NEN EN 303-7 : 2006

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Constructional and operational requirements
  4.1 General principles
  4.2 Operational requirements
5 Test methods
  5.1 General principles
  5.2 External tightness of the gas line
  5.3 Heat input rates
  5.4 Gas pressure governor
  5.5 Safety of operation
  5.6 Control and safety equipments
  5.7 Combustion
  5.8 Useful efficiencies
  5.9 Condensation
6 Marking and instructions
  6.1 Marking
  6.2 Instructions
  6.3 Presentation
Annex A (informative) Diameters of combustion products
                      evacuation ducts marketed in the
                      various countries
Annex B (informative) Practical method of calibrating
                      the test rig to enable determination
                      of heat loss D[p]
Annex C (informative) Determination of the heat losses from
                      the test rig of the indirect method
                      and the contributions of the
                      circulating pump of the test rig
Annex D (informative) Determination of the operating time
                      at full rate prior to modulation
Annex E (normative) Determination of the combustion
                      characteristics - Carbon monoxide and
                      nitrogen oxides
Annex F (normative) Case of a forced draught burner
                      complying with EN 676
Annex G (informative) Main symbols and abbreviations used
Annex H (informative) A-deviations
Annex ZA (informative) Clauses of this European Standard
                       addressing essential requirements or
                       other provisions of EU Directives
National Annex NA (informative) Additional information for
UK users
Bibliography

Specifies the requirements and test methods for the construction, the safety and the rational energy usage for gas-fired standard and low temperature central heating boilers equipped with a forced draught burner.