EN 777-3:2009

Foreword
1 Scope
2 Normative references
3 Terms and definitions
  3.1 System and its constituent parts
  3.2 Adjusting, control and safety devices
  3.3 System operation
  3.4 Gases
  3.5 Conditions of operation and measurement
  3.6 Country of destination
4 System classification
  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 Air-proving device in the common duct
  6.8 Prolonged performance
  6.9 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 F
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) - Calculation example 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) - NO[x] conversion calculation
  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

This European Standard 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 (called system F and referred to in the body of the text as the “system”) with each burner unit under the control of an automatic burner control system.This standard is applicable to Type B52x and Type B53x systems (see 4.3) intended for use in other than domestic dwellings, in which the supply of combustion air and/or the evacuation of the products of combustion is achieved by mechanical means.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 incorporated between the exhaust fan and the flue duct;e)systems having fully pre-mixed gas and air burners in which:1)either the gas and all the combustion air are brought together just before the level of the combustion zone; or2)the pre-mixing élémentaire dépasse 120 kW (sur le pouvoircalorifique inférieur du gaz de référence approprié) ;d) aux systèmes disposant d'un coupe-tirage antirefouleur entre le ventilateur d’extraction et le conduitd’évacuation des produits de combustion ;e) aux systèmes avec brûleurs à prémélange total dans lesquels :1) le gaz et tout l'air comburant sont mélangés juste avant la zone de combustion ; ou2) le prémélange du gaz et de tout l'air comburant est transporté dans une partie du brûleur en amontde la zone de combustion ;f) aux systèmes conçus pour une condensation continue dans le système d'évacuation dans des conditionsde fonctionnement normales ;g) aux systèmes équipés de conduits d'évacuation des produits de combustion non métalliques.La présente norme est applicable aux systèmes qui sont destinés à subir des essais de type.