of the ends of the aforesaid other connectors. Moreover, according to the present example of embodiment, the free ends of the pairs of opposite connector means RC2/RI2, RC3/RI3, RC4/RI4, RC5/RI5 are substantially coaxial with each other.

Instead, the mutual distance between the vertical axes of the free ends of said pairs of connector means RC2/RI2, RC3/RI3, RC4/RI4, RC5/RI5 is not constant, when consid- ering the axes adjacent two by two.

Said free ends of the connector means on the boiler side RC1, RC2, RC3, RC4 and RC5, and the free ends of the connector means on the system side RI2, RI3, RI4, RI5 are externally threaded according to predetermined pitches.

According to the present invention, between the connector means RC1, RC2, RC3, RC4 and RC5 of the boiler Cl and the connector means RI2, RI3, RI4, RI5 of the system II there is provided said connection device 10.1, which essentially comprises (see in par- ticular Fig. 8) :

- a support 11.1, fixed to the wall PI on which said boiler Cl is mounted, arranged be- tween said connector means RC1, RC2, RC3, RC4, RC5 on the boiler side and said connector means RI2, RI3, RI4, RI5 on the system side, wherein said support 11.1 is configured as a rectangular frame, for example made of metal, having :

- an essentially horizontal upper crosspiece 11.1a close to all the threaded free ends of the connector means above on the boiler side RC1, RC2, RC3, RC4 and RC5, and

- an essentially horizontal lower crosspiece 11.1b close to all the threaded free ends of the connector means below on the system side RI2, RI3, RI4, RI5;

- upper rectilinear guide means 12.1a provided in said upper crosspiece 11.1a, wherein said upper rectilinear guide means 12.1a are configured as an upper slotted hole corresponding to all the threaded free ends of the connector means above on the boiler side RC1, RC2, RC3, RC4 and RC5 and whose major axis extends for a substan- tial part of said crosspiece 11.1a, according to a vertical plane essentially parallel to the plane containing the vertical axes of said connector means on the boiler side RC1, RC2, RC3, RC4 and RC5 and of said connector means on the system side RI2, RI3, RI4, RI5;

- lower rectilinear guide means 12.1b provided in said lower crosspiece 11.1b, wherein said lower rectilinear guide means 12.1b are configured as a lower slotted hole corre- sponding to all the threaded free ends of the connector means below on the system side RI2, RI3, RI4, RI5 and whose major axis extends for a substantial part of said crosspiece 11.1b, according to a vertical plane essentially parallel to the plane contain- ing the vertical axes of said connector means on the boiler side RC1, RC2, RC3, RC4, RC5 and of said connector means on the system side RI2, RI3, RI4, RI5;

- connection hydraulic duct means CA2, CA3, CA4, CA5, having respective essentially vertical axes and respective threaded free ends, respectively extending beyond said upper crosspiece 11.1a and said lower crosspiece 11.1b, through said corresponding upper 12.1a and lower 12.1b slotted holes, wherein said threaded free ends are pro- vided with corresponding threaded connector means (not illustrated) for connection relative to said connector means on the boiler side and said connector means on the system side;

- connection pneumatic duct means CGI having an essentially vertical axis and at least one threaded free end, extending beyond said upper crosspiece 11.1a, through said upper slotted hole 12.1a, while another lower free end is contained inside said frame support 11.1, wherein said upper threaded free end is provided with corre- sponding threaded connector means (not illustrated) for connection relative to said connector means on the boiler side;

- stable retaining means of each of said connection hydraulic duct means CA2, CA3, CA4, CA5, comprising, at each threaded free end of said duct means, a pair of mount- ing nuts, respectively upper and lower, DA21, DA22; DA31, DA32; DA41, DA42; DA51, DA52, juxtaposed and clamped against the two opposite faces (inner and outer) of said upper crosspiece 11.1a and of said lower crosspiece 11.1b, respectively;

- stable retaining means of said connection pneumatic duct means CGI, comprising at said upper threaded free end of said duct means a pair of internally threaded mount- ing nuts DA11, juxtaposed and clamped against the two opposite faces (inner and outer) of said upper crosspiece 11.1a;

- at least front covering means 13.1 of said hydraulic duct means, and of said pneu- matic duct means, retained relative to said support means 11.1 in an arrangement corresponding to at least some of said connector means provided in the lower part of said boiler.

The connection device 10.1 described above makes it possible to:

- easily implement the relative stable arrangement of the connection hydraulic duct means CA2, CA3, CA4, CA5 in the support 11.1, through placing of said duct means in the suitable position, with free ends passing through the respective upper 12.1a and lower 12.1b slotted holes, and clamping of the respective pairs of mounting nuts, up- per and lower, DA21, DA22; DA31, DA32; DA41, DA42; DA51, DA52 against the cor- responding crosspieces 11.1a, 11.1b of the frame support 11.1; - easily implementing the relative stable arrangement of the connection pneumatic duct CGI relative to the connection hydraulic ducts CA2, CA3, CA4, CA5 in the support 11.1, through arranging said duct in the suitable position, with upper free end passing through the upper slotted hole 12.1a and clamping of the respective pair of mounting nuts DAI 1 against the corresponding upper crosspiece 11.1a;

- finely adjusting the mutual distance between the vertical axes of said connection duct means CA2, CA3, CA4, CA5, and CGI, before performing clamping of the respec- tive pairs of mounting nuts, in relation to the arrangement of the connector means RC2/RI2, RC3/RI3, RC4/RI4, RC5/RI5 on the boiler side and on the system side and to the connector means on the system side (not illustrated) fixed to the wall of the town gas supply system, wherein said adjustment is implemented on a common vertical plane on which the vertical axes of said connection ducts and of the corresponding threaded free ends of said connector means are arranged.

Moreover, it can be noted that:

- said duct means CA4, which produce the hydraulic sealed connection between the connector means on the boiler side RC4 (which provide the hot water outlet for the heating system) relative to the corresponding connector means on the system side RI4, are provided with respective shut-off valve means V8, VI each configured as a gate valve and arranged respectively in proximity of said connector means on the boiler side RC4 and of said connector means on the system side RI4. Said shut-off valve means V8, VI respectively have a threaded connection for connecting mainte- nance machinery on the heating water delivery pipe from the boiler to the system; each threaded connection is protected by a corresponding threaded cap V8.1 (Fig. 21);

- said duct means CA3, which produce the hydraulic sealed connection between the connector means on the boiler side RC3 (which provide the hot water outlet for the domestic hot water system) relative to the corresponding connector means on the system side RI3, are provided with respective shut-off valve means V2, V7, each con- figured as a gate valve and arranged respectively in proximity of said connector means on the boiler side RC3 and of said connector means on the system side RI3. Said shut-off valve means V7, V2 respectively have a threaded connection for con- necting maintenance machinery on the domestic hot water delivery pipe from the boiler to the system; each threaded connection is protected by corresponding threaded cap; - said duct means CA2, which produce the hydraulic sealed connection between the connector means on the boiler side RC2 (which provide the water inlet for the domes- tic hot water system) relative to corresponding connector means on the system side RI2, are provided with respective shut-off valve means V5, V3, each configured as a gate valve and arranged respectively in proximity of said connector means on the boiler side RC2 and of said connector means on the system side RI2. Said shut-off valve means V3, V5 have respectively a threaded connection for connecting mainte- nance machinery on the domestic hot water inlet pipe from the system to the boiler; each threaded connection is protected by a corresponding threaded cap;

- said duct means CA5, which produce the hydraulic sealed connection between the connector means on the boiler side RC5 (which provide the water return for the heat- ing system) relative to the corresponding connector means on the system side RI5, are provided with respective shut-off valve means V4, configured as a gate valve and arranged in proximity of said connector means on the system side RI5. Said shut-off valve means V4 have a threaded connection for connecting maintenance machinery on the water return pipe from the heating system to the boiler; said threaded connection is protected by a corresponding threaded cap;

- said duct means CGI, which produce the pneumatic sealed connection of the con- nector means on the boiler side RC1 (which provide the gas inlet for the boiler Cl) relative to the corresponding connector means on the town gas system side (not illus- trated), are provided with respective shut-off valve means V6 configured as a gate valve. Said shut-off valve means V6 have a threaded connection for connecting control and maintenance machinery on the town gas supply pipe; said threaded connection is protected by a corresponding threaded cap.

Moreover, it can be noted that:

- said duct means CA5, which produce the hydraulic sealed connection between the connector means on the boiler side RC5 (which provide the water return for the heat- ing system) relative to the corresponding connector means on the system side RI5, are provided with respective magnetic dirt separator means DF to retain the impurities returning from the system (alternatively, in cases in which a dirt separator is not re- quired, a simple magnet or a filter can be fitted);

- said duct means CA2, which produce the hydraulic sealed connection between the connector means on the boiler side RC2 (which provide the water inlet for the domes- tic hot water system) relative to the corresponding connector means on the system side RI2, are provided with polyphosphate dosing means DP to form a protective film of the pipes and keep the limescale in suspension (alternatively, a magnetic descaler can be fitted);

- pump means P9 to discharge condensate, with related safety valves, are further pro- vided, to compensate for the lack of a discharge pipe in close proximity of the boiler Cl.

It can be noted that said magnetic descaler means DF, said polyphosphate dosing means DP and said condensate discharge pump means P9 are contained inside said support 11.1, both in the sense of height and of width.

Moreover, a removable cover 13.1 (Figs. 1 and 4) is provided to cover, at least fron- tally, said hydraulic / pneumatic duct means housed in said frame support 11.1, and said magnetic descaling means DF, said polyphosphate dosing means DP and said pump means P9. Said cover 13.1 is configured as a sheet metal hood that engages by snap fitting onto said support 11.1 fixed to the wall.

Brief explanation of the use of the above described valve means provided in the con- nection device 10.1, relative to maintenance machinery operatively connected by means of said valve means.

HEATING SYSTEM flushing :

- close the valves VI, V4 and V8,

- unscrew the cap on the valves VI and V4,

- connect suitable machinery to the valves VI and V4,

- open the valves VI, V4,

- flush by means of the machine, close the valves VI, V4 and disconnect the machine,

- tighten the previously disconnected caps and

- open the valves VI, V4 and V8.

BOILER SECONDARY HEAT EXCHANGER flushing:

- close the valves V2, V3, V5 and V7,

- unscrew the caps on the valves V5 and V7,

- connect suitable machinery to the valves V5 and V7,

- open the valves V5, V7,

- flush by means of the machine, close the valves V5, V7 and disconnect the machine,

- tighten the previously disconnected caps and

- open the valves V2, V3, V5 and V7;

BOILER PRIMARY HEAT EXCHANGER flushing :

- close the valves VI, V4 and V8,

- unscrew the caps on valves V4 and V8, - connect suitable machinery to the valves V4 and V8,

- open the valves V4, V8,

- flush by means of the machine, close the valves V4, V8 and disconnect the machine,

- tighten the previously disconnected caps and

- open the valves VI, V4 and V8.

DOMESTIC HOT WATER SYSTEM flushing :

- close the valves V2, V3, V5 and V7,

- unscrew the caps on the valves V2 and V3,

- connect suitable machinery to the valves V2 and V3,

- open the valves V2, V3,

- flush by means of the machine, close the valves V2, V3 and disconnect the machine,

- tighten the previously disconnected caps and

- open the valves V2, V3, V5 and V7.

PROTECTIVE CHARGING AND SYSTEM DISCHARGE by the valves VI and V4.

Discharge can also be implemented by all the valves according to requirements.

Moreover, the valve V3 can also be used as water intake.

It can be noted that the aforesaid valve means VI, V2, V3, V4, V5, V6, V7, V8 are configured as three-way valve comprising a ball, inner channels to direct the flow and screw closing cap on the fluid inlet/outlet.

It can also be noted that the connection device 10.1 according to the invention can comprise a flow meter hydraulically connected on the domestic cold water inlet pipe in the boiler, upstream of the polyphosphate doser, the purpose of which is to measure the inflowing water: said flow meter is electrically connected relative to a board (re- settable and settable) with power supply at 220 or 12 V, so that, by setting the dosing capacity of said polyphosphate doser, the charge status of the doser is indicated, for example by a colored LED, for example visible on the outer cover 13.1. For example, green LED when the doser is fully charged, yellow LED when the doser charge is low and red LED when the doser charge is completely exhausted.

Moreover, the connection device 10.1 according to the invention can comprise a sole- noid valve to shut off the gas on the gas pipe, electrically connected by means of a sensor located outside the support 11.1 (for example, in the immediate vicinity), to detect: any fuel leaks and/or carbon monoxide (CO) presence and shut off the power supply to the solenoid valve and the gas supply, switching off the boiler with notifica- tion of the error for fault status thereof.

It can also be noted that the connection device 10.1 according to the invention: - in case of outdoor installation, can be provided with frost protection means with settable temperature;

- the valve means VI, V2, V3, V4, V5, V6, V7, V8 can be provided with a cap with in- tegrated thermometer or gauge, for visual control of the right pressures and tempera- tures of the liquids inside the system.

It can be noted that said hydraulic duct means and said pneumatic duct means are provided with corresponding connector means (well-known per se and not illustrated) for hydraulic, respectively pneumatic, connection with said connector means provided in the lower part of said boiler and in said system.

Boiler C2 and related system 12 according to Figs. 2 and 5

In this example, a wall-mounted boiler C2 is mounted on and projects relative to a wall P2, while the corresponding system 12 is recessed relative to the front face of said wall P2. Considering this relative arrangement, the present invention provides the connection device 10.2, which is identical to the connection device 10.1 described above, as in any case the threaded free ends of the connector means on the boiler side RC2, RC3, RC4 and RC5, and the respective threaded free ends of the connector means on the system side RI2, RI3, RI4, RI5 are mutually coaxial two by two accord- ing to respective common vertical axes.

The reference numeral 13.2 indicates a removable front cover of the connection device 10.2.

Second example of embodiment of the connection device of the invention (Figs. 3, 6,

7, 11, 12, 13, 14, 15)

In this example of embodiment, a wall-mounted boiler C3 is mounted on and projects relative to the front face of a wall P3 and also the free ends of the respective connec- tor means of a corresponding system 13 project relative to the front face of said wall P3.

In this arrangement, the reference numerals 3RC2, 3RC3, 3RC4 and 3RC5 indicate connector means provided in the boiler C3 and 3RI2, 3RI3, 3RI4, 3RI5 indicate the corresponding connector means provided in the system 13 (see, in particular, Fig. 6).

It can be noted that the opposite pairs of the threaded free ends of said connector means on the boiler side and on the system side 3RC2/3RI2, 3RC3/3RI3, 3RC4/3RI4 and 3RC5/3RI5, respectively, are coaxial to each other according to a common vertical axis. On the other hand, the common vertical axes of said opposite pairs of threaded free ends of the connector means on the boiler side and on the system side 3RC2/3RI2, 3RC3/3RI3, 3RC4/3RI4 and 3RC5/3RI5 do not belong to a single vertical plane, substantially parallel to the front face of the wall P3. As can be seen, for exam- pie, in Fig. 3, the two vertical axes of the two opposite pairs of threaded free ends of the connector means on the boiler side and on the system side 3RC3/3RI3 and 3RC4/3RI4 are staggered from each other and lie in different vertical planes parallel to the front face of the wall P3. In the same way, the vertical axes of the other opposite pairs of threaded free ends of the connector means on the boiler side and on the sys- tem side lie in different vertical planes parallel to the front face of the wall P3 and said axes are thus staggered from each other in different vertical planes relative to said front face of the wall P3. Moreover, the mutual distances of said axes also vary.

In this example of embodiment, the connection device of the invention is indicated as a whole with 10.3 (Figs. 3, 6) and essentially comprises (see also Figs. 11 to 15) :

- a support 11.3, fixed to the front face of the wall P3 on which said boiler C3 is mounted between said hydraulic connector means 3RC2, 3RC3, 3RC4, 3RC5 on the boiler side and said connector means 3RI2, 3RI3, 3RI4, 3RI5 on the system side, and between pneumatic connector means (not illustrated) for the town gas duct on the boiler side and on the system side, wherein cui said support 11.3 is configured as rec- tangular frame, for example made of metal, having :

- an essentially horizontal upper crosspiece 11.3a close to the threaded free ends of the connector means above on the boiler side 3RC1, 3RC2, 3RC3, 3RC4 and 3RC5, wherein said crosspiece 11.3a has a wide central opening 11.3al, extending substantially for the whole of its length and corresponding to all said threaded free ends of the connector means above on the boiler side, and two continuous linear op- posite lateral edges 11.3all, 11.3al2 delimiting said opening 11.3al and wherein, in each of said two opposite lateral edges 11.3a 11, 11.3a 12, there are respectively pro- vided five slotted holes 11.3al ll and 11.3al21 whose major axis is contained in a plane essentially parallel to the front face of said wall P3, each slotted hole 11.3bl21 of the lateral edge 11.3al2 being opposite a respective slotted hole 11.3bll l of the other lateral edge 11.3al l;

- an essentially horizontal lower crosspiece 11.3b close to the threaded free ends of the connector means below on the system side 3RI2, 3RI3, 3RI4, 3RI5, wherein said crosspiece 11.3b has a wide central opening 11.3bl, extending substan- tially for the whole of its length and corresponding to all said threaded free ends of the connector means below on the system side, and two continuous linear opposite lateral edges 11.3bl l, 11.3bl2 delimiting said opening 11.3bl and wherein, in each of said two opposite lateral edges 11.3bll, 11.3bl2, there are respectively provided five slot- ted holes 11.3bl ll and 11.3bl21 whose major axis is contained in a plane essentially parallel to the front face of said wall P3, each slotted hole 11.3bl21 of the lateral edge 11.3bl2 being opposite a respective slotted hole 11.3bll l of the other lateral edge 11.3bll;

- rectilinear upper guide means 12.3al, 12.3a2, 12.3a3, 12.3a4, 12.3a5 comprising, for each of said connector means on the boiler side 3RG1 (connector means of the gas duct), 3RC2, 3RC3, 3RC4 and 3RC5, a respective moving plate juxtaposed relative to said two opposite lateral edges 11.3all, 11.3al2 of said upper crosspiece 11.3a and bridging said upper central opening 11.3al, wherein said upper plate guide means 12.3al, 12.3a2, 12.3a3, 12.3a4, 12.3a5 comprise a respective upper slotted hole 12.3all, 12.3a21, 12.3a31, 12.3a41, 12.3a51, extending for a substantial part of said upper central opening 11.3al and whose major axis is contained in an essentially ver- tical plane orthogonal relative to the front face of said wall P3;

- rectilinear lower guide means 12.3bl, 12.3b2, 12.3b3, 12.3b4, 12.3b5 comprising, for each of said connector means on the system side 3RI2, 3RI3, 3RI4, 3RI5, and for connector means of the town gas duct on the system side (not illustrated), a respec- tive moving plate juxtaposed relative to said two opposite lateral edges 11.3bl l, 11.3bl2 of said lower crosspiece 11.3b and bridging said lower central opening 11.3bl, wherein said lower plate guide means 12.3bl, 12.3b2, 12.3b3, 12.3b4, 12.3b5 comprise a respective lower slotted hole 12.3bll, 12.3b21, 12.3b31, 12.3b41, 12.3b51, whose major axis is contained in an essentially vertical plane orthogonal to said front face of said wall P3 and extends for a substantial part of said lower central opening 11.3bl;

- means for the removable fixing of said upper plate guide means 12.3al, 12.3a2, 12.3a3, 12.3a4, 12.3a5 relative to said opposite lateral edges 11.3all, 11.3al2 of said upper crosspiece 11.3a, wherein said fixing means are configured as respective screw means and related lock nut that engage said five slotted holes 11.3al ll and 11.3al21 of said opposite lateral edges 11.3al l and 11.3al2, respectively;

- means for the removable fixing of said lower plate guide means 12.3bl, 12.3b2, 12.3b3, 12.3b4, 12.3b5 relative to said opposite lateral edges 11.3bl l, 11.3bl2 of said lower crosspiece 11.3b, wherein said fixing means are configured as respective screw means and related lock nut that engage said five slotted holes 11.3bl ll and 11.3bl21 of said opposite lateral edges 11.3bl l and 11.3bl2, respectively;

- connection hydraulic duct means 3CA2, 3CA3, 3CA4, 3CA5, having respective essen- tially vertical axes and respective threaded free ends, extending respectively beyond said upper crosspiece 11.3a and said lower crosspiece 11.3b, through said upper slot- ted holes 12.3al l, 12.3a21, 12.3a41, 12.3a51 and said lower slotted holes 12.3bll, 12.3b21, 12.3b41, 12.3b51 of corresponding opposite pairs of said upper 12.3al, 12.3a2, 12.3a4, 12.3a5 and lower 12.3bl, 12.3b2, 12.3b4, 12.3b5 plate guide means, respectively;

- connection pneumatic duct means 3CG1 having an essentially vertical axis and an upper threaded free end, extending beyond said upper crosspiece 11.3a, through said upper slotted hole 12.3a31 of said upper plate guide means 12.3a3, and a lower free end, extending beyond said lower crosspiece 11.3b, through said lower slotted hole 12.3b31 of said lower plate guide means 12.3b3;

- stable retaining means of each of said connection hydraulic duct means 3CA2, 3CA3,

3CA4, 3CA5, comprising at each of the two threaded free ends of said duct means 3CA2, 3CA3, 3CA4, 3CA5, which extend beyond a respective pair of upper and lower slotted holes 12.3all/12.3bl l, 12.3a21/12.3b21, 12.3a41/12.3b41,

12.3a51/12.3b51, a pair of internally threaded mounting nuts, respectively upper and lower, 3DA21'", 3DA22'"; 3DA41'", 3DA42'"; 3DA51'", 3DA52'", juxtaposed and clamped against the two opposite faces of respective upper and lower plate guide means 12.3al/12.3bl, 12.3a2/12.3b2, 12.3a4/12.3b4, 12.3a5/12.3b5e, respectively;

- stable retaining means of said connection pneumatic duct means 3CG1, comprising at each of the two threaded free ends of said duct means 3CG1, which extend beyond a respective pair of upper and lower slotted holes 12.3a31/12.3b31, a pair of inter- nally threaded mounting nuts, respectively upper and lower, 3DA31'", 3DA32'", juxta- posed and clamped against the two opposite faces of respective upper and lower plate guide means 12.3a3/12.3b3, respectively;

- at least front covering means 13.3 of said hydraulic duct means, and of said pneu- matic duct means, retained relative to said support structure 11.3 in an arrangement corresponding to at least some of said connector means provided in the lower part of said boiler.

As is evident from the foregoing, the connection device 10.3 described above allows all the functions explained with reference to the connection device 10.1 of the first embodiment of the invention to be implemented.

Moreover, said connection device 10.3 allows correct and stable relative arrangement of the threaded free ends of the connection hydraulic duct means 3CA2, 3CA3, 3CA4, 3CA5 relative to the corresponding connector means 3RC2, 3RC3, 3RC4 and 3RC5 on the boiler side and 3RI2, 3RI3, 3RI4, 3RI5 on the system side, and of the threaded free ends of the connection pneumatic duct means 3CG1 relative to the pneumatic connector means on the boiler side 3RC1 and on the system side, by means of ad- justment, during assembly, of the position of each of the respective vertical axes si- multaneously according to two vertical planes essentially orthogonal to each other. This adjustment is implemented by moving each threaded free end of each connection duct 3CA2, 3CA3, 3CA4, 3CA5 and 3CG1 relative to the corresponding slotted hole of said plate guide means 12.3al, 12.3a2, 12.3a3, 12.3a4, 12.3a5 and 12.3bl, 12.3b2, 12.3b3, 12.3b4, 12.3b5, and also moving said plate guide means relative to the corre- sponding rectilinear guide means 11.3all l and 11.3al21 and 11.3bl ll and 11.3bl21 provided along the upper and lower crosspieces of said fixed support. When the cor- rect relative arrangement of each threaded free end of each connection duct is in this given mode, the end is fixed by means of clamping of said fixing means and of said stable retaining means.

It can be noted that a removable cover 13.3 (Figs. 6, 7, 10) is provided to cover, at least frontally, said hydraulic / pneumatic duct means housed in said frame support 11.3. Said cover 13.3 is configured as a sheet metal hood that engages by snap fitting onto said support 11.3 fixed to the wall.

Variant of embodiment according to Fig. 7

Fig. 7 illustrates a case similar to that of Fig. 6, but in which the wall-mounted boiler is indicated with C3' and the opposite pairs of threaded free ends of said connector means on the boiler side and on the system side are indicated with 3RC273RI2', 3RC373RI3', 3RC473RI4' and 3RC573RI5', respectively, and said opposite pairs of free ends are not coaxial to each other according to a common vertical axis, as is evi- dent in said figure. The hydraulic connection of said opposite pairs of threaded free ends of said connector means on the boiler side and on the system side is imple- mented by means of flexible sealed pipes, indicated with dashed lines in said Fig. 7.

In this case, the device according to the invention, which in said Fig. 7 is not illus trated in detail, comprises only the following parts of the above described second em- bodiment (see for example Fig. 8) :

- a support structure 11.3 configured to support a plurality of connection hydraulic duct means 3CA2, 3CA3, 3CA4, 3CA5, and optionally of the connection pneumatic duct means (not illustrated), in an arrangement corresponding to at least some said con- nector means 3RC2', 3RC3', 3RC4' and 3RC5' provided in the lower part of said boiler C3',

- said plurality of hydraulic duct means 3CA2, 3CA3, 3CA4, 3CA5, and optionally of pneumatic duct means (not illustrated), at least partially corresponding to said con- nector means 3RC2', 3RC3', 3RC4' and 3RC5' provided in the lower part of said boiler C3', wherein said plurality of duct means is arranged in said support structure 11.3 in an arrangement corresponding to at least some of said connector means provided in the lower part of said boiler for hydraulic, optionally pneumatic, connection thereto,

- stable retaining means, in said support structure 11.3, of said hydraulic duct means, and optionally of said pneumatic duct means, in an arrangement corresponding to at least some of said connector means provided in the lower part of said boiler C3'; wherein said stable retaining means comprise (refer is made to said second embodi- ment of the invention) a pair of internally threaded mounting nuts, engaged on the threaded ends of said duct means, juxtaposed and clamped against the two opposite faces of respective upper plate guide means 12.3al, 12.3a2, 12.3a4, 12.3a5 respec- tively, which are in turn fixed, by means of fixing means relative to said opposite lat- eral edges 11.3al l, 11.3al2 of the upper crosspiece 11.3a of said support structure 11.3 configured as a frame;

- said front covering means 13.3 of said hydraulic duct means, and optionally of said pneumatic duct means, retained in said support structure 11.3 in an arrangement cor- responding to at least some of said connector means provided in the lower part of said boiler.

Third example of embodiment of the connection device of the invention (Figs. 16, 17 and 18)

Also in this example of embodiment, reference is made to a wall-mounted boiler, not represented, but identical to the boiler C3, which is mounted and projects relative to the front face of a wall, for example P3, and also the free ends of the respective con- nector means of a corresponding system, for example a system such as 13, project relative to the front face of said wall P3.

In this arrangement, the connector means (hydraulic and pneumatic) provided in the aforesaid boiler are not illustrated and nor are the corresponding connector means (hydraulic and pneumatic) provided in the respective system, but reference is none- theless made by way of example to the aforesaid boiler C3 and related System 13 for the relative arrangement of the respective connector means. Therefore, reference should be made to the foregoing description in this regard.

In this example of embodiment, the connection device of the invention is indicated as a whole with 10.4 (Figs. 16, 17 and 18) and essentially comprises:

- a support 11.4, fixed at a short distance relative to the front face of said wall P3 on which said boiler is mounted between said hydraulic connector means on the boiler side and said hydraulic connector means on the system side, and between pneumatic connector means for the town gas duct on the boiler side and on the system side, wherein said support 11.4 is configured as a rectangular frame, for example made of metal, having :

- an essentially horizontal upper crosspiece 11.4a, close to the threaded free ends of the connector means above on the boiler side, wherein said crosspiece 11.4a is structured as a metal profile with a quadrangular section;

- an essentially horizontal lower crosspiece 11.4b, close to the threaded free ends of the connector means below on the system side, wherein said crosspiece 11.4b is structured as a metal profile with a quadrangular section;

- rectilinear upper guide means 12.4al, 12.4a2, 12.4a3, 12.4a4, 12.4a5 corn- prising, for each of said connector means on the boiler side, a respective slider, formed by means of a corresponding length of metal pipe with a quadrangular section, engaged in prismatic coupling in a sliding manner along said upper crosspiece 11.4a;

- rectilinear lower guide means (only the guide means 12.4bl are visible in Fig. 18) comprising, for each of said connector means on the system side, a respective slider, formed by means of a corresponding length of metal pipe with a quadrangular section, engaged in prismatic coupling in a sliding manner along said lower crosspiece 11.4b;

- stable retaining means associated with said rectilinear upper slider guide means 12.4al, 12.4a2, 12.4a3, 12.4a4, 12.4a5 and configured as respective fixed telescoping arms 12.4al0, 12.4a20, 12.4a30, 12.4a40, 12.4a50, extensible and re- tractable relative to the related slider means according to respective directions essen- tially orthogonal to said wall P3, wherein the telescoping lengths of each arm are mu- tually coupled in a non-rotating manner and wherein each of said telescoping arms supports at the respective free end, distal relative to the corresponding slider, a re- spective clamp member FA for the removable connection of a corresponding duct means with essentially vertical axis; - stable retaining means associated with said rectilinear lower slider guide means (only the guide means 12.4bl, are visible in Fig. 18) and configured as respec- tive fixed telescoping arms (only the telescoping arm 12.4bl0 is visible in Fig. 18), ex- tensible and retractable relative to the related slider means according to respective di- rections essentially orthogonal to said wall P3, wherein the telescoping lengths of each arm are mutually coupled in a non-rotating manner and wherein each of said telescop- ing arms supports at the respective free end, distal relative to the corresponding slider, a respective clamp member FA for the removable connection of a corresponding duct means with an essentially vertical axis;

- connection hydraulic duct means 4CA2, 4CA3, 4CA4, 4CA5, having respective essentially vertical axes and respective threaded free ends, extending respectively be- yond said upper crosspiece 11.4a and said lower crosspiece 11.4b, wherein said duct means are respectively fixed relative to said upper 12.4al0, 12.4a20, 12.4a40, 12.4a50 and lower 12.4bl0 stable retaining means by means of said respective clamp fixing members FA;

- connection pneumatic duct means 4CG1 having essentially vertical axes and an upper threaded free end, extending beyond said upper crosspiece 11.4a, and which are fixed relative to said stable retaining means with telescoping arm 12.4a30 by means of clamping inside the respective clamp fixing member FA.

As is evident from the foregoing, the connection device 10.4 described above allows all the functions explained with reference to the connection device 10.1 of the first embodiment of the invention to be implemented.

Moreover, said connection device 10.4 allows correct and stable relative arrangement of the threaded free ends of the connection hydraulic duct means 4CA2, 4CA3, 4CA4, 4CA5 relative to the corresponding connector means on the boiler side and on the sys- tem side, and of the threaded free ends of the connection pneumatic duct means 4CG1 relative to the pneumatic connector means on the boiler side and on the system side to be implemented, by means of adjustment, during assembly, of the position of each of the respective vertical axes simultaneously according to two vertical planes essentially orthogonal to each other. This adjustment is implemented by means of moving, along said upper 11.4a and lower 11.4b crosspieces, said upper 12.4al, 12.4a2, 12.4a3, 12.4a4, 12.4a5 and lower (12.4bl) slider guide means with the cor- responding upper 12.4a l0, 12.4a20, 12.4a40, 12.4a50 and lower (12.4bl0) telescop- ing arms, and by means of extension / retraction of each of said telescoping arms, un- til the two threaded free ends of each connection duct 4CA2, 4CA3, 4CA4, 4CA5 and 4CG1 are arranged axially corresponding to the corresponding connector means (hy- draulic and pneumatic) on the boiler side and on the system side.

After the correct relative arrangement of the parts has been implemented as indicated above, both said slider guide means and said telescoping arm fixing means are fixed in position, for example by means of respective pressure screws.

Variant of embodiment relative to the above third example of embodiment (Figs. 19. 201

In this variant of embodiment, the above described telescoping arm fixing means 12.4al0, 12.4a20, 12.4a30, 12.4a40, 12.4a50 associated with said rectilinear slider guide means (for example upper 12.4al, 12.4a2, 12.4a3, 12.4a4, 12.4a5) are re- placed.

With reference to Figs. 19 and 20, articulated arm fixing means 12.4a60 are associ- ated with the upper crosspiece 11.4a of the support 11.4 and each comprise three rigid segments 12.4a61, articulated to one another and relative to slider guide means 12.4al, on one side, and relative to a clamp fixing member FA, on the other side, by means of respective hinges with essentially vertical axes 12.4a610.

As can be easily understood, by means of the aforesaid arrangement, each of said ar- ticulated arm fixing means 12.4a60 can oscillate in the horizontal plane of the upper crosspiece 11.4a of the support 11.4, in a position in front of this crosspiece, substan- tially in a range of 180° and take an variable extension projecting relative to said crosspiece 11.4a. Consequently, the corresponding clamp fixing member FA can take a plurality of different positions in the aforesaid plane and in a position in front of the crosspiece 11.4a.

Likewise, there are associated with the lower crosspiece of the support 11.4 respective articulated arm fixing means (not illustrated), each comprising three rigid segments, articulated to one another and relative to slider guide means, on the one side, and relative to a clamp fixing member FA, on the other side, by means of respective hinges with essentially vertical axes.

This fact allows correct and stable relative arrangement of the threaded free ends of the connection hydraulic duct means relative to the corresponding connector means on the boiler side and on the system side, and of the threaded free ends of the con- nection pneumatic duct means relative to the pneumatic connector means on the boiler side and on the system side, by means of adjustment, during assembly, of the position of each of the respective vertical axes in said horizontal plane and in a posi- tion in front of the upper and lower crosspieces of the said support. Also the present embodiment of the invention comprises a removable cover (not illus trated) provided to cover, at least frontally, said hydraulic / pneumatic duct means housed in said frame support. Said cover is configured as a sheet metal front hood that engages by snap fitting onto said support fixed to the wall.

Fourth example of embodiment of the connection device of the invention (Figs. 22. 231 The device according to this embodiment is indicated with 10.1' and is similar to that of the first embodiment illustrated above (Figs. 1, 4, 8, 9, 10 and 21). Similar parts are indicated, in Figs. 22, 23, with the same reference numerals used in Figs. 1, 4, 8, 9, 10 and 21, and are not further described.

Said device 10.1' comprises two opposed quadrangular frames Zl, Z2, which have re- spective horizontal crosspieces Zll, Z12 and Z21, respectively upper and lower (the lower crosspiece of the frame Z2 is not visible in the drawing) and are juxtaposed to each other and mutually connected by means of mechanical coupling means with slight press fit: two opposite lateral ribs Z23 projecting from the side elements of the frame Z2 and corresponding recesses provided in two opposite lateral wings Z13 pro- jecting from the side elements of the frame Zl.

Said crosspieces Zll, Z12 and Z21 have respective semi-circular recesses (only the semi-circular recesses Z14 of the frame Zl are visible in the drawing), which form cor- responding circular holes, axially aligned two by two when the crosspieces Zll, Z12 and Z21 of said two frames Zl, Z2 are mutually juxtaposed.

Said two mutually connected frames Zl, Z2 provide support means including four support elements, i.e., the respective crosspieces juxtaposed two by two Zll, Z12 and Z21, relative to which there are supported :

- connection hydraulic duct means CA2, CA3, CA4, CA5, having respective essentially vertical axes and respective threaded free ends, respectively extending beyond said upper crosspieces Zl l, Z21 and said lower crosspieces Z12, through said correspond- ing pairs of axially aligned holes, wherein said threaded free ends are provided with corresponding threaded connector means (not illustrated) for connection relative to said connector means on the boiler side and said connector means on the system side;

- pneumatic duct means CGI having an essentially vertical axis and at least one threaded free end extending beyond said upper crosspieces Zl l, Z21, through a cor- responding hole, while another lower free end is contained inside said support with two juxtaposed frames Zl, Z2, wherein said upper threaded free end is provided with corresponding threaded connector means (not illustrated) for connection relative to said connector means on the boiler side;

- stable retaining means of each of said connection hydraulic duct means CA2, CA3, CA4, CA5, comprising, at each threaded free end of said duct means, a pair of inter- nally threaded mounting nuts, respectively upper and lower, juxtaposed and clamped against the two opposite faces (inner and outer) of said upper crosspieces Zl l, Z21 and said lower crosspieces Z12, respectively;

- stable retaining means of said connection pneumatic duct means CGI, comprising at said upper threaded free end of said duct means a pair of internally threaded mount- ing nuts, juxtaposed and clamped against the two opposite faces (inner and outer) of said upper crosspieces Zl l, Z21.

Moreover, said device 10.1' comprises two covers 13.1', one front and one back, re- movably connected respectively with the frame Z1 and the frame Z2, which protect the arrangement of said connection hydraulic duct means CA2, CA3, CA4, CA5, of said connection pneumatic duct CGI, and of the auxiliary hydraulic means DF, DP and F9 connected with respective hydraulic duct means and included between said upper Zl l, Z21 and lower Z12 horizontal crosspieces of said two frames Zl, Z2.

Said two frames Zl, Z2 and related two covers 13.1' are made of molded plastic ma- terial and provide two half-shells, forming said device 10.1', which can be pre- assembled, before installation on site.

As can be seen from the foregoing, with the present invention it is possible to achieve the objects indicated in the introductory part of this specification in a simple and effec- tive manner.

Claims

1. Method for connecting a wall-mounted boiler (Cl, C2, C3, C3') relative to a hydrau- lic hot water and/or heating system (II, 12, 13), and optionally relative to a town gas system, wherein in the lower part of said wall-mounted boiler there are provided con- nector means (RC1, RC2, RC3, RC4, RC5; 3RC2, 3RC3, 3RC4 and 3RC5) for connec- tion to corresponding hydraulic ducts, and optionally to a corresponding pneumatic gas duct, fixed to the wall, below said connector means of said wall-mounted boiler and forming part of a hydraulic system (II, 12, 13), and optionally of a town gas sup- ply system, of a building or the like, comprising the steps of:

- providing a plurality of hydraulic duct means (CA2, CA3, CA4, CA5; 3CA2, 3CA3, 3CA4, 3CA5; 4CA2, 4CA3, 4CA4, 4CA5), and optionally of pneumatic duct means (CGI ; 3CG1 ; 4CG1);

- providing at least one auxiliary hydraulic means (DF, DP, P9) for a wall-mounted boiler, belonging to the class of filter (DF) and/or doser (DP) and/or pump (P9) auxil- iary hydraulic means for a wall-mounted boiler, and connecting said at least one auxil- iary hydraulic means with a respective of said plurality of hydraulic duct means;

characterized in that it comprises the steps of:

- providing support means (11.1, 11.3, 11.4, Zl, Z2), including at least two support elements (11.1a, 11.1b; 11.3b, 11.3a; 11.4a, 11.4b; Zl l, Z12, Z21) configured to at least partially support between them said plurality of hydraulic duct means (CA2, CA3, CA4, CA5; 3CA2, 3CA3, 3CA4, 3CA5; 4CA2, 4CA3, 4CA4, 4CA5), and optionally said pneumatic duct means (CGI ; 3CG1; 4CG1), in a position below and in an arrange- ment respectively corresponding axially to at least some of said connector means pro- vided in the lower part of said boiler, and to contain, between said at least two sup- port elements, said at least one auxiliary hydraulic means (DF, DP, P9), connected with a respective hydraulic duct means (4CA5, 4CA2, 4CA3) of said plurality of hy- draulic duct means;

- providing stable retaining means (DA11, DA21, DA22; DA31, DA32, DA41, DA42; DA51, DA52; 3DA21'", 3DA22'"; 3DA41'", 3DA42'"; 3DA51'", 3DA52'", 3DA31'", 3DA32'"; 12.4a l0, 12.4a20, 12.4a30, 12.4a40, 12.4a50, 12.4bl0, FA; 12.4a60, FA,

12.4a610) and stably retaining by means of said stable retaining means, relative to said at least two support elements (11.1, 11.3, 11.4; 11.4a, 11.4b; Zll, Z12, Z21), said plurality of hydraulic duct means (CA2, CA3, CA4, CA5; 3CA2, 3CA3, 3CA4, 3CA5; 4CA2, 4CA3, 4CA4, 4CA5), and optionally said pneumatic duct means (CGI; 3CG1; 4CG1), wherein each duct means of said plurality of hydraulic duct means, and optionally said pneumatic duct means, are axially aligned with a respective of said connector means provided in the lower part of said boiler;

- providing stable covering means (13.1; 13.2; 13.3; 13.1'), at least at the front part of said boiler, of said plurality of hydraulic duct means (CA2, CA3, CA4, CA5; 3CA2, 3CA3, 3CA4, 3CA5; 4CA2, 4CA3, 4CA4, 4CA5), and optionally of said pneumatic duct means (CGI; 3CG1; 4CG1), and of said at least one auxiliary hydraulic means (DF, DP, P9);

2. Method according to claim 1, characterized in that it comprises the following steps:

- configuring said support means (11.1, 11.3, 11.4, Zl, Z2) as at least one frame hav- ing at least two horizontal crosspieces (11.1a, 11.1b; 11.3b, 11.3a; 11.4a, 11.4b; Zll, Z12, Z21), wherein said two horizontal crosspieces form said at least two support elements;

- at least partially arranging and stably retaining said plurality of hydraulic duct means (CA2, CA3, CA4, CA5; 3CA2, 3CA3, 3CA4, 3CA5; 4CA2, 4CA3, 4CA4, 4CA5), optionally said pneumatic duct means (CGI; 3CG1; 4CG1), relative to said at least two cross- pieces (11.1a, 11.1b; 11.3b, 11.3a; 11.4a, 11.4b; Zll, Z12, Z21) of said at least one frame (11.1, 11.3, 11.4; Zl, Z2), and arranging between said two crosspieces said at least one of said plurality of auxiliary hydraulic means (DF, DP, P9), connected with a respective of said hydraulic duct means (4CA5, 4CA2, 4CA3), producing a device (10.1, 10.2, 10.3, 10.4, 10.1') pre-assembled for the hydraulic, and optionally pneu- matic, connection of said hydraulic duct means, optionally pneumatic duct means, relative to said connector means of said wall-mounted boiler and relative to a corre- sponding hydraulic hot water and/or heating system, and optionally relative to a cor- responding town gas system; - fixing said device (10.1, 10.2, 10.3, 10.4) pre-assembled under said boiler (Cl, C2, C3, C3') and producing the hydraulic, and optionally pneumatic, connection of said hydraulic duct means, optionally pneumatic duct means, relative to said connector means of said wall-mounted boiler, on the one side, and, on the other side, relative to a corresponding hydraulic hot water and/or heating system, and optionally relative to a corresponding town gas system.

3. Method according to claim 1 and/or 2, characterized in that it comprises the follow- ing steps:

- providing said support means (11.1, 11.3, 11.4; Zl, Z2) with adjustment means (12.1a, 12.1b; 11.3al, 11.3al l, 11.3all l, 11.3al21; 11.3bl, 11.3bll, 11.3bl2, 11.3bll l, 11.3bl21; 12.4al, 12.4a2, 12.4a3, 12.4a4, 12.4a5, 12.4al0, 12.4a20, 12.4a40, 12.4a50, 12.4bl, 12.4bl0; 12.4a60) of the axial arrangement of each hy- draulic duct means of said plurality of hydraulic duct means (CA2, CA3, CA4, CA5; 3CA2, 3CA3, 3CA4, 3CA5; 4CA2, 4CA3, 4CA4, 4CA5), and optionally of said pneumatic duct means (CGI; 3CG1; 4CG1), relative to a respective of said connector means of said boiler, in at least a plane containing the respective axes;

- at least partially arranging said plurality of hydraulic duct means, (CA2, CA3, CA4, CA5; 3CA2, 3CA3, 3CA4, 3CA5; 4CA2, 4CA3, 4CA4, 4CA5) optionally said pneumatic duct means (CGI; 3CG1; 4CG1), between said support means (11.1, 11.3, 11.4);

- adjusting by means of said adjustment means (12.1a, 12.1b; 11.3al, 11.3al l, 11.3all l, 11.3al21; 11.3bl, 11.3bll, 11.3bl2, 11.3bll l, 11.3bl21; 12.4al, 12.4a2, 12.4a3, 12.4a4, 12.4a5, 12.4al0, 12.4a20, 12.4a40, 12.4a50, 12.4bl, 12.4bl0; 12.4a60) the axial arrangement of each hydraulic duct means of said plural- ity of hydraulic duct means, and optionally of said pneumatic duct means, relative to a respective of said connector means of said wall-mounted boiler, in at least a plane containing the respective axes;

- at least partially stably retaining said plurality of hydraulic duct means, optionally said pneumatic duct means, relative to said at least two support elements, by means of said stable retaining means (DA11, DA21, DA22; DA31, DA32, DA41, DA42; DA51, DA52; 3DA21'", 3DA22'"; 3DA41'", 3DA42'"; 3DA51'", 3DA52'", 3DA31'", 3DA32'"; 12.4al0, 12.4a20, 12.4a30, 12.4a40, 12.4a50, 12.4bl0, FA; 12.4a60, FA, 12.4a610), in the respective axial arrangement adjusted by means of said adjustment means.

4. Device (10.1, 10.2, 10.3, 10.4, . ) for connecting a wall-mounted boiler (Cl, C2, C3, C3') relative to a hydraulic hot water and/or heating system (II, 12, 13), and op- tionally relative to a town gas system, wherein in the lower part of said wall-mounted boiler there are provided connector means (RC1, RC2, RC3, RC4, RC5; 3RC2, 3RC3, 3RC4 and 3RC5) for connection to corresponding hydraulic ducts, and optionally to a corresponding pneumatic gas duct, fixed to the wall, below said connector means of said wall-mounted boiler and forming part of a hydraulic system (II, 12, 13), and op- tionally of a town gas supply system, of a building or the like, comprising a plurality of hydraulic duct means (CA2, CA3, CA4, CA5; 3CA2, 3CA3, 3CA4, 3CA5; 4CA2, 4CA3, 4CA4, 4CA5), and optionally of pneumatic duct means (CGI; 3CG1; 4CG1), and at least one auxiliary hydraulic means for a wall-mounted boiler (DF, DP, P9), belonging to the class of auxiliary hydraulic filter (DF) and/or doser (DP) and/or pump (P9) means for a wall-mounted boiler, wherein said at least one auxiliary hydraulic means is connected with a respective of said plurality of hydraulic duct means, characterized in that it comprises:

- support means (11.1, 11.3, 11.4, Zl, Z2), including at least two support elements (11.1a, 11.1b; 11.3b, 11.3a; 11.4a, 11.4b; Zll, Z12, Z21), configured to at least partially support between them said plurality of hydraulic duct means (CA2, CA3, CA4, CA5; 3CA2, 3CA3, 3CA4, 3CA5; 4CA2, 4CA3, 4CA4, 4CA5), and optionally said pneu- matic duct means (CGI; 3CG1; 4CG1), in a position below and in an arrangement re- spectively corresponding axially to at least some of said connector means provided in the lower part of said boiler, and to contain, between said at least two support ele- ments, said at least one auxiliary hydraulic means (DF, DP, P9), connected with a re- spective hydraulic duct means (4CA5, 4CA2, 4CA3) of said plurality of hydraulic duct means;

- stable retaining means (DA11, DA21, DA22; DA31, DA32, DA41, DA42; DA51, DA52; 3DA21'", 3DA22'"; 3DA41'", 3DA42'"; 3DA51'", 3DA52'", 3DA31'", 3DA32'"; 12.4al0, 12.4a20, 12.4a30, 12.4a40, 12.4a50, 12.4bl0, FA; 12.4a60, FA, 12.4a610), relative to said at least two support elements (11.1, 11.3, 11.4; 11.4a, 11.4b), of said plurality of hydraulic duct means (CA2, CA3, CA4, CA5; 3CA2, 3CA3, 3CA4, 3CA5; 4CA2, 4CA3, 4CA4, 4CA5), and optionally of said pneumatic duct means (CGI; 3CG1; 4CG1), wherein each duct means of said plurality of hydraulic duct means, and op- tionally said pneumatic duct means, are axially aligned with a respective of said con- nector means provided in the lower part of said boiler; - stable covering means (13.1; 13.2; 13.3, 13.1'), provided at least at the front part of said boiler, of said plurality of hydraulic duct means (CA2, CA3, CA4, CA5; 3CA2, 3CA3, 3CA4, 3CA5; 4CA2, 4CA3, 4CA4, 4CA5), and optionally of said pneumatic duct means (CGI; 3CG1; 4CG1), and of said at least one auxiliary hydraulic means (DF, DP, P9).

5. Device according to claim 4, characterized in that said support means (11.1, 11.3, 11.4, Zl, Z2) are configured as at least one frame having at least two horizontal crosspieces (11.1a, 11.1b; 11.3b, 11.3a; 11.4a, 11.4b; Zl l, Z12, Z21), wherein said two horizontal crosspieces provide said at least two support elements of said plurality of hydraulic duct means, and optionally said pneumatic duct means, and in that said plurality of hydraulic duct means, optionally said pneumatic duct means, at least par- tially stably retained relative to said two crosspieces of said at least one frame, and said at least one auxiliary hydraulic means, arranged between said two crosspieces and connected with a respective of said hydraulic duct means, provide a device (10.1, 10.2, 10.3, 10.4, 10.1') pre-assembled for the hydraulic, and optionally pneumatic, connection of said hydraulic duct means, optionally pneumatic duct means, relative to said connector means of said wall-mounted boiler and relative to a corresponding hy- draulic hot water and/or heating system, and optionally relative to a corresponding town gas system.

6. Device according to claim 4 and/or 5, characterized in that said support means are provided with adjustment means (12.1a, 12.1b; 11.3a l, 11.3all, 11.3al ll, 11.3al21; 11.3bl, 11.3bll, 11.3bl2, 11.3bll l, 11.3bl21; 12.4al, 12.4a2, 12.4a3, 12.4a4, 12.4a5, 12.4al0, 12.4a20, 12.4a40, 12.4a50, 12.4bl, 12.4bl0; 12.4a60) of the axial arrangement of each hydraulic duct means of said plurality of hydraulic duct means (CA2, CA3, CA4, CA5; 3CA2, 3CA3, 3CA4, 3CA5; 4CA2, 4CA3, 4CA4, 4CA5), and optionally of said pneumatic duct means (CGI; 3CG1; 4CG1), relative to a respec- tive of said connector means of said wall-mounted boiler, in at least a plane containing the respective axes.

7. Device (10.1, 10.2) for connecting a wall-mounted boiler (Cl, C2) according to one or more of claims 4 to 6, characterized in that comprises:

- support means (11.1), fixed to a wall (PI) on which said boiler (Cl, C2) is mounted, arranged between said connector means (RC1, RC2, RC3, RC4, RC5) on the boiler side and connector means (RI2, RI3, RI4, RI5) on the system side, wherein said support means (11.1,11.2) are configured as a frame having :

an essentially horizontal upper crosspiece (11.1a) close to all the free ends of the connector means above on the boiler side (RC1, RC2, RC3, RC4 and RC5), and

an essentially horizontal lower crosspiece (11.1b) close to all the free ends of the connector means below on the system side (RI2, RI3, RI4, RI5);

- upper rectilinear guide means (12.1a) provided in said upper crosspiece (11.1a), wherein said upper rectilinear guide means (12.1a) are configured as an upper slotted hole corresponding to all the free ends of the connector means above on the boiler side (RC1, RC2, RC3, RC4 and RC5) and whose major axis extends for a substantial part of said crosspiece (11.1a), according to a vertical plane essentially parallel to the plane containing the vertical axes of at least some of said connector means on the boiler side (RC1, RC2, RC3, RC4 and RC5) and of said connector means on the system side (RI2, RI3, RI4, RI5);

- lower rectilinear guide means (12.1b) provided in said lower crosspiece (11.1b), wherein said lower rectilinear guide means (12.1b) are configured as a lower slotted hole corresponding to all the free ends of the connector means below on the system side (RI2, RI3, RI4, RI5) and whose major axis extends for a substantial part of said crosspiece (11.1b), according to a vertical plane essentially parallel to the plane con- taining the vertical axes of at least some of said connector means on the boiler side (RC1, RC2, RC3, RC4, RC5) and of said connector means on the system side (RI2, RI3, RI4, RI5);

- connection hydraulic duct means (CA2, CA3, CA4, CA5), having respective essen- tially vertical axes and respective free ends, respectively extending beyond said upper crosspiece (11.1a) and said lower crosspiece (11.1b), through said corresponding up- per (12.1a) and lower (12.1b) slotted holes, wherein said free ends are provided with corresponding threaded connector means for connection relative to said connector means on the boiler side and said connector means on the system side;

- connection pneumatic duct means (CGI) having an essentially vertical axis and at least one free end, extending beyond said upper crosspiece (11.1a), through said up- per slotted hole (12.1a), wherein said upper free end is provided with corresponding threaded connector means for connection relative to said connector means on the boiler side; - stable retaining means of each of said connection hydraulic duct means (CA2, CA3, CA4, CA5), comprising, at each free end of said duct means, a pair of mounting nuts, respectively upper and lower, (DA21, DA22; DA31, DA32; DA41, DA42; DA51, DA52), juxtaposed and clamped against the two opposite faces of said upper crosspiece (11.1a) and of said lower crosspiece (11.1b), respectively;

- optionally, stable retaining means of said connection pneumatic duct means (CGI), comprising at said upper free end of said duct means a pair of mounting nuts (DA11), juxtaposed and clamped against the two opposite faces of said upper crosspiece (H. la);

- at least front covering means (13.1; 13.2) of said hydraulic duct means, and option- ally of said pneumatic duct means, retained relative to said support means (11.1) in an arrangement corresponding to at least some of said connector means provided in the lower part of said boiler.

8. Device (10.3) for connecting a wall-mounted boiler (C3, C3') according to one or more of claims 4 to 6, characterized in that comprises:

- support means (11.3), fixed to a wall (P3) on which said boiler (C3, C3') is mounted between said hydraulic connector means (3RC2, 3RC3, 3RC4, 3RC5) on the boiler side and connector means (3RI2, 3RI3, 3RI4, 3RI5) on the system side, and between op- tional pneumatic connector means for a town gas duct on the boiler side and on the system side, wherein said support means (11.3) are configured as a frame, having :

an essentially horizontal upper crosspiece (11.3a) close to the free ends of the connector means above on the boiler side (3RC1, 3RC2, 3RC3, 3RC4 and 3RC5), wherein said crosspiece (11.3a) has an opening (11.3al), ex- tending substantially for the whole of its length and corresponding to all said free ends of the connector means above on the boiler side, and two opposite lateral edges (11.3al l, 11.3al2) delimiting said opening (11.3al) and wherein, in each of said two opposite lateral edges (11.3al l, 11.3al2), there are respectively provided slotted holes (11.3alll and 11.3al21) whose major axis is contained in a plane essentially parallel to said wall (P3), each slotted hole (11.3bl21) of a lateral edge (11.3al2) being oppo- site a respective slotted hole (11.3bl ll) of the other lateral edge (11.3al l);

an essentially horizontal lower crosspiece (11.3b) close to the free ends of the connector means below on the system side (3RI2, 3RI3, 3RI4, 3RI5), wherein said crosspiece (11.3b) has an opening (11.3bl), extending sub- stantially for the whole of its length and corresponding to all said free ends of the connector means below on the system side, and two opposite lateral edges (11.3bll, 11.3bl2) delimiting said opening (11.3bl) and wherein, in each of said two opposite lateral edges (11.3bll, 11.3bl2), there are re- spectively provided slotted holes (11.3bl ll, 11.3bl21) whose major axis is contained in the plane essentially parallel to said wall (P3), each slotted hole (11.3bl21) of a lateral edge (11.3bl2) being opposite a respective slotted hole (11.3bll l) of the other lateral edge (11.3bl l);

- upper rectilinear guide means (12.3al, 12.3a2, 12.3a3, 12.3a4, 12.3a5) compris- ing, for at least some of said connector means on the boiler side (3RG1, 3RC2, 3RC3, 3RC4, 3RC5), a respective moving plate juxtaposed relative to said two opposite lat- eral edges (11.3al l, 11.3al2) of said upper crosspiece (11.3a) and bridging said up- per central opening (11.3al), wherein said upper rectilinear plate guide means (12.3al, 12.3a2, 12.3a3, 12.3a4, 12.3a5) comprise a respective upper slotted hole (12.3all, 12.3a21, 12.3a31, 12.3a41, 12.3a51), extending for a substantial part of said upper central opening (11.3al) and whose major axis is contained in an essen- tially vertical plane orthogonal to said wall (P3);

- lower rectilinear guide means (12.3bl, 12.3b2, 12.3b3, 12.3b4, 12.3b5) comprising, for at least some of said connector means on the system side (3RI2, 3RI3, 3RI4, 3RI5), a respective moving plate juxtaposed relative to said two opposite lateral edges (11.3bll, 11.3bl2) of said lower crosspiece (11.3b) and bridging said lower central opening (11.3bl), wherein said lower rectilinear plate guide means (12.3bl, 12.3b2, 12.3b3, 12.3b4, 12.3b5) comprise a respective lower slotted hole (12.3bl l, 12.3b21, 12.3b31, 12.3b41, 12.3b51), whose major axis is contained in an essentially vertical plane orthogonal to said wall (P3) and extending for a substantial part of said lower central opening (11.3bl);

- means for the removable fixing of said upper rectilinear plate guide means (12.3al, 12.3a2, 12.3a3, 12.3a4, 12.3a5) relative to said opposite lateral edges (11.3al l, 11.3al2) of said upper crosspiece (11.3a) at respective opposite pairs of said slotted holes (11.3all l, 11.3al21);

- means for the removable fixing of said lower rectilinear plate guide means (12.3bl, 12.3b2, 12.3b3, 12.3b4, 12.3b5) relative to said opposite lateral edges (11.3bl l, 11.3bl2) of said lower crosspiece (11.3b) at respective opposite pairs of said slotted holes (11.3bll l, 11.3bl21); - connection hydraulic duct means (3CA2, 3CA3, 3CA4, 3CA5), having respective es- sentially vertical axes and respective free ends, extending respectively beyond said upper crosspiece (11.3a) and said lower crosspiece (11.3b), through said upper slot- ted holes (12.3al l, 12.3a21, 12.3a41, 12.3a51) and said lower slotted holes (12.3bll, 12.3b21, 12.3b41, 12.3b51) of corresponding opposite pairs of said upper (12.3al, 12.3a2, 12.3a4, 12.3a5) and lower (12.3bl, 12.3b2, 12.3b4, 12.3b5) plate guide means, respectively;

- optionally, connection pneumatic duct means (3CG1) having an essentially vertical axis and an upper free end, extending beyond said upper crosspiece (11.3a), through said upper slotted hole (12.3a31) of said upper plate guide means (12.3a3), and a lower free end, extending beyond said lower crosspiece (11.3b), through said lower slotted hole (12.3b31) of said lower plate guide means (12.3b3);

- stable retaining means of each of said connection hydraulic duct means (3CA2,

3CA3, 3CA4, 3CA5), comprising at each of the two free ends of the said duct means (3CA2, 3CA3, 3CA4, 3CA5), which extend beyond a respective pair of upper and lower slotted holes (12.3all/12.3bl l, 12.3a21/12.3b21, 12.3a41/12.3b41,

12.3a51/12.3b51), a pair of internally threaded mounting nuts, respectively upper and lower, (3DA21'", 3DA22'"; 3DA41'", 3DA42'"; 3DA51'", 3DA52'"), juxtaposed and clamped against the two opposite faces of respective upper and lower plate guide means (12.3al/12.3bl, 12.3a2/12.3b2, 12.3a4/12.3b4, 12.3a5/12.3b5), respectively;

- optionally, stable retaining means of said connection pneumatic duct means (3CG1), comprising at each of the two free ends of the said duct means (3CG1), which extend beyond a respective pair of upper and lower slotted holes (12.3a31/12.3b31) of a pair of respective upper and lower opposite plate guide means, a pair of internally threaded mounting nuts, respectively upper and lower, (3DA31'", 3DA32'"), juxta- posed and clamped against the two opposite faces of said pair of respective upper and lower plate guide means (12.3a3/12.3b3);

- at least front covering means (13.3) of said hydraulic duct means, and optionally of said pneumatic duct means, retained relative to said support structure (11.3) in an ar- rangement corresponding to at least some of said connector means provided in the lower part of said boiler.

9. Device (10.4) for connecting a wall-mounted boiler according to one or more of claims 4 to 6, characterized in that it comprises: - support means (11.4), fixed to a wall on which said boiler is mounted, arranged be- tween said hydraulic connector means on the boiler side and said hydraulic connector means on the system side, and between optional pneumatic connector means for a town gas duct on the boiler side and on the system side, wherein said support means (11.4) are configured as a frame, having :

an essentially horizontal upper crosspiece (11.4a), close to the free ends of the connector means above on the boiler side;

an essentially horizontal lower crosspiece (11.4b), close to the free ends of the connector means below on the system side;

upper rectilinear guide means (12.4al, 12.4a2, 12.4a3, 12.4a4, 12.4a5) comprising, for at least some of said connector means on the boiler side, a respective slider, engaged in a sliding manner relative to said upper crosspiece (11.4a);

lower rectilinear guide means (12.4bl) comprising, for at least some of said connector means on the system side a respective slider, engaged in a sliding manner relative to said lower crosspiece (11.4b);

stable retaining means associated with said upper slider guide means (12.4al, 12.4a2, 12.4a3, 12.4a4, 12.4a5) and configured as respective fixed arms (12.4al0, 12.4a20, 12.4a30, 12.4a40, 12.4a50), wherein each of said arms supports at a respective free end, distal relative to the corre- sponding slider guide means, a respective connection member (FA) of a corresponding duct means with an essentially vertical axis;

stable retaining means associated with said lower slider guide means (12.4bl) and configured as respective fixed arms (12.4bl0), wherein each of said arms supports at a respective free end, distal relative to the corre- sponding slider guide means, a respective connection member (FA) of a corresponding duct means with an essentially vertical axis;

connection hydraulic duct means (4CA2, 4CA3, 4CA4, 4CA5), having re- spective essentially vertical axes and respective free ends, extending re- spectively beyond said upper crosspiece (11.4a) and said lower crosspiece (11.4b), wherein said duct means are respectively fixed relative to said upper (12.4al0, 12.4a20, 12.4a40, 12.4a50) and lower (12.4bl0) stable retaining means by means of said respective connection members (FA); optionally, connection pneumatic duct means (4CG1) having an essentially vertical axis and an upper free end, extending beyond said upper cross- piece (11.4a), wherein said pneumatic duct means are fixed relative to corresponding stable retaining means (12.4a30) by means of at least one respective connection member (FA).

10. Device (10.4) for connecting a wall-mounted boiler according to claim 9, charac- terized in that:

said stable retaining means associated with said upper slider guide means (12.4al, 12.4a2, 12.4a3, 12.4a4, 12.4a5) are configured as respective fixed telescoping arms (12.4al0, 12.4a20, 12.4a30, 12.4a40, 12.4a50), extensible and retractable according to respective directions essentially or- thogonal to said wall, wherein each of said telescoping arms supports at the respective free end, distal relative to the corresponding slider guide means, a respective connection member (FA) of a corresponding duct means with an essentially vertical axis, and

said stable retaining means associated with said lower slider guide means (12.4bl) are configured as respective fixed telescoping arms (12.4bl0), extensible and retractable according to respective directions essentially or- thogonal to said wall, wherein each of said telescoping arms supports at the respective free end, distal relative to the corresponding slider guide means, a respective connection member (FA) of a corresponding duct means with an essentially vertical axis.

11. Device (10.4) for connecting a wall-mounted boiler according to claim 9, charac- terized in that:

said stable retaining means associated with said upper slider guide means (12.4al, 12.4a2, 12.4a3, 12.4a4, 12.4a5) are configured as respective ar- ticulated arms (12.4a60), each comprising a plurality of segments (12.4a61), articulated to one another and relative to slider guide means (12.4al), on one side, and relative to a connection member (FA), on the other side, and

said stable retaining means associated with said lower slider guide means (12.4bl) are configured as respective articulated arms, each comprising a plurality of segments, articulated to one another and relative to slider guide means (12.4bl), on one side, and relative to a connection member (FA), on the other side.

12. Device (10.1') for connecting a wall-mounted boiler according to one or more of claims 4 to 6, characterized in that it comprises:

- two opposed frames (Zl, Z2), having respective horizontal crosspieces (Zl l, Z12, Z21), respectively upper and lower, and which are juxtaposed to each other and mu- tually connected, wherein said crosspieces (Zll, Z12, Z21) have respective semi- circular recesses, which form corresponding circular holes axially aligned two by two when the crosspieces (Zll, Z12, Z21) of the said two frames (Zl, Z2) are mutually juxtaposed;

in that said two mutually connected frames (Zl, Z2) provide support means, including four support elements, i.e., said pairs of upper and lower crosspieces (Zl l, Z12, Z21), relative to which there are supported :

- connection hydraulic duct means (CA2, CA3, CA4, CA5), having respective essen- tially vertical axes and respective threaded free ends, respectively extending beyond said upper crosspieces (Zll, Z21) and said lower crosspieces (Z12), through said cor- responding pairs of axially aligned holes, wherein said threaded free ends are provided with corresponding threaded connector means for connection relative to said connec- tor means on the boiler side and said connector means on the system side;

- pneumatic duct means (CGI) having an essentially vertical axis and at least one threaded free end, extending beyond said upper crosspieces (Zl l, Z21), through a corresponding hole, while another lower free end is contained inside said support with two juxtaposed frames (Zl, Z2), wherein said upper threaded free end is provided with corresponding threaded connector means for connection relative to said connec- tor means on the boiler side;

- stable retaining means of each of said connection hydraulic duct means (CA2, CA3, CA4, CA5), comprising, at each threaded free end of said duct means, a pair of inter- nally threaded mounting nuts, respectively upper and lower, juxtaposed and clamped against the two opposite faces (inner and outer) of said upper crosspieces (Zll, Z21) and of said lower crosspieces (Z12), respectively;

- stable retaining means of said connection pneumatic duct means (CGI), comprising at said upper threaded free end of said duct means a pair of internally threaded mounting nuts, juxtaposed and clamped against the two opposite faces (inner and outer) of said upper crosspieces (Zll, Z21); in that between said upper crosspieces (Zl l, Z21) and said lower crosspieces (Z12) of said two opposed frames (Zl, Z2) there is included at least one auxiliary hydraulic means (DF, DP, F9), connected with a respective hydraulic duct means,

and in that said device (10.1') comprises two covers (13.1'), one front and the other back, respectively connected with said two opposed frames (Zl, Z2) and which protect the arrangement of said connection hydraulic duct means (CA2, CA3, CA4, CA5), of said connection pneumatic duct (CGI), and of said at least one auxiliary hydraulic means (DF, DP, F9), connected with a respective hydraulic duct means and included between said upper (Zll, Z21) and lower (Z12) horizontal crosspieces of said two op- posed frames (Zl, Z2).

13. Device (10.1, 10.4) for connecting a wall-mounted boiler according to one or more of claims 4 to 12, characterized in that said duct means (CA4, CA3; CA2, CA5, CGI), which produce the sealed connection between connector means on the boiler side (RC4, RC3, RC2, RC5, RC1) relative to corresponding connector means on the system side (RI4, RI3, RI2, RI5), are provided with respective shut-off valve means (V8, VI; V2, V7; V5, V3; V4; V6), each configured as a gate valve and arranged at least in proximity of said connector means on the boiler side (RC4, RC3, RC2, RC5, RC1) and optionally of said connector means on the system side (RI4, RI3, RI2).

14. Device (10.1, 10.4) for connecting a wall-mounted boiler according to claim 13, characterized in that said shut-off valve means (V8, VI; V2, V7; V5, V3; V4; V6) re- spectively have a threaded connection, protected by a corresponding threaded cap (V8.1).

15. Device (10.1, 10.4) for connecting a wall-mounted boiler according to claim 13 and/or 14, characterized in that said shut-off valve means (V8, VI; V2, V7; V5, V3; V4; V6) are configured as three-way valve comprising a ball, inner channel to direct the flow and screw closing cap on the fluid inlet/outlet.