1、BRITISH STANDARDBS EN 303-7:2006Heating boilers Part 7: Gas-fired central heating boilers equipped with a forced draught burner of nominal heat output not exceeding 1 000 kWThe European Standard EN 303-7:2006 has the status of a British StandardICS 91.140.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g4
2、3g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 303-7:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2007 BSI
3、2007ISBN 0 580 49826 3National forewordThis British Standard was published by BSI. It is the UK implementation of EN 303-7:2006. The UK participation in its preparation was entrusted to Technical Committee GSE/29, Gas-fired central heating boilers (domestic and non-domestic) and domestic gas-fired w
4、ater heaters.A list of organizations represented on GSE/29 can be obtained on request to its secretary.EN 303-7:2006 is a candidate “harmonized” European standard and fully takes into account the requirements, given under the EU gas appliances (90/396/EEC) and boiler efficiency (92/42/EEC) Directive
5、s, and intended to lead to CE marking. The date of applicability of EN 303-7:2006 as a harmonized European standard, i.e. the date after which this standard may be used for CE marking purposes, is subject to an announcement in the Official Journal of the European Communities. The Commission in consu
6、ltation with Member States has agreed a transition period for the co-existence of harmonized European standards and their corresponding national standard(s). It is intended that this period will comprise a period, usually nine months, after the date of availability of the European Standard, during w
7、hich any required changes to national regulations are to be made, followed by a further period, usually of 12 months, for the implementation of CE marking. At the end of this co-existence period, the national standard(s) will be withdrawn. In the UK, there are no corresponding national standards. Th
8、e UK as a member of CEN is obliged to publish EN 303-7:2006 as a British Standard. However, attention is drawn to the fact that during the development of this European standard, the UK consistently voted against its approval as a European standard. The reason for this disapproval and additional info
9、rmation is given in National Annex NA.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 cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No
10、. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 303-7October 2006ICS 91.140.10English VersionHeating boilers - Part 7: Gas-fired central heating boilersequipped with a forced draught burner of nominal heat outputnot exceeding 1 000 kWChaudire de chauffage - Partie 7 : Chaudires dech
11、auffage central quipes dun brleur air soufflutilisant les combustibles gazeux de puissance utileinfrieure ou gale 1 000 kWHeizkessel - Teil 7 : Zentralheizkessel fr gasfrmigeBrennstoffe mit einer Geblsebrenner mit einerNennwrmeleistung kleiner als oder gleich 1 000 kWThis European Standard was appro
12、ved by CEN on 14 December 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationals
13、tandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified t
14、o the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Nor
15、way, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form an
16、d by any means reservedworldwide for CEN national Members.Ref. No. EN 303-7:2006: EEN 303-7:2006 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .5 4 Constructional and operational requirements9 4.1 General principles9 4.2 Operational requirements .9 5 Test m
17、ethods18 5.1 General principles18 5.2 External tightness of the gas line 21 5.3 Heat input rates21 5.4 Gas pressure governor .22 5.5 Safety of operation 22 5.6 Control and safety equipments25 5.7 Combustion26 5.8 Useful efficiencies .27 5.9 Condensation.34 6 Marking and instructions 34 6.1 Marking .
18、34 6.2 Instructions 36 6.3 Presentation .38 Annex A (informative) Diameters of combustion products evacuation ducts marketed in the various countries.49 Annex B (informative) Practical method of calibrating the test rig to enable determination of heat loss Dp.50 Annex C (informative) Determination o
19、f the heat losses from the test rig of the indirect method and the contributions of the circulating pump of the test rig (see 5.8.2.3.1.3) .51 Annex D (informative) Determination of the operating time at full rate prior to modulation.52 Annex E (normative) Determination of the combustion characteris
20、tics Carbon monoxide and nitrogen oxides 53 Annex F (normative) Case of a forced draught burner complying with EN 67655 Annex G (informative) Main symbols and abbreviations used.56 Annex H (informative) A-deviations.57 Annex ZA (informative) Clauses of this European Standard addressing essential req
21、uirements or other provisions of EU Directives58 Bibliography 61 National Annex NA (informative) Additional information for UK users 62EN 303-7:2006 (E) 3 Foreword This document (EN 303-7:2006) has been prepared by Technical Committee CEN/TC 109 “Central heating boilers using gaseous fuels”, the sec
22、retariat of which is held by NEN. 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 April 2007, and conflicting national standards shall be withdrawn at the latest by April 2007. This document has b
23、een 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, which is an integral part of this document. WARNING Other requirement
24、s and other EU Directives may be applicable to the products falling within the scope of this European Standard. NOTE When constructional requirements for low temperature boilers will have been introduced in EN 303-1, they will replace those of this European Standard by amendment. Annexes A, B, C, D,
25、 G and ZA are informative. Annexes E and F are normative. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Ger
26、many, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 303-7:2006 (E) 4 1 Scope This European Standard specifies the requirements and test methods for
27、the construction, the safety and the rational energy usage for gas-fired standard and low temperature central heating boilers equipped with a forced draught burner. These boilers comprise a boiler body and a forced draught gas burner brought together at the producers assembly facility, the whole bei
28、ng designed and marketed as a complete boiler. This standard does not apply to the case of the assembly of a boiler body and a forced draught gas burner designed and marketed separately. In this case, EN 303-3 applies. This European Standard applies to type B23boilers with a nominal heat output not
29、exceeding 1000 kW with a water temperature at normal operation not exceeding 105 C and with a maximum water-side operating pressure not exceeding 8 bar. This European Standard does not contain all the necessary requirements for: condensing boilers and combination boilers; boilers intended to be inst
30、alled in the open; boilers permanently fitted with more than one flue outlet; boilers intended to be connected to a common flue having mechanical extraction; boilers equipped with several combustion chambers. This European Standard does not apply to living-space dedicated boilers (see 3.6). This Eur
31、opean Standard only covers type testing. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendm
32、ents) applies. EN 303-1:1999, Heating boilers Part 1: Heating boilers with forced draught burners Terminology, general requirements, testing and marking EN 437, Test gases Test pressures Appliance categories EN 676, Automatic forced draught burners for gaseous fuels EN 60335-1:2002, Household and si
33、milar electrical appliances - Safety Part 1: General requirements (IEC 60335-1:2001, modified) EN ISO 3166-1, Codes for the representation of name of countries and their subdivisions Part 1: Country codes (ISO 3166-1:1997) CEN/TR 1749, European scheme for the classification of gas appliances accordi
34、ng to the method of evacuation of the combustion products (types) EN 303-7:2006 (E) 5 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 Gas rates 3.1.1 volumetric rate V (under test conditions); Vr (under reference conditions) volume o
35、f gas consumed by the boiler in unit time during continuous operation NOTE Volumetric rate is expressed in cubic metres per hour (m3/h). 3.1.2 mass rate M (under test conditions); Mr(under reference conditions) mass of gas consumed by the boiler in unit time during continuous operation NOTE Mass rat
36、e is expressed in kilograms per hour (kg/h), or on occasions in grams per hour (g/h). 3.2 heat input Q product of the volumetric rate or the mass rate, and the net calorific value of the gas, under the same reference conditions NOTE Heat inputs are expressed in kilowatts (kW). 3.2.1 nominal heat inp
37、ut1)Qnheat input stated by the manufacturer 3.3 Outputs 3.3.1 useful output P quantity of heat transmitted to the heat carrier in unit time NOTE Outputs are expressed in kilowatts (kW) 3.3.2 nominal output Pnuseful output stated by the manufacturer 3.4 useful efficiency uratio of the useful output t
38、o the heat input NOTE the useful efficiency is expressed in percent (%). 3.5 nominal voltage voltage or range of voltages stated by the manufacturer, at which the boiler can operate normally 1)Boilers fitted with a range-rating device operate at a nominal heat input between the maximum and minimum a
39、djustable 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 boiler in accordance with EN 303-1. EN 303-7:2006 (E) 6 3.6 boiler to be installed in the living space boiler with a
40、n 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 expansion chamber, supplying hot water using gravity circulation 3.7 boiler appliance comprising a boiler bod
41、y and a forced draught burner, designed and brought together at the producers assembly facility and marketed as a complete boiler 3.8 gases and categories gases are classified into families, groups and ranges in accordance with EN 437 Boilers are classified into categories in accordance with EN 437.
42、 3.9 Classification in accordance with the mode of evacuation of the combustion products (CEN/TR 1749) 3.9.1 type B appliance intended to be connected to a flue that evacuates the products of combustion to the outside of the room containing the appliance. The combustion air is drawn directly from th
43、e room 3.9.2 type B2type B appliance without draught diverter 3.9.3 type B23type B2appliance incorporating a fan upstream of the combustion chamber/heat exchanger 3.10 forced draught burner burner in which the combustion air is introduced by means of a fan 3.11 automatic forced draught burner forced
44、 draught burner that is fitted with automatic ignition, flame monitoring and burner control devices. Ignition, flame monitoring and the on/off switching of the burner occur automatically. The heat input of the burner can be adjusted during operation either automatically or manually 3.12 total pre-mi
45、xed burner burner in which at least all the air theoretically required for complete combustion of the gas is mixed with the gas upstream of the mixture outlet ports 3.13 nozzle mixed burner burner in which part, or all, of the air theoretically required for combustion of the gas is mixed with the ga
46、s at, or downstream of, the air and gas ports 3.14 start gas rate gas rate ignited by the ignition device during the start-up of the burner EN 303-7:2006 (E) 7 3.15 combustion chamber part of the boiler in which the combustion of the mixture of the gas and air takes place 3.16 gas line part of the b
47、urner which is made up of the valves and controls and safety devices in which gas is conveyed between the inlet connection and the burner head 3.17 range-rating device component on the burner intended to be used for adjusting the heat input, within a range of heat inputs stated by the manufacturer,
48、to suit the actual heat requirements of the installation This adjustment may be progressive or in discrete steps. 3.18 automatic shut-off valve device that automatically opens, closes or varies the gas rate on a signal from the control circuit and/or the safety circuit 3.19 ignition device any means
49、 (flame, electrical ignition or other means) used to ignite the gas at the ignition burner or at the main burner 3.20 purge forced introduction of air into the combustion chamber and flue passages, in order to displace any remaining gas/air mixture and/or products of combustion 3.21 flame stability capacity of flame to remain on the burner head or in the flame reception zone intended by the design 3.22 flame lift total or partial lifting of the base of the flame away from the burner head or the flame holding zone provided by the design 3.2
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