BS EN 15821-2010 pdf download.Multi-firing sauna stoves fired by natural wood logs Requirements and test methods.
For the purposes of testing, appliances may be grouped into families, where it Is considered that the selected performance characteristic or characteristics, especially in respect of those detailed in Table 1 and Table 2, is/are common to all appliances within that family.
8.2 Initial type testing
8.2.1 General
Initial type testing (ITT) shall be performed to demonstrate conformity to this standard. In the case of an appliance already in production the appliance to be tested shall be chosen at random and be representative of general production and a written declaration to this effect shall be provided by the manufacturer.
In the case of a prototype, the appliance tested shall be a model representative of the Intended future production and the manufacturer shall provide a written declaration that this is the case. When the appliance goes into production, a dimensional and constructional check shall be undertaken on the production appliance to confirm it Is in agreement with the originally type tested prototype model. If the dimensions of the production appliance diverge by more than 1 % of the dimension or ±3 mm whichever is the lesser from that of the prototype in relation to the firebox and/or combustion chamber and any other dimension considered to be critical to the safety or performance of the appliance (especially in respect of the characteristics of Table 1 and Table 2), then the production appliance itself shall be subjected to further type testing as detailed in 8.2.2.
Similaily, if there is a change to the construction materials used which will adversely alter the performance characteristics of the appliance especially as regards its safety and/or the meeting of the performance characteristics of Table 2 then the production appliance itself shall be subject to further type testing as detailed in 8.2.2. This requirement regarding re-testing shall be applied if, during the subsequent production or at the start of a new production run, such a change is made to dimensions and/or construction materials. To ensure that this takes place, there shall be a dimensional/constructional check on a current production appliance over an ongoing period not exceeding 3 years to demonstrate conformity to type.
Where tests have been previously performed in accordance with the provisions of this standard (same product. same characteristic(s), test method, sampling procedure, system of attestation of conformity, etc.), then the results of these tests shall be taken into account for initial type testing purposes.
For a family or range of appliances, it shall be permissible to test only selected appliances across the family or range and to only verify selected constructional and performance characteristics on the others, subject to a clear decision being made that the appliances are part of a family or range of appliances. For the initial type test, at least a sufficient number of the appliances shall be chosen from across the family or range so as to represent adequately the family or range. The chosen appliances shall be subjected to complete testing to fully verify their compliance with all of the constructional and performance characteristics in accordance with this standard. For the other appliances in the family or range not chosen for complete testing, it shall be permissible to only verify selected constructional and/or performance characteristics to ensure their compliance with the requirements of this standard and/or to ensure they will perform the same as the fully type tested appliances of the family or range.
In selecting appliances for initial type testing from a product range based upon their nominal heat outputs as representing such a family, then appliances having the lowest and highest claimed nominal heat Outputs shall be tested together with sufficient appliances chosen from within the range that the ratio of nominal heat output between the appliances does not exceed the ratio of 16:1.
Further, In deciding that the appliances belong to a family or range due account shall be taken of the construction and performance characteristics of each appliance especially in respect of the list of characteristics detailed in Table 1 and Table 2. The list of characteristics in Table 1 and Table 2 is not definitive and other aspects may need to be considered in making this judgement. Where a range of appliances of the same tirebox and output have differing canopies or external cladding both in size and materials of construction (e.g. where the hot surface would be likely to be closer to combustible surfaces or there is a change from a lower to a higher conductivity or emissivity material), then at least one appliance shall be chosen, which represents the worst scenario case and demonstrates the safety of the range as regards surface temperature and safety of adjacent combustible materials.
Where conformity is claimed to the standard for a family of appliances on a number of different fuel types, a
selection of tests shall be made which demonstrates the conformity of the family in respect of the safety (Clause
5) and performance (Clause 6) on these fuels on the appliances especially to the list of characteristics detailed
In Table 1 and Table 2.
The parameters, characteristics examined and considerations taken into account in making the decisions in relation to the family or range of appliances shall be recorded and a copy included in the production documentation for each appliance of the family or range (see 4.1).
8.2.2 Initial type testing for appliance changes
Whenever a change occurs in either the appliance design, the raw material, the supplier of the components, or the production process, which would significantly alter the performance characteristics of the appliance especially in respect of one or more of the list of characteristics detailed in Table 1 and Table 2, the initial type tests shall be repeated for the appropriate characteristic(s).BS EN 15821-2010 pdf download.