NBN EN 777-3 : 2009

Foreword
1 Scope
2 Normative References
3 Definitions
  3.1 System and its constituent parts
  3.2 Adjusting, control and safety devices
  3.3 Operation of the system
  3.4 Gases
  3.5 Conditions of operation and measurement
  3.6 Country of destination
4 Classification of Systems
  4.1 Classification according to the nature of the gases
      used (categories)
  4.2 Classification according to the gases capable of
      being used
  4.3 Classification according to the mode of evacuation of
      the combustion products
5 Constructional Requirements
  5.1 General
  5.2 Requirements for adjusting, control and safety devices
  5.3 Ignition devices
  5.4 Main burners
  5.5 Pressure test points
  5.6 Injectors
6 Operational Requirements
  6.1 Soundness
  6.2 Heat inputs
  6.3 Limiting temperatures
  6.4 Ignition, cross-lighting and flame stability
  6.5 Pressure governor
  6.6 Combustion
  6.7 Air-proving device in the common duct
  6.8 Prolonged performance
  6.9 Measurement of oxides of Nitrogen, NO[x]
7 Test methods
  7.1 General
  7.2 Construction and design
  7.3 Safety of operation
  7.4 Other pollutants
8 Marking and instructions
  8.1 Marking of the system and the packaging
  8.2 Instructions
  8.3 Presentation
Annex A (informative) System F
Annex B (informative) National situations
Annex C (informative) Equivalence rules
Annex D (informative) Calculation of the mass flow rate
        of flue gases (see Table D.1)
Annex E (normative) Identification of the type of gas
        in use in the various countries
Annex F (normative) Special national conditions
Annex G (informative) Example of calculation of the
        weighting factors for a system with several
        rates
Annex H (informative) Calculations of conversions of NO[x]
Annex I (informative) National situations of countries
        whose national bodies are CEN associate members
Annex ZA (informative) Clauses of this European Standard
         addressing essential requirements or other
         provisions of EU Directives
Bibliography

Specifies the requirements and test methods for the construction, safety, classification and marking of non-domestic gas-fired overhead radiant tube heaters incorporated into a multi-burner system with each burner unit under the control of an automatic burner control system. Applicable to Type B[22x] and Type B[23x] systems intended for use in other than domestic dwelling, in which the supply of combustion air and/or evacuation of the products of combustion is achieved by mechanical means. Applicable to systems which are intended to be type tested.