BS EN 14785:2006

Foreword
1 Scope
2 Normative references
3 Terms and definitions
  3.1 Appliances
  3.2 Functional characteristics
  3.3 Characteristics
  3.4 Fuels
4 Materials, design and construction
  4.1 Production documentation
  4.2 General construction requirements
  4.3 Flue spigot or socket
  4.4 Combustion control device
  4.5 Flueways
  4.6 Cleaning tools
  4.7 Firedoors
  4.8 Combustion air supply
       4.8.1 Primary air inlet control
       4.8.2 Secondary air inlet control
  4.9 Internal flue gas diverter
  4.10 Retort
  4.11 Ashpan and ash removal
  4.12 Integral boiler
       4.12.2 Nominal minimum wall thickness (steels)
       4.12.3 Welding seams and welding fillers
       4.12.4 Minimum wall thicknesses (cast iron)
       4.12.5 Cast iron parts subject to water pressure
       4.12.6 Venting of the water sections
       4.12.7 Water tightness
       4.12.8 Water side connections
       4.12.9 Boiler internal waterways
  4.13 Control of flue gas
  4.14 Cleaning of heating surfaces
5 Safety
  5.1 Temperatures of adjacent combustible materials
  5.2 Operating tools
  5.3 Safety test for spillage of combustion gas and
      discharge of embers
  5.4 Temperature in the fuel hopper
  5.5 Safety against back burning through the fuel conveyor
      system
  5.6 Safety against overheating the boiler water
  5.7 Thermal discharge control
  5.8 Strength and leak tightness of boiler shells
  5.9 Electrical safety
6 Performance
  6.1 Flue draught
  6.2 Flue gas temperature
  6.3 Carbon monoxide emission for pellet stoves
  6.4 Efficient energy utilization
       6.4.1 General
       6.4.2 Efficiency at nominal heat output and at
             reduced heat output
  6.5 Nominal heat output
  6.6 Reduced heat output
  6.7 Water heating output
  6.8 Space heating output
  6.9 Hopper capacity
  6.10 User operations
7 Appliance instructions
  7.1 General
  7.2 Installation instructions
  7.3 User operating instructions
8 Marking
9 Evaluation of conformity
  9.1 General
  9.2 Type testing
      9.2.1 Initial type testing
      9.2.2 Further type testing
  9.3 Factory production control (FPC)
      9.3.1 General
      9.3.2 Raw materials and components
      9.3.3 Control of inspection, measuring and test
            equipment
      9.3.4 Process control
      9.3.5 Product inspection, testing and evaluation
      9.3.6 Non-conforming products
      9.3.7 Corrective and preventive action
      9.3.8 Handling, storage, packaging, preservation
            and delivery
Annex A (normative) Test methods
      A.1 Test environment
          A.1.1 Ambient room temperature
          A.1.2 Cross-draught
          A.1.3 External sources
      A.2 Test assembly
          A.2.1 General
          A.2.2 Trihedron
          A.2.3 Measurement section
          A.2.4 Connection of appliance to measurement
                section
          A.2.5 Water circuit for appliances with
                boilers
      A.3 Measurement equipment
      A.4 Test procedures
          A.4.1 Appliance installation
          A.4.2 Calculation of fuel load
          A.4.3 Fuelling and de-ashing the fire
          A.4.4 Flue gas losses
          A.4.5 Water heating output
          A.4.6 Combustible heat losses in the residue
          A.4.7 Performance test at nominal heat output
          A.4.8 Reduced heat output test
          A.4.9 Safety tests
      A.5 Test results
      A.6 Calculation methods
          A.6.1 Notations and units used
          A.6.2 Formulae
      A.7 Test report
Annex B (normative) Test fuels and recommended fuels
      B.1 General
      B.2 Test fuel
          B.2.1 Selection of test fuel
          B.2.2 Storage, preparation and analysis
      B.3 Tests for recommended fuels
          B.3.1 Basis of testing
          B.3.2 Test methods and criteria
Annex ZA (informative) Clauses of this European Standard
         addressing the provisions of the EU Construction
         Products Directive
      ZA.1 Scope and relevant characteristics
      ZA.2 Procedure for attestation of conformity of
           residential space heating appliances fired by
           wood pellets
           ZA.2.1 System of attestation of conformity
           ZA.2.2 EC Certificate and Declaration of conformity
      ZA.3 CE marking and labelling
Bibliography

Describes requirements relating to the design, manufacture, construction, safety and performance (efficiency and emissions), instructions and marking together with associated test methods and test fuels for type-testing residential space heaters fired by wood pellets, and mechanically fed up to 50 kW nominal heat output.

This European Standard specifies requirements relating to the design, manufacture, construction, safety and performance (efficiency and emissions), instructions and marking together with associated test methods and test fuels for type-testing residential space heaters fired by wood pellets, and mechanically fed up to 50 kW nominal heat output.

These appliances may be freestanding or inset appliances and provide heat into the space where they are installed and may be operated with either natural draught or fan-assisted combustion air. Additionally, where fitted with a boiler, they also provide domestic hot water and/or central heating. These appliances burn wood pellets only, in accordance with the appliance manufacturer\'s instructions. They operate with firedoors closed only.

Non mechanically fed appliances burning solid mineral fuels, peat briquettes and natural or manufactured wood logs are not included in this European Standard, but are covered by EN 13229 and EN 13240.

NOTE These appliances may have an integral fuel hopper or be combined with an external fuel hopper.