1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58The European Standard EN 303-3:1998, with the incorporation of amendment A2:2004, has the status of
2、 a British StandardICS 91.140.10Heating boilers Part 3: Gas-fired central heating boilers Assembly comprising a boiler body and a forced draught burnerBRITISH STANDARDBS EN 303-3:1999Incorporating Amendment No. 1and Corrigendum No. 1BS EN 303-3:1999This British Standard, having been prepared under t
3、he direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on15 March 1999 BSI 2006ISBN 0 580 30929 0A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British
4、 Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online
5、.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside f
6、ront cover, the EN title page, pages 2 to 37 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date Comments15305 3 September 2004 See national foreword16503 Corrigendum No. 131 July 2006 Chang
7、es to Tables 5 and 6 aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.N
8、ational forewordThis British Standard is the official English language version of EN 303-3:1998, including amendment A2:2004 and corrigendum June 2006.The start and finish of text introduced or altered by amendment is indicated in the text by tags !“. Tags indicating changes to CEN text carry the nu
9、mber of the CEN amendment. For example, text altered by CEN amendment 1 is indicated by !“.The UK participation in its preparation was entrusted to Technical Committee GSE/41, Non-domestic gas-fired central heating boilers, which has the responsibility to: EUROPISCHE NORMICS 91.140.10 m June 2006Des
10、criptors: he ent specifications, pePartcomprising a boiler body and a forced draught burnerChaudires de chaufPartie 3: Chauutilisant les combuAssemblage dun corps de chbrleur air (inclut lamendemge el und ardiisatiEuropisches Komitee fr NormungCentral Secretariat: rue de Stassart 3 1998 CEN All righ
11、ts of exploitation in any form and by any meaMembers.6, B-1050 Brusselsns reserved worldwide for CEN national Ref. No. EN 303-3:1998 + A2:2004 EEuropean Committee for StandComit Europen de NormalzationonGerman). A version in any other language made by translation under the responsibility of a CEN me
12、mber into its own language and notified to the Central Secretariat has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lit
13、huania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.CENamendment A2 was approved by CEN on 3 November 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for givi
14、ng 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 Central Secretariat or to any CEN member.This European Standard exists in three official versio
15、ns (English, French, English versionHeating boilers 3: Gas-fired central heating boilers Assembly (includes amendment A2:2004)fage dires de chauffage central stibles gazeux audire et dun soufflent A2:2004)Heizkessel Teil 3: Zentralheizkessel fr gasfrmiBrennstoffe Zusammenbau aus KessGeblsebrenner(en
16、thlt nderung A2:2004)This European Standard was approved by CEN on 22 August 1997; September 1998+A2April 2004Incorporating Corrigenduaters, gas appliances, boilers, central heating, heating units, burners, definitions, classifications, equipmrformance evaluation, tests, name plates, technical notic
17、es, markingEUROPEAN STANDARDNORME EUROPENNEEN 303-3EN 303-3:1998Foreword This European Standard has been prepared by Technical Committee CEN/TC 109, Central heating boilers using gaseous fuels, the Secretariat of which is held by NNI. This European Standard shall be given the status of a national st
18、andard, either by publication of an identical text or by endorsement, at the latest by March 1999, and conflicting national standards shall be withdrawn at the latest by March 1999. This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free
19、 Trade Association, and supports essential requirements of EU Directive(s). This European Standard specifies the tests to be carried out on the assembly of a boiler body in conformity with standard EN 303-1 and a forced draught burner in conformity with standard EN 676. The European Standard EN 303
20、includes six parts: Part 1: Heating boilers with forced draught burners Terminology, general requirements, testing and marking. Part 2: Heating boilers with forced draught burners Special requirements for boilers with atomizing oil burners. This Part 3. Part 4: Heating boilers with forced draught bu
21、rners With outputs up to 70 kW and a maximum operating pressure of 3 bar Terminology, special requirements, testing and marking. Part 5: Special heating boilers for solid fuels Hand and automatically fired Nominal heat output of up to 300kW Terminology, requirements, testing and marking. Part 6: Hea
22、ting boilers with forced draught burners Specific requirements for the domestic hot water operation of liquid-fired combination boilers of nominal heat output not exceeding 70 kW. This European Standard does not deal with NOxemissions, as they are treated in EN 676. For relationship with EU Directiv
23、e(s), see informative Annex ZA, which is an integral part of this standard. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement Foreword to amendment A2This document EN 303-3:1998/A2:2004 has been prepared by Techn
24、ical Committee CEN/TC 109, Central heating boilers using gaseous fuels, the Secretariat of which is held by NEN.This amendment to the European Standard EN 303-3:1998 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by Octob
25、er 2004, and conflicting national standards shall be withdrawn at the latest by October 2004.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).WARNING: other requirem
26、ents and other EU Directives may be applicable to the products falling within the scope of this European Standard.For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.According to the CEN/CENELEC Internal Regulations, the national standards orga
27、nizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kin
28、gdom. NOTE Once constructional requirements for low-temperature boilers have been included within EN 303-1 they will replace the constructional requirements of this amendment.Amendment A1 to European Standard EN 303-3 does not exist. The draft worked out under the reference EN 303-3:1998/prA1 is now
29、 referenced prEN 303-7. BSI 20062this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. EN 303-3:1998ContentsPageForeword 21Scope 52 No
30、rmative references 53 Definitions 64 Assembly requirements 75 Operational requirements 86 Test methods 107 Instructions 21Annex A (informative) Diameters of combustion products evacuation ducts marketed in the various countries (see 4.3) 30Annex B (informative) Practical method of calibrating the te
31、st rig to enable determination of heat loss Dp(see 6.4.1) 30Annex C (informative) Determination of the heat losses from the test rig of the indirect method and the contributions of the circulating pump of the test rig (see 6.4.2.3.1.3) 31Annex D (informative) Determination of the ignition time at fu
32、ll rate (see Table 6) 31Annex E (normative) Assembly criteria (see 4.1) 32Annex F (informative) Ranges of boilers 33Annex G (normative) Case of a boiler body which has already been tested with a liquid fuel burner in accordance with EN 303-1, EN 303-2 and EN 304 (see Foreword and Clause 1) 34#Annex
33、deleted$Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other provisions of EU Directives 35 BSI 200634blankEN 303-3:19981 Scope This European Standard specifies the requirements and test methods for the construction, the safety and the rational energy u
34、sage of an assembly made up of a boiler body complying with EN 303-11)and a forced draught gas burner complying with EN 676, using combustible gases, hereafter referred to as a “boiler”. #This European Standard applies to standard boilers and low-temperature boilers with a nominal heat output not ex
35、ceeding 1 000 kW and with a water temperature at normal operation not exceeding 105 C.$ This European Standard does not contain all the necessary requirements for: assemblies designed as units; #condensing boilers$; boilers intended to be installed in the open; boilers permanently fitted with more t
36、han one flue outlet; boilers fitted with a draught diverter; boilers intended to be connected to a common flue having mechanical extraction. This European Standard does not apply to living-space dedicated boilers (see 3.6). If the boiler body has already been tested with a liquid fuel burner, in acc
37、ordance with EN 303-1, EN 303-2 and EN 304, only the tests described in Annex G need to be performed. In the case of a range of boilers, see Annex F. #Text deleted$This European Standard only covers type testing. 2 Normative references This present European Standard incorporates by means of dated or
38、 undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments or revisions of any of these publications apply to this European Standard only whe
39、n incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. EN 303-1, Heating boilers Heating boilers with forced draught burners Part 1: Terminology, general requirements, testing and marking.EN 303-2, Heating boilers Heating boi
40、lers with forced draught burners Part 2: Special requirements for boilers with atomizing oil burners.EN 304, Heating boilers Test code for heating boilers for atomizing oil burners.EN 676, Automatic forced draught burners for gaseous fuels. BSI 200651)The conformity with the standard EN 303-1 can be
41、 obtained jointly by the EN 303-1 specific tests and the EN 303-2 or EN 303-3 tests. If the boiler body has already been tested for conformity with EN 303-2, see Annex G.EN 303-3:19983 Definitions For the purposes of this standard, the following definitions apply. 3.1 gas rates3.1.1 volumetric rate
42、the volume of gas consumed by the boiler in unit time during continuous operation, expressed in cubic metres per hour (m3/h)symbols: V (under test conditions); Vr(under reference conditions) 3.1.2 mass ratethe mass of gas consumed by the boiler in unit time during continuous operation, expressed in
43、kilograms per hour (kg/h), or on occasions in grams per hour (g/h) symbols: M (under test conditions); Mr(under reference conditions) 3.2 heat input the product of the volumetric rate or the mass rate, and the net calorific value of the gas, under the same reference conditions, expressed in kilowatt
44、s (kW) symbol: Q 3.2.1 nominal heat input2)the heat input stated by the manufacturer, expressed in kilowatts (kW) symbol: Qn 3.3 outputs 3.3.1 useful output the quantity of heat transmitted to the heat carrier in unit time, expressed in kilowatts (kW) symbol: P 3.3.2 nominal output the useful output
45、 stated by the manufacturer, expressed in kilowatts (kW) symbol: Pn 3.4 useful efficiency the ratio of the useful output to the heat input, expressed in percent (%) symbol: u 3.5 nominal voltage the voltage or range of voltages stated by the manufacturer, at which the boiler can operate normally 6 B
46、SI 20062)Boilers fitted with a range-rating device operate at a nominal heat input between the maximum and minimum adjustable heat inputs. Modulating boilers operate between the nominal heat input and the minimum controlled heat input. The maximum heat input corresponds to the nominal output of the
47、boiler in accordance with EN 303-1.EN 303-3:19983.6 boiler to be installed in the living space a boiler with an effective rated output of less than 37 kW, designed to provide heat to the part of the living space in which it is installed by means of the emission of heat from the casing having an open
48、 expansion chamber, supplying hot water using gravity circulation 3.7 unit assembly comprising a boiler body and a forced draught burner, designed and marketed as a complete boiler #3.8 condensateliquid formed from the combustion products during the condensation process3.9 standard boilerboiler for
49、which the average water temperature can be restricted by design3.10 low-temperature boilerboiler which can work continuously with a water supply temperature of 35 C to 40 C, possibly producing condensation in certain circumstances$4 Assembly requirements 4.1 General principles The boiler body shall be in accordance with EN 303-13). The forced draught gas burner shall be in accordance with EN 676. NOTE This European Standard also allows the results obta
