Test gases - Test pressures - Appliance categories

This document specifies the test gases, test pressures and categories of appliances relative to the use of gaseous fuels of the first, second and third families. It serves as a reference document in the specific standards for appliances that fall within the scope of the Council Directive on the approximation of the laws of Member States concerning gas appliances 2009/142/EC.
The standard makes recommendations for the use of the gases and pressures to be applied for the tests. The full procedure will be given in the corresponding appliance standards.
NOTE   The test gases and the test pressures specified in this standard are in principle intended to be used with all the appliances in order to establish conformity with the corresponding standards.
However, the use of some test gases and test pressures may not be appropriate in the following cases:
-   appliances with nominal heat input greater than 300 kW;
-   appliances constructed on site;
-   appliances in which the final design is influenced by the user;
-   appliances constructed for use with high supply pressures (notably direct use of the saturated vapour pressure).
In these cases, the specific appliance standards may specify other test conditions in order to establish compliance with their requirements.

Prüfgase - Prüfdrücke - Gerätekategorien

Diese Norm legt die Prüfgase, Prüfdrücke und Gerätekategorien für die Verwendung von Brenngasen der ersten, zweiten und dritten Gasfamilie fest. Sie gilt als übergeordnetes Dokument für die speziellen Gerätenormen, die unter den Geltungsbereich der Richtlinie 2009/142/EG des Rates zur Angleichung der Rechtsvorschriften der Mitgliedstaaten für Gasverbrauchseinrichtungen fallen.
Die Norm enthält Empfehlungen zur Verwendung von Gasen und Drücken bei der Durchführung der Prüfungen. Das vollständige Verfahren wird in den entsprechenden Gerätenormen angegeben.
ANMERKUNG   Die Prüfgase und Prüfdrücke, die in dieser Norm festgelegt werden, sind im Prinzip für sämtliche Geräte bestimmt, um die Konformität mit den entsprechenden Normen sicherzustellen.
Die Verwendung der Prüfgase und Prüfdrücke kann jedoch in folgenden Fällen nicht geeignet sein:
   Geräte mit einer Nennwärmebelastung über 300 kW;
   Geräte, die vor Ort erstellt werden;
   Geräte, deren Endausführung durch den Benutzer beeinflusst wird;
   Geräte, die für einen Betrieb bei hohen Versorgungsdrücken ausgelegt sind (insbesondere die direkte Verwendung des gesättigten Dampfdruckes).
In diesen Fällen können die einzelnen Gerätenormen weitere Prüfbedingungen festlegen, um die Konformität mit den Anforderungen der entsprechenden Normen sicherzustellen.

Gaz d'essais - Pressions d'essais - Catégories d'appareils

Cette norme définit les gaz d'essais, pressions d'essais et catégories d'appareils relatifs à l'utilisation de combustibles gazeux des première, deuxième et troisième familles. Elle sert de document de référence dans les normes particulières aux appareils qui entrent dans le champ d'application de la directive du Conseil relative au rapprochement des législations des États membres concernant les appareils à gaz (2009/142/CE).
La norme donne des recommandations pour l'utilisation des gaz et pressions à appliquer pour les essais. La procédure complète sera indiquée dans les normes particulières d'appareils correspondantes.
NOTE   Les gaz d'essais et les pressions d'essais spécifiés dans cette norme sont, en principe, destinés à être utilisés avec tous les appareils afin d'établir la conformité aux exigences des normes correspondantes.
Néanmoins l'utilisation des gaz d'essais et des pressions d'essais peut ne pas être appropriée dans les cas suivants :
-   appareils de débit calorifique nominal supérieur à 300 kW ;
-   appareils construits sur site ;
-   appareils dont la conception finale est déterminée par l'utilisateur ;
-   appareils construits pour l'utilisation avec de hautes pressions d'alimentation (notamment utilisation directe de la pression de vapeur saturante).
Dans ces cas, les normes particulières d'appareils peuvent spécifier d'autres conditions d'essais afin d'établir la conformité avec leurs exigences.

Preskusni plini - Preskusni tlaki - Kategorije naprav

Ta standard določa preskusne pline, preskusne tlake in kategorije naprav glede na uporabo plinastih goriv prve, druge in tretje družine. Uporablja se kot referenčni dokument v posebnih standardih za naprave, ki spadajo na področje uporabe Direktive Sveta o približevanju zakonodaj držav članic v zvezi z napravami na plinsko gorivo (90/396/ES). Standard daje priporočila za uporabo preskusnih plinov in preskusnih tlakov. Celoten postopek bo podan v ustreznih standardih naprave. OPOMBA:   Preskusni plini in preskusni tlaki, določeni v tem standardu, so načeloma namenjeni uporabi z vsemi napravami za ugotavljanje skladnosti z ustreznimi standardi. Vendar uporaba nekaterih preskusnih plinov in preskusnih tlakov morda ni primerna v naslednjih primerih: – za naprave z nazivno toplotno močjo več kot 300 kW; – za naprave, izdelane na mestu uporabe; – za naprave, pri katerih na končno zasnovo vpliva uporabnik; – za naprave, izdelane za uporabo z visokimi dovodnimi tlaki (zlasti pri neposredni uporabi nasičenega parnega tlaka). V teh primerih se lahko uporabijo posebni standardi za naprave, v katerih so določeni drugi preskusni pogoji za ugotavljanje skladnosti z njihovimi zahtevami.

General Information

Status
Withdrawn
Publication Date
27-Nov-2018
Withdrawal Date
20-Apr-2021
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
21-Apr-2021

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Preskusni plini - Preskusni tlaki - Kategorije napravPrüfgase - Prüfdrücke - GerätekategorienGaz d'essais - Pressions d'essais - Catégories d'appareilsTest gases - Test pressures - Appliance categories91.140.40Sistemi za oskrbo s plinomGas supply systems27.060.20Plinski gorilnikiGas fuel burnersICS:Ta slovenski standard je istoveten z:EN 437:2018SIST EN 437:2019en,fr,de01-april-2019SIST EN 437:2019SLOVENSKI

STANDARDSIST EN 437:2005+A1:20091DGRPHãþD
SIST EN 437:2019
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 437
November
t r s z ICS
t yä r x rä t râ
{ sä s v rä v r Supersedes EN
v u yã t r r u ªA sã t r r {English Version

Test gases æ Test pressures æ Appliance categories Gaz d 5essais æ Pressions d 5essais æ Catégories d 5appareils

Prüfgase æ Prüfdrücke æ Gerätekategorien This European Standard was approved by CEN on

t u June
t r s zä

egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä

translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels

t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

v u yã t r s z ESIST EN 437:2019
EN 437:2018 (E) 2 Contents

Page European foreword ....................................................................................................................................................... 4 1 Scope .................................................................................................................................................................... 5 2 Normative references .................................................................................................................................... 5 3 Terms and definitions ................................................................................................................................... 5 4 Gases .................................................................................................................................................................... 8 4.1 Classification in gas families and groups ................................................................................................ 8 4.2 Test gases ........................................................................................................................................................... 9 5 Test pressures ............................................................................................................................................... 13 6 Classification of appliances ...................................................................................................................... 15 6.1 Appliance categories ................................................................................................................................... 15 6.1.1 General ............................................................................................................................................................. 15 6.1.2 Category I ........................................................................................................................................................ 15 6.1.3 Category II ....................................................................................................................................................... 16 6.1.4 Category III ..................................................................................................................................................... 17 6.2 Operations permitted for a change of gas or pressure, adjustment and regulating devices .............................................................................................................................................................. 18 7 Choice of test gases and test pressures ................................................................................................ 18 8 Marking ............................................................................................................................................................ 19 Annex A (normative)

Conditions for preparation of the test gases ........................................................ 20 Annex B (informative)

National situations ...................................................................................................... 21 B.1 General ............................................................................................................................................................. 21 B.2 Categories listed in the body of the standard marketed in the different countries ............. 21 B.3 Appliance supply pressures corresponding to the categories given in B.1 and B.2 ............ 24 B.4 Special categories marketed nationally or locally ........................................................................... 28 B.4.1 General ............................................................................................................................................................. 28 B.4.2 Categories ....................................................................................................................................................... 33 B.4.2.1 General ............................................................................................................................................................. 33 B.4.2.2 Category I ........................................................................................................................................................ 33 B.4.2.2.1Appliances designed for the use of gases linked to the first family ........................................ 33 B.4.2.2.2 Appliances designed for the use of gases of the second family and the gases linked

to it ................................................................................................................................................................................... 33 B.4.2.2.3 Appliances designed for the use of gases of the third family ................................................... 35 B.4.2.3 Category II ....................................................................................................................................................... 35 B.4.2.3.1 Appliances designed to use gases of the first family or that are linked to it and

gases of the second family or that are linked to it .......................................................................................... 35 B.4.2.3.2 Appliances designed for the use of gases of the second family or that are linked to

it and gases of third family ...................................................................................................................................... 36 SIST EN 437:2019

EN 437:2018 (E) 3 B.4.2.4 Category III ...................................................................................................................................................... 38 B.5 Test gases and test pressures corresponding to the special categories given in B.4 ........... 40 B.6 Special conditions ......................................................................................................................................... 47 B.7 National and local gas distribution specifications relevant for defining appliance categories given in B.4 ................................................................................................................................ 54 Annex C (informative)

Guidelines for extension to other categories ...................................................... 55 Annex D (informative)

National situation of countries whose national bodies are CEN affiliate members .......................................................................................................................................................... 56 D.1 General .............................................................................................................................................................. 56 D.2 Categories listed in the body of the standard and marketed in the different countries ..... 56 D.3 Supply pressures of the appliances ........................................................................................................ 58 Annex E (informative)

Relationship between the distributed gases and the corresponding test gases................................................................................................................................................................... 59 Bibliography .................................................................................................................................................................. 60

SIST EN 437:2019

EN 437:2018 (E) 4 European foreword This document (EN 437:2018) has been prepared by Technical Committee CEN/TC 238 “Test gases, test pressures, appliance categories and gas appliance types”, the secretariat of which is held by AFNOR. 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 May 2019, and conflicting national standards shall be withdrawn at the latest by May 2019. 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 437:2003+A1:2009. EN 437 is intended to provide all the CEN Technical Committees preparing standards on gas appliances with definitions for test gases, test pressures and categories of appliances for use by these committees within the limits of the scope defined in Clause 1. The standard seeks to clarify the present situation with respect to test gases, test pressures and appliance categories. The concern for clarity has led to the elucidation of numerous categories and national situations or conditions. The complexity of the standard is likely to increase as new members join the Union. This standard can be considered as an important stage in the harmonization of test gases, test pressures and appliance categories and the quality of information on gas usage in Europe. This revised European Standard incorporates the previously published amendment and includes new appliance categories, the reason for which is the introduction of modified appliance categories in counties, due to national changes in the gas distribution. The standard also applies to countries whose national standardization body is affiliate member of CEN (see Annex D). Annex B gives national situations relating to gases, gas pressures and appliance categories that apply nationally or locally. The information provided is included under the responsibility of the national standardization bodies. The tables of Annex B give the available information. Therefore Annex B is informative. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 437:2019

EN 437:2018 (E) 5 1 Scope This document specifies the test gases, test pressures and categories of appliances relative to the use of gaseous fuels of the first, second and third families. It serves as a reference document in the specific standards for appliances that fall within the scope of the Council Directive on the approximation of the laws of Member States concerning gas appliances 2009/142/EC. The standard makes recommendations for the use of the gases and pressures to be applied for the tests. The full procedure will be given in the corresponding appliance standards. NOTE The test gases and the test pressures specified in this standard are in principle intended to be used with all the appliances in order to establish conformity with the corresponding standards. However, the use of some test gases and test pressures may not be appropriate in the following cases: — appliances with nominal heat input greater than 300 kW; — appliances constructed on site; — appliances in which the final design is influenced by the user; — appliances constructed for use with high supply pressures (notably direct use of the saturated vapour pressure). In these cases, the specific appliance standards may specify other test conditions in order to establish compliance with their requirements. 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. EN ISO 3166-1:2014, Codes for the representation of names of countries and their subdivisions — Part 1: Country codes (ISO 3166-1:2013) EN ISO 6976:2016, Natural gas — Calculation of calorific values, density, relative density and Wobbe indices from composition (ISO 6976:2016) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — IEC Electropedia: available at http://www.electropedia.org/ — ISO Online browsing platform: available at http://www.iso.org/obp 3.1 gas appliance appliance burning gaseous fuels Note 1 to entry For the purposes of this standard the term “gaseous fuels” means any fuel that is in the gaseous state at a temperature of 15 °C, and under a pressure of 1 bar. SIST EN 437:2019

EN 437:2018 (E) 6 3.2 distributed gases gaseous fuels used on the territory of the CEN members and affiliated members Note 1 to entry This definition corresponds to the one given in the Directive 2009/142/EC on gas appliances (article 2.2). Note 2 to entry The list of CEN members is given in Annex B and the one of affiliated members is given in Annex D. 3.3 test gases gases intended for the verification of the operational characteristics of gas appliances. They consist of reference gases and limit gases 3.4 reference gases test gases with which appliances operate under nominal conditions when they are supplied at the corresponding normal pressure 3.5 limit gases test gases representative of the extreme variations in the characteristics of the gases for which appliances have been designed 3.6 test pressures gas pressures used to verify the operational characteristics of gas appliances. They consist of normal and limit pressures Note 1 to entry The gas pressures used are expressed in millibars (mbar) 1 mbar = 102 Pa. 3.7 normal pressure (pn) pressure under which the appliances operate in nominal conditions when they are supplied with the corresponding reference gas 3.8 limit pressures maximum pressure: pmax; minimum pressure: pmin pressures representative of the extreme variations in the appliance supply conditions 3.9 pressure couple combination of two distinct gas distribution pressures applied by reason of the significant difference existing between the Wobbe indices within a single family or group in which — the higher pressure corresponds only to gases of low Wobbe index; — the lower pressure corresponds to gases of high Wobbe index. Note 1 to entry

3.10 reference conditions these correspond to 15 °C, 1 013, 25 mbar, unless otherwise specified SIST EN 437:2019

EN 437:2018 (E) 7 3.11 relative density (d) ratio of the masses of equal volumes of dry gas and dry air under the same conditions of temperature and pressure: 15 °C or 0 °C and 1 013, 25 mbar 3.12 calorific value quantity of heat produced by the complete combustion, at a constant pressure equal to 1 013,25 mbar, of a unit volume or mass of gas, the constituents of the combustible mixture being taken at reference conditions and the products of combustion being brought back to the same conditions A distinction is made between: — the gross calorific value Hs: the water produced by combustion is assumed to be condensed; — the net calorific value Hi: the water produced by combustion is assumed to be in the vapour state Note 1 to entry The calorific value is expressed: — either in megajoules per cubic metre (MJ/m3) of dry gas under the reference conditions; — or in megajoules per kilogram (MJ/kg) of dry gas. 3.13 Wobbe index gross Wobbe index Ws; net Wobbe index Wi ratio of the calorific value of a gas per unit volume and the square root of its relative density under the same reference conditions. The Wobbe index is said to be gross or net according to whether the calorific value used is the gross or net calorific value Note 1 to entry The Wobbe indices are expressed in megajoules per cubic metre (MJ/m3) of dry gas under the reference conditions. 3.14 heat input (Q) quantity of energy used in unit time corresponding to the volumetric or mass flow rates, the calorific value used being either the net or gross calorific value Note 1 to entry The heat input is expressed in kilowatts (kW). 3.15 nominal heat input (Qn) value of the heat input declared by the manufacturer 3.16 mass flow rate (M) mass of gas consumed by the appliance in unit time during continuous operation Note 1 to entry The mass flow rate is expressed in kilograms per hour (kg/h) or grams per hour (g/h). 3.17 volume flow rate (V) volume of gas consumed by the appliance in unit time during continuous operation SIST EN 437:2019

EN 437:2018 (E) 8 Note 1 to entry The volume flow rate is expressed in cubic metres per hour (m3/h), litres per minute (l/min), cubic decimetres per hour (dm3/h) or cubic decimetres per second (dm3/s). 3.18 gas family group of gaseous fuels with similar burning behaviour linked together by a range of Wobbe indices (see Table 1) 3.19 gas group specified range of Wobbe index within that of the family concerned (see Table 1); this range is determined on the general principle that appliances utilising this gas group would operate safely when burning all gases within this range without adjustments Note 1 to entry Adjustment of the appliance may be permitted in accordance with the special national or local conditions that apply in some countries (see B.4). For gases corresponding to national or local conditions, see Tables B.5, B.6 and B.7. 3.20 appliance category means of identifying the gas families and/or gas groups that a gas appliance is designed to utilize safely and to the desired performance level (see individual appliance standards) Note 1 to entry General appliance categories are described in 6.1. Special appliance categories marketed nationally or locally are described in B.4 and Annex D. 4 Gases 4.1 Classification in gas families and groups Gases are classified into three families, each family may be divided into groups, (themselves being divided into ranges, see Annex B), as a function of the Wobbe index, according to the values given in Table 1. NOTE The classification given in Table 1 is used by Member states for the communication of the types of gas used in their territory according to Article 2.2 of the Gas Appliances Directive 2009/142/EC. SIST EN 437:2019

EN 437:2018 (E) 9 Table 1 — Classification of gas families and groups as a function of the Wobbe indices, dry gas at 15 °C and 1 013,25 mbar Gas families and groups Gross Wobbe index, dry gas at 15 °C and 1 013,25 mbar MJ/m3

Minimum Maximum First family
— Group a 22,4 24,8 Second family

39,1 54,7 — Group H 45,7 54,7 — Group L 39,1 44,8 — Group E 40,9 54,7 Third family

72,9 87,3 — Group B/P 72,9 87,3 — Group P 72,9 76,8 — Group B 81,8 87,3 4.2 Test gases The composition and principal characteristics of the different test gases corresponding to the gas families or groups are given in Tables 2 and 3. In particular cases specified in the individual appliance standards, gas G 24, whose characteristics are given in Table 3, may be used but only at the normal test pressure. The calorific values of the third family gases, expressed in mega joules per cubic metre in Table 2, may also be expressed in mega joules per kilogram of dry gas, as shown in Table 3. The values in Tables 2 and 3, measured and expressed at 15 °C, are derived from EN ISO 6976:2016. The conditions for the preparation of the test gases are given in Annex A. NOTE The characteristics for second family gases at reference conditions other than 15 °C for metering and 15 °C for combustion can be calculated using the coefficients given in EN ISO 13443:2005, Annex A (normative). As an example the characteristics of the reference gases of the second family at 0 °C for metering and for combustion and 1 013,25 mbar (dry gas) are given in Table 4. SIST EN 437:2019

EN 437:2018 (E) 10 Table 2 — Characteristics of the test gases a for the first and second families, gas dry at 15 °C and 1 013,25 mbar Gas family and Group Test gases Designation Composition by volume Wi Hi Ws Hs d

% c MJ/m3 MJ/m3 MJ/m3 MJ/m3
Gases of the first family b Group a Reference gas G 110 CH4 = 26
Incomplete combustion, flame lift and sooting limit gas
H2 = 50 N2 = 24 21,76 13,95 24,75 15,87 0,411
Light back limit gas G 112 CH4 = 17
H2 = 59 19,48 11,81 22,36 13,56 0,367
N2 = 24

Gases of the second family b Group H Reference gas G 20 CH4 = 100 45,67 34,02 50,72 37,78 0,555

Incomplete combustion and sooting limit gas G 21 CH4 = 87 C3H8 = 13 49,60 41,01 54,69 45,28 0,684

Light back limit gas G 222 CH4 = 77 42,87 28,53 47,87 31,86 0,443
H2 = 23
Flame lift limit gas G 23 CH4 = 92,5 41,11 31,46 45,66 34,95 0,586
N2 = 7,5
Over heating limit gas d G 24 CH4 = 68 47,01 35,70 52,09 39,55 0,577
C3H8 = 12
H2 = 20

Group L Reference gas light back limit gas G 25 CH4 = 86 N2 = 14 37,38 29,25 41,52 32,49 0,612

SIST EN 437:2019

EN 437:2018 (E) 11 Gas family and Group Test gases Designation Composition by volume Wi Hi Ws Hs d

% c MJ/m3 MJ/m3 MJ/m3 MJ/m3

Incomplete combustion and sooting limit gas G 26 CH4 = 80 C3H8 = 7 N2 = 13 40,52 33,36 44,83 36,91 0,678

Flame lift limit gas G 27 CH4 = 82 35,17 27,89 39,06 30,98 0,629
N2 = 18
Group E Reference gas G 20 CH4 = 100 45,67 34,02 50,72 37,78 0,555
G 21 CH4 = 87 49,60 41,01 54,76 45,28 0,684
Incomplete combustion and sooting limit gas
C3H8 = 13
Light back limit gas G 222 CH4 = 77 42,87 28,53 47,87 31,86 0,443
H2 = 23
Flame lift limit gas G 231 CH4 = 85 36,82 28,91 40,90 32,11 0,617
N2 = 15
Over heating limit gas d G 24 CH4 = 68 47,01 35,70 52,09 39,55 0,577
C3H8 = 12
H2 = 20

a For gases used nationally or locally, see B.5. b For other groups, see B.5. c See also Annex A. d Limit gas used only for certain types of appliance, specified in the individual appliance standards (e.g. fully premixed burners, forced draught burners, …). SIST EN 437:2019

EN 437:2018 (E) 12 Table 3 — Characteristics of the test gases a for the third family, gas dry at 15 °C and 1 013,25 mbar NOTE The characteristics for second family gases at reference conditions other than 15 °C for metering and 15 °C for combustion can be calculated using the coefficients given in EN ISO 13443:2005, Annex A (normative). As an example the characteristics of the reference gases of the second family at 0 °C for metering and for combustion and 1 013,25 mbar (dry gas) are given in Table 4. Gas family and Group Test gases Designation Composition by volume Wi Hi Ws Hs d

% c MJ/m3 MJ/m3 MJ/kg MJ/m3 MJ/m3 MJ/kg
Gases of the third family b
Reference gas

n-C4H10 = 50 80,58 116,09 45,65 87,33 125,81 49,47 2,075 Groups B/ P Incomplete combustion and sooting limit gas G 30 i- C4H10 = 50

Flame lift limit gas G 31 C3H8 = 100 70,69 88,00 46,34 76,84 95,65 50,37 1,550 and B Light back limit gas G 32 C3H6 = 100 68,14 82,78 45,77 72,86 88,52 48,94 1,476 Group P Reference gas,

Incomplete combustion, flame lift and sooting a limit gas G 31 C3H8 = 100 70,69 88,00 46,34 76,84 95,65 50,37 1,550

Light back and sooting limit gas d G 32 C3H6 = 100 68,14 82,78 45,77 72,86 88,52 48,94 1,476 a For gases used nationally or locally, see B.5. b For other groups, see B.5. c See also Annex A. d Limit gas used only for certain types of appliance, specified in the individual appliance standards (e.g. fully premixed burners, forced draught burners, …). SIST EN 437:2019

EN 437:2018 (E) 13 Table 4 — Characteristics of the reference gases of the second family at 0 °C and 1 013,25 mbar Gas group Test gas Designation Composition by volume Wi Hi Ws Hs

% MJ/m3 MJ/m3 MJ/m3 MJ/m3 d Group H Reference gas G 20 CH4 = 100 48,20 35,90 53,61 39,94 0,555 Group L Reference gas, light back limit gas G 25 CH4 = 86 39,45 30,87 43,88 34,34 0,613

N2 = 14

Group E Reference gas G 20 CH4 = 100 48,20 35,90 53,61 39,94 0,555 5 Test pressures The values of the test pressures, i.e. the static pressure to be applied at the gas inlet connection to the appliance whilst in operation, are given in Tables 5 and 6. NOTE The test conditions are specified in the individual appliance standards. However: — for the combustion test in still air with G 21 the appliance is first adjusted on G 20 to give an increase of 5 % in the nominal heat input where a gas pressure governor exists, and an increase of 7,5 % in the absence of a governor. Gas G 21 is then substituted for G 20 without altering this adjustment; — tests for ignition and crosslighting should be carried out at an inlet pressure of 0,7 times the normal pressure (pn) using the reference gas(es) for the first and second families. SIST EN 437:2019

EN 437:2018 (E) 14 Table 5 — Test pressures where no pressure couple exists a Pressures in millibars Appliance categories having as index Test gas Pn pmin pmax 1st family 1a G 110 8 6 15

G 112
2nd family G 20, G 21, 20 17 25 2H G 222, G 23
2nd family G 25, G 26, 25 20 30 2L G 27
2nd family G 20, G 21, 20 17 25 2E G 222, G 231
G 20, G 21, 20 17 30 2nd family G 222, G 231, G 25, G 26, G 27 a
2N d G 25, G 26, 25 20 30
G 27
G 30, G 31, 29 b 25 35 3rd family G 32
3B/P G 30, G 31, 50 42,5 57,5
G 32

3rd family, 3P G 31, G 32 30 25 35 3rd family G 31, G 32 37 25 45 3P G 31, G 32 50 42,5 57,5 3rd family G 30, G 31, 29 20 35 3B c G 32

a For test pressures corresponding to gases distributed nationally or locally, refer to Table B.5. b Appliances of this category may be used, without adjustment, at the specified supply pressures of 28 mbar to 30 mbar. c The tests with G 31 and G 32 are carried out at the normal pressure only (pn = 29 mbar), these test gases being more severe than any gas distributed. This condition covers the normal variations in the gas supply. d See definition in 6.1.2.3. SIST EN 437:2019

EN 437:2018 (E) 15 Table 6 — Test pressures where a pressure couple exists Pressures in millibars Appliance categories having as index Test gas pn Pmin pmax 2nd family: G 20, G 21, 20 17 25 2E+ G 222, G 231

G25, G26, G27 (25) a 20 b 30 3rd family: 3+ G 30 29 c 20 35 (28– G 31, G 32 37 25 45 3rd family: 3+ G 30 50 42,5 57,5

G 31, G 32 67 50 80 3rd family: 3+ G 30 112 60 140

G 31, G32 148 100 180 a This pressure corresponds to the use of low Wobbe index gas but in principle no test is carried out at this pressure. b See B.6. c Appliances of this category may be used without adjustment at the specified supply pressures of 28 mbar to 30 mbar. 6 Classification of appliances 6.1 Appliance categories 6.1.1 General Appliances are classified into categories defined according to the gases and the pressures for which they are designed. The definition of the categories follows from 6.1.2, 6.1.3 and 6.1.4. In each country, taking account of the local gas distribution conditions (gas composition and supply pressures), only some of the categories defined in 6.1.2, 6.1.3 and 6.1.4 are marketed. In addition, some of these categories are used only for certain types of appliance as specified in the individual standards. The conditions concerning the marketing of these appliance categories in each country and the corresponding supply pressures are given in Tables B.1, B.2 and B.3 (see also B.4 for the categories marketed locally and nationally, corresponding to the gases and specific supply pressures given in Table B.5; B.6 gives the particular conditions specific to certain countries). NOTE See also Annex C - Guidelines for extension to other categories. 6.1.2 Category I 6.1.2.1 General Appliances of category I are designed exclusively for the use of gases of a single family or of a single group. SIST EN 437:2019

EN 437:2018 (E) 16 6.1.2.2 Appliances designed for use on first family gases only Category I1a: appliances using only gases of group a of the first family at the prescribed supply pressure (this category is not used). 6.1.2.3 Appliances designed for use on second family gases only Category I2H: appl

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