1、BSI Standards PublicationSpecification for selection, installation, inspection, commissioning, servicing and maintenance of gasfired boilers of rated input not exceeding 70 kW netBS 6798:2014BS 6798:2014 BRITISH STANDARDPublishing and copyright informationThe BSI copyright notice displayed in this d
2、ocument indicates when the document was last issued. The British Standards Institution 2014. Published by BSI Standards Limited 2014ISBN 978 0 580 78704 1ICS 91.140.10The following BSI references relate to the work on this document: Committee reference GSE/30 Draft for comment 13/30261683 DCPublicat
3、ion historyFirst published, as CP 332.303 and subsequently renumbered CP 332-2, June 1951Second edition August 1964Third edition, as BS 5376-2, July 1976Fourth edition, as BS 6798, April 1987Fifth edition August 2000Sixth edition January 2009Seventh (current) edition May 2014Amendments issued since
4、publicationDate Text affected The British Standards Institution 2014 iBS 6798:2014BRITISH STANDARDContentsForeword iii1 Scope 12 Normative references 23 Terms and definitions 34 Competence 55 Environmental considerations 66 Selection of equipment and pre-installation 76.1 Exchange of information and
5、 planning 76.2 Selection of boiler 86.2.1 General 86.2.2 Boilers for sealed systems 96.3 Condensing boilers 106.3.1 General 106.3.2 Location 106.3.3 Siting of the chimney outlet 116.3.4 Selection of condensate discharge point 126.3.5 Combined discharge from pressure relief valve and boiler condensat
6、e drain 126.3.6 Use of condensate pump 136.3.7 Choice of discharge pipe 136.3.8 Positioning and termination of the condensate drainage pipe 166.3.9 In-line condensate neutralizer devices 176.4 Materials and components 186.5 Boiler rating 197 Installation 197.1 Air supply for combustion and ventilati
7、on 197.2 Chimney system 197.3 Siting of the appliance 207.3.1 General 207.3.2 Boiler compartment installations 207.3.3 Airing cupboard installations 217.3.4 Understairs cupboard installations 227.3.5 Bathroom and shower room installations 237.3.6 Bedroom and bed-sitting room installations 237.3.7 To
8、ilet and cloakroom installations 237.3.8 Roof space installation 237.3.9 External installation 247.3.10 Other installations 257.3.11 Ambient conditions 257.4 Protection 257.4.1 Open systems 257.4.2 Sealed systems 257.4.3 Pressure relief valve 267.4.4 Freezing 277.5 Gas supplies and pipework 277.5.1
9、First and second family gases 277.5.2 Third family gases 287.6 Electricity supplies and wiring 28Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 48, an inside back cover and a back cover.BS 6798:2014ii The British Standards Institution 2014BRIT
10、ISH STANDARD7.7 Water supplies and pipework 297.7.1 General 297.7.2 Open systems 307.7.3 Sealed systems 307.7.4 Waterways 317.8 Selection of heating system controls 318 Post-installation 328.1 Inspection 328.2 Commissioning 328.2.1 Final filling of the system 328.2.2 Boiler 338.3 Advice to user of t
11、he appliance 348.3.1 User instructions 348.3.2 Precautions 358.3.3 Maintenance 358.4 Service and maintenance 36AnnexesAnnex A (normative) Connection options for condensate and combined pressure relief valve/condensate discharge 37Bibliography 46List of figuresFigure 1 Open-flued boiler chimney clear
12、ances 22Figure A.1 Connection of condensate drainage pipe to internal soil and vent stack 38Figure A.2a) Connection of a condensate drainage pipe downstream of a sink, basin, bath or shower waste trap 40Figure A.2b) Connection of a condensate drainage pipe upstream of a sink, basin, bath or shower w
13、aste trap 41Figure A.3 Connection of condensate drainage pipe to external soil and vent stack 42Figure A.4 External drain, gully or rainwater hopper 43Figure A.5 External termination to rainwater downpipe 44Figure A.6 Example of a purpose made soakaway 45List of tablesTable 1 Approval bodies and sta
14、tutory regulations by country/territory 6Table 2 Competence requirements by country/territory 6 The British Standards Institution 2014 iiiBS 6798:2014BRITISH STANDARDForewordPublishing informationThis British Standard is published by BSI Standards Limited, under licence from The British Standards In
15、stitution, and came into effect on 31 May 2014. It was prepared by Panel GSE/30/-/5, Boilers of rated input not exceeding 70kW and hot water supply, under the authority of Technical Committee GSE/30, Gas installations (1st, 2nd and 3rd family gases). A list of organizations represented on this commi
16、ttee can be obtained on request to its secretary.SupersessionThis British Standard supersedes BS 6798:2009, which is withdrawn.Information about this documentThe structure of this document follows the approach used in other gas installation standards.Requirements, with corresponding commentary (e.g.
17、 explanation/recommendation as appropriate), cover equipment selection and pre-installation, installation and post-installation, to which maintenance has been added as a specific detail.In line with BS 5440-1, this revision acknowledges that European work on chimney standards has brought about the n
18、eed in British Standards to redefine chimney concepts and adopt common terminology consistent with the range of products used across the whole European Community (the general requirements for which are specified in BS EN 1443) where a chimney is treated as a structure containing a flue (the passagew
19、ay) and might include a liner (inner wall), insulation and an outer wall. The common terminology in UK industry, which has regarded a chimney as a masonry structure generally associated with solid fuel appliances, has been superseded.All websites referred to in this British Standard were last viewed
20、 on 28 May 2014.Use of this documentThe requirements of this specification are supported by recommendations in the form of Commentary. To comply with this specification, it is necessary to comply with all its provisions. The operative may depart from recommendations, but would be expected to have go
21、od reasons for doing so.This standard recognizes that manufacturers instructions (assessed at the time of CE type testing as resulting in at least an equivalent level of safety) might specify a method of installation, testing, commissioning, servicing or maintenance which differs in points of detail
22、 from this standard. It is important that the manufacturers instructions are followed.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”.Commentary, explana
23、tion and general informative material is presented in smaller italic type, and does not constitute a normative element.BS 6798:2014iv The British Standards Institution 2014BRITISH STANDARDContractual and legal considerationsThis publication does not purport to include all the necessary provisions of
24、 a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.In particular, attention is drawn to the following statutory regulations. The Gas Safety (Installation and Use) Regulations 1998 1; The Gas Safety (Installa
25、tion and Use) (Northern Ireland) Regulations 2004 2; The Gas Safety (Installation and Use) Regulations 1994, as amended and applied by the Gas Safety (Application) (Isle of Man) Order 1996 3; The Health and Safety (Gas) (Guernsey) Ordinance 2006 4; The Gas Appliance (Safety) Regulations 1995 5; The
26、Building Regulations 2010 (England and Wales), as amended 6; The Building Regulations (Northern Ireland) 2012 7; The Building (Scotland) Regulations 2004, as amended 8; The Building Regulations 2007 (for the Isle of Man) 9; The Water Supply (Water Fittings) Regulations 1999, as amended 10; The Water
27、 Byelaws 2004 (Scotland) 11; The Water Supply (Water Fittings) Regulations (Northern Ireland) 2009 12. The British Standards Institution 2014 1BS 6798:2014BRITISH STANDARD1 ScopeThis British Standard specifies requirements for the selection, installation, inspection, commissioning, servicing and mai
28、ntenance of gas-fired boilers for central heating and other purposes, which have a total rated heat input not exceeding 70 kW based on net calorific value. This includes cookers with integral boilers used to provide central heating.It applies to boilers utilizing 1st, 2nd or 3rd family gases designe
29、d to operate in the condensing or non-condensing mode for the heating of domestic dwellings or domestic dwellings in commercial premises by the circulation of heated water in open or closed systems.This standard does not apply to:a) boilers with a rated input of over 70 kW; orb) groups of boilers wi
30、th individual ratings of 70 kW or less, but with aggregate inputs of over 70 kW as specified in BS 6644.NOTE 1 Groups of boilers with individual ratings of less than 70 kW, but with a maximum aggregate input of 70 kW, may be installed to this standard but specialist advice on the system design, inst
31、allation and control needs to be sought from the appliance manufacturer.It is not applicable to the detailed design and installation of the whole heating system, which is specified in BS EN 12828, BS EN 12831:2003 (incorporating corrigendum January 2009) and BS EN 14336:2004 (incorporating corrigend
32、um January 2009).NOTE 2 With the publication of BS EN 12828, BS EN 12831 and BS EN 14336, BS 5449 has been withdrawn. These Standards are not aligned to UK design and installation practices; they cover commercial as well as domestic heating systems and exclude hot water. Consequently, these standard
33、s include UK national annexes covering all the relevant material from BS 5449.NOTE 3 The installation of boilers with a rated input greater than 70 kW is covered by BS 6644. Additional requirements for the installation of back boiler units are specified in BS 58711 and BS 58712.This standard applies
34、 to boilers which carry a CE mark and also to previously-used boilers which do not carry the CE mark (see 6.2.1).NOTE 4 In this standard, heat input is expressed in terms of net calorific values (CV), unless stated otherwise. The ratio of gross to net heat input is approximately 1.11:1 for natural g
35、as, 1.09:1 for propane, and 1.08:1 for butane.NOTE 5 It is essential that persons carrying out the installation of any gas appliance are competent to do so. Clause 4 gives information on competence.NOTE 6 Some clauses of this standard might be appropriate for the installation of pool and spa heaters
36、. The manufacturers instructions might advise which parts are not appropriate. For example, for direct spa and pool heaters, no corrosion inhibitors or chemical cleaning are permitted.NOTE 7 The general installation requirements for 3rd family installations specified by this standard also apply to g
37、as installations supplied with LPG/air mixtures used in the Channel Islands or the Isle of Man, providing: any gas equipment being installed has been appropriately converted and is suitable for the gas being supplied, and the requirements of the standard do not conflict with local regulations or aut
38、horized local custom and practice.BS 6798:20142 The British Standards Institution 2014BRITISH STANDARD2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cite
39、d applies. For undated references, the latest edition of the referenced document (including any amendments) applies.BS 476-22, Fire tests on building materials and structures Part 22: Methods for determination of the fire resistance of nonloadbearing elements of constructionBS 1179-6, Glossary of te
40、rms used in the gas industry Part 6: Combustion and utilization including installation at consumers premisesBS 5258-1, Safety of domestic gas appliances Part 1: Specification for central heating boilers and circulatorsBS 5258-8, Specification for safety of domestic gas appliances Part 8: Combined ap
41、pliances: gas fire/back boiler 1)BS 5422:2009, Method for specifying thermal insulating materials for pipes, tanks, vessels, ductwork and equipment operating within the temperature range 40 C to +700 CBS 5440-1, Flueing and ventilation for gas appliances of rated input not exceeding 70 kW net (1st,
42、2nd and 3rd family gases) Part 1: Specification for installation of gas appliances to chimneys and for maintenance of chimneys 2)BS 5440-2, Flueing and ventilation for gas appliances of rated input not exceeding 70 kW net (1st, 2nd and 3rd family gases) Part 2: Specification for the installation and
43、 maintenance of ventilation provision for gas appliancesBS 5482-1, Code of practice for domestic butane and propanegasburning installations Part 1: Installations at permanent dwellings, residential park homes and commercial premises, with installation pipework sizes not exceeding DN 25 for steel and
44、 DN 28 for corrugated stainless steel or copperBS 5482-2, Code of practice for domestic butane and propanegasburning installations Part 2: Installations in caravans and nonpermanent dwellingsBS 5970, Thermal insulation of pipework, ductwork, associated equipment and other industrial installations in
45、 the temperature range of 100 C to +870 C Code of practiceBS 6644, Specification for the installation and maintenance of gasfired hot water boilers of rated inputs between 70 kW (net) and 1.8 MW (net) (2nd and 3rd family gases)BS 6891, Installation of low pressure gas pipework of up to 35 mm (R1) in
46、 domestic premises (2nd family gas) SpecificationBS 7671, Requirements for electrical installations IET Wiring Regulations Seventeenth edition 3)BS 7927, Heating appliances for domestic applications Portable apparatus designed to detect and measure specific combustion flue gas products RequirementsN
47、OTE 1 BS 7927 has been superseded by BS EN 503793.BS 7977-2, Specification for safety and rational use of energy of domestic gas appliances Part 2: Combined appliances: Gas fire/back boiler1)Withdrawn. Superseded by BS 7977-2.2)This standard also gives an informative reference to BS 5440-1:2008.3)Th
48、is standard also gives an informative reference to BS 7671:2008. The British Standards Institution 2014 3BS 6798:2014BRITISH STANDARDBS EN 1491, Building valves Expansion valves Tests and requirementsBS EN 12828, Heating systems in buildings Design for waterbased heating systems 4)BS EN 12831:2003 (
49、incorporating corrigenda January 2009 and September 2013), Heating systems in buildings Method of calculation of the design heat loadBS EN 13831, Closed expansion vessels with built in diaphragm for installation in waterBS EN 14336:2004 (incorporating corrigenda January 2009 and September 2013), Heating systems in buildings Installation and commissioning of water based heating systemsBS EN 50291, Electrical apparatus for the detection of carbon mon
