EN 777-2:2009

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 Prolonged performance
  6.8 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
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 E
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
        flue gas mass flow rate
  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 E 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 B52 and Type B53 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 dwelling;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 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 of the gas and all combustion air is carried out in a part of the burner upstream of the combustion zone;f)systems that are designed for continuous condensation within the flue system under normal operating conditions;g)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.NOTERequirements 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.