EP0466576B1 - Mixed central heating boiler - Google Patents

Abstract

The invention relates to a terminal strip (R) for a mixed hot water central heating boiler. This strip comprises four modules (A, B, C, D) made of hard moulded plastic material, which are assembled side by side by mutual juxtaposition and passage of tie rods, which modules are assigned respectively to the outlet of the heating water, to the outlet of the hot service water, to the inlet of cold water and to the return of the heating water and each comprising the relevant pipes and taps as well as sections of duct (26, 31, 38, 46) making it possible to form together a short circuit on the heating circuit, which can be used for supplying this circuit with water and for impermeability tests in the absence of the boiler. <IMAGE>

Description

The invention relates to mixed central heating boilers, that is to say to devices intended for heating water in two circuits, one intended for central heating by circulation of hot water in radiators or the like. and the other to hot water draws called "sanitary" for the toilet, the kitchen ..., the calories necessary for the heating of this water being preferably generated by combustion of a combustible gas.

It relates more particularly to the connection portions of these boilers to the external pipes for cold or lukewarm water inlet and hot water outlet.

With the known embodiments of these devices (see document FR-A-2 398 271) it is necessary to interpose a whole series of accessories between the boiler coming from the factory and the external pipes in order to allow in particular the 'supply of pressurized water circuits generally coming from an external city network, the respective insulations of these circuits and safety against overpressures or leaks.

In addition, it is generally not possible, with these embodiments, to carry out pressure tightness tests on the central heating circuit comprising the radiators until the boiler is put in place: c is a drawback when the installation to be fitted is still under construction and therefore not yet protected against theft or damage.

The invention overcomes these drawbacks and proposes to this end to constitute the connecting portions of boilers of the kind in question by special "bars", the construction of which is particularly simple and economical, bars making it possible to test the central heating circuit under pressure in the absence of the boiler proper, that is to say of the active portion, of this boiler, including the burner and the heater.

To this end, the connection portions of the type in question according to the invention are essentially characterized in that they comprise four modular elements or "modules" molded assembled side by side by mutual juxtaposition and common crossing of tie rods preferably comprising ends threaded cooperating with clamping nuts, in that the first module comprises an inlet which can be connected to the boiler start-heating piping, an outlet which can be connected to the heating-starting pipe to the radiators, a conduit connecting this inlet to this outlet, a manual isolation valve mounted on this conduit, a safety valve connecting said conduit to an evacuation pipe, and a short-circuit section suitable for connecting the above conduit with the second module, in that this second module includes an input that can be connected to the boiler domestic hot water flow pipe, an output that can be connected the domestic hot water flow pipe to at least one draw-off tap, a conduit connecting this inlet to this outlet, a short-circuit section crossing said second module from the first to the third module, and a pressure gauge connected to this last section, in that the third module includes an outlet which can be connected to the domestic cold water inlet piping in the boiler, an inlet which can be connected to a pressurized cold water supply pipe from the outside, a conduit connecting this inlet at this outlet, an isolation valve mounted on this conduit, a short-circuit section crossing said third module from second to fourth module and a barrier member interposed between this last section and the recently mentioned pipe and in that the fourth module comprises an outlet connectable to the return-heating piping to the boiler, an inlet connectable to the return-heating from radiators, a conduit connecting this input to this output, an isolation valve mounted on this conduit and a short-circuit section suitable for connecting said conduit to the short-circuit section of the third module, the various modules being arranged in such a way that their simple juxtaposition connects end to end in a sealed manner the different short-circuit sections comprised by the four modules.

• le troisième module est associé à un organe de sécurité qui est lui même relié à la conduite d'évacuation du premier module par des tronçons d'évacuation compris respectivement par les trois premiers modules et connectés bout à bout de façon étanche et automatique par la simple juxtaposition mutuelle de ces trois modules,
• l'organe de barrage équipant le troisième module est une vanne à deux clapets montés en série entre le conduit d'admission d'eau froide sanitaire et le tronçon de court-circuit de ce troisième module, et cette vanne est associée à un organe de sécurité "disconnecteur" et à un compartiment central mis à l'air libre susceptible de recueillir les fuites d'eau produites entre les deux clapets,
• le quatrième module comprend un clapet de décharge monté sur le tronçon de court-circuit de ce quatrième module, ce clapet étant sollicité vers sa position de fermeture par un ressort taré de façon telle qu'il s'ouvre uniquement s'il existe dans le circuit de chauffage une perte de charge dépassant un seuil donné, en raison par exemple de la fermeture de robinets thermostatiques,
• le robinet d'isolement équipant le quatrième module est équipé d'un filtre facilement amovible lorsque ce robinet est fermé, filtre permettant de retenir les impuretés provenant du circuit de chauffage et d'empêcher leur envoi dans le corps de chauffe de la chaudière,
• au moins un autre module moulé est assemblé contre l'ensemble des quatre modules ci-dessus définis à l'aide des tirants qui assemblent entre eux ces quatre modules, savoir un cinquième module comprenant une entrée raccordable à une tuyauterie d'alimentation extérieure en gaz sous pression, une sortie raccordable à la tuyauterie d'alimentation en gaz du brûleur de la chaudière, un conduit reliant cette entrée à cette sortie et un robinet d'isolement monté sur ce conduit, ainsi qu'éventuellement un sixième module affecté aux différents raccordements électriques de la chaudière,
• les modules moulés sont constitués en des matières plastiques dures qui peuvent être différentes pour les différents modules,
• chaque module moulé comprend une ceinture périphérique prismatique ou cylindrique dont le contour est sensiblement rectangulaire avec des coins arrondis, quatre canaux rectilignes disposés respectivement aux quatre coins de cette ceinture et destinés à recevoir les tirants et une pluralité de tronçons tubulaires rectilignes ou coudés entretoisés par des voiles généralement plans s'étendant perpendiculairement aux génératrices du prisme ou cylindre définissant la ceinture,
• les entrées ou sorties de raccordement à la chaudière sont toutes disposées sur la face supérieure de la barrette et la plupart des entrées ou sorties de raccordement aux tuyauteries extérieures sont disposées sur la face arrière de cette barrette.

In preferred embodiments, use is also made of one and / or the other of the following arrangements:

• the third module is associated with a safety device which is itself connected to the discharge pipe of the first module by discharge sections comprised respectively by the first three modules and connected end to end in a sealed and automatic manner by the simple mutual juxtaposition of these three modules,
• the barrier member equipping the third module is a valve with two valves mounted in series between the domestic cold water inlet duct and the short-circuit section of this third module, and this valve is associated with a safety "backflow preventer" and a central compartment in the open air capable of collecting water leaks produced between the two valves,
• the fourth module comprises a relief valve mounted on the short-circuit section of this fourth module, this valve being urged towards its closed position by a spring calibrated so that it only opens if there is a pressure drop in the heating circuit exceeding a given threshold, for example due to the closing of thermostatic valves,
• the isolation valve fitted to the fourth module is equipped with an easily removable filter when this valve is closed, a filter allowing to retain the impurities coming from the heating circuit and to prevent their sending into the heating body of the boiler,
• at least one other molded module is assembled against all of the above four modules defined using tie rods which assemble these four modules together, namely a fifth module comprising an inlet connectable to an external gas supply pipe under pressure, an outlet connectable to the gas supply pipe to the boiler burner, a conduit connecting this inlet to this outlet and an isolation valve mounted on this duct, as well as possibly a sixth module assigned to the various connections electric boiler,
• the molded modules are made of hard plastics which may be different for the different modules,
• each molded module comprises a prismatic or cylindrical peripheral belt whose contour is substantially rectangular with rounded corners, four rectilinear channels disposed respectively at the four corners of this belt and intended to receive the tie rods and a plurality of rectilinear or bent tubular sections braced by generally flat sails extending perpendicular to the generatrix of the prism or cylinder defining the belt,
• the inputs or outputs connecting to the boiler are all arranged on the upper face of the strip and most of the inputs or outputs of connection to the external pipes are arranged on the rear face of this bar.

The invention includes, apart from these main provisions, certain other provisions which are preferably used at the same time and which will be more explicitly discussed below.

In what follows, a preferred embodiment of the invention will be described with reference to the accompanying drawings in a manner which is of course not limiting.

FIG. 1, of these drawings, very schematically shows a mixed central heating boiler, the connection portion of which is connected to the external piping consists of a bar established in accordance with the invention.

Figure 2 shows the same bar schematically, but in more detail.

Figure 3 shows in side view an embodiment of said bar.

Figure 4 shows in perspective view one of the constituent modules of this bar.

In a manner known per se, the combined boiler considered comprises, inside a casing 1, a burner 2 supplied with pressurized combustible gas from a network 3 via a gas pipe 4 associated with safety means (not shown) and with a tap 5.

The closed heating circuit comprises, inside the casing 1, an exchanger 6 in which the circulating water collects the calories generated by the flames 7 of the burner 2 and, outside said casing, a pipe 8 passing successively the heating radiators 9 and a circulation pump 10.

Finally, the drawing-off circuit successively comprises, from an external source of pressurized water 11 generally constituted by a city network, an external intake pipe 12, an exchanger 13 inside the casing 1 also making it possible to collect the calories produced by the flames 7 and an outlet pipe 14 ending in at least one tap 15.

The invention essentially relates to the connection portion R which is interposed between the external pipes 8, 12 and 14 and the internal pipes comprising the exchangers 6 and 13.

This connection portion R is here constituted by a set of molded hard plastic modules which are juxtaposed against each other and joined together by tie rods 16 advantageously constituted by rods whose threaded ends cooperate with tightening nuts 17.

• le premier module A, au départ de l'eau de chauffage,
• le second module B, au départ de l'eau chaude sanitaire,
• le troisième module C, à l'arrivée de l'eau froide sanitaire,
• et le quatrième module D, au retour de l'eau de chauffage.

These modules are at least four in number, assigned respectively:

• the first module A, from the heating water,
• the second module B, from domestic hot water,
• the third module C, on the arrival of cold domestic water,
• and the fourth module D, on return of the heating water.

• au premier module A, une entrée 18 raccordable à la tuyauterie de départ-chauffage 19 de la chaudière, une sortie 20 raccordable à la tuyauterie de départ-chauffage 21 vers les radiateurs, un conduit 22 reliant cette entrée à cette sortie, un robinet 23 manuel d'isolement monté sur ce conduit, une soupape de sécurité 24 reliant ledit conduit 22 à une conduite d'évacuation 25 et un tronçon de court-circuit 26 propre à relier le conduit 22 ci-dessus avec le second module B,
• à ce second module B, une entrée 27 raccordable à la tuyauterie 28 de départ-eau chaude sanitaire de la chaudière, une sortie 29 raccordable à la tuyauterie 14 de départ-eau chaude sanitaire vers au moins un robinet de puisage 15, un conduit 30 reliant cette entrée à cette sortie, un tronçon de court-circuit 31 traversant ledit second module B du premier A au troisième module C, et un manomètre 32 branché sur ce dernier tronçon 31,
• au troisième module C, une sortie 33 raccordable à la tuyauterie 34 d'arrivée d'eau froide sanitaire dans la chaudière, une entrée 35 raccordable à la tuyauterie 12 d'alimentation en eau froide sous pression venant de l'extérieur, un conduit 36 reliant cette entrée à cette sortie, un robinet d'isolement 37 monté sur ce conduit, un tronçon de court-circuit 38 traversant ledit troisième module C du second B au quatrième module D et un organe de barrage 39 interposé entre ce dernier tronçon 38 et le conduit 36 dernièrement cité,
• et au quatrième module D, une sortie 40 raccordable à la tuyauterie 41 de retour-chauffage vers la chaudière, une entrée 42 raccordable à la tuyauterie de retour-chauffage 43 provenant des radiateurs, un conduit 44 reliant cette entrée à cette sortie, un robinet d'isolement 45 monté sur ce conduit et un tronçon de court-circuit 46 propre à relier ledit conduit 44 au tronçon de court-circuit 38 du troisième module.

We understand:

• to the first module A, an inlet 18 connectable to the heating start-up piping 19 of the boiler, an outlet 20 connectable to the heating-start-up piping 21 to the radiators, a conduit 22 connecting this inlet to this outlet, a tap 23 manual isolation mounted on this pipe, a safety valve 24 connecting said pipe 22 to a discharge pipe 25 and a short-circuit section 26 suitable for connecting pipe 22 above with the second module B,
• to this second module B, an inlet 27 connectable to the piping 28 of domestic hot water start-up of the boiler, an outlet 29 connectable to the pipework 14 of domestic hot water start-up to at least one tap 15, a conduit 30 connecting this input to this output, a short-circuit section 31 crossing said second module B from the first A to the third module C, and a pressure gauge 32 connected to this last section 31,
• in the third module C, an outlet 33 which can be connected to the piping 34 for supplying sanitary cold water to the boiler, an inlet 35 which can be connected to the piping 12 for supplying pressurized cold water from outside, a conduit 36 connecting this input to this output, an isolation valve 37 mounted on this conduit, a short-circuit section 38 crossing said third module C from the second B to the fourth module D and a barrier member 39 interposed between this last section 38 and the recently cited conduit 36,
• and in the fourth module D, an outlet 40 connectable to the return-heating piping to the boiler, an inlet 42 connectable to the return-heating pipe 43 coming from the radiators, a conduit 44 connecting this inlet to this outlet, a tap insulation 45 mounted on this conduit and a short-circuit section 46 suitable for connecting said conduit 44 to the short-circuit section 38 of the third module.

The different modules are arranged in such a way that their simple juxtaposition connects the different short-circuit sections 26, 31, 38 and 46 comprised by the four modules end-to-end in a sealed manner.

To this end, the end pieces of sections to be mutually connected are arranged so as to fit one into the other with the interposition of an O-ring 47 housed in an appropriate groove hollowed out in the external cylindrical face of the male end piece. of each pair end caps.

• de brancher automatiquement une canalisation de court-circuit 26,31,38,46 entre les deux embouchures 18 et 40 correspondant respectivement aux raccords des deux extrémités 19 et 41 de la portion, du circuit fermé de chauffage, intérieure à la chaudière,
• et de relier automatiquement au circuit de chauffage la conduite extérieure d'admission d'eau froide 12 moyennant la simple ouverture du robinet de barrage 39 après celle du robinet 37.

In this way, the simple mutual assembly of the four modules A, B, C, D allows:

• automatically connect a short-circuit pipe 26,31,38,46 between the two mouths 18 and 40 corresponding respectively to the connections of the two ends 19 and 41 of the portion, of the closed heating circuit, inside the boiler,
• and to automatically connect the external cold water inlet pipe 12 to the heating circuit by simply opening the barrier valve 39 after that of the valve 37.

It should be noted that it is possible not to set up the boiler at this stage while making it possible from this point to test the pressure under pressure on the portion, of the central heating circuit, external to the boiler.

It suffices then to place three plugs (not shown) respectively on the three mouths 18.33 and 40 of the connection strip R, as shown diagrammatically by crosses in FIG. 1, then to open the various taps 23.37 , 39 and 45.

This possibility of carrying out the leaktightness tests under pressure on the entire closed central heating circuit, excluding its portion inside the boiler, even in the absence of said boiler, constitutes an important advantage of the present invention.

The preferred embodiment illustrated also implements a certain number of other provisions and in particular those described below:

The third module C is associated with a safety member 48 (FIG. 2) arranged so as to, on the one hand, make it possible to supply the heating circuit, and more precisely the short-circuit pipe. 26,31, 38,46 by the pressurized water from the network and, on the other hand, making it impossible to return to the conduit 36 -and therefore to the supply network 11- of a portion of the water circulating in the heating circuit and more precisely in the short-circuit pipe above.

This member 48 is connected to the discharge pipe 25 of the first module by means of discharge sections 49, 50, 51 understood respectively by the first three modules A, B and C and arranged, like the short sections. above circuit, so as to be automatically connected end to end in a sealed and automatic manner by the simple mutual juxtaposition of the three modules considered.

The barrier member 39 is here a valve with two valves 52 and 53 mounted in series on the same rod 54 and adapted to communicate respectively the conduit 36 with a compartment a and the section 38 with a compartment b both crossed by said rod and connected to each other through safety member 48.

A third compartment c disposed between the two compartments a and b and also crossed by the rod 54 is brought into the open air through a conduit 55.

This conduit is used to evacuate to the outside the few drops of water which could leak at the level of the crossings, by the rod 54, of the dividing partitions between, on the one hand, the compartments a and c and, on the other hand, the two compartments b and c , crossed, which are sealed with O-rings or the like 56.

It should be noted that the two valves 52 and 53 are closed simultaneously by actuation of a single rod 54.

This double control constitutes an advantage over known solutions for which the two valves in question correspond to two separate valves which it is necessary to close after each setting in pressure of the central heating installation in water.

The security member 48, sometimes called a "backflow preventer", can be constituted in any manner known per se and is not the subject of the present invention.

This member 48 can be incorporated into module C or attached to it, in particular using screws.

The fourth module D advantageously comprises a relief valve 57 (FIG. 2) mounted on the section 46, this valve being biased towards its closed position by a spring 58 calibrated so that it opens only if it exists in the heating circuit a pressure drop exceeding a given threshold, for example due to the closing of too many thermostatic valves.

The isolation valve 45 fitted to the fourth module D is advantageously fitted with a filter 59 which is easily removable when the valve in question is closed, a filter making it possible to retain impurities coming from the heating circuit and to prevent their sending into the body. boiler heating.

In addition to the four modules A, B, C and D corresponding to the connections of the water circuits, it may be advantageous to add, on the same tie rods 16 as the previous ones, at least one other module.

This is the case for example of the fifth module E comprising an inlet 60 connectable to the piping 4 for external supply of pressurized gas, an outlet 61 connectable to the piping 4 for supplying gas to the burner 2 of the boiler, a conduit 62 connecting this inlet to this outlet and the isolation valve 5 above mounted on said conduit 62.

This is also the case for the sixth module F which is assigned to the various electrical connections of the boiler.

The molded material making up the modules can be different according to the modules, and adapted to the operating temperatures, the modules assigned to a circulation of cold or lukewarm water (C and D) or to the electrical connections (F) can be made of a less efficient material than those assigned to a circulation of hot water (A and B) or that of gas (E).

This material could be a metal such as an aluminum alloy, but is preferably an injected plastic, which has many advantages (economy, lightness, resistance to corrosion ...).

This plastic material is for example a polyether sulfone (commonly called PPS), a polyether imide (PEI) or a polyphenylene sulfone (PES) for modules A, B, C, D and F and even for a peripheral portion of module E, the internal portion of said module E, directly in contact with the gas, then being formed by a metal core.

Said material can also be an epoxy resin to constitute the entire module E.

Each molded module advantageously comprises a prismatic or cylindrical peripheral belt 63 (FIG. 4) whose contour is substantially rectangular with rounded corners, four rectilinear channels 64 respectively disposed at the four corners of this belt and intended to receive the tie rods 16 and a plurality of straight or bent tubular sections T braced by generally flat sails V extending perpendicular to the generatrices of the prism or cylinder defining the belt.

The module which has been shown isolated in perspective in FIG. 4 is module B.

As can be seen in the drawings, all of the connections between the valve strip R and the boiler are arranged on the upper face of this strip while the connections between said strip and the external pipes are for the most part arranged on the rear portion of said strip.

The adoption of such a strip makes it extremely simple to assemble and disassemble the boiler.

To this end, said strip R is previously mounted on a wall, at a relatively great distance from it, for example of the order of 20 cm, using two metal cheeks 66 crossed by the ends of the tie rods 16 .

The connections with the external pipes 21, 14, 12, 43 and 4 can then be easily carried out on the waiting inputs and outputs 20, 29, 35, 42 and 60, behind the bar R, between it and the wall, in particular using screw connections.

The connection of the boiler to the bar R thus mounted and connected is then carried out by placing this boiler above this bar, the ends of the pipes 19, 28, 34, 41 and 4 internal to said boiler opening side by side towards the bottom below it, then lowering the boiler so as to juxtapose suitable connecting members terminating said end pieces against those which are on standby in 18,27,33,40 and 61 and finally by assembling the juxtaposed fittings two by two.

In FIG. 4, we see at 65 a pin which makes such connections easy, a pin which has been described in the patent FRANCE No. 89 08894 of the applicant.

The lowering which has just been described of the boiler on the bar is advantageously guided by the cooperation of pins 67 provided on the top of this bar with complementary housings of the boiler.

Following this, and whatever the embodiment adopted, there is finally a bar of valves for mixed central heating boilers whose constitution results sufficiently from the above.

• possibilité d'effectuer les essais sous pression du circuit de chauffage central sans montage de la chaudière proprement dite,
• simplicité des montages et démontages de cet appareil,
• simplicité de réalisation et de branchement des divers conduits assurant les alimentations des deux circuits de l'installation en eau sous pression,
• simplicité de l'assemblage mutuel des modules,
• longévité, esthétique et économie, ce dernier avantage étant dû en particulier au bas prix des matières plastiques, éventuellement différentes, qui peuvent être adoptées pour constituer les différents modules.

The adoption of this bar has many advantages and in particular the following:

• possibility to carry out pressure tests of the central heating circuit without mounting the boiler itself,
• simplicity of assembly and disassembly of this device,
• simplicity of construction and connection of the various conduits ensuring the supplies of the two circuits of the installation with pressurized water,
• simplicity of mutual assembly of the modules,
• longevity, esthetics and economy, this last advantage being due in particular to the low price of plastics, possibly different, which can be adopted to constitute the various modules.

Claims (9)

1. A connection strip for a dual-purpose central heating and hot water boiler, characterized in that the strip comprises four molded modules (A,B,C,D) assembled side-by-side by mutual juxtaposition and by common tie bars (16) passing therethrough, in that the first module (A) comprises an inlet (18) connectable to the outgoing heating pipework (19) of the boiler, an outlet (20) connectable to outgoing heating pipework (21) leading to the radiators, a duct (22) connecting said inlet to said outlet, a manual stopcock (23) mounted on said duct, a safety valve (24) connecting said duct (22) to a drain (25), and a length of a short-circuit (26) suitable for connecting the above duct (22) to the second module (B), in that this second module (B) comprises an inlet (27) connectable to the outgoing domestic hot water pipework (28) of the boiler, an outlet (29) connectable to outlet domestic hot water pipework (14) for at least one tap (15) for drawing off water, a duct (30) connecting said inlet to said outlet, a length of short-circuit (31) passing through said second module (B) from the first module (A) to the third module (C), and a pressure gauge (32) connected on said length (31), in that the third module (C) comprises an outlet (33) connectable to the incoming domestic cold water pipework (34) of the boiler, an inlet (35) connectable to the pipework (12) for feeding cold water under pressure from the outside, a duct (36) connecting said inlet to said outlet, a stopcock (37) mounted on said duct, a length of short-circuit (38) passing through said third module (C) from the second module (B) to the fourth module (D), and barrier member (39) interposed between said last-mentioned length (38) and the last-mentioned duct (36); and in that the fourth module (D) comprises an outlet (40) connectable to the return heating pipework (41) of the boiler, an inlet (42) connectable to the return heating pipework (43) coming from the radiators, a duct (44) connecting said inlet to said outlet, a stopcock (45) mounted on said duct, and a length of short-circuit (46) suitable for connecting said duct (44) to the length of short circuit (38) of the third module (C), the various modules being organized in such a manner that the various lengths of short-circuit (26,31,38 and 46) included therein are connected end-to-end in watertight manner merely by the modules being juxtaposed.
2. A connection strip according to claim 1, characterized in that the third module (C) is associated with a safety member (48) which is itself connected to the drain (25) of the first module (A) via respective drain lengths (49,50,51) contained in each of the first three modules (A,B,C) and automatically connected end-to-end in watertight manner merely by juxtaposing these three modules.
3. A connection strip according to anyone of the preceding claims, characterized in that the barrier member (39) of the third module (C) is a valve having two valve members (52,53) mounted in series between the domestic cold water feed duct (36) and the length of short-circuit (38) in said third module, and in that said valve is associated with a "disconnector" safety member (48) and with a central compartment (c) connected to the atmosphere and suitable for collecting leaks of water that may occur between the two valve members.
4. A connection strip according to anyone of the preceding claims, characterized in that the fourth module (D) includes a delivery valve (57) mounted on the length of short-circuit (46) of said fourth module, said valve being urged towards a closed position by a spring (58) which is rated in such a manner as to open only if pressure loss exceeding a given threshold exists in the heating circuit (8).
5. A connection strip according to anyone of the preceding claims, characterized in that the stopcock (45) of the fourth module (D) is fitted with a filter (59) that is easily removable when the cock is closed, the filter serving to retain impurities coming from the heating circuit and preventing them being delivered to the heat exchanger of the boiler.
6. A connection strip according to anyone of the preceding claims, characterized in that at least one other molded module is assembled against the assembly of the four above-defined modules (A,B,C,D) using the same tie bars (16) that are used for assembling said four modules, namely a fifth module (E) comprising an inlet (60) connectable to a pipework (4) providing an outside feed of gas under pressure, an outlet (61) connectable to the pipework for feeding the burner (2) of the boiler with gas, a duct (62) connecting said inlet to said outlet, and a stopcock (5) mounted on said duct, and optionally a sixth module (F) for the various electrical connections of the boiler.
7. A connection strip according to anyone of the preceding claims, characterized in that each module (A,B,C,D,E,F) is made of hard plastic, which plastic may differ from one module to another.
8. A connection strip according to anyone of the preceding claims, characterized in that each molded module comprises a prismatic or cylindrical peripheral band (63) whose outline is substantially rectangular with rounded corners, four rectilinear channels (64) being disposed in respective ones of the four corners of said band for receiving the tie bars (16), and a plurality of rectilinear or bent tubular lengths (T) reinforced by generally plane webs (V) extending perpendicularly to the generator lines of a prism or cylinder defining the band.
9. A connection strip according to anyone of the preceding claims, characterized in that the inlets or outlets (18,27,33,40,61) for connection to the boiler are all disposed on a top face of the strip, and in that most of the inlets or outlets (20,29,35,42,60) for connection to external pipework are disposed on the rear face of the strip.

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