Roomheaters fired by solid fuel - Requirements and test methods

This European Standard specifies requirements relating to the design, manufacture, construction, safety and performance (efficiency and emission) instructions and marking together with associated test methods and test fuels for type testing residential roomheaters fired by solid fuel.
This Standard is applicable to non-mechanically fired appliances which are listed under categories 1a and 2a of Table 1. These appliances provide heat into the space where they are installed. Additionally, where fitted with a boiler, they also provide domestic hot water and/or central heating. These appliances may burn either solid mineral fuels, peat briquettes, natural or manufactured wood logs or be multi-fuel in accordance with the appliance manufacturer's instructions.
This standard is not applicable to appliances with fan assisted combustion air.

Raumheizer für feste Brennstoffe - Anforderungen und Prüfung

Diese Europäische Norm beschreibt Anforderungen an Auslegung, Herstellung, Ausführung, Sicherheit und Leistungsvermögen (Wirkungsgrad und Emission), Anleitung und Kennzeichnung zusammen mit zugehörigen Prüfverfahren und Prüfbrennstoffen für die Typprüfung von Raumheizern für feste Brennstoffe.
Diese Norm gilt für nicht mechanisch beschickte Feuerstätten, die in Tabelle 1, Kategorie 1a) und 2a), aufgeführt sind. Diese Feuerstätten beheizen den Aufstellungsraum. Sofern sie mit wasserführenden Bauteilen ausgestattet sind, beheizen sie auch Heizwasser und/oder Brauchwasser. Diese Feuerstätten können entsprechend der Bedienungsanleitung des Herstellers entweder feste mineralische Brennstoffe, Torfbriketts, Holzscheite, Holzbriketts oder mehrere dieser Brennstoffe verfeuern. Diese Norm gilt nicht für Feuerstätten mit Verbrennungsluftgebläse.ANMERKUNG   Ohne funktionale Änderung bedeutet eine Veränderung der Verkleidung der Feuerstätte, die die Wärmeabgabe verändert, die Verbrennung jedoch nicht beeinflusst.

Poêles à combustible solide - Exigences et méthodes d'essai

La présente Norme européenne définit les exigences relatives à la conception, à la fabrication, à l'assemblage, à la sécurité, aux performances (rendement et émissions), aux instructions et au marquage ainsi que les méthodes d'essais et combustibles d'essais correspondants pour les essais des poêles domestiques à combustible solide.
La présente norme est applicable aux appareils dépourvus d'alimentation mécanique et qui sont repris sous les catégories 1a et 2a du Tableau 1. Ces appareils produisent de la chaleur dans l'espace où ils sont installés. De plus, lorsqu'ils sont équipés d'un bouilleur, ils produisent également de l'eau chaude à usage domestique et/ou du chauffage central. Ces appareils peuvent utiliser soit des combustibles minéraux solides, des briquettes de tourbe, des bûches de bois naturel ou reconstitué, soit plusieurs combustibles conformément aux instructions du fabricant.
Cette norme ne s'applique pas aux appareils équipés d'un ventilateur pour l'alimentation en air de combustion.
Tableau 1 - Classification des appareils
   a)   b)   c)
   Appareils indépendants ou encastrés sans modification fonctionnelle   Appareils indépendants ou encastrés avec modification fonctionnelle   Appareils encastrés pour niche et enceinte
1   appareils à portes fermées   EN 13240   EN 13229   EN 13229
2   appareils à portes fermées ou ouvertes   EN 13240   EN 13229   EN 13229
3   foyers ouverts sans porte   EN 13229   EN 13229   EN 13229
NOTE   L'expression "sans modification fonctionnelle" signifie une modification de l'habillage d'un appareil, qui ne change que la transmission de la chaleur et n'a aucun effet sur la combustion.
2 Références normatives

Grelniki prostorov na trdna goriva - Zahteve in preskusne metode

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Room heaters fired by solid fuel - Requirements and test methodsGrelniki prostorov na trdna goriva - Zahteve in preskusne metodePoeles a combustible solide - Exigences et méthodes d'essaiRaumheizer für feste Brennstoffe - Anforderungen und Prüfung97.100.30Grelniki na trdo gorivoSolid fuel heatersICS:SIST EN 13240:2003enTa slovenski standard je istoveten z:EN 13240:200101-januar-2003SIST EN 13240:2003SLOVENSKI


EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13240June 2001ICS 97.100.30English versionRoomheaters fired by solid fuel - Requirements and testmethodsPoêles à combustible solide - Exigences et méthodesd'essaiRaumheizer für feste Brennstoffe - Anforderungen undPrüfungThis European Standard was approved by CEN on 7 April 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36

B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13240:2001 E

Page 2EN 13240:2001Contents pageForeword31 Scope42 Normative references43 Terms and definitions64 Materials, design and construction125 Safety requirements196 Performance requirements207 Appliance instructions238 Marking25Annex A (normative) Test methods26Annex B (normative)

Test fuels and recommended fuels59Annex

C (informative) A-deviations64TablesTable 1 - Categorisation of appliances4Table 2 - Steel - Nominal minimum wall thicknesses13Table 3 - Steel material types14Table 4 - Minimum mechanical requirements for cast irons15Table 5 - Cast iron - Minimum wall thicknesses15Table 6 - Minimum thread size designation of flow and return tappings16Table 7 - Minimum depth of tapping or length of thread16Table 8 - Carbon monoxide emission classes21Table 9 - Efficiency at nominal heat output21Table 10 - Minimum refuelling intervals23Table A.1 - Uncertainty of measurement29Table A.2 - Minimum duration, and number of test periods32Table A.3 - Notations and units used in calculations42Table B.1 - Test fuel specifications62Table B.2 - Typical commercial fuel specifications63FiguresFigure 1 - Flue draught values22Figure A.1 - Example of installation of an appliance with vertical flue outlet in the test assembly47Figure A.2 - Example of installation of an appliance with horizontal flue outlet in the test assembly48Figure A.3 - View of trihedron showing general arrangement of walls and test hearth49Figure A.4 - Detail of filler pieces for trihedron rear wall50Figure A.5 - Cross section showing trihedron construction51Figure A.6 - Plan view of trihedron hearth and walls showing position of measurement points52Figure A.7 - Detail of thermocouples in trihedron wall53Figure A.8 - Construction and general arrangement of measurement section54Figure A.9 - Details and dimensions of measurement section for vertical flue outlet55Figure A.10 - Details and dimensions of measurement section for horizontal flue outlet56Figure A.11 - Example of test installation for appliances with water circuit57Figure A.12 - Dimensions of

measurement section for natural draught safety test58Figure B.1 - Flow chart showing selection process for tests on recommended fuels60

Page 3EN 13240:2001ForewordThis European Standard has been prepared by Technical Committee CEN/TC 295 "Residential solid fuelburning appliances", the secretariat of which is held by BSI.This European Standard shall be given the status of a national standard, either by publication of an identicaltext or by endorsement, at the latest by December 2001, and conflicting national standards shall be withdrawnat the latest by December 2002.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark,Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain,Sweden, Switzerland and the United Kingdom.

Page 4EN 13240:20011 ScopeThis European Standard specifies requirements relating to the design, manufacture, construction, safety andperformance (efficiency and emission) instructions and marking together with associated test methods and testfuels for type testing residential roomheaters fired by solid fuel.This Standard is applicable to non-mechanically fired appliances which are listed under categories 1a and 2a ofTable 1. These appliances provide heat into the space where they are installed. Additionally, where fitted with aboiler, they also provide domestic hot water and/or central heating. These appliances may burn either solidmineral fuels, peat briquettes, natural or manufactured wood logs or be multi-fuel in accordance with theappliance manufacturer’s instructions.This standard is not applicable to appliances with fan assisted combustion air.Table 1 - Categorisation of appliancesa)Freestanding or insetappliances withoutfunctional modificationb)Freestanding or insetappliances which havefunctional modificationc)Inset appliancesfor fireplace recess andenclosure1Appliancesoperating withfiredoors closedEN 13240EN 13229EN 132292Appliancesoperating withfiredoors closedor openEN 13240EN 13229EN 132293Open fireswithoutfiredoorsEN 13229EN 13229EN 13229NOTE

Without functional modification means “ modification of the surround of an appliance, that only changes thetransmission of heat, without effect on combustion”. 2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition ofthe publication referred to applies (including amendments).EN 1561:1997Founding - Grey cast ironsEN 1563:1997Founding - Spheroidal graphite cast ironEN 10025:1993Hot rolled products of non-alloy structural steels - Technical delivery conditionsEN 10027-2:1992Designation systems for steels - Part 2: Numerical system

Page 5EN 13240:2001EN 10028-2:1992Flat products made of steels for pressure purposes - Part 2: Non-alloy and alloy steels withspecified elevated temperature propertiesEN 10029:1991Hot rolled steel plates 3 mm thick or above - Tolerances on dimensions, shape andmassEN 10088-2:1995Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip for generalpurposesEN 10111:1998Continuously hot-rolled low carbon steel sheet and strip for cold forming - Technicaldelivery conditionsEN 10120:1996Steel sheet and strip for welded gas cylindersISO 7-1: 1994Pipe threads where pressure-tight joints are made on the threads -Part 1: Dimensions, tolerances and designationISO 7-2:2000Pipe threads where pressure-tight joints are made on the threads -Part 2: Verification by means of limit gaugesISO 228-1:2000Pipe threads where pressure-tight joints are not made on the threads -Part 1: Dimensions, tolerances and designationISO 228-2: 1987Pipe threads where pressure-tight joints are not made on the threads -Part 2: Verification by means of limit gaugesISO 331:1983Coal - Determination of moisture in the analysis sample - Directgravimetric method.ISO 334:1992Solid mineral fuels - Determination of total sulfur - EschkamethodISO 351:1996Solid mineral fuels - Determination of total sulfur - Hightemperature combustion methodISO 501:1981Coal - Determination of the crucible swelling numberISO 562:1998Hard coal and coke - Determination of volatile matterISO 609:1996Solid mineral fuels - Determination of carbon and hydrogen -High temperature combustion methodISO 687:1974Coke - Determination of moisture in the analysis sampleISO 1171:1997Solid mineral fuels - Determination of ash contentISO 1928:1995Solid mineral fuels - Determination of gross calorific value bythe bomb calorimetric method, and calculation of net calorificvalue

Page 6EN 13240:20013 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply.3.1air grillescomponents in the inlet and outlet openings to distribute and direct convection air flow3.2air inlet controlmanual or automatic device which controls the quantity of air supplied for combustion3.3appliance with boilerheat generator consisting of a room heating component and a water heating component in one unit3.4ash content of the fuelsolid matter remaining after the complete combustion of solid fuel3.5ashpanremovable receptacle shaped to receive the residue falling from the firebed3.6ashpitenclosed chamber designed to receive the residue or the ashpan3.7ashpit losspart of the residue which is combustible3.8basic firebedquantity of glowing embers which ensures ignition of the test fuel to be chargedNOTE

The basic firebed may be specified by the manufacturer.3.9boilervessel in which water is heated, intended for fitting in or forming an integral part of a solid fuel appliance3.10boiler fluewayportion of the flueway formed wholly or in part by the surfaces of the boiler3.11bottomgratepart of the appliance at the base of the firebox which supports the firebed through which the residue falls intothe ashpan or ashpit and through which combustion air and/or combustion gases may be drawn

Page 7EN 13240:20013.12bottomgrate bars; firebarsbars supporting the fuelbed, separate or integral with a surrounding frame3.13charging doordoor which covers the refuelling opening3.14combustion airair supplied to the firebox which is entirely or partially used to burn the fuel3.15combustion gasescompounds in gaseous form produced inside an appliance when fuel is burned3.16continuous burning applianceheating appliance designed to provide a source of heat by continuous burning and meeting the requirement ofthe slow combustion test3.17de-ashingprocess of clearing a fuelbed and discharging the residue into the collecting receptacle3.18de-ashing mechanismdevice to agitate or disturb the ash to facilitate its removal from the firebedNOTE

It may also be used to change the bottomgrate operating position on some appliances.3.19direct water systemhot water system in which stored domestic hot water is heated directly by hot water circulating from theboiler3.20draught regulatorinlet device for admission of air downstream of the firebed, enabling the flue draught to be controlled3.21efficiencyratio of total heat output to total heat input during the test period expressed as a percentage during the testperiod3.22firebox; combustion chamberthat part of the appliance in which the fuel is burned3.23firebox openingaperture in the firebox through which an appliance may be fuelled

Page 8EN 13240:20013.24firedoordoor through which the fire may be viewed and which may be opened to allow refuelling of the firebed3.25fireplace enclosureassembly consisting of walls and ceiling of non combustible materials which is built on site to surround a heatgenerator and heat exchanger and to form a space from which hot convection air is emitted into the livingspace. e.g. by air grilles3.26fireplace recessspace formed in a wall or chimney breast constructed from non combustible materials and into which a heatingappliance may be installed and from which a chimney flue leads3.27flue by-pass devicedevice which in the open position allows flue gases to pass directly to the flue spigot/socketNOTE

This can be used as a preheating aid to overcome chimney condensation.3.28flue dampermechanism to change the flow of the combustion gases3.29flue draughtdifferential between the static pressure in the place of installation and the static pressure at the flue gasmeasurement point3.30flue gasesgaseous compounds leaving the appliance flue spigot or socket and entering the flue gas connector3.31flue gas connectorduct through which flue gases are conveyed from the appliance into the chimney flue3.32flue gas mass flowmass of flue gas drawn off from the appliance per unit of time3.33flue gas temperaturetemperature of the flue gas at the specified point in the measurement section3.34flue spigot; flue socketintegral part of the appliance for connecting the flue gas connector thus permitting the deliberate escape ofproducts of combustion into the chimney flue

Page 9EN 13240:20013.35fluewaythat part of an appliance designed to convey combustion gases from the firebox to the flue spigot/socket3.36freestanding applianceappliance designed to operate without

needing to be built into a fireplace recess or fireplace enclosure andwhich is not connected to the building except by the flue gas connector3.37front firebarsgrating or plate fitted at the front of the firebox opening to prevent spillage of fuel and ash or to change thefirebox capacity, or both3.38fuel hopperfuel store integral with the appliance from which fuel is fed to the firebox3.39heat inputquantity of energy which the fuel provides to the appliance3.40heat outputquantity of useful heat released by the appliance3.41indirect water systemhot water system in which stored domestic hot water is heated by a primary heater through which hot waterfrom the boiler is circulated without mixing of the primary (heating) water and the stored domestic hot water3.42inset applianceappliance with or without doors designed to be installed into a fireplace recess or an enclosure, or into a fireboxof an open fire3.43integral fuel storage containerenclosed area forming part of the appliance, but not connected directly to the fuel charging area, in which fuelis stored prior to it being physically transferred by the user to the fuel charging position3.44intermittent burning applianceheating appliance designed to provide a source of heat by intermittent burning and meeting the requirement ofthe reduced combustion testNOTE

An appliance may be either a continuous burning appliance or an intermittent burning appliance according to thefuel used.3.45maximum water operating pressurelimiting water pressure at which the boiler of an appliance can be safely operated

Page 10EN 13240:20013.46nominal heat outputtotal heat output of the appliance quoted by the manufacturer and achieved under defined test conditions whenburning the specified test fuel3.47open fireappliance which is built as an inset and designed to be connected to the building and surrounded by noncombustible materials3.48operating tooldevice supplied with the appliance for handling movable and/or hot components3.49primary aircombustion air which passes through the fuel bed3.50recommended fuelfuel of commercial quality, listed in the appliance manufacturer’s instructions, and shown to achieve theclaimed performance when tested in accordance with this European Standard3.51recovery capabilityability of the fire to re-ignite existing or newly charged fuel after a defined burning period without externalassistance3.52reduced combustion capabilityability of an intermittent burning appliance to continue burning for a minimum period, dependent on appliancetype and fuel burned, without any input of fuel and without any external interference with the combustionprocess, in such a manner that at the end of this period, the firebed can be recovered3.53refuelling intervalperiod of time for which the combustion may be maintained in the appliance with a single load offuel, without intervention by the user3.54residueashes, including combustibles, which collect in the ashpit3.55roomheaterappliance having a fully enclosed firebox with firedoor(s) which are normally closed, that distributes heat byradiation and/or convection and also provides hot water when fitted with a boiler3.56safety heat exchangerdevice which allows excess heat to be released from an appliance

Page 11EN 13240:20013.57slow combustion capabilityability of an appliance to continue operating at a low burning rate for a specified minimum period without anyinput of fuel and without any interference with the combustion process, in such a manner that the basic firebedcan be recovered at the end of this period3.58solid fuelnaturally occurring or manufactured solid mineral fuels, natural or manufactured wood logs and peat briquettes3.59solid mineral fuelcoal, lignite, coke and fuels derived from these3.60space heating outputheat output provided by convection and radiation to the room3.61steady-state conditionstage at which values to be measured in successive equal periods of time do not exhibit significant change3.62surroundoutside components or assembly enclosing the appliance or parts of it3.63test fuelfuel of commercial quality being characteristic of its type to be used for testing appliances3.64thermal discharge controlmechanical device controlled by the water flow temperature which opens a drain in the water circuit of a safetyheat exchanger when a specified flow temperature is attained3.65thermostattemperature sensitive device which automatically changes the air inlet cross-sectional area3.66water heating outputheat output to water, averaged during the test period3.67working surfacesall surfaces of an appliance designed to transmit heat to the surrounding atmosphereNOTE

All external surfaces of a roomheater including the flue gas connector in accordance with this standard are classifiedas working surfaces because they are designed to transmit heat into the room in which they are installed.

Page 12EN 13240:20014 Materials, design and construction4.1 Production documentationThe manufacturer shall state the type of appliance, which he is submitting for test and the laboratory shall testthe appliance using the standard appropriate to that claim.To identify the appliance, the manufacturer shall have available documents and/or scaled assembly drawingsshowing the basic design and construction of the appliance. The documentation and/or the drawings shallinclude at least the following information:- the specification of the materials used in the construction of the appliance;- the nominal heat output in kW using fuels recommended by the manufacturer.If the appliance is fitted with a boiler then the following additional details shall also be specified:- the welding process used in the manufacture of the boiler shell;NOTE

The symbol for the type of weld used is sufficient.- the permissible maximum operating water temperature in °C- the permissible maximum operating pressure in bar;- the type test pressure in bar;- the water heating output in kW.4.1

4.2 Construction4.2.1 General constructionThe shape and dimensions of the components and equipment and the method of design and manufacture and ifassembled on site the method of assembly and installation, shall ensure that when operated as specified inaccordance with the test procedures of this standard and exposed to the associated mechanical, chemical andthermal stresses, the appliance shall operate reliably and safely such that during normal operation nocombustion gas posing a hazard can escape into the room in which the appliance is installed nor can embers fallout. Non-combustible materials shall be used, except that it shall be permissible to use combustible materialsfor the following applications:- components or accessories fitted outside the appliance;- internal components of controls and safety equipment;- operating handles;- electrical equipment.No part of the appliance shall comprise any material known to be harmful.When fired with solid mineral fuels, the appliance shall have a bottomgrate and an ashpan.Component parts, which require periodic replacement and/or removal shall be either so designed or marked foridentification to ensure correct fitting.NOTE 1

Because the entire heat dissipating surfaces of the appliance including the flue spigot/socket and the flue gasconnector are working surfaces, there is no requirement for limiting the surface temperature of the appliance.NOTE 2

All operations which the user carries out, including loading and emptying of the appliance, adjusting controls andde-ashing should be easy, safe and effective.

Page 13EN 13240:20014.2.2 Integral boilerThe boiler shell shall be constructed from cast iron and/or steel and shall be capable of operating at themaximum operating pressure declared by the manufacturer. The integral boiler shall meet the requirements ofA.4.7.The materials and dimensions for the integral boiler construction shall be in accordance with the specificationsgiven in Tables 2 to 7. If alternative materials are used, a certificate giving evidence of similar performance isrequired.Provision shall be made for parts, which form a seal, to be located securely by means of bolts, gaskets orwelding to prevent the leakage of air/water or combustion products. Adjacent surfaces between metalcomponents in the firebox or the flueways shall be gastight. Where a seal is made with fire-cement, cementshall be well supported by adjacent metal surfaces. Boilers constructed of steel4. Welding and welding materialsThe materials used shall be suitable for welding.NOTE

The materials listed in Table 3, are suitable and do not require any additional heat treatment after welding. Nominal minimum wall thicknesses (steel)Boilers constructed of mild steel shall have the appropriate wall thicknesses set out in Table 2.Table 2 - Steel - Nominal minimum wall thicknessesApplicationNon-alloy steelsmmStainless and corrosionresistant steelsmmWalls of the firebox which are in contact with fire and/orwater53Walls of convection heating surfaces outside combustionchamber (except circular tubes)42Circular tubes used in convection part of heat exchanger3,21,5Water cooled grate tubes43Surfaces not in contact with burning fuel or products ofcombustion32NOTE 1The nominal minimum wall thicknesses of Table 2 apply to pressure loaded sheets and tubes other thanimmersion coils, safety heat exchangers.NOTE 2Thinner wall thicknesses are only permissible with proof of equivalent corrosion resistance, heat resistanceand strength.NOTE 3The nominal minimum wall thicknesses listed in Table 2 have been specified taking into consideration:- the maximum water operating pressure (4 bar),- the material properties,- the heat transfer location.

Page 14EN 13240:2001The tolerances on the nominal minimum wall thicknesses for non-alloyed steels given in Table 2 shall be asspecified in EN 10029:1991.Table 3 - Steel material typesEuropean StandardReferencesMaterial TypeMaterial number in accordancewith EN 10027-2:1992EN 10111:1998DD 111.0332DD 121.0398DD 131.0335DD 141.0389EN10025:1993S235JR1.0037S235JRG21.0038S235JO1.0114S235J2G31.0116S275JR1.0044S275JO1.0143S275J2G31.0144S355JR1.0045S355JO1.0553S355J2G31.0570S355K2G31.0595EN 10028-2:1992P235GH1.0345P265GH1.0425P295GH1.0481P355GH1.047316Mo31.541513CrMo4-51.733510CrMo9-101.738010CrMo9-101.7383EN 10120:1996P245NB1.0111P265NB1.0423P3 IONB1.0437P355NB1.0557EN 10088-2:1995X5CrNi 18-101.4301X6CrNi 17-12-21.4401X6CrNiTi l8-101.4541X6CrNiNb 18-101.4550X6CrNiMo Ti 17-12 -21.4571X6CrNiMoNb 17-12 -21.4580X3CrNiMo 17-3-31.4436NOTE

Materials and wall thicknesses other than those specified may only be used on production of appropriateevidence as regards at least their equivalent corrosion resistance, heat resistance and strength to non-alloy steelat the material thicknesses specified in for the particular application/usage.

Page 15EN 13240:20014.2.2.2 Boilers constructed of cast iron4. Cast iron parts subject to water pressureThe mechanical properties of cast iron used for parts subject to water pressure shall, as a minimum, correspondto the values listed in Table 4.Table 4 - Minimum mechanical requirements for cast ironsGrey cast iron (In accordance with EN 1561:1997)- Tensile strength Rm> 150 N/mm2- Brinell hardness160 HB to 220 HBSpheroidal graphite iron (In accordance with EN 1563:1997)- Tensile strength Rm> 400 N/mm2- Elongation18 % A34. Minimum wall thicknesses (cast iron)The wall thickness of the casting section shall be not less than the minimum thicknesses listed in Table 5.Table 5 - Cast iron - Minimum wall thicknessesNominal heat outputkWGrey cast ironmmSpheroidal graphitecast ironmm 303,53,0 30 and

504,03, Boiler shell tappingsThe threads of boiler shell tappings, for flow and return pipes, shall be not less than the minimum thread sizedesignation given in Table 6.Where tapered threads are used, they shall be in accordance with the requirements of ISO 7-1:1994 and ISO 7-2:2000 . Where parallel threads are used, they shall be in accordance with ISO 228-1:2000 and ISO 228-2:1987.The design and position of flow tappings shall be such that air will not be retained within the boiler shell.

Page 16EN 13240:2001Table 6 - Minimum thread size designation of flow and return tappingsNominal heatoutputkWGravitycirculationthread sizedesignation 1)Pumpedcirculationthread sizedesignation 1) 22> 22

35> 35

< 5011¼1½½111) Designation in accordance with ISO 7-1:1994 and ISO 7-2:2000 or ISO 228-1:2000 and ISO 228-2:1987.If boilers are supplied with reducing bushes in horizontal flow tappings, these shall be eccentric and fixed sothat the reduced outlet is uppermost. The minimum depth of tapping or length of thread shall conform toTable 7.Table 7 - Minimum depth of tapping or length of threadThread sizedesignation 1)Minimum depth orlength of threadMm½ to 1¼161½191)

Designation in accordance with ISO 7-1:1994 andISO 7-2:2000 or ISO 228-1:2000 and ISO 228-2:1987.Where a drain socket is provided in the boiler shell, it shall be a minimum thread size designation of ½ andshall be in accordance with ISO 7-1:1994 and ISO 7-2:2000 or ISO 228-1:2000 and ISO 228-2:1987. Boiler waterways4. Design of all boiler waterwaysThe design of the boiler shall ensure a free flow of water through all parts. To minimize the build up ofsediments, sharp or wedge-shaped waterways with a taper towards the bottom shall be avoided.Where inspection holes are provided in the boiler to give access for inspection and cleaning of the waterways,they shall be a minimum of 70 mm x 40 mm or have a minimum diameter of 70 mm and be sealed with a gasketand cap. Boiler waterways used with indirect water systemsThe minimum internal dimension of waterways throughout the main body of the appliance shall be not less than20 mm except where waterways have to be locally reduced to facilitate manufacture or are in areas not in directcontact with burning fuel, in these cases the width of the waterways shall not be less than 15 mm.

Page 17EN 13240:20014. Boiler waterways used with direct water systemsThe minimum internal dimensions of waterways in boilers designed for direct water systems shall be not lessthan 25 mm. Venting of the water sectionsThe boiler and its components shall be designed in such a way that their respective water sections can bevented.The boiler shall be so designed that under normal operation in accordance with the manufacturer's installationinstructions, no undue boiling noises occur. Water tightnessHoles, for screws and similar components, which are used for the attachment or removal of parts, shall not openinto waterways or spaces through which water flows.NOTE

This does not apply to pockets for measuring, control and safety equipment.4.2.3 Cleaning of heating surfacesAll heating surfaces shall be accessible from the flue gas side for inspection and cleaning with brushes, scrapersor chemical agents by means of sufficient cleaning openings. Where cleaning and servicing of the boiler and itscomponents require the use of special tools (e.g. special brushes), these shall be supplied by the appliancemanufacturer.4.2.4 Flue spigot or socketFor horizontal flue connection, the flue spigot/socket shall be designed to allow fitting, internal or external,over a length of at least 40 mm, of a flue gas connector.For vertical flue connection, the fitting shall overlap by at least 25 mm.NOTE

For inset appliances (made for fireplace recesses) with a vertical chimney flue connection and where themanufacturer`s installation instructions specify, in addition to the flue gas connector, that an insulating mortar infill shouldbe added around the connector to seal the appliance to the chimney flue, then in this case it is permissible for the fluespigot/socket overlap to be reduced to a minimum of 6 mm.4.2.5 FluewaysThe size of the flueway in its minimum dimension shall be not less than 30 mm except it shall be permissible toreduce it to not less than 15 mm for appliances designed only to burn fuels other than bituminous coals and peatbriquettes, and where an access door(s) is provided for cleaning the flueway. It shall be possible to clean theflueways of the appliance completely using commercially available tools or brushes, unless special tools orbrushes are provided by the appliance manufacturer.4.2.6 Ashpan and ash removalA means for the removal of the ash residue from the appliance shall be provided. Wh


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