1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 15420:2010Gas-fired central heating boilers Type C boilers of nominal heat input exceeding 70 kW, but not exceeding 1 000 kWCopyright European Committee for Standardization
2、 Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 15420:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 15420:2010.The UK participation in its preparation was entrusted to Technic
3、alCommittee GSE/29, Gas-fired central heating boilers (domestic andnon-domestic) and domestic gas-fired water heaters.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contrac
4、t. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 56382 9ICS 91.140.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2010.Am
5、endments issued since publicationDate Text affectedCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 15420:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15420 Dece
6、mber 2010 ICS 91.140.10 English Version Gas-fired central heating boilers - Type C boilers of nominal heat input exceeding 70 kW, but not exceeding 1 000 kW Chaudires de chauffage central utilisant les combustibles gazeux - Chaudires de type C dont le dbit calorifique nominal est suprieur 70 kW mais
7、 infrieur ou gal 1 000 kW Heizkessel fr gasfrmige Brennstoffe - Heizkessel der Bauart C mit einer Nennwrmebelastung grer als 70 kW aber gleich oder kleiner als 1 000 kW This European Standard was approved by CEN on 23 October 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regula
8、tions 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 Management Centre or to any CEN member. This E
9、uropean 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 Management Centre has the same status as the official versions. CEN members are the
10、 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, Romania, Slovakia, Slovenia, Spain, Sweden, Sw
11、itzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. N
12、o. EN 15420:2010: ECopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 15420:2010 EN 15420:2010 (E) 2 Contents Page Foreword . 71 Scope 82 Normative references . 83 Terms and d
13、efinitions . 103.1 Combustible gases . 103.2 Constituent parts of the boiler . 123.2.1 Gas supply . 123.2.2 Air supply and combustion products evacuation . 133.2.3 Adjusting, control and safety devices 153.3 Operation of the boiler 173.3.1 Gas rates 173.3.2 Outputs. 183.3.3 Efficiency . 183.3.4 Gas
14、combustion 193.3.5 Times 193.3.6 spark restoration . 203.3.7 recycling 203.3.8 controlled shutdown . 203.3.9 safety shutdown 203.3.10 Locking out 203.4 Auxiliary energy 213.4.1 electric auxiliary energy . 213.5 Country of destination 213.5.1 direct country of destination . 213.5.2 indirect country o
15、f destination 214 Classification of boilers 214.1 Gases and categories . 214.2 Mode of air supply and evacuation of the combustion products 224.2.1 Type C Boilers . 224.2.2 Type of installation of the boiler 224.2.3 Presence and position of a fan 234.3 Classification according to operating condition
16、s)234.3.1 Standard boiler 234.3.2 Low-temperature boiler 234.3.3 Gas condensing boiler). 244.4 Modular boiler . 245 Constructional requirements . 245.1 General . 245.2 Conversion to different gases . 245.3 Materials and method of construction 245.3.1 General . 245.3.2 Materials and thicknesses of wa
17、lls or tubes under water pressure 255.3.3 Thermal insulation 335.4 Combustion products evacuation duct 345.4.1 Stability under mechanical loading . 345.4.2 Stability under exposure to heat . 345.4.3 Corrosion resistance 345.4.4 Resistance to condensate and moisture under normal operating conditions
18、. 345.5 Design 34Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 15420:2010EN 15420:2010 (E) 3 5.5.1 General . 345.5.2 Modular boilers . 355.6 Use and servicing . 355.7 Con
19、nections to the gas and water pipes 355.7.1 General . 355.7.2 Connections to the gas pipe 355.7.3 Connections to the central heating circuit . 365.8 Soundness . 365.8.1 Soundness of the gas circuit . 365.8.2 Soundness of the combustion circuit . 365.9 Supply of combustion air and the evacuation of t
20、he combustion products 375.9.1 General . 375.9.2 Air supply and combustion products evacuation duct)375.9.3 Terminal . 375.9.4 Terminal guard 375.9.5 Fitting piece . 385.9.6 Control dampers in the air or combustion products circuit . 385.9.7 Special requirements for certain components of boilers wit
21、h a fan . 385.9.8 Condensate discharge 395.10 Checking the state of operation 405.11 Drainage . 405.12 Electrical equipment . 405.13 Operational safety in the event of failure of the auxiliary energy 405.14 Adjusting, control and safety devices 405.14.1 General . 405.14.2 Adjusters and range rating
22、devices 415.14.3 Gas circuit 415.14.4 Gas pressure regulator. 435.14.5 Ignition devices . 435.14.6 Flame supervision systems . 445.14.7 Thermostats and water temperature limiting devices . 455.15 Burners 465.16 Pressure test points 465.17 Chemical composition of the condensate 466 Operational requir
23、ements 466.1 General . 466.2 Soundness . 466.2.1 Soundness of the gas circuit . 466.2.2 Soundness of the combustion circuit . 476.2.3 Soundness of the water circuit 486.3 Nominal, maximum and minimum heat inputs, and nominal output . 486.3.1 Nominal heat input or maximum and minimum heat inputs 486.
24、3.2 Adjustment of the heat input by the downstream pressure . 486.3.3 Ignition rate 486.3.4 Nominal output 486.3.5 Gas pressure regulator. 486.4 Safety of operation 496.4.1 Limiting temperatures 496.4.2 lgnition Cross-lighting Flame stability 506.4.3 Pre-purge . 516.4.4 Functioning of a permanent ig
25、nition burner when the fan stops during the standby time 526.5 Adjusting, control and safety devices 526.5.1 General . 526.5.2 Ignition devices . 526.5.3 Flame supervision devices 536.5.4 Ignition burner and ignition rates 556.5.5 Air proving . 55Copyright European Committee for Standardization Prov
26、ided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4 6.5.6 Gas pressure switches . 566.5.7 Control thermostat and safety temperature limiter . 576.5.8 Condensate discharge blockage . 586.6 Combustion . 586.6.1 Carbon monoxide 586.6.2
27、Limit conditions 586.6.3 Special conditions 586.6.4 Sooting . 586.6.5 Other pollutants 586.7 Useful efficiencies . 596.7.1 Useful efficiency at the nominal heat input 596.7.2 Useful efficiency at part load . 596.8 Criteria for condensation in the flue . 606.9 Resistance of the materials to pressure
28、. 606.9.1 General . 606.9.2 Boilers of sheet steel or non-ferrous metals . 606.9.3 Boilers of cast iron and cast materials . 606.10 Hydraulic resistance . 616.11 Condensation in the boiler . 616.12 Combustion air and flue dampers . 617 Test methods . 617.1 General . 617.1.1 Characteristics of the re
29、ference and limit gases . 617.1.2 General test conditions 677.2 Soundness . 707.2.1 Soundness of the gas circuit . 707.2.2 Soundness of the combustion circuit . 717.2.3 Soundness of the water circuit 727.3 Nominal, maximum and minimum heat inputs, and nominal output . 727.3.1 Nominal heat input or m
30、aximum and minimum heat inputs 727.3.2 Adjustment of the heat input by the downstream pressure . 737.3.3 Ignition rate 747.3.4 Nominal output 747.3.5 Gas pressure regulator. 747.4 Safety of operation 747.4.1 Limiting temperatures 747.4.2 Ignition - Cross-lighting - Flame stability . 767.4.3 Pre-purg
31、e . 797.4.4 Functioning of a permanent ignition burner when the fan stops during standby time . 807.5 Adjusting, control and safety devices 807.5.1 General . 807.5.2 Ignition devices . 807.5.3 Flame supervision devices 817.5.4 Ignition burner and ignition rates 837.5.5 Air proving . 837.5.6 Gas pres
32、sure switches . 857.5.7 Control thermostat and safety temperature limiter . 857.5.8 Condensate discharge blockage . 877.6 Combustion . 877.6.1 Carbon monoxide 877.6.2 Limit conditions 887.6.3 Special conditions 897.6.4 Other pollutants 917.7 Useful efficiencies . 957.7.1 Useful efficiency at the nom
33、inal heat input 957.7.2 Useful efficiency at part load . 967.8 Criteria for condensation in the flue . 101BS EN 15420:2010 EN 15420:2010 (E) Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license fr
34、om IHS-,-,-5 7.8.1 Determination of flue losses 1017.8.2 Minimum temperature of the combustion products 1027.9 Resistance of materials to pressure . 1027.9.1 General . 1027.9.2 Boilers of sheet steel or non-ferrous metals . 1027.9.3 Boilers of cast iron and cast materials . 1037.10 Hydraulic resista
35、nce . 1037.11 Condensation in the boiler . 1037.12 Combustion air and flue dampers . 1038 Marking and instructions . 1048.1 Marking of the boiler . 1048.1.1 General . 1048.1.2 Data plate . 1048.1.3 Supplementary marking . 1068.1.4 Packaging 1088.1.5 Warnings on the boiler and on the packaging . 1088
36、.1.6 Other information 1088.2 Instructions 1088.2.1 Technical instructions for the installer . 1088.2.2 For installation of the combustion circuit 1098.2.3 Use and maintenance instructions for the user 1108.2.4 Conversion instructions . 1118.3 Presentation 111Annex A (informative) National situation
37、s . 127A.1 Categories marketed in the various countries . 127A.2 Special categories marketed nationally or locally . 129A.3 Gas groups distributed locally 129A.4 Boiler supply pressures . 130A.5 Gas connections in common use in the various countries 132Annex B (informative) Special national conditio
38、ns . 133Annex C (informative) A-deviations 134Annex D (informative) Classification of type C boilers . 135Annex E (informative) Practical method of calibrating the test rig to enable the heat loss Dpto be determined 142Annex F (informative) Main symbols and abbreviations used . 143Annex G (informati
39、ve) Compilation of test conditions . 144Annex H (informative) Valving . 147H.1 General . 147H.2 Boilers with permanent ignition burner or alternating ignition burner or leakage control device or with pre-purge . 147H.2.1 Heat inputs up to 150 kW . 147H.2.2 Heat inputs up to 300 kW . 148H.3 Boilers w
40、ithout permanent ignition burner or alternating ignition burner, without leakage control device and without pre-purge 149H.3.1 Heat inputs up to 150 kW . 149H.3.2 Heat inputs up to 300 kW . 150H.4 Heat Inputs exceeding 300 kW but not exceeding 1 000 kW 151H.4.1 Boilers with permanent ignition burner
41、 or alternating ignition burner or leakage control device or with pre-purge . 151H.4.2 Boilers without permanent ignition burner or alternating ignition burner, without a leakage control device and without pre-purge 152Annex I (informative) Determination of the heat losses from the test rig of the i
42、ndirect method and the contributions of the circulating pump of the test rig 153BS EN 15420:2010EN 15420:2010 (E) Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-6 Annex J (infor
43、mative) Means of determining the ignition time at full rate . 154Annex K (informative) Example of the calculation of the NOx weighting factors for a boiler with several rates 155K.1 Apportioning of Qpi = 20 % . 155K.2 Apportioning of Qpi = 40 % . 155K.3 Apportioning of Qpi = 60 % . 155K.4 Apportioni
44、ng of Qpi = 70 % . 156K.5 Total apportioning . 156Annex L (informative) Calculation of conversions of NOx . 157Annex M (normative) Test apparatus for type C2 boilers (see 7.4.2.3.3) 158Annex N (informative) Requirements and test methods for separate air supply and combustion products evacuation duct
45、s of type C6 boilers) . 159N.1 Requirements 159N.1.1 Pressure losses . 159N.1.2 Pressure loss under the influence of wind 159N.1.3 Suction under the influence of wind . 159N.1.4 Recirculation of the combustion products. 159N.2 Test methods . 160N.2.1 Pressure loss in still air 160N.2.2 Pressure loss
46、 under the influence of wind 160N.2.3 Suction under the influence of wind . 160N.2.4 Recirculation of the combustion products. 161N.2.5 Wind test conditions . 161Annex O (informative) Use of test gases 164O.1 Boilers within a range . 164O.2 Guidance on the use of test gases 164Annex ZA (informative)
47、 Clauses of this European Standard addressing essential requirements or provisions of EU Directives . 165Bibliography . 168BS EN 15420:2010 EN 15420:2010 (E) Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-7 Foreword This document (EN 15420:2010) has been prepared by Technical Committee CEN/TC 109 “Central heating boilers using gaseous fuels
