EN 15420:2010

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Classification of boilers
5 Constructional requirements
6 Operational requirements
7 Test methods
8 Marking and instructions
Annex A (informative) - National situations
Annex B (informative) - Special national conditions
Annex C (informative) - A-deviations
Annex D (informative) - Classification of type C boilers
Annex E (informative) - Practical method of calibrating the test
        rig to enable the heat loss D[p] to be determined
Annex F (informative) - Main symbols and abbreviations used
Annex G (informative) - Compilation of test conditions
Annex H (informative) - Valving
Annex I (informative) - Determination of the heat losses from the
        test rig of the indirect method and the contributions of
        the circulating pump of the test rig
Annex J (informative) - Means of determining the ignition time at
        full rate
Annex K (informative) - Example of the calculation of the NO[x]
        weighting factors for a boiler with several rates
Annex L (informative) - Calculation of conversions of NO[x]
Annex M (normative) - Test apparatus for type C2 boilers
Annex N (informative) - Requirements and test methods for separate
        air supply and combustion products evacuation ducts of type
        C6 boilers
Annex O (informative) - Use of test gases
Annex ZA (informative) - Clauses of this European Standard
         addressing essential requirements or provisions of EU
         Directives
Bibliography

This document specifies the requirements and test methods concerning, in particular, the construction, safety, fitness for purpose, and rational use of energy, as well as the classification and marking of gas-fired central heating boilers that are fitted with atmospheric burners, fan-assisted atmospheric burners or fully premixed burners, and are hereafter referred to as "boilers".This document applies to boilers of type C, as listed in 4.2:-that use one or more combustible gases of the three gas families at the pressures stated in Tables 14 and 15;-that have a nominal heat input (on the basis of net calorific value) exceeding 70 kW, but not exceeding 1 000 kW, including modular boilers;-where the temperature of the heat transfer fluid does not exceed 105 °C during normal operation;-where the maximum operating pressure in the water circuit does not exceed 6 bar;-which can give rise to condensation under certain circumstances.The document applies to boilers designed for sealed water systems or for open water systems.The document does not contain all the requirements necessary for boilers:-intended to be installed in the open or in living rooms;-permanently fitted with more than one flue outlet;-of the condensing type;-intended to be connected to a common flue having mechanical extraction;-type C21, C41, C51, C61, C7 and C81 boilers;-fitted with a forced draught burner in accordance with EN 676;-producing hot water for domestic purposes.This document only covers type testing.