BS EN 777-3:2009

BS EN 777-3:2009 Multi-burner gas-fired overhead radiant tube heater systems for non-domestic use. System F. Safety

BS EN 777-3 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.

BS EN 777-3 applies to systems 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.

BS EN 777-3 does not apply to:

• Systems designed for use in domestic dwelling
• Outdoor systems
• Systems of heat input in excess of 120 kW (based on the net calorific value of the appropriate reference test gas)
• Systems having a draught diverter between the exhaust fan and the flue duct
• Systems having fully pre-mixed gas and air burners in which either the gas and all the combustion air are brought together just before the level of the combustion zone; or the pre-mixing of the gas and all combustion air is carried out in a part of the burner upstream of the combustion zone.
• Systems that are designed for continuous condensation within the flue system under normal operating conditions
• Systems having combustion products evacuation ducts that are non-metallic.

Contents of BS EN 777-3:

• Foreword
• Scope
• Normative references
• Terms and definitions
• System classification
• Constructional requirements
• Operational requirements
• Test methods
• Marking and instructions
• Evaluation of conformity of POCEDs and their associated terminals
• National situations
• System F
• Equivalence rules
• Calculation of the mass flow rate of flue gases
• Identification of gas types in use in various countries
• Special national conditions
• Calculation example of the weighting factors for a system with several rates
• NOx conversion calculation
• An example of sampling plans
• Clauses of this European Standard addressing essential requirements or other provisions of
• EU Directives
• Clauses of this European Standard addressing the provisions of the EU Construction Products Directive
• Scope and relevant characteristics
• Procedure(s) for attestation of conformity of [construction products]
• CE marking and labelling
• Bibliography