Standard

NS-EN 303-4:1999

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Abstract

This standard is applicable to heating boilers with forced draught oil burners up to a nominal heat output of 70 kW. They are operated, either with negative pressure (natural draught boiler) or with positive pressure (pressurised boiler) in the combustion chamber, in accordance with the boiler manufacturer's instructions. This standard specifies the necessary terminology, the requirements on the materials and testing of them, and marking requirements for heating boilers. The boilers are suitable for open vented systems up to a maximum allowable pressure of 1 bar (class 1 pressure) and open and closed water systems up to a maximum allowable pressure of 3 bar (class 2 pressure). The boilers are capable of operating with either conventional flues or low level discharge flues as specified by the boiler manufacturer. The boilers are provided as matched units with factory fitted burners for burning kerosene or gas oil. When using a low level flue gas discharge only kerosene may be used (see annex B). The requirements of this standard apply to heating boilers which are tested on an authorised test rig in accordance with EN 304 and annex B of this standard. Boilers in accordance with this standard are designed for the heating of central heating installations in which the heat carrier is water, and the temperature of which is restricted to 95 °C at normal operating conditions. For boilers with a built-in or attached water heater (storage or continuous flow heater) this standard only applies to the parts of the water heater which are necessarily subject to the operating conditions of the heating boiler (heating part). This standard does not apply to gas boilers with atmospheric burners, boilers for solid fuels, oil or gas fired condensation boilers, boilers with oil vaporisation burners and low temperature boilers. For these boilers there are further requirements. NOTE: Low temperature boilers are those operating with a (water) variable temperature up to 40 °C or less, or those which cannot be set at a temperature higher than 55 °C.

Document information

  • Standard from SN
  • Published:
  • Edition: 1
  • Version: 1
  • Document type: NAT
  • ICS 01.040.91
  • ICS 91.140.10
  • National Committee SN/K 39

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