BS EN 777-3:2009 PDF

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.