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BS EN 15502-2-2:2024

BS EN 15502-2-2:2024

$198.66

Gas-fired central heating boilers – Specific standard for type B1 appliances

Published By Publication Date Number of Pages
BSI 2024 60
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This document specifies, the requirements and test methods concerning the classification and marking of gas-fired central heating boilers that are fitted with atmospheric burners, fan assisted atmospheric burners and are hereafter referred to as “boilers”. Where the word boiler is used, this is intended to be read as the boiler including its connecting ducts, ducts and terminals, if any. This document covers gas-fired central heating boilers type B11, B11BS, B12, B12BS, B13, B13BS: NOTE 1 For further background information on appliance types see EN 1749:2020. a) that have a nominal heat input (on the basis of net calorific value) not exceeding 70 kW; b) that use one or more combustible gases of the three gas families at the pressures stated in EN 437:2021; c) where the temperature of the heat transfer fluid does not exceed 105 °C during normal operation; d) where the maximum operating pressure in the water circuit does not exceed 6 bar; e) which are declared in the technical instructions to be either a “low temperature boiler” or a “standard boiler”. If no declaration is given the boiler is to be considered a “standard boiler”; f) which are intended to be installed inside a building or in a partially protected place; g) which are intended to produce also hot water either by the instantaneous or storage principle, as a single unit; h) which are designed for either sealed water systems or for open water systems. NOTE 2 This document provides requirements for boilers with known constructions. For boilers with any alternative constructions, which might not fully be covered by this document, the risk associated with this alternative construction needs to be assessed. An example of an assessment methodology, based upon risk assessment, is given in Clause 11. This document does not cover all the requirements for: aa) appliances that are intended to be connected to gas grids where the quality of the distributed gas is likely to vary to a large extent over the lifetime of the appliance (see Annex AB); ab) appliances using flue dampers; ac) appliances that have a nominal heat input (on the basis of net calorific value) exceeding 70 kW; ad) appliances of the types A, B14, B¬2, B3, B4, B5 and C; ae) appliances intended to be connected to a (common) flue having mechanical extraction; af) appliances with gas/air ratio control; ag) modular boilers; ah) boilers which can give rise to condensation under certain circumstances; ai) boilers intended to be installed in a room with a foreseeable negative pressure relative to the pressure in the flue system; aj) surface temperatures of external parts particular to children and elderly people; ak) appliances that are intended to burn natural gases of the second family where hydrogen is added to the natural gas; al) boilers intended to be installed in areas accessible to elderly people and children; am) boilers equipped with an adaptive combustion control function (ACCF). NOTE Negative pressure relative to the pressure in the flue system can for example be caused by mechanical or thermal ventilation in airtight buildings.

PDF Catalog

PDF Pages PDF Title
2 undefined
13 1 Scope
14 2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Classification
5 Construction
5.1 General
5.2 Conversion to different gases
15 5.3 Materials
5.3.1 General
5.3.2 Materials and thicknesses of walls or tubes with water side operating pressure for boilers of pressure class-3
5.3.3 Domestic water connections
5.3.4 Thermal insulation
5.3.5 Materials in contact with water for human consumption
5.3.6 Durability against corrosion of metallic combustion product circuits
5.4 Method of construction
5.4.1 Design
5.4.2 Checking the state of operation
5.4.3 Use and servicing
5.4.4 Connections to the gas and water pipes
5.4.5 Soundness
5.4.6 Supply of combustion air and evacuation of the combustion products
16 5.4.7 Dampers
5.4.8 Air proving
5.4.9 Gas/air ratio controls
5.4.10 Fan
5.4.11 Drainage
5.4.12 Operational safety in the event of failure of the auxiliary energy
5.4.13 Special provision for low temperature boilers and condensing boilers
5.4.13.1 Materials in contact with condensate
5.4.13.2 Discharge of condensate
5.4.13.3 Control of the combustion products temperature
5.4.13.4 Chemical composition of the condensate
5.4.13.5 Design
5.5 Burners
17 5.6 Pressure test points
5.7 Requirements for the application of control and safety devices
5.8 Additional requirements for modular boilers
6 Electrical and electromagnetic safety
7 Controls
18 8 Operational requirements
8.1 General
8.1.1 Characteristics of the reference and limit gases
19 8.1.2 General test conditions
8.1.2.1 Installation of the boiler
8.1.2.2 Gases used for testing
8.1.2.3 Conduct of the test to obtain a heat input
8.1.2.4 Water circuit
8.1.2.5 Thermal equilibrium
8.1.2.6 General test conditions for combination boilers
8.1.2.7 Electrical supply
8.1.2.8 Tolerances of measurements
20 8.2 Soundness
8.2.1 Soundness of the gas circuit
8.2.2 Soundness of the combustion circuit
8.2.3 Soundness of the water circuit
8.2.4 Soundness of the domestic water circuit
8.3 Hydraulic resistance
8.4 Heat inputs and heat output
8.5 Limiting temperatures
8.5.1 General
8.5.2 Limiting temperatures of the adjusting, control and safety devices
21 8.5.3 Limiting temperatures of the side walls, the front and the top
8.5.4 Limiting temperatures of the test panels and the floor
8.6 Ignition, cross lighting, flame stability
8.6.1 General
8.6.2 Limit conditions
8.6.3 Special flue conditions
8.6.4 Reduction of the gas rate of the ignition burner
22 8.7 Reduction of the gas pressure
8.8 Defective closure of the gas valve immediately upstream of the main burner
8.9 Pre-purge
24 8.10 Functioning of a permanent ignition burner when the fan stops during the standby time
8.11 Adjustment, control and safety devices
26 8.12 Carbon monoxide
27 8.13 NOx
8.14 Special provisions for boilers intended to be installed in a partially protected place
28 8.15 Formation of condensate
8.16 Temperature of combustion products
8.17 Sound power level LWA
29 9 Useful efficiencies
9.1 General
9.2 Useful efficiency at the nominal heat input
9.2.1 Requirements
9.2.2 Tests
9.3 Useful efficiency at part load
9.3.1 Requirements
9.3.2 Tests
30 9.4 Heat output, seasonal energy efficiency and energy consumption
10 Electric auxiliary energy
11 Risk assessment
12 Marking and instructions
12.1 Boiler marking
12.1.1 Data plate
12.1.2 Markings related to the state of adjustment
12.1.3 Packaging
12.1.4 Warnings notices on the boiler and the packaging
12.1.5 Other information
31 12.2 Instructions
12.2.1 Instructions for installation
12.2.1.1 General
32 12.2.1.2 For installation and adjustment of the gas circuit
12.2.1.3 For installation on the central heating circuit
12.2.1.4 For installation of the combustion circuit
12.2.2 Instructions for use and servicing
12.2.3 Conversion instruction
12.3 Presentation
33 101 Figures
41 102 Listing of tables and numbers
42 103 Annexes
43 Annex A (informative)Compilation of the test conditions for the various gas families
48 Annex U (normative)Use of test gases
49 Annex ZA (informative)Left empty on purpose
50 Annex ZB (informative)Left empty on purpose
51 Annex ZC (informative)Left empty on purpose
52 Annex ZD (informative)Left empty on purpose
53 Annex ZE (informative)Relationship between this European Standard and the essential requirements of Regulation (EU) 2016/426 of the European Parliament and of the Council of 9 March 2016 on appliances burning gaseous fuels and repealing Directive 2009/142/EC aimed to be covered

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BS EN 15502-2-2:2024
$198.66