BS 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
      A.1 General
      A.2 Categories listed in the body of the
          standard and marketed in different
          countries
      A.3 Appliance supply pressures corresponding
          to the categories given in A.2
      A.4 Special categories marketed nationally or
          locally
      A.5 Test gases corresponding to the special
          categories given in A.4
      A.6 Gas connections in the various countries
      A.7 Flue connections in the various countries
Annex B (informative) - System H
Annex C (informative) - Equivalence rules
      C.1 Conversion to categories within a restricted
          Wobbe Index range
      C.2 Conversion to categories within an identical
          Wobbe Index range
      C.3 Conversion to categories within a wider
          Wobbe Index range
Annex D (informative) - Calculation of the mass flow rate
        of flue gases
      D.1 Flue gas mass flow rate
      D.2 Quantity of air in the flue gas
      D.3 Flue gas excess air ratio (lambda)
      D.4 Quantity of water vapour in the flue gas
      D.5 Quantity of Nitrogen in the flue gas
      D.6 Quantity of Oxygen in the flue gas
      D.7 Dry quantity of flue gas
      D.8 Quantity of carbon dioxide in the flue gas
Annex E (informative) - Identification of gas types in use
        in various countries
Annex F (normative) - Special national conditions
      F.1 General
Annex G (informative) - Example of calculation of the
        weighting factors for a system with several rates
      G.1 Appliance rates
      G.2 Weighting of Q[pi],% = 20
      G.3 Weighting of Q[pi],% = 40
      G.4 Weighting of Q[pi],% = 60
      G.5 Weighting of Q[pi],% = 70
      G.6 Total weighting
Annex H (informative) - Calculation of conversions
        of NO[X]
      H.1 NO[X] emission conversion factors
      H.2 NO[X] Conversion - Calculation
Annex I (informative) - National situations of countries
        whose national bodies are CEN associate
        members
Annex J (informative) - An example of sampling plans
      J.1 Sampling plans
      J.2 Inspection levels and procedures
Annex K (informative) - Flue determination
      K.1 General conditions of test
      K.2 Test conditions
      K.3 Test procedure
      K.4 Accuracy of measurement
      K.5 Calculation of Flue Loss
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
      ZB.1 Scope and relevant characteristics
      ZB.2 Procedure(s) for attestation of conformity of
           [construction products]
      ZB.3 CE marking and labelling
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".

This European Standard specifies 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”. This standard is applicable to Type B52 systems (see 4.3) intended for use in other than domestic dwellings, in which the supply of combustion air and the evacuation of the products of combustion is achieved by mechanical means. This standard is applicable only to such systems that have fully pre-mixed gas/air burners. This standard is not applicable to: a) systems designed for use in domestic dwellings; b) outdoor systems; c) systems of heat input in excess of 120 kW (based on the net calorific value of the appropriate reference test gas); d) systems having a draught diverter; e) systems that are designed for continuous condensation within the flue system under normal operating conditions; f) systems having combustion products evacuation ducts that are non-metallic. This standard is applicable to systems which are intended to be type tested. It also includes requirements concerning the evaluation of conformity, including factory production control, but these requirements only apply to POCEDs and their associated terminals. NOTE Requirements for systems which are not intended to be type tested would need to be subject to further consideration. Requirements concerning the rational use of energy have not been included in this European Standard.