BS 15821:2010 pdf download – Multi-firing sauna stoves fired by natural wood logs — Requirements and test methods
4 Requirements for materials, design and construction
4.1 Production documentation The type of multi-firing sauna stove submitted for testing shall be stated. The parameters and characteristics considered in making the decisions in relation to either the family or range of multi-firing sauna stoves to be submitted for initial type testing (see 8.2.1) shall be recorded. Where changes are made to a multi-firing sauna stove in the design, the raw material, the supplier of the components, or in 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 (see 8.2.2), these shall be recorded. A copy of the parameters and characteristics considered in making the decisions shall be included in the production documentation for each multi-firing sauna stove. To identify a multi-firing sauna stove, related documents and/or scaled assembly drawings shall be available showing the basic design and construction of the multi-firing sauna stove. The documentation and/or the drawings shall include at least the following information: the specification of the materials used in the construction of the multi-firing sauna stove;
the fuel loading mass and, if applicable, the number and mass of any batch charges. For multi-firing sauna stoves, which are supplied as pre-designed units consisting of prefabricated components, designed to be assembled on site, then detailed assembly instructions for the construction of the appliance shall be provided. In addition, details of making a gas tight connection between the chimney, the appliance and the flue gas connector shall also be provided. For testing purposes the multi-firing sauna stove shall be constructed and tested in accordance with these instructions.
4.2 Construction
4.2.1 General construction Design, manufacture and assembly
The shape and dimensions of the components and equipment of multi-firing sauna stoves and the method of design and manufacture and, if assembled on site, the method of assembly and installation shall ensure that, when operated as specified in accordance with the test procedures of this standard and exposed to the associated mechanical, chemical and thermal stresses, the multi-firing sauna stove shall operate reliably and safely so that, during normal operation, no combustion gas posing a hazard can escape into the room in which the multi-firing sauna stove is installed, nor can embers fall out. Non-combustible materials shall be used except for the following applications:
components or accessories fitted outside the multi-firing sauna stove;
internal components of controls and safety equipment;
operating handles.
No part of the multi-firing sauna stove shall comprise any material known to be harmful.
Component parts of the multi-firing sauna stove, which require periodic replacement and/or removal, shall be either so designed or marked for identification to ensure correct fitting. NOTE Because the entire heat dissipating surfaces of the appliance including the flue spigot/socket and the flue gas connector are working surfaces, there is no requirement for limiting the surface temperature of the appliance. Durability The durability aspects of the multi firing sauna stove shall be deemed to be satisfied if it is shown to meet the constructional requirements specified in 4.2.2 to 4.2.10, the safety requirements specified in Clause 5 and the performance requirements specified in Clause 6 of this standard. NOTE The long practice with these products shows that such an approach for dealing with durability is sufficient.
4.2.2 Cleaning of heating surfaces All heating surfaces shall be accessible from the flue gas side for inspection and cleaning with brushes, scrapers or chemical agents by means of sufficient cleaning openings.
4.2.3 Flue spigot or socket The flue spigot or socket shall be designed to enable a gas tight connection to be made between the flue gas connector and the multi-firing sauna stove. Where the flue gas connector fits over an outlet spigot, the overlap shall be a minimum of 25 mm. Where the flues gas connector fits into a socket, the insertion depth shall be a minimum of 25 mm. NOTE It is recommended that provision is made for sealing internal connections with heat resistant sealing compound and/or sealing rope, if required.
4.2.4 Ashpan and ash removal A means for the removal of the ash residue from the multi-firing sauna stove shall be provided. When an ashpan is provided, it shall be capable of containing the combustion residue from two full charges of fuel whilst retaining sufficient space above to allow adequate primary air flow through the bottom grate or firebed. If the ashpan resides in the multi-firing sauna stove, it shall locate in the ashpit in such a way that it allows the free passage of primary air and in such a position that it does not obstruct any primary air inlet control.