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BS EN 303-5:2021+A1:2022:2023 Edition

BS EN 303-5:2021+A1:2022:2023 Edition

$215.11

Heating boilers – Heating boilers for solid fuels, manually and automatically stoked, nominal heat output of up to 500 kW. Terminology, requirements, testing and marking

Published By Publication Date Number of Pages
BSI 2023 114
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PDF Catalog

PDF Pages PDF Title
2 undefined
12 1 Scope
1.1 General
13 1.2 Fuels
14 2 Normative references
17 3 Terms and definitions
24 4 Requirements
4.1 General requirements
4.1.1 General requirements for all boilers
25 4.1.2 General requirements for condensing boilers
4.1.2.1 Materials in contact with condensate
4.1.2.2 Condensate drainage
26 4.1.2.3 Chemical composition of condensate
4.2 Construction requirements
4.2.1 Production documentation
4.2.1.1 Drawings
4.2.1.2 Manufacturing controls
27 4.2.2 Heating boilers (parts) made of steel
4.2.2.1 Execution of welding work
4.2.2.2 Welding seams and welding fillers
4.2.2.3 Parts of steel subject to pressure
32 4.2.2.4 Minimum wall thicknesses
33 4.2.3 Boilers made of cast materials
4.2.3.1 General
4.2.3.2 Cast iron parts subject to pressure
34 4.2.3.3 Minimum wall thicknesses
4.2.4 Design requirements
4.2.4.1 Venting of the water sections
35 4.2.4.2 Cleaning of heating surfaces
4.2.4.3 lnspection of the flame
4.2.4.4 Water tightness
4.2.4.5 Replacement parts
4.2.4.6 Boiler shell tappings
4.2.4.7 Immersion pockets for control and indicating equipment, and safety temperature limiter
36 4.2.4.8 Thermal insulation
4.2.4.9 Water side resistance of the boiler
4.2.4.10 Integral fuel hopper
4.2.4.11 Fuel chamber
37 4.2.4.12 Ash chamber
4.2.5 Requirements for boilers with outside combustion air supply and room sealed appliances
4.2.5.1 Design requirements for boilers for outside combustion air supply
4.2.5.2 Leakage of the boiler
38 4.3 Safety requirements
4.3.1 General
39 4.3.2 Manual stoked boilers
4.3.3 Safety against back burning for automatic stoked boilers
4.3.3.1 General
4.3.3.2 Thermal conductance
40 4.3.3.3 Back flow of ignitable combustion gases into the fuel line or integral hoppers
41 4.3.3.4 Fire propagation into the fuel line or integral hopper
42 4.3.3.5 Alternative verification of safety against back burning
4.3.4 Prevention of the transmission of toxic components
43 4.3.5 Safety against fuel overload of the boiler or interruption in fuel supply
4.3.6 Safety against lack of air supply or insufficient combustion
44 4.3.7 Surface temperatures
4.3.8 Leakage of the boilers category 1
4.3.9 Temperature control and limiting devices
4.3.9.1 General
4.3.9.2 Temperature control and limiting devices for open vented systems
45 4.3.9.3 Temperature control and limiting devices for closed vented system
4.3.9.4 Devices for dissipating excess heat
46 4.3.10 Assessment of additional risk
4.3.11 Additional safety requirements for condensing boilers
47 4.3.12 Additional safety requirements for outside air supply boilers and room sealed appliances
4.3.12.1 Negative pressure in the combustion chamber for boilers category 2
4.3.12.2 Requirements regarding a possible recirculation of flue gas
4.3.13 Heating boiler accessories
4.3.13.1 General
4.3.13.2 Electrical safety
4.3.13.3 Electromagnetic compatibility
48 4.4 Performance requirements
4.4.1 General
4.4.2 Energy efficiency
4.4.2.1 General
4.4.2.2 Boiler efficiency
50 4.4.2.3 Useful efficiency
4.4.2.4 Seasonal space heating energy efficiency
4.4.2.5 Energy efficiency index
4.4.3 Flue gas temperature
4.4.4 Draught
4.4.5 Combustion period
51 4.4.6 Minimum heat output
4.4.6.1 General
4.4.6.2 Requirements for accumulator tanks
4.4.7 Emission limits
4.4.7.1 Emission limits at nominal heat output and minimum heat output
52 4.4.7.2 Seasonal Space Heating Emissions limits
53 5 Test
5.1 Test conditions
5.1.1 General
5.1.2 Choice of boiler and fittings to be tested
54 5.1.3 Condition of the boiler
5.1.4 Type test
5.2 Measuring instruments and methods
55 5.3 Test fuel
57 5.4 Pressure test for boilers of sheet or sheet metal of non-ferrous metal
5.4.1 Tests to be carried out before production
5.4.2 Test during production
58 5.5 Pressure test for boilers of cast iron or non-ferrous metals
5.5.1 Test to be carried out before production
5.5.1.1 Burst test on individual sections
5.5.1.2 Water pressure tests on boiler block
5.5.2 Test during production
5.5.2.1 Cast sections
59 5.5.2.2 Boiler block
5.6 Conducting the boiler performance test
5.6.1 General
5.6.2 Setting up the test rig
60 5.6.3 Measured quantities
61 5.6.4 Test method and test duration
5.6.4.1 Heating boilers with manual stoking
5.6.4.2 Heating boilers with automatic stoking
5.7 Determination of the heat output and the efficiency of the boiler
5.7.1 Method for the measurement of the heat output
5.7.1.1 General
62 5.7.1.2 Determination of heat output in the boiler circuit
5.7.1.3 Determination of heat output by means of a heat exchanger
5.7.2 Determining the nominal heat output
5.7.3 Determining the minimum heat output
63 5.7.4 Verification of nominal heat output with condensation
5.7.5 Verification of the minimum continuous heat output with condensation
5.7.6 Determination of the boiler efficiency (direct method)
5.7.7 Electrical consumption
64 5.8 Determination of the emission values
5.8.1 Heating boiler with manual stoking
5.8.2 Heating boiler with automatic stoking
5.9 Calculation
5.9.1 Boiler heat output
5.9.2 The heat input
5.9.3 Boiler efficiency
5.9.3.1 General
5.9.3.2 Direct method
65 5.9.3.3 Indirect method
5.9.3.4 Calculation of useful efficiency
66 5.9.3.5 Calculation of seasonal space heating energy efficiency
5.9.3.6 Calculation of Energy Efficiency Index (EEI)
5.9.4 Emissions
5.9.4.1 Emissions at nominal heat output and minimum continuous heat output
67 5.9.4.2 Emissions at minimum heat output at intermittent operation
5.9.4.3 Calculation of NOx Emissions based on reference test fuel Nitrogen content
5.9.4.4 Seasonal space heating emissions
5.10 Determination of the waterside resistance
5.11 Surface temperature
68 5.12 Verification of condensate
5.13 Function check of the temperature controller and safety temperature limiter at the boiler
5.14 Function test for the rapidly disconnectable firing system
69 5.15 Function test on the device for dissipating excess heat (partly or non-disconnectable firing system)
5.16 Selected tests to demonstrate functional safety
5.16.1 General
70 5.16.2 Safety test of consequences of fuel overload and effect of a blockage of the fuel supply
5.16.3 Loss of combustion air supply
5.16.4 Resistance to thermal conductance
71 5.16.5 Additional tests for alternative verification of the safety against back burning
5.16.6 Test for gas side leakage
72 5.17 Check of safety for condensing operation
5.18 Additional checks of the safety for boilers with outside combustion air supply
5.18.1 Test of leakage rates
5.18.2 Temperature at combustion air connector
5.18.3 Functional safety and design limits caused by recirculation of flue gas into the combustion air supply
73 6 Test report and other documents
74 7 Marking
7.1 General
7.2 Information on the boiler plate
7.3 Boiler plate requirements
8 Technical documentation, supplied with boiler
8.1 General
75 8.2 Technical information and installation instructions
77 8.3 Operating instructions
78 Annex A (informative)Manual measurement of particles in the gas flow, gravimetric determination of particle load with filter systems
81 Annex B (normative)Design criteria for solutions to prevent back burning
87 Annex C (informative)Installation of boilers with combustion air supply from outside the building
89 Annex D (informative)Recommended limits for substances of content of the condensate
90 Annex E (informative)Recommended analytical methods
91 Annex F (informative)Calculation methods
F.1 Calculation of seasonal space heating energy efficiency
93 F.2 Calculation of Energy Efficiency Index (EEI)
F.3 Seasonal space heating emissions
95 Annex G (normative)Calculation methods for recirculation influence
96 Annex H (informative)A-deviations
102 Annex ZA (informative)Relationship between this European Standard and the essential requirements of Directive2006/42/EC aimed to be covered
104 Annex ZB (informative)Relationship between this European Standard and the ecodesign requirements of Commission Regulation (EU) [2015/1189] [L 193] aimed to be covered
105 Annex ZC (informative)Relationship between this European Standard and the energy labelling requirements of Commission Delegated Regulation (EU) [2015/1187] [L 193] aimed to be covered
108 National Annex (informative) Deviations form United Kingdom

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