1、BSI Standards PublicationBS EN 26:2015Gas-fired instantaneous waterheaters for the production ofdomestic hot waterBS EN 26:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 26:2015. It supersedes BS EN 26:1998 which is withdrawn.The UK participation in its pr
2、eparation was entrusted to Technical Committee GSE/29, Gas-fired central heating boilers (domestic and non-domestic) and domestic gas-fired water heaters.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all
3、 the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 77034 0 ICS 91.140.10 Compliance with a British Standard cannot confer immunity from legal obligations.This British
4、 Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 26 May 2015 ICS 91.140.10 Supersedes EN 26:1997English Version Gas-
5、fired instantaneous water heaters for the production of domestic hot water Appareils de production instantane deau chaude pour usages sanitaires utilisant les combustibles gazeux Gasbeheizte Durchlauf-Wasserheizer fr den sanitren Gebrauch This European Standard was approved by CEN on 29 November 201
6、4. 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 o
7、n 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-CENE
8、LEC 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Ital
9、y, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Aven
10、ue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 26:2015 EBS EN 26:2015EN 26:2015 (E) 2 Contents Page Foreword 7 1 Scope 9 2 Normative references 9 3 Terms and definitions 12 4 Classification of wa
11、ter heaters 25 4.1 General . 25 4.2 Classification of gases . 25 4.3 Appliance categories 26 4.4 Mode of supply of the combustion air and evacuation of the combustion products (appliance types). 26 4.5 Water pressure 26 4.5.1 General . 26 4.5.2 Low pressure appliances . 26 4.5.3 Normal pressure appl
12、iances 26 4.5.4 High pressure appliances 26 5 Constructional requirements . 26 5.1 Conversion to different gases . 26 5.1.1 Introduction . 26 5.1.2 General . 26 5.1.3 Materials 27 5.1.4 Design - Assembly - Strength 29 5.1.5 Accessibility - Ease of maintenance - Fitting and removal 30 5.1.6 Gas conne
13、ctions . 30 5.1.7 Means of achieving soundness . 30 5.1.8 Supply of combustion air and evacuation of the combustion products 31 5.1.9 Checking the state of operation 35 5.1.10 Drainage . 35 5.1.11 Electrical safety. 35 5.1.12 Operational safety in the event of failure of the auxiliary energy 37 5.2
14、Adjusting, control and safety devices 37 5.2.1 General . 37 5.2.2 Manual shut off valves and/or gas rate adjusters . 38 5.2.3 Preset gas rate adjusters . 38 5.2.4 Gas pressure regulator 39 5.2.5 Pressure test points . 39 5.2.6 Automatic water-operated gas valve 39 5.2.7 Ignition devices . 39 5.2.8 F
15、lame supervision device 41 5.2.9 Atmosphere sensing device for type AASappliances . 42 5.2.10 Combustion products discharge safety device for type B11BS, B12BSand B13BSappliances 42 5.2.11 Protection against accidental overheating of thermostatic appliances . 43 5.2.12 Composition of the gas circuit
16、 43 5.2.13 Protection against frost for appliances intended to be installed in a partially protected place . 43 5.2.14 Protection against the ingress of rain 44 5.3 Main burner . 44 5.4 Supplementary requirements for condensing water heaters 44 5.4.1 Materials in contact with condensate . 44 5.4.2 D
17、ischarge of condensate . 44 BS EN 26:2015EN 26:2015 (E) 3 5.4.3 Control of the combustion products temperature . 45 5.4.4 Chemical composition of the condensate 45 6 Operational requirements . 45 6.1 General . 45 6.1.1 Introduction 45 6.1.2 Characteristics of the test gases . 45 6.1.3 Requirements f
18、or preparation of the test gases 45 6.1.4 Choice of test gases 45 6.1.5 Test pressures . 45 6.1.6 General test conditions . 46 6.2 Soundness . 50 6.2.1 Soundness of the gas circuit . 50 6.2.2 Soundness of the combustion circuit and evacuation of the combustion products . 51 6.2.3 Soundness of the wa
19、ter circuit 56 6.3 Heat inputs . 56 6.3.1 General . 56 6.3.2 Nominal heat input 58 6.3.3 Minimum heat input . 59 6.4 Temperature of the control knobs . 59 6.4.1 Requirements . 59 6.4.2 Test . 59 6.5 Temperature of the adjustering, control and safety devices 60 6.5.1 Requirement . 60 6.5.2 Test . 60
20、6.6 Temperature of the appliance casing, the surface on which it is installed and adjacent surfaces and external temperature of the ducts 60 6.6.1 Requirements . 60 6.6.2 Tests . 61 6.7 Ignition - Cross-lighting - Flame stability 61 6.7.1 Operation in still air for all appliances 61 6.7.2 Supplement
21、ary tests for appliances of types AASand B1except for B14. 63 6.7.3 Supplementary tests for type C11appliances and outdoors and/or partially protected appliances 64 6.7.4 Supplementary tests for type C2appliances 65 6.7.5 Supplementary tests for appliances of types C12, C13, C32, C33, B4and B566 6.7
22、.6 Supplementary tests for type C42and type C43appliances . 66 6.7.7 Supplementary tests for type C52and type C53appliances . 67 6.7.8 Supplementary tests for type C6appliances 67 6.7.9 Supplementary tests for type C72and type C73appliances . 67 6.7.10 Supplementary tests for type C82and type C83app
23、liances . 67 6.7.11 Functioning of a permanent ignition burner when the fan stops during the standby time . 68 6.7.12 Air proving device for fan assisted water heaters . 68 6.7.13 Functioning of the fan of types C42and C43water heaters 72 6.7.14 Protection against the accumulation of gas in the comb
24、ustion circuit . 72 6.7.15 Leakage of combustion products from type C7water heaters 73 6.7.16 Supplementary tests for type B14, B2and B3water heaters 74 6.8 Adjusting, control and safety devices . 74 6.8.1 General . 74 6.8.2 Control devices 74 6.8.3 Closing mechanisms and the automatic water operate
25、d gas valve 75 6.8.4 Ignition devices . 76 6.8.5 Safety times . 77 6.8.6 Pressure regulator . 80 6.8.7 Adjustment of the water rate - Maximum water temperature (all appliances) 81 6.8.8 Overheating of the water 81 6.8.9 Effectiveness of the protection against accidental overheating of thermostatic a
26、ppliances . 81 BS EN 26:2015EN 26:2015 (E) 4 6.8.10 Atmosphere sensing device for type AASappliances . 82 6.8.11 Combustion products discharge safety device of type B11BSappliances 84 6.9 Combustion . 86 6.9.1 Requirements 86 6.9.2 Test . 86 6.9.3 Nitrogen oxides emissions 91 6.10 Soot deposition .
27、93 6.10.1 Requirement 93 6.10.2 Test . 93 6.11 Frost protection system for appliances intended to be installed in a partially protected place . 93 6.12 Protection against ingress of rain . 93 6.13 Supplementary tests for condensing water heaters . 94 6.13.1 Formation of condensate . 94 6.13.2 Temper
28、ature of combustion products 94 6.14 Electrical power measurements 95 6.14.1 General . 95 6.14.2 Nominal and minimal conditions 95 6.14.3 Standby 95 6.15 Measurement of standby heat losses . 95 7 Rational use of energy . 95 7.1 General . 95 7.2 Heat input of ignition burners . 95 7.2.1 Requirement 9
29、5 7.2.2 Test . 95 7.3 Efficiency . 96 7.3.1 Requirement 96 7.3.2 Test . 96 8 Fitness for purpose 97 8.1 General . 97 8.2 Constructional characteristics 97 8.2.1 Water connections 97 8.2.2 Preset water rate adjuster 97 8.2.3 Temperature selector and summer-winter switch . 97 8.2.4 Designation and mea
30、surement of reference temperatures of flue systems 97 8.2.5 Mechanical resistance and stability of ducts, terminal and fitting pieces 98 8.3 Requirements for plastic in the combustion product evacuation ducts, terminals and fitting pieces for appliances 100 8.3.1 Thermal resistance . 100 8.3.2 Mater
31、ials 100 8.4 Requirements for elastomeric seals and elastomeric sealants in the combustion product evacuation ducts, terminals and fitting pieces 105 8.4.1 Characterization 105 8.4.2 Long-term resistance to thermal load 106 8.4.3 Long-term resistance to condensate exposure . 107 8.4.4 Cyclic condens
32、ate resistance test 108 8.4.5 Relaxation behaviour . 108 8.4.6 Compression set . 109 8.4.7 Low temperature resistance 109 8.4.8 Joints in elastomeric seals 109 8.5 Operational characteristics . 110 8.5.1 Minimum heat input 110 8.5.2 Nominal and minimum useful outputs . 110 8.5.3 Ignition of permanen
33、t ignition burners by a spark generator 110 8.5.4 Ignition opening time (TIA) . 110 8.5.5 Automatic water-operated gas valve 111 BS EN 26:2015EN 26:2015 (E) 5 8.5.6 Adjustment of the water rate - Water temperature . 112 8.5.7 Heating-up time . 116 8.5.8 Specific rate . 117 9 Marking and instructions
34、 129 9.1 Appliance marking 129 9.1.1 Data plate 129 9.1.2 Supplementary markings 130 9.1.3 Supplementary marking and instructions in the case of water heaters to be installed in partially protected places . 131 9.1.4 Packaging . 131 9.1.5 Warnings on the appliance and the packaging 131 9.1.6 Other i
35、nformation 132 9.2 Instructions 132 9.2.1 Installation instructions 132 9.2.2 Users instructions 137 9.2.3 Conversion instructions . 138 9.3 Presentation . 138 10 Ecodesign Data 138 10.1 Water heating energy efficiency (wh) . 138 10.2 Nitrogen oxides emissions . 138 10.3 Additional product informati
36、on 139 11 Energy Labelling Data . 139 11.1 General . 139 11.2 Printed label . 139 11.2.1 General . 139 11.2.2 Annual Electricity Consumption (AEC) . 139 11.2.3 Annual Fuel Consumption (AFC) . 139 11.2.4 Sound power level (LWA) . 139 11.3 Product fiche 140 11.4 Technical documentation . 140 Annex A (
37、informative) National situations 141 Annex B (normative) Test apparatus for type C1,C3,B4and B5water heaters (see 6.7.3.2) 144 Annex C (normative) Test apparatus for type C21appliances (see 6.7.4.2) 149 Annex D (normative) Description of the sealed room for the tests of type AASappliances (see 6.8.1
38、0.1.2.1) 150 Annex E (informative) Soundness of the gas circuit test - Volumetric method (see 6.1.6.5 and 6.2.1.3). 151 Annex F (informative) Principal symbols and abbreviations used 152 Annex G (informative) Guidelines for extension to other categories 153 Annex H (informative) A deviations . 154 A
39、nnex I (normative) Lists of materials currently used 155 Annex J (normative) Test methods to determine the effects of to long-term thermal load, long-term condensate exposure, condensing/ non-condensing cycling and resistance to UV radiation 157 Annex K (informative) NOx conversion calculation 158 A
40、nnex L (normative) Parts in copper or copper alloys . 159 Annex M (informative) Compilation of the test conditions for the various gas families . 160 BS EN 26:2015EN 26:2015 (E) 6 Annex N (informative) Alternative Method for the determination of the nominal heat input or the maximum and minimum heat
41、 input (according to 6.3.1) for appliances using a pneumatic gas/air ratio control system . 162 Annex ZA (informative) Relationship between this European Standard and the requirements of EU Directive 2009/142/EC . 163 Annex ZB (informative) Relationship between this European Standard and the require
42、ments of Commission Regulation (EU) No 814/2013 166 Annex ZC (informative) Relationship between this European Standard and the requirements of Commission Delegated Regulation (EU) No 812/2013 167 Bibliography . 168 BS EN 26:2015EN 26:2015 (E) 7 Foreword This document (EN 26:2015) has been prepared b
43、y Technical Committee CEN/TC 48 “Domestic gas-fired water heaters”, 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 November 2015 and conflicting nationa
44、l standards shall be withdrawn at the latest by November 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersede
45、s EN 26:1997. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, Annex ZB or Annex ZC, which are inte
46、gral parts of this document. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). This document deals with: safety; rational use of energy; fitness for purpose. It give
47、s specific requirements or disposals relative to: requirements and test methods for type C water heaters with a fan incorporated in the combustion air supply circuit or in the combustion products evacuation circuit; combustion products evacuation ducts which are part of a water heater; condensing wa
48、ter heaters; water heaters installed indoors and/or partially protected place; requirements and test procedures for resistance to freezing; NOx measurement; the metallic, plastic and other non-metallic materials that are used in water heaters and which come into contact with water intended for human
49、 consumption. It is intended to ensure that products of this kind complying with these requirements meet current technological development and requirements with regard to the service life of the water heaters and their physiological suitability. BS EN 26:2015EN 26:2015 (E) 8 According to the CEN-CENELEC Internal Regulations, the national standards organizations 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 Macedon
