ONORM EN 304 : 2018

Foreword
1 Scope
2 Normative references
3 Principles of tests
4 Measuring instruments and methods
5 Tests
5.1 Determination of the heat output and the
      efficiency of the boiler
5.2 Determination of the rated heat output
5.3 Determination of the boiler efficiency (direct
      method)
5.4 Test operation
5.5 Calculation
5.6 Determination of the waterside resistance
5.7 Determination of the standby loss
5.8 Functional test for the temperature thermostat
      control and system limit thermostat control on the
      boiler
5.9 Surface temperature
5.10 Floor temperatures
5.11 Emission values of NOx and CO
6 Test report and other documents
Annexes
A Measurements (normative)
B Applicable symbols and units (informative)
C Performance tests (informative)
D Criteria for the adaptation of atomizing oil
      burners to heating boilers for liquid fuels
      (informative)
E Hints for setting up and evaluation of the test rig
      (informative)
F Determination of the heat losses from the test rig
      and the heat contributions of the circulating pump of
      the test rig (informative)
G Determination of the time t1 (informative)
ZA Clauses of this European Standard addressing essential
      requirements or other provisions of EU Directives

Covers the requirements and recommendations for evaluating and carrying out the procedure for testing boilers. Also details the technical conditions under which the tests shall be carried out. Coverage includes: measuring instruments and methods; determination of the heat output; determination of the boiler efficiency (direct method); determination of the waterside resistance; surface temperature; floor temperatures. Also includes detailed annexes.