Standard NBN EN 297:1994

Gas-fired central heating boilers - Type B11 and B11BS boilers fitted with atmospheric burners of nominal heat input not exceeding 70 kW
Publication date
Replaced by
91.140.10 Central heating systems
Summary :
This European Standard specifies the requirements and test methods for the construction, safety, fitness for purpose, rational use of energy, classification and marking of gas-fired central heating boilers, hereafter referred to as 'boilers'. This standard applies to type B11 and BB11BS boilers: - fitted with atmospheric burners; - that use gases corresponding to the three gas families and to the pressures stated in 4.1.4; - that have a nominal heat input not exceeding 70 kW (on net calorific valu
e); - where the temperature of the water does not exceed 95 øC during normal operation; - where the maximum water-side operating pressure does not exceed 6 bar. This standard does not contain all the necessary requirements for: boilers: - intended to be installed in the open; - having multiple heating units with a single draught diverter; - with fan-assisted combustion; - of the condensing type; i- ntended to be connected to a common flue having mechanical extraction; - fitted with manual or automatic means of adjusting the air supply and/or adjusting the evacuation of the combustion products; - of the combination type (central heating and domestic hot water productio
n); appliances: - combining the functions of an independent space heater and a hot water generator for central heating. This standard only covers type testing.
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