BS EN 304:2017 pdf download.Heating boilers – Test code for heating boilers for atomizing oil burners.
BS EN 304 applies to the determination of the performances of heating boilers and combi boilers tired by liquid fuels. The requirements for the heating performances are laid down in EN 303-1:2017 and EN 303-2:2017.
This test code includes the requirements and recommendations for carrying out and evaluating the procedure for testing boilers and also the details of the technical conditions under which the tests will be carried out.
The requirements and the performance of testing for the sanitary hot water production of combi boilers are laid down in prEN 3 03-6.
2 Normative references
The following documents, in whole or in part, are normatively referenced in BS EN 304 and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 267:2009+A1:201 1, Automatic forced draught burnersforliquidfuels
The boiler is installed in accordance with the technical instructions in a well-ventilated, draught free room (air speed less than 0,5 m/s), which has an ambient temperature of (20 ± 5) K. The boiler is protected from direct solar radiation.
The settings of the burner shall not be manually changed after adjustment. No change shall be made to the water flow or any other test parameter during one test period.
The temperature, pressure and composition of the products of combustion shall be measured continuously and shall be recorded with a sampling rate below 10 s.
The flow temperature tF and the return temperature tR shall not differ by more than 0,5 K/h x test period [hj at the beginning and the end of the test period.
6.4.2 Draught adjustment
6.4.2.1 Boilers operating under negative pressure
For boilers operating under negative pressure the draught at the boiler outlet shall be adjusted so that there is a negative pressure in the combustion chamber. The draught shall be measured.
These heat losses are calculated in A.7
6.6 Determination of the waterside resistance
The hydraulic resistance of a boiler (measured in mbar) shall be determined for the water rate corresponding to operation of the boiler at the nominal heat input with a water flow temperature of 80 °C and a temperature difference between the flow and the return water of 20 K.
Other conditions are accepted if documented.
The test is carried out with the water at ambient temperature.
The test rig is specified in Figure 1. Before or after the test, the two test pipes are connected directly to each other in order to determine their own resistance for the specified flow rate.BS-EN-304-2017