EN 303-2-2017 pdf download.Heating boilers – Part 2: Heating boilers with forced draught burners – Special requirements for boilers with atomizing oil burners.
3.2 Terms and definitions relevant to eco-design and labelling regulations terms
3.2.1
sound power level
LWA
A-weighted sound power level, indoors, expressed in dB(A)
3.2.2
package
unit of boilers or combination boilers, temperature control and/or solar devices means a package offered to the end-user containing one or more boilers or combination boilers combined with one or more temperature controls and/or one or more solar devices
Note 1 to entry: Definition based on Labelling Regulation 811/2013 Article 2 – (19) and (20).
4 Performance requirements
4.1 General
All the following performance tests are carried out using an oil forced draught burner in accordance with EN 267.
Multi-stage or modulating burners shall operate within the output range of the boiler.
If the boiler was already tested with a forced draught burner for gaseous fuels in accordance with EN 303-1:2017 and EN 303-3. the tests described in 4.2 and 4.6 need not be performed.
For assembly criteria see Annex A.
4.2 Boiler efficiency
4.2.1 Air ratio for efficiency measurement
The air ratio A for the efficiency measurement shall comply with the following:
— less than 100 kW: with the requirements of Figure 1 in the tolerance ± 10% of A
— from 100 kW up to 1 000 kW:1,18≤A≤ 1,22
4.2.2 Boilers of heat output ≤ 70 kW
The seasonal space heating energy efficiency shall not fall below 86 % based on GCV.
4.3 Draught requirements and gas side resistance
The gas side resistance and draught shall be determined during the eI&iency performance test at nominal load.
For boilers which operate with negative pressure in the combustion chamber, the values of draught requirements shown in Figure 2 shall be met or the corresponding technical documentation and/or manual shall be made available.
For boilers which are operated with positive pressure in the combustion chamber, the values for the flue gas resistance shown in Figure 3 shall be met or the corresponding technical documentation and/or manual shall be made available.
4.4 Emission values
During the tests in accordance with 4.2 (at nominal heat output) the smoke number shall not exceed 1 (see EN 267).
The concentration of unburnt hydrocarbons in the flue gases shall not exceed 10 ppm, except during the first 20 s after release of the fuel. The measurement shall be carried out by a flame ionization detector
(FID).
The emissions of CO while operating the boiler at minimum continuous output and nominal output. shall not exceed 60 mg/kWh on NCV or 56 mg/kWh on GCV.
The emissions of nitrogen oxides, expressed in nitrogen dioxide, shall not exceed:
— For boilers with PN 400 kW: 120 mg/kWh fuel input in terms of GCV.
— For boilers with PN >400 kW: 250 mg/kWh fuel input in terms of GCV.
4.5 Standby heat loss
If the default value of EN 15316-4-1 is not used the standby heat loss for boilers shall be measured in accordance with EN 304.
NOTE For boilers up to 70 kW, the value is used in the calculation of the seasonal space heating energy efficiency.
If the default values of EN 15316-4-1 are not used the auxiliary electricity consumption for boilers shall be measured in accordance with EN 304.
The auxiliary electricity consumption at nominal heat output (eim), the auxiliary electricity consumption at 30 % part load (elrnn) and auxiliary electricity consumption In standby mode (PsB) shall be measured according EN 304.
4.7 Sound power level
The sound power level LWA shall be measured at nominal heat output according to EN 15036-1.
4.8 Samples for testing
The type test determines whether the individual boilers sizes of a type or range meet the requirements laid down in this standard. During the type test the boiler shall be representative of production in its design and equipment.
For boilers in a product range which has the same constructional design it is sufficient to test only the smallest and largest boiler provided the ratio in heat output of the smallest to the largest boiler is less than or equal to 1: 2. If, however, within the same product range. this ratio is larger than 1: 2 then so many intermediate sizes shall be tested so that the ratio of 1: 2 is not exceeded.
The characteristics according to this standard for non-tested boilers are determined by linear
interpolation based on the nominal heat output.
5 Material performance
5.1 General
— Material according to EN 303-1:2017, 4.1.1.3.3 have sufficient resistance regarding corrosion resistance, heat resistance and mechanical stability for non-condensing boilers
— Materials classified as corrosion resistant in Table 2 of EN 303-1:2017 are sufficient resistant as state of the art for low temperature or condensing boilers. Materials not listed as corrosion resistant In Table 2 of EN 303-1:2017 or materials with coating may be tested regarding corrosion resistance according to Annex B and 5.2 and 5.3.
5.2 Test specimen and test duration
At least two serial-production test specimens with the Intended minimum equipment are to be selected
from the boiler series to be tested and subjected to fatigue tests according to the following provisions.
Before beginning the test, the test specimens shall be subjected to a water pressure test according to
EN 303-1:20 17, 5.2.2 resp. 5.3.2.EN 303-2-2017 pdf download.

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