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BS 6798:2014

Current

Current

The latest, up-to-date edition.

Specification for selection, installation, inspection, commissioning, servicing and maintenance of gas-fired boilers of rated input not exceeding 70 kW net

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-05-2014

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Competence
5 Environmental considerations
6 Selection of equipment and pre-installation
7 Installation
8 Post installation
Annexes
Annex A (normative) - Connection options for
        condensate and combined pressure relief
        valve/condensate discharge
Bibliography

Defines requirements for the selection, installation, inspection, commissioning, servicing and maintenance 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.

Committee
GSE/30
DevelopmentNote
Supersedes BS 6798(2009) & 13/30261683 DC. (06/2014)
DocumentType
Standard
Pages
56
PublisherName
British Standards Institution
Status
Current

This British Standard specifies requirements for the selection, installation, inspection, commissioning, servicing and maintenance of gas-fired boilers for central heating and other purposes, which have a total rated heat input not exceeding 70kW 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 designed 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: boilers with a rated input of over 70kW; or groups of boilers with individual ratings of 70kW or less, but with aggregate inputs of over 70kW as specified in BS6644. NOTE1 Groups of boilers with individual ratings of less than 70kW, but with a maximum aggregate input of ≤70kW, may be installed to this standard but specialist advice on the system design, installation 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 BSEN12828, BSEN12831:2003 (incorporating corrigendum January 2009) and BSEN14336:2004 (incorporating corrigendum January 2009). NOTE2 With the publication of BSEN12828, BSEN12831 and BSEN14336, BS5449 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 standards include UK national annexes covering all the relevant material from BS5449. NOTE3 The installation of boilers with a rated input greater than 70kW is covered by BS6644. Additional requirements for the installation of back boiler units are specified in BS5871‑1 and BS5871‑2. This standard applies to boilers which carry a CE mark and also to previously-used boilers which do not carry the CE mark (see 6.2.1). NOTE4 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 gas, 1.09:1 for propane, and 1.08:1 for butane. NOTE5 It is essential that persons carrying out the installation of any gas appliance are competent to do so. Clause4 gives information on competence. NOTE6 Some clauses of this standard might be appropriate for the installation of pool and spa heaters. The manufacturer’s instructions might advise which parts are not appropriate. For example, for direct spa and pool heaters, no corrosion inhibitors or chemical cleaning are permitted. NOTE7 The general installation requirements for 3rd family installations specified by this standard also apply to gas 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 authorized local custom and practice.

BS 1179-6:1980 Glossary of terms used in the gas industry Combustion and utilization including installation at consumers\' premises
BS 5258-8:1980 Safety of domestic gas appliances Combined appliances: gas fire/back boiler
BS 7927:1998 Heating appliances for domestic applications. Portable apparatus designed to detect and measure specific combustion flue gas products. Requirements
BS 7977-2:2003 Specification for safety and rational use of energy of domestic gas appliances Combined appliances. Gas fire/back boiler
BS EN 1491:2000 Building valves. Expansion valves. Tests and requirements
BS EN 14336:2004 Heating systems in buildings. Installation and commissioning of water based heating systems
BS 6400-2:2006 Specification for installation, exchange, relocation and removal of gas meters with a maximum capacity not exceeding 6 m<sup>3</sup>/h Medium pressure (2nd family gases)
PD 5482-3:2005 Code of practice for domestic butane and propane gas-burning installations Installations in boats, yachts and other vessels
BS 7671(2008) : 2008 REQUIREMENTS FOR ELECTRICAL INSTALLATIONS - IET WIRING REGULATIONS
BS 6400-3:2007 Specification for installation, exchange, relocation and removal of gas meters with a maximum capacity not exceeding 6 m<sup>3</sup>/h Low and medium pressure (3rd family gases)
BS 5482-2:1977 Domestic butane- and propane-gas-burning installations Installations in caravans and non-permanent dwellings
BS 3198:1981 Specification for copper hot water storage combination units for domestic purposes
BS 6400-1:2002 Specification for installation of domestic-sized gas meters maximum rated capacity not exceeding 6 m<sup>3</sup>/h (2nd and 3rd family gases) Low pressure (2nd family gases)
BS 7860:1996 Specification for carbon monoxide detectors (electrical) for domestic use
BS EN 13831:2007 Closed expansion vessels with built-in diaphragm for installation in water
BS 3632:2005 Residential park homes. Specification
BS EN 50379-3:2012 Specification for portable electrical apparatus designed to measure combustion flue gas parameters of heating appliances Performance requirements for apparatus used in non-statutory servicing of gas fired heating appliances
BS 5449:1990 Specification for forced circulation hot water central heating systems for domestic premises
BS EN 1443:2003 Chimneys. General requirements
CR 1472:1997 General guidance for the marking of gas appliances
BS EN 50291:2001 Electrical apparatus for the detection of carbon monoxide in domestic premises. Test methods and performance requirements
BS EN 1856-1:2009 Chimneys. Requirements for metal chimneys System chimney products
BS 5546:2010 Specification for installation and maintenance of gas-fired water-heating appliances of rated input not exceeding 70 kW net
BS EN 12828 : 2012 HEATING SYSTEMS IN BUILDINGS - DESIGN FOR WATER-BASED HEATING SYSTEMS
BS EN 12831:2003 Heating systems in buildings. Method for calculation of the design heat load
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°C
PD CEN/TR 1749:2014 European scheme for the classification of gas appliances according to the method of evacuation of the combustion products (types)
BS EN ISO 4126-1 : 2013 SAFETY DEVICES FOR PROTECTION AGAINST EXCESSIVE PRESSURE - PART 1: SAFETY VALVES (ISO 4126-1:2013)
BS 5871-2:2005 Specification for the installation and maintenance of gas fires, convector heaters, fire/back boilers and decorative fuel effect gas appliances Inset live fuel effect gas fires of heat input not exceeding 15 kW, and fire/back boilers (2nd and 3rd family gases)
BS 476-22:1987 Fire tests on building materials and structures Method for determination of the fire resistance of non-loadbearing elements of construction

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