EN 437:2018

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

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
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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

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

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

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

% 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
% 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

% 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

% 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

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

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

I3B/P, I3+ G 30 G 30 G 32 G 31 G 30 I3P G 31 G 31 G 32 G 31 G 31,G 32 I3B G 30 G 30 G 32 G 31 G 30 I3R f
II1a2H G 110,G 20 G 21 G 112 G 23 G 21 II2H3B/P, G 20,G 30 G 21 G 222, G 23, G 31 G 30 II2H3+
G 32
II2H3P G 20, G 31 G 21 G 222, G 23, G 31 G 31, G 32
G 32
II2L3B/P G 25, G 30 G 26 G 32 G 27, G 31 G 30 SIST EN 437:2019

G 32
II2E+3P G 20, G 31 G 21 G 222, G 231, G 31 G 31, G 32
G 32
II2R3R g
a For the test gases corresponding to the categories marketed nationally or locally, see Table B.4. b Tests with the limit gases are carried out with the injector and adjustment corresponding to the reference gas of the group to which limit gas used for the test belongs. c The heat inputs shall be equivalent and within the tolerances specified in the appliance standards. d Since the adjustment of the burner changes automatically when the appliance is supplied with different test gases, it may be necessary to examine all phenomena (e.g. incomplete combustion, sooting, light back, flame lift) with all the test gases. e See Table B.6. f See Table B.7. g See Table B.8. 8 Marking The marking of a category comprises: — in Roman numerals, the number of utilizable gas families; — in an Arabic numeral suffix, the number assigned to the gas family considered, i.e. 1 for the first family, 2 for the second and 3 for the third; — in the suffix following that numeral, the capital letter or letters designating the utilizable gas group or groups, respectively. The suffix to the Roman numeral denotes all the families with all the gas groups usable by the appliance, with or without making adjustments and/or adaptations appropriate to each group. In cases where the appliance is capable of using gases belonging to one of the groups E or B/P that completely or partially encompass more restricted groups, the breadth of which is expressed by a Wobbe number range, the supply pressure may be set according to the pressure couple principle. This supply condition for the gas group considered is symbolised by the “+” sign following the letter E or the digit 3 for group B/P; in the latter case, the symbol for the group itself is replaced by the digit 3, which denotes the third family. SIST EN 437:2019

Conditions for preparation of the test gases The composition of the gases used for the tests shall be as close as possible to that in Table 2. For the preparation of these gases, the following rules shall be observed: — the Wobbe index of the gas used shall be within ± 2 % of the value indicated in the table for the corresponding test gas (this tolerance includes the error due to measuring instruments); — the constituents used for the preparation of the mixtures shall have at least the following purity: nitrogen N2 99 %
with a total content of hydrogen, carbon monoxide and
oxygen below 1 % and a total content of nitrogen and
carbon dioxide below 2 % hydrogen H2 99 % methane CH4 95 % propene C3H6 95 % propane C3H8 95 % butane1) C4H10 95 % However, these conditions are not mandatory for each of the components if the final mixture has a composition identical to that of a mixture which would have been made from components satisfying the preceding conditions. Therefore, in order to make up a mixture, it is possible to start with a gas already containing, in suitable proportions, several components of the final mixture. However, for gases of the 2nd family: — for the tests carried out with reference gases G 20 or G 25, a gas belonging respectively to either group H or group L or group E, may be used even if its composition does not satisfy the above conditions, provided that after the addition of either propane or nitrogen as appropriate, the final mixture has a Wobbe index within ± 2 % of the value given in the table for the corresponding reference gas; — for preparation of the limit gases another gas may be used as the base gas instead of methane: — for limit gases G 21, G 222, G 23 and G 24, a natural gas of group H may be used; — for limit gases G 27 and G 231, a natural gas of group H, L or E may be used; — for the limit gas G 26, a natural gas of group L may be used. In all cases the final mixture obtained by adding propane or nitrogen shall have a Wobbe index within ± 2 % of the value given in Table 2 for the corresponding limit gas and the hydrogen content of the final mixture shall be as given in Table 2.
1) A mixture of iso/n butane is permitted. Appliance standards may be more precise on the composition of the mixture and the purity of the gases. SIST EN 437:2019

National situations B.1 General In each country in which this standard applies, appliances may be marketed only if they comply with the particular national supply conditions of that country. In order to permit, both at the time of testing the appliance and at the time of its sale, the correct choice to be made from all the situations covered, the various national situations are summarized in Tables B.1, B.2, B.3, B.4 and B.5. In accordance with EN ISO 3166-1:2014, the names of countries shall be represented by the following codes: AT Austria IE Ireland BE Belgium IS Iceland BG Bulgaria IT Italy CH Switzerland LT Lithuania CY Cyprus LU Luxembourg CZ Czech Republic LV Latvia
MK Republic of Macedonia DE Germany MT Malta DK Denmark NL Netherlands EE Estonia NO Norway ES Spain PL Poland FI Finland PT Portugal FR France RO Romania GB United Kingdom SE Sweden GR Greece SI Slovenia HR Croatia SK Slovakia HU Hungary TR Turkey B.2 Categories listed in the body of the standard marketed in the different countries Tables B.1.and B.2 give the national situations concerning the marketing in the various countries of the appliance categories listed in the body of the standard. The information given in these tables indicates only that these categories may be sold throughout the whole of the country concerned and B.4 has to be consulted for confirmation. In all cases of doubt, the local gas supplier should be consulted in order to identify the precise category applicable. SIST EN 437:2019

x
x
BE
x X
x d x x x
BG (NAv)
CH x
x x x
CY
x x
x
CZ x
x x x x
x DE
x
x a, c x c x
x
x c DK x
x a, c x c x
x c EE x
x x
x ES x
x a x
x x x x FI x
x
FR x b x b
x x a
x a x x x x GB x
x x d x x x x GR x
x a x x x x x x HR x
x
x
HU x c
x
x x
IE x
x x x
IS (NAv)
IT x
x x x x
x LT x
x x x
x LU (NAv)
LV x
MK (NAv)
MT (NAv)
NL
x
x
x
NO x
x x
x PL
x
x x x
x
x PT x
x a x
x x x x RO x x c x
x
x
SE x
x
SI x
x a x x x x
x SIST EN 437:2019
x
x TR x
x x
a Categories applicable only to certain types of appliances, specified in the individual appliance standards. b Categories applicable only to certain types of appliance, submitted to the on-site EC verification procedure; Annex II, article 6 of the gas appliance Directive 2009/142/EC. c See B.6. d Category applicable only for appliances installed in Touring and Motoring Caravans. e Category I2L is a historic category of which there is a number of appliances still in use. The mention NAv (“Not Available”) placed alongside the names of the countries means that the country concerned has not indicated its choice of category. Table B.2 — Category II (double categories) marketed Country code II1a2H II2H3B/P II2H3+ II2H3P a II2L3B/P II2L3P a II2R3R a II2E3B/P II2E+3B/P II2E+3+ II2E+3P a AT
x
x
BE
x a x BG (NAv)
CH
x x x
CY
x x
CZ
x x x
x
DE
x x
DK x x
x
EE
x
x
ES
x c x
x
FI
x
FR
x b
x b x
x a x x GB
x x
GR
x x x
x
HR
x
x
HU (NAv)
IE
x x
IS
...