SIST EN 15502-2-2:2025
(Main)Gas-fired central heating boilers - Part 2-2: Specific standard for type B1 appliances
Gas-fired central heating boilers - Part 2-2: Specific standard for type B1 appliances
This document specifies, the requirements and test methods concerning the classification and marking of gas-fired central heating boilers that are fitted with atmospheric burners, fan assisted atmospheric burners and are hereafter referred to as “boilers”.
Where the word boiler is used, this is intended to be read as the boiler including its connecting ducts, ducts and terminals, if any.
This document covers gas-fired central heating boilers type B11, B11BS, B12, B12BS, B13, B13BS:
NOTE 1 For further background information on appliance types see EN 1749:2020.
a) that have a nominal heat input (on the basis of net calorific value) not exceeding 70 kW;
b) that use one or more combustible gases of the three gas families at the pressures stated in EN 437:2021;
c) where the temperature of the heat transfer fluid does not exceed 105 °C during normal operation;
d) where the maximum operating pressure in the water circuit does not exceed 6 bar;
e) which are declared in the technical instructions to be either a “low temperature boiler” or a “standard boiler”. If no declaration is given the boiler is to be considered a “standard boiler”;
f) which are intended to be installed inside a building or in a partially protected place;
g) which are intended to produce also hot water either by the instantaneous or storage principle, as a single unit;
h) which are designed for either sealed water systems or for open water systems.
NOTE 2 This document provides requirements for boilers with known constructions. For boilers with any alternative constructions, which might not fully be covered by this document, the risk associated with this alternative construction needs to be assessed.
An example of an assessment methodology, based upon risk assessment, is given in Clause 11.
This document does not cover all the requirements for:
aa) appliances that are intended to be connected to gas grids where the quality of the distributed gas is likely to vary to a large extent over the lifetime of the appliance (see Annex AB);
ab) appliances using flue dampers;
ac) appliances that have a nominal heat input (on the basis of net calorific value) exceeding 70 kW;
ad) appliances of the types A, B14, B¬2, B3, B4, B5 and C;
ae) appliances intended to be connected to a (common) flue having mechanical extraction;
af) appliances with gas/air ratio control;
ag) modular boilers;
ah) boilers which can give rise to condensation under certain circumstances;
ai) boilers intended to be installed in a room with a foreseeable negative pressure relative to the pressure in the flue system;
aj) surface temperatures of external parts particular to children and elderly people;
ak) appliances that are intended to burn natural gases of the second family where hydrogen is added to the natural gas;
al) boilers intended to be installed in areas accessible to elderly people and children;
am) boilers equipped with an adaptive combustion control function (ACCF).
NOTE Negative pressure relative to the pressure in the flue system can for example be caused by mechanical or thermal ventilation in airtight buildings.
Heizkessel für gasförmige Brennstoffe - Teil 2-2: Heizkessel der Bauart B1
Dieses Dokument legt die Anforderungen und Prüfverfahren für die Einteilung und Kennzeichnung von gasbefeuerten Zentralheizungskesseln fest, die mit atmosphärischen Brennern mit oder ohne Ventilator ausgerüstet sind und nachfolgend kurz „Kessel“ genannt werden.
Wenn das Wort Kessel benutzt wird, soll es als der Kessel einschließlich dessen Verbindungsstücke, Rohre und Windschutzeinrichtung, falls vorhanden, verstanden werden.
Dieses Dokument deckt gasbefeuerte Zentralheizungskessel der Bauarten B11, B11BS, B12, B12BS, B13, B13BS ab:
ANMERKUNG 1 Für weitere Hintergrundinformationen zu Gerätearten siehe EN 1749:2020.
a) die eine Nennwärmebelastung (bezogen auf den Heizwert) von nicht mehr als 70 kW haben;
b) die mit einem oder mehreren brennbaren Gasen der drei Gasfamilien mit den in EN 437:2021 genannten Drücken betrieben werden;
c) bei denen die Temperatur der wärmeleitenden Flüssigkeit unter normalen Betriebsbedingungen 105 °C nicht überschreitet;
d) deren maximaler Betriebsdruck im Wasserkreislauf 6 bar nicht überschreitet;
e) die vom Hersteller entweder als „Niedertemperaturkessel“ oder als „Standardkessel“ bezeichnet werden. Wenn keine Angabe gemacht wird, wird der Kessel als „Standardkessel“ betrachtet;
f) die für die Aufstellung im Inneren eines Gebäudes oder an einem teilweise geschützten Ort vorgesehen sind;
g) die dafür vorgesehen sind, als eine Einheit betrieben nach dem Durchlaufprinzip oder nach dem Speicherprinzip auch Warmwasser herzustellen;
h) die entweder für geschlossene oder für offene Wassersysteme ausgelegt sind.
ANMERKUNG 2 Dieses Dokument enthält Anforderungen an Kessel mit bekannter Bauweise. Für Kessel mit alternativer Bauweise, die eventuell nicht vollständig durch dieses Dokument abgedeckt werden, bedarf das Risiko, das mit dieser alternativen Bauweise verbunden ist, einer Abschätzung.
Ein Beispiel einer auf Risikoanalyse beruhenden Bewertungsmethodik wird in Abschnitt 11 angegeben.
Dieses Dokument behandelt nicht alle Anforderungen an:
aa) Geräte, die dafür ausgelegt sind, an ein Gasnetz angeschlossen zu werden, bei dem die Qualität des verteilten Gases über die Lebensdauer des Gerätes wahrscheinlich stark schwankt (siehe Anhang AB);
ab) Geräte, die Abgasklappen benutzen;
ac) Geräte, die eine Nennwärmebelastung (auf Basis des Heizwerts) nicht über 70 kW haben.
ad) Geräte der Bauarten A, B14, B2, B3, B4, B5 und C;
ae) Geräte, die zum Anschluss an eine (gemeinsame) Abgasanlage mit mechanischer Abgasabführung vorgesehen sind;
af) Geräte mit Brenngas/Luft-Regelung;
ag) modulare Kessel;
ah) Heizkessel, bei denen es unter bestimmten Umständen zu Kondensation kommen kann;
ai) Kessel, die für die Aufstellung in einem Raum mit vorhersehbar negativem Druck gegenüber dem Druck im Abgassystem vorgesehen sind.
aj) Oberflächentemperaturen von Außenteilen insbesondere für Kinder und ältere Menschen;
ak) Geräte, die für die Verbrennung von Erdgas der zweiten Familie bestimmt sind und bei denen dem Erdgas Wasserstoff zugesetzt wird;
al) Kessel, die für die Installation in Bereichen, die für ältere Menschen und Kinder zugänglich sind, vorgesehen sind;
am) Kessel, die mit einer adaptiven Verbrennungsregelung (ACCF, en: adaptive combustion control function) ausgestattet sind.
ANMERKUNG Negativer Druck im Vergleich zum Druck im Abgassystem kann zum Beispiel durch mechanische oder thermische Lüftung in luftdichten Gebäuden hervorgerufen werden.
Chaudières de chauffage central utilisant les combustibles gazeux - Partie 2-2: Norme spécifique pour les appareils de type B1
Le présent document spécifie les exigences et les méthodes d’essai concernant la classification et le marquage des chaudières de chauffage central utilisant les combustibles gazeux et équipées de brûleurs atmosphériques ou de brûleurs atmosphériques assistés d’un ventilateur, ci-après dénommées « chaudières ».
Lorsque le terme chaudière est utilisé, il est destiné à être interprété comme étant la chaudière, y compris ses conduits de raccordement, conduits et terminaux, s’il y a lieu.
Le présent document couvre les chaudières de chauffage central utilisant les combustibles gazeux de types B11, B11BS, B12, B12BS, B13 et B13BS :
NOTE 1 Pour de plus amples informations sur la structure des types d’appareils, voir l’EN 1749:2020.
a) dont le débit calorifique nominal (basé sur le pouvoir calorifique inférieur) est inférieur ou égal à 70 kW ;
b) utilisant un ou plusieurs combustibles gazeux appartenant aux trois familles de gaz et aux pressions indiquées dans l’EN 437:2021 ;
c) dont la température du fluide caloporteur ne dépasse pas 105 °C en fonctionnement normal ;
d) dont la pression maximale de service dans le circuit d’eau ne dépasse pas 6 bar ;
e) déclarées comme étant des « chaudières à basse température » ou des « chaudières standard » dans la notice technique. Si aucune déclaration n’est faite, la chaudière doit être considérée comme une « chaudière standard » ;
f) destinées à être installées dans un bâtiment ou à un emplacement partiellement protégé ;
g) destinées à produire aussi instantanément de l’eau chaude ou capables de la stocker, sous forme monobloc ;
h) conçues pour un système avec circuit d’eau fermé ou ouvert.
NOTE 2 Le présent document fournit des exigences pour les chaudières dont la construction est connue.
Pour les chaudières de construction différente susceptibles de ne pas être traitées par le présent document,
le risque associé à cette construction différente nécessite d’être évalué.
L’Article 11 donne un exemple de méthodologie d’évaluation basée sur l’évaluation des risques.
Le présent document ne couvre pas toutes les exigences concernant :
aa) les appareils destinés à être raccordés à des réseaux de distribution de gaz où la qualité du gaz distribué est susceptible de varier considérablement tout au long de la durée de vie de l’appareil (voir Annexe AB) ;
ab) les appareils utilisant des registres de tirage ;
ac) les appareils dont le débit calorifique nominal (basé sur le pouvoir calorifique inférieur) est supérieur à 70 kW ;
ad) les appareils de types A, B14, B2, B3, B4, B5 et C ;
ae) les appareils destinés à être raccordés à une cheminée (commune) à extraction mécanique ;
af) les appareils avec un dispositif de régulation du rapport air/gaz ;
ag) les chaudières modulaires ;
ah) les chaudières pouvant condenser dans certaines circonstances ;
ai) les chaudières destinées à être installées dans un local avec une pression négative prévisible par rapport à la pression dans le système d’évacuation des produits de combustion ;
aj) les températures de surface des parties extérieures en particulier exposées aux enfants et aux personnes âgées ;
ak) les appareils destinés à brûler des gaz naturels de la deuxième famille lorsque de l’hydrogène est ajouté au gaz naturel ;
al) les chaudières destinées à être installées dans des zones accessibles aux personnes âgées et aux enfants ;
am) les chaudières équipées d’une fonction de contrôle et d’adaptation de la combustion (ACCF).
NOTE Une pression négative par rapport à la pression dans le système d’évacuation des produits de combustion peut par exemple être créée par une ventilation mécanique ou thermique dans des bâtiments hermétiques.
Plinski kotli za centralno ogrevanje - 2-2. del: Poseben standard za tip kotlov B1
Ta evropski standard določa zahteve in preskusne metode v zvezi s klasifikacijo ter označevanjem plinskih kotlov za centralno ogrevanje z nameščenimi atmosferskimi gorilniki ali atmosferskimi gorilniki z ventilatorjem (v nadaljnjem besedilu »kotli«).
Kjer je uporabljena beseda kotel, to pomeni kotel skupaj s povezovalnimi vodi, vodi in terminali, če so prisotni.
Ta dokument je treba uporabljati v povezavi s standardom FprEN 15502-1:2021.
Ta evropski standard zajema plinske kotle za centralno ogrevanje tipov B11, B11BS, B12, B12BS, B13, B13BS:
OPOMBA: Za dodatne informacije o tipih kotlov glej standard EN 1749:2020.
a) z nazivno grelno močjo, ki ne presega 70 kW (glede na neto kurilno vrednost);
b) ki uporabljajo enega ali več gorljivih plinov iz treh družin plinov pri tlakih, navedenih v standardu EN 437:2018;
c) pri katerih temperatura tekočine za prenos toplote pri običajnem obratovanju ne presega 105 °C;
d) pri katerih najvišji obratovalni tlak v vodnem omrežju ne presega 6 barov;
e) ki so v tehničnih navodilih deklarirani kot »nizkotemperaturni kotli« ali »standardni kotli«. Če ni navedene deklaracije, se kotel šteje za »standardni kotel«;
f) ki so namenjeni vgradnji v zgradbi ali delno zaščitenem prostoru;
g) ki so namenjeni ogrevanju vode po načelu pretočnosti ali shranjevanja (kot ena enota);
h) ki so izdelani za zaprte vodne sisteme ali odprte vodne sisteme.
Za uporabo znotraj področja uporabe direktive o tlačni opremi so morda potrebne dodatne zahteve (npr. v primerih, kadar najvišja dovoljena temperatura presega 110 °C ali kadar zmnožek prostornine in najvišjega dovoljenega tlaka presega 50 barov x litri).
OPOMBA: Ta standard določa zahteve za kotle z znanimi konstrukcijami. V zvezi s kotli z drugačnimi konstrukcijami, ki morda niso v celoti zajeti v tem standardu, je treba oceniti tveganje, povezano z drugačno konstrukcijo.
Primer metodologije ocenjevanja, ki temelji na oceni tveganja, je naveden v točki 11.
Ta standard ne obravnava vseh zahtev za:
i) naprave, namenjene povezavi s plinskimi omrežji, v katerih bo kakovost distribuiranega plina med življenjsko dobo naprave verjetno znatno nihala (glej dodatek AB);
j) naprave, ki uporabljajo dimniške lopute;
k) naprave z nazivno grelno močjo, ki presega 70 kW (glede na neto kurilno vrednost);
l) naprave tipov A, B14, B2, B3, B4, B5 in C;
m) naprave, namenjene povezavi z (običajnim) dimnikom, ki ima mehansko ekstrakcijo;
n) naprave z nadzorom razmerja med plinom/zrakom;
o) modularne kotle;
p) kotle, ki lahko pod določenimi pogoji povzročijo kondenzacijo;
q) kotle, namenjene vgradnji v prostor s predvidljivim negativnim tlakom glede na tlak v dimniškem sistemu;
r) površinske temperature zunanjih delov, dostopnih otrokom in starejšim osebam;
s) naprave, ki za delovanje uporabljajo zemeljske pline druge družine, pri čemer je zemeljskemu plinu dodan vodik;
t) kotle, namenjene vgradnji v območjih, dostopnih starejšim osebam in otrokom.
OPOMBA: Negativni tlak glede na tlak v dimniškem sistemu lahko na primer povzroči mehansko ali toplotno prezračevanje v zračno zatesnjenih stavbah.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2025
Nadomešča:
SIST EN 15502-2-2:2014
Plinski kotli za centralno ogrevanje - 2-2. del: Poseben standard za tip kotlov B1
Gas-fired central heating boilers - Part 2-2: Specific standard for type B1 appliances
Heizkessel für gasförmige Brennstoffe - Teil 2-2: Heizkessel der Bauart B1
Chaudières de chauffage central utilisant les combustibles gazeux - Partie 2-2: Norme
spécifique pour les appareils de type B1
Ta slovenski standard je istoveten z: EN 15502-2-2:2024
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
97.100.20 Plinski grelniki Gas heaters
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 15502-2-2
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2024
EUROPÄISCHE NORM
ICS 27.060.30; 91.140.10 Supersedes EN 15502-2-2:2014
English Version
Gas-fired central heating boilers - Part 2-2: Specific
standard for type B1 appliances
Chaudières de chauffage central utilisant les Heizkessel für gasförmige Brennstoffe - Teil 2-2:
combustibles gazeux - Partie 2-2: Norme spécifique Heizkessel der Bauart B1
pour les appareils de type B1
This European Standard was approved by CEN on 17 June 2024.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC 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
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15502-2-2:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 5
Introduction . 8
1 Scope . 9
2 Normative references . 10
3 Terms, definitions and symbols . 10
3.1 Terms and definitions . 10
3.2 Symbols . 10
4 Classification . 10
5 Construction . 10
5.1 General . 10
5.2 Conversion to different gases . 10
5.3 Materials . 11
5.3.1 General . 11
5.3.2 Materials and thicknesses of walls or tubes with water side operating pressure for
boilers of pressure class-3 . 11
5.3.3 Domestic water connections . 11
5.3.4 Thermal insulation . 11
5.3.5 Materials in contact with water for human consumption . 11
5.3.6 Durability against corrosion of metallic combustion product circuits . 11
5.4 Method of construction . 11
5.4.1 Design . 11
5.4.2 Checking the state of operation . 11
5.4.3 Use and servicing . 11
5.4.4 Connections to the gas and water pipes . 11
5.4.5 Soundness . 11
5.4.6 Supply of combustion air and evacuation of the combustion products . 11
5.4.7 Dampers . 12
5.4.8 Air proving . 12
5.4.9 Gas/air ratio controls . 12
5.4.10 Fan . 12
5.4.11 Drainage . 12
5.4.12 Operational safety in the event of failure of the auxiliary energy . 12
5.4.13 Special provision for low temperature boilers and condensing boilers . 12
5.5 Burners . 12
5.6 Pressure test points. 13
5.7 Requirements for the application of control and safety devices . 13
5.8 Additional requirements for modular boilers . 13
6 Electrical and electromagnetic safety . 13
7 Controls . 13
8 Operational requirements . 14
8.1 General . 14
8.1.1 Characteristics of the reference and limit gases . 14
8.1.2 General test conditions . 15
8.2 Soundness . 16
8.2.1 Soundness of the gas circuit . 16
8.2.2 Soundness of the combustion circuit . 16
8.2.3 Soundness of the water circuit. 16
8.2.4 Soundness of the domestic water circuit . 16
8.3 Hydraulic resistance . 16
8.4 Heat inputs and heat output . 16
8.5 Limiting temperatures . 16
8.5.1 General . 16
8.5.2 Limiting temperatures of the adjusting, control and safety devices . 16
8.5.3 Limiting temperatures of the side walls, the front and the top . 17
8.5.4 Limiting temperatures of the test panels and the floor . 17
8.6 Ignition, cross lighting, flame stability. 17
8.6.1 General . 17
8.6.2 Limit conditions . 17
8.6.3 Special flue conditions . 17
8.6.4 Reduction of the gas rate of the ignition burner . 17
8.7 Reduction of the gas pressure . 18
8.8 Defective closure of the gas valve immediately upstream of the main burner . 18
8.9 Pre-purge . 18
8.10 Functioning of a permanent ignition burner when the fan stops during the standby
time . 20
8.11 Adjustment, control and safety devices . 20
8.12 Carbon monoxide. 22
8.13 NO . 23
x
8.14 Special provisions for boilers intended to be installed in a partially protected place. 23
8.15 Formation of condensate . 24
8.16 Temperature of combustion products . 24
8.17 Sound power level L . 24
WA
9 Useful efficiencies . 25
9.1 General . 25
9.2 Useful efficiency at the nominal heat input . 25
9.2.1 Requirements . 25
9.2.2 Tests . 25
9.3 Useful efficiency at part load . 25
9.3.1 Requirements . 25
9.3.2 Tests . 25
9.4 Heat output, seasonal energy efficiency and energy consumption . 26
10 Electric auxiliary energy . 26
11 Risk assessment . 26
12 Marking and instructions . 26
12.1 Boiler marking . 26
12.1.1 Data plate . 26
12.1.2 Markings related to the state of adjustment . 26
12.1.3 Packaging . 26
12.1.4 Warnings notices on the boiler and the packaging . 26
12.1.5 Other information . 26
12.2 Instructions . 27
12.2.1 Instructions for installation . 27
12.2.2 Instructions for use and servicing . 28
12.2.3 Conversion instruction. 28
12.3 Presentation . 28
101 Figures . 29
102 Listing of tables and numbers . 37
103 Annexes . 38
Annex A (informative) Compilation of the test conditions for the various gas families. 39
Annex U (normative) Use of test gases . 44
Annex ZA (informative) Left empty on purpose . 45
Annex ZB (informative) Left empty on purpose . 46
Annex ZC (informative) Left empty on purpose . 47
Annex ZD (informative) Left empty on purpose . 48
Annex ZE (informative) Relationship between this European Standard and the essential
requirements of Regulation (EU) 2016/426 of the European Parliament and of the
Council of 9 March 2016 on appliances burning gaseous fuels and repealing
Directive 2009/142/EC aimed to be covered . 49
Bibliography . 55
European foreword
This document (EN 15502-2-2:2024) has been prepared by Technical Committee CEN/TC 109 “Central
heating boilers using gaseous fuels”, the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by January 2025, and conflicting national standards shall
be withdrawn at the latest by January 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 15502-2-2:2014.
EN 15502-2-2:2014:
I) The main technical changes resulting from the revision of EN 15502-1 into
EN 15502-1:2021+A1:2023 are found in EN 15502-1:2021+A1:2023.
II) Additional changes, not resulting from the revision of EN 15502-1 into EN 15502-1:2021+A1:2023:
a) new or generally reworded requirements:
1) separation between requirements and test methods in to different clauses;
2) changes resulting from moving additional common parts from
EN 15502-2-1:2012+A1:2016 and/or EN 15502-2-2:2014 to EN 15502-1:2021+A1:2023
(for example all definitions used in the parts 2 are moved to part 1; therefore, most of the
definitions in this part are now by reference to part 1);
3) the definitions for instructions for installation, instructions for use and servicing, and
technical documentation are now consequently applied throughout the document;
4) an Annex Z referring to the GAR has been inserted;
5) only “instructions for installation” and “instructions for use and servicing” are defined.
therefore, these are the only instructions to be used in this document;
b) corrected mistakes:
9.2, 9.3 and the relevant subclauses of this document correct two errors present in
EN 15502-2-2:2014 where:
— 9.2.1 Requirements specifies: Shall be according to EN 15502-1:2012, 9.2.1 but these
efficiency requirements are not applicable to boiler < 400 kW.
— 9.3 Useful efficiency at part load specifies: EN 15502-1:2012, 9.3 is not applicable but in
Clause 9.3 there are the following subclauses:
— 9.3.1 Requirements that are not applicable to boilers < 400 kW
— 9.3.2 Tests that are applicable to boilers having any heat input value
c) limitation of the scope compared to the standards superseded by the EN 15502 series (that were
cited in the OJEU under the GAD).
This revision only covers the update from the EN 15502-1 and an addition of an Annex Z referring to the
GAR. This revision aimed not to introduce any new technical content. As some specific requirements are
not covered in EN 15502-2-2:2014 the scope has been modified to clarify this, stating that this document
does not include:
1) specific requirements on surface temperatures of external parts particular to children and elderly
people;
2) specific requirements on appliances that are intended to burn natural gases of the second family
where hydrogen is added to the natural gas;
3) specific requirements for appliances equipped with an adaptive combustion control function.
In fact, these changes are not a change of scope, but a clarification of the scope;
EN 15502 consists of the following parts under the general title “Gas-fired heating boilers”:
— Part 1: General requirements and tests;
— Part 2-1: Specific standard for type C appliances and type B2, B3 and B5 appliances of a nominal heat
input not exceeding 1 000 kW;
— Part 2-2: Specific standard for type B1 appliances.
This document (Part 2-2) is used in conjunction with Part 1.
Relationship between this document and EN 15502-1, Gas-fired heating boilers — Part 1: General
requirements and tests:
This document is used in conjunction with EN 15502-1:2021+A1:2023 and follows the numbering
structure of EN 15502-1:2021+A1:2023.
Where this document states:
— shall be according to EN 15502-1:2021+A1:2023 (clause number) with the following modification;
— shall be according to EN 15502-1:2021+A1:2023 (clause number) with the following addition;
— EN 15502-1:2021+A1:2023 (clause number) is replaced by the following;
— EN 15502-1:2021+A1:2023 (clause number) is not applicable;
the relevant text of EN 15502-1:2021+A1:2023 is intended to be adapted accordingly.
This document adds clauses or subclauses to the structure of EN 15502-1:2021+A1:2023 which are
particular to this Part 2 standard. It should be noted that these clauses and subclauses are not indicated
as an addition. Clauses, subclauses and annexes which are additional to those in
EN 15502-1:2021+A1:2023 are numbered starting from 101, or designated as Annex XA, XB, XC, etc.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZE, which is an integral part of this
document.
NOTE For applications within the scope of the PED further requirements can be necessary (e.g. situations
where the maximum allowable temperature exceeds 110 °C, or where volume times maximum allowable pressure
is over 50 bar x litres).
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
Introduction
The basic function of gas-fired heating boiler is to generate heat by direct heat transfer in a heat
exchanger, from the combustion gasses to the water.
The boiler can include in one design more than one function. It can include for example:
— a sanitary hot water function;
— a function to supply the combustion air from the outside/open air;
— a function to dispose the combustion products to the outside/open air.
The boiler design can be supplied to the market in more than one part. If the boiler is supplied to the
market in multiple parts, the boiler is the assembly of various parts according to the instructions for
installation.
Boilers can be designed to be connected to specific parts of a building. Connection to a chimney and the
means of combustion air supply is particularly relevant.
Matters related to quality assurance systems, tests during production, and certificates of conformity of
auxiliary devices are not dealt with in this series of European standards.
1 Scope
This document specifies, the requirements and test methods concerning the classification and marking
of gas-fired central heating boilers that are fitted with atmospheric burners, fan assisted atmospheric
burners and are hereafter referred to as “boilers”.
Where the word boiler is used, this is intended to be read as the boiler including its connecting ducts,
ducts and terminals, if any.
This document covers gas-fired central heating boilers type B , B , B , B , B , B :
11 11BS 12 12BS 13 13BS
NOTE 1 For further background information on appliance types see EN 1749:2020.
a) that have a nominal heat input (on the basis of net calorific value) not exceeding 70 kW;
b) that use one or more combustible gases of the three gas families at the pressures stated in
EN 437:2021;
c) where the temperature of the heat transfer fluid does not exceed 105 °C during normal operation;
d) where the maximum operating pressure in the water circuit does not exceed 6 bar;
e) which are declared in the technical instructions to be either a “low temperature boiler” or a “standard
boiler”. If no declaration is given the boiler is to be considered a “standard boiler”;
f) which are intended to be installed inside a building or in a partially protected place;
g) which are intended to produce also hot water either by the instantaneous or storage principle, as a
single unit;
h) which are designed for either sealed water systems or for open water systems.
NOTE 2 This document provides requirements for boilers with known constructions. For boilers with any
alternative constructions, which might not fully be covered by this document, the risk associated with this
alternative construction needs to be assessed.
An example of an assessment methodology, based upon risk assessment, is given in Clause 11.
This document does not cover all the requirements for:
aa) appliances that are intended to be connected to gas grids where the quality of the distributed gas is
likely to vary to a large extent over the lifetime of the appliance (see Annex AB);
ab) appliances using flue dampers;
ac) appliances that have a nominal heat input (on the basis of net calorific value) exceeding 70 kW;
ad) appliances of the types A, B , B , B , B , B and C;
14 2 3 4 5
ae) appliances intended to be connected to a (common) flue having mechanical extraction;
af) appliances with gas/air ratio control;
ag) modular boilers;
ah) boilers which can give rise to condensation under certain circumstances;
ai) boilers intended to be installed in a room with a foreseeable negative pressure relative to the
pressure in the flue system;
aj) surface temperatures of external parts particular to children and elderly people;
ak) appliances that are intended to burn natural gases of the second family where hydrogen is added to
the natural gas;
al) boilers intended to be installed in areas accessible to elderly people and children;
am) boilers equipped with an adaptive combustion control function (ACCF).
NOTE Negative pressure relative to the pressure in the flue system can for example be caused by mechanical
or thermal ventilation in airtight buildings.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
In this document the normative references of EN 15502-1:2021+A1:2023 are valid. Furthermore, the
following normative reference is valid.
EN 15502-1:2021+A1:2023, Gas-fired heating boilers - Part 1: General requirements and tests
3 Terms, definitions and symbols
3.1 Terms and definitions
Shall be according to EN 15502-1:2021+A1:2023, 3.1.
3.2 Symbols
Shall be according to EN 15502-1:2021+A1:2023, 3.2.
4 Classification
Shall be according to EN 15502-1:2021+A1:2023, Clause 4.
5 Construction
5.1 General
Shall be according to EN 15502-1:2021+A1:2023, 5.1.
5.2 Conversion to different gases
Shall be according to EN 15502-1:2021+A1:2023, 5.2.
5.3 Materials
5.3.1 General
Shall be according to EN 15502-1:2021+A1:2023, 5.3.1 with the following addition:
If there is a risk of condensation in the combustion products circuit it shall comprise materials which
comply with the requirements of EN 15502-1:2021+A1:2023, 5.4.13.1. Other materials may be used
when evidence is provided of their suitability for conditions in which condensation can occur.
5.3.2 Materials and thicknesses of walls or tubes with water side operating pressure for boilers
of pressure class-3
Shall be according to EN 15502-1:2021+A1:2023, 5.3.2.
5.3.3 Domestic water connections
Shall be according to EN 15502-1:2021+A1:2023, 5.3.3.
5.3.4 Thermal insulation
Shall be according to EN 15502-1:2021+A1:2023, 5.3.4.
5.3.5 Materials in contact with water for human consumption
Shall be according to EN 15502-1:2021+A1:2023, 5.3.5.
5.3.6 Durability against corrosion of metallic combustion product circuits
Shall be according to EN 15502-1:2021+A1:2023, 5.3.6.
5.4 Method of construction
5.4.1 Design
Shall be according to EN 15502-1:2021+A1:2023, 5.4.1.
5.4.2 Checking the state of operation
Shall be according to EN 15502-1:2021+A1:2023, 5.4.2.
5.4.3 Use and servicing
Shall be according to EN 15502-1:2021+A1:2023, 5.4.3.
5.4.4 Connections to the gas and water pipes
Shall be according to EN 15502-1:2021+A1:2023, 5.4.4.
5.4.5 Soundness
Shall be according to EN 15502-1:2021+A1:2023, 5.4.5.
5.4.6 Supply of combustion air and evacuation of the combustion products
Shall be according to EN 15502-1:2021+A1:2023, 5.4.6.
5.4.7 Dampers
EN 15502-1:2021+A1:2023, 5.4.7 is not applicable.
5.4.8 Air proving
EN 15502-1:2021+A1:2023, 5.4.8 is replaced with the following:
Boilers with fans (type B , B , B and B ) shall be fitted with a system for air proving.
12 12BS 13 13BS
Before each fan start it shall be checked that there is no simulation of air flow in the absence of air flow.
The system for supervision of the combustion air rate or combustion products rate is activated directly
by the flow of combustion air or combustion products. This is also valid for boilers with more than one
fan speed in which the flows associated with each fan speed are monitored.
The supply of combustion air shall be checked by continuous supervision of the combustion air rate or
combustion products rate.
5.4.9 Gas/air ratio controls
EN 15502-1:2021+A1:2023, 5.4.9 is not applicable.
5.4.10 Fan
Shall be according to EN 15502-1:2021+A1:2023, 5.4.10.
5.4.11 Drainage
Shall be according to EN 15502-1:2021+A1:2023, 5.4.11.
5.4.12 Operational safety in the event of failure of the auxiliary energy
Shall be according to EN 15502-1:2021+A1:2023, 5.4.12.
5.4.13 Special provision for low temperature boilers and condensing boilers
5.4.13.1 Materials in contact with condensate
Shall be according to EN 15502-1:2021+A1:2023, 5.4.13.1.
5.4.13.2 Discharge of condensate
EN 15502-1:2021+A1:2023, 5.4.13.2 is not applicable.
5.4.13.3 Control of the combustion products temperature
EN 15502-1:2021+A1:2023, 5.4.13.3 is not applicable.
5.4.13.4 Chemical composition of the condensate
EN 15502-1:2021+A1:2023, 5.4.13.4 is not applicable.
5.4.13.5 Design
EN 15502-1:2021+A1:2023, 5.4.13.5 is not applicable.
5.5 Burners
Shall be according to EN 15502-1:2021+A1:2023, 5.5.
5.6 Pressure test points
Shall be according to EN 15502-1:2021+A1:2023, 5.6.
5.7 Requirements for the application of control and safety devices
Shall be according to EN 15502-1:2021+A1:2023, 5.7 with the following addition:
5.7.101 Combustion products discharge safety device
Boilers shall be so constructed that in abnormal draught conditions there is no release of combustion
products in a dangerous quantity into the room concerned.
For type B , B and B boilers, this can be achieved with a combustion products discharge safety
11 12 13
device (in this case type B , B , and B boilers are designated respectively as type B , B , and
11 12 13 11BS 12BS
B boilers).
13BS
However, type B , B and B boilers installed either in the open air or in a room separated from living
11 12 13
rooms and provided with appropriate ventilation directly to the outside, might not be fitted with such a
device but in this case, appropriate warnings on the packaging and in the instructions shall clearly
indicate the limit on the use of this type of boiler; in this case the boiler is designated as a type B , B
11 12
or B boiler.
5.8 Additional requirements for modular boilers
EN 15502-1:2021+A1:2023, 5.8 is not applicable.
6 Electrical and electromagnetic safety
Shall be according to EN 15502-1:2021+A1:2023, Clause 6.
7 Controls
Shall be according to EN 15502-1:2021+A1:2023, Clause 7 with the following addition:
7.101 Combustion products safety discharge device
7.101.1 Construction requirements
7.101.1.1 Electro-mechanical devices
The device shall be so designed that it cannot be dismantled without a tool.
The device shall be non-adjustable. Means of adjustment that are sealed are considered to be non-
adjustable.
Incorrect refitting of the device, after servicing, shall not be possible.
The device shall be designed so that the electrical insulation withstands the thermal stresses resulting
from spillage of the combustion products.
Interruption of the link between the sensor and the device responding to its signal or destruction of the
sensor shall at least cause safety shutdown within the reaction time as stated in the technical and user’s
instruction for the device. Where safety shutdown occurs, automatic restart shall only be possible after a
minimum waiting time of 10 min. The actual waiting time of the boiler shall be stated in the Installation
and Operating Instructions.
The device shall comply with the electrical requirements of 3.4.1 of Annex EE of EN IEC 60730-2-9:2019 .
7.101.1.2 Electronic devices
For combustion products safety discharge devices and their sensors that make use of electronics,
EN 16830:2022 applies.
Where safety shutdown occurs, automatic restart shall only be possible after a minimum waiting time of
10 min. The actual waiting time of the boiler shall be stated in the technical and user’s instruction.
7.101.2 Performance
7.101.2.1 Reaction time
7.101.2.1.1 Requirement:
With the sensing element exposed to the switch off temperature as stated in the technical and user’s
instruction, the combustion products safety discharge device shall cause at least safety shutdown within
the reaction time as stated in the technical and user’s instruction of the control device.
The shutdown time (specified in 8.11.102.3) can only be determined in the application and is the result
of the specified reaction time and switch-off temperature of the Combustion Products Safety Discharge
Device, in combination with a specific location of this device near the draft hood.
For specific requirements and tests on electronic Combustion Products Safety Discharge Devices and
their sensors, EN 16830:2022 shall apply.
7.101.2.1.2 Test:
After having conditioned the sensing element of the combustion products safety discharge device at
ambient temperature, insert this sensing element into a water bath that is set to the switch-off
temperature as stated in the Technical and user’s instruction.
Measure the time period between the moment that the sensing element is inserted into the water bath
and the moment that the contact of the combustion products safety discharge device switches.
7.101.2.2 Endurance
7.101.2.2.1 Requirement:
After the test as described below, the device shall comply with the requirements of 7.101.2.1.
For specific endurance requirements and tests on electronic combustion products safety discharge
devices and their sensors, EN 16830:2022 shall apply.
7.101.2.2.2 Test:
Cycle the sensing element of the device for 1 000 cycles between ambient temperature and maximum
operating temperature as stated in the technical and user’s instruction and measure the reaction time
according to 7.101.2.1.
8 Operational requirements
8.1 General
8.1.1 Characteristics of the reference and limit gases
Shall be according to EN 15502-1:2021+A1:2023, 8.1.1.
As impacted by EN IEC 60730-2-9:2019/A1:2019 and EN IEC 60730-2-9:2019/A2:2019.
8.1.2 General test conditions
8.1.2.1 Installation of the boiler
Shall be according to EN 15502-1:2021+A1:2023, 8.1.2.1 with the following addition:
The boiler is subjected to the draught created by a test flue of the minimum height stated in the technical
instructions, or of 1 m height where no minimum is stated in the instructions. The internal diameter of
the test flue shall be equal to the smallest diameter stated in the technical instructions. The thickness of
the flue is less than 1 mm. If the diameter of the boiler flue outlet does not correspond to the external
diameter in local use, a linking piece of thickness 1 mm is used to adapt the flue outlet diameter to the
diameter of the test flue.
The height of the flue is measured:
a) for a boiler having a flue outlet with a horizontal axis, from this axis;
b) for a boiler having a flue outlet with a vertical axis, from the plane of the flue outlet.
The test is carried out with one of the reference gases, or a gas actually distributed, for the category
concerned at nominal heat input.
The combustion products are sampled at a point in the flue 0,15 m from the top, using the probe shown
in Figures 101 or 102.
Tables representing the summary of the test gas supply conditions for the main tests which are carried
out on the boilers with first, second and third family gases are given in the informative Annex I.
8.1.2.2 Gases used for testing
Shall be according to EN 15502-1:2021+A1:2023, 8.1.2.2.
8.1.2.3 Conduct of the test to obtain a heat input
Shall be according to EN 15502-1:2021+A1:2023, 8.1.2.3.
8.1.2.4 Water circuit
Shall be according to EN 15502-1:2021+A1:2023, 8.1.2.4.
8.1.2.5 Thermal equilibrium
Shall be according to EN 15502-1:2021+A1:2023, 8.1.2.5.
8.1.2.6 General test conditions for combination boilers
Shall be according to EN 15502-1:2021+A1:2023, 8.1.2.6.
8.1.2.7 Electrical supply
Shall be according to EN 15502-1:2021+A1:2023, 8.1.2.7.
8.1.2.8 Tolerances of measurements
Shall be according to EN 15502-1:2021+A1:2023, 8.1.2.8.
8.2 Soundness
8.2.1 Soundness of the gas circuit
Shall be according to EN 15502-1:2021+A1:2023, 8.2.1.
8.2.2 Soundness of the combustion circuit
Shall be according to EN 15502-1:2021+A1:2023, 8.2.2 with the following addition:
8.2.2.101 Type B
8.2.2.101.1 Requirements:
Under the test conditions below, combustion products shall only escape from the flue outlet.
8.2.2.101.2 Test conditions:
The boiler, installed as described in 8.1.2, is connected to a 1 m test flue, except for wall-mounted boilers
for which a 0,50 m test flue is used, unless the technical instruction specifies that the test shall be carried
out on a 1 m flue (see 12.2.1.4 h)). The sampling probe is removed. The test is carried out with one of the
reference gases, or a gas actually distributed, for the category concerned at nominal heat input.
Possible leaks are looked for with a dew point plate, whose temperature is maintained at a value slightly
above the dew point of the ambient air. The plate is brought near to all the places around the draft diverter
where a leak is suspected.
In doubtful cases, however, leaks are looked for with a sampling probe connected to a rapid-response
CO analyser enabling contents of the order of 0,2 vol% to be detected.
In this case, precautions shall be taken to ensure that sampling does not interfere with the normal
evacuation of the combustion products.
8.2.3 Soundness of the water circuit
Shall be according to EN 15502-1:2021+A1:2023, 8.2.3.
8.2.4 Soundness of the domestic water circuit
Shall be according to EN 15502-1:2021+A1:2023, 8.2.4.
8.3 Hydraulic resistance
Shall be according to EN 15502-1:2021+A1:2023, 8.3.
8.4 Heat inputs and heat output
Shall be according to EN 15502-1:2021+A1:2023, 8.4.
8.5 Limiting temperatures
8.5.1 General
Shall be according to EN 15502-1:2021+A1:2023, 8.5.1.
8.5.2 Limiting temperatures of the adjusting, control and safety devices
Shall be according to EN 15502-1:2021+A1:2023, 8.5.2.
8.5.3 Limiting temperatures of the side walls, the front and the top
Shall be according to EN 15502-1:2021+A1:2023, 8.5.3 with the following
...
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