UNI EN 777-4 : 2009

Foreword
1 Scope
2 Normative references
3 Terms and definitions
  3.1 System and its constituent parts
  3.2 Combustion circuit
  3.3 Adjusting, control and safety devices
  3.4 System operation
  3.5 Gases
  3.6 Conditions of operation and measurement
  3.7 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 regulator
  6.6 Combustion
  6.7 Prolonged performance
  6.8 Measurements 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
9 Evaluation of conformity of POCEDs and their associated
  terminals
  9.1 General
  9.2 Type testing
  9.3 Factory production control (FPC)
Annex A (informative) National situations
Annex B (informative) System H
Annex C (informative) Equivalence rules
Annex D (informative) Calculation of the mass flow rate
        of flue gases
Annex E (informative) Identification of gas types in use
        in 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) Calculation of conversions of NO[x]
Annex I (informative) National situations of countries whose
        national bodies are CEN associate members
Annex J (informative) An example of sampling plans
Annex K (informative) Flue determination
Annex ZA (informative) Clauses of this European Standard
         addressing essential requirements or other provisions
         of EU Directives
Annex ZB (informative) Clauses of this European Standard
         addressing the provisions of the EU Construction
         Products Directive
Bibliography

Describes the requirements and test methods for the construction, safety, classification and marking of non-domestic gas-fired overhead radiant tube systems incorporating two or more burner units with each burner under the control of an automatic burner control system, and operated by a single fan providing a single flue outlet, called system H and referred to in the body of the text as the "system".