Chimney - Bio Bronpi CAROL-MIXTA Instrucciones De Instalación, Uso Y Mantenimiento

7.

CHIMNEY

ATTENTION: from the point of view of the installation of the stove, it must be considerate as a natural draught (wood
stove), not like a forced draught (pellet stove). Thus, the chimney must be vertical and with a constant section (without
decreasing or increasing pipes), so the horizontal or descent segments are not allowed.
The chimney is of basic importance in the proper functioning of the stove and primarily has two functions:
• Evacuate the smoke and the gas safely out of the house.
• Provide sufficient draft to the stove in order to keep the fire.
Therefore, it is essential that it is made perfectly and that it is subjected to maintenance operations in order to keep it in good condition
(many of the claims due to malfunctioning reasons refer exclusively to a bad draft). The chimney can be made of masonry or metallic pipe
compound.
It is necessary to comply with the following requirements for the proper operation of the stove:
• The interior section must be perfectly circular.
• It must be thermally insulated along its entire length in order to
prevent condensation (the smoke is liquefied by heat shock) and
even more if the installation is outside the house.
• If we use metallic pipe for the installation outside the house, it
is compulsory to use thermal insulated pipe. It consist of two
concentric pipes and, between them, there is a thermal insulator.
Moreover, we will avoid condensation problems.
• It should be constant through the length (don't use enlargements
or reductions) and it must be vertical with deviations not higher that
45º. It is recommended to install at least 4 meters length.
• Do not use horizontal sections.
• If it has been used previously, it must be clean.
• Respect the technical data of the instructions manual.
** For the fitter
The optimum draft for the stoves varies between 12+/-2 Pa (1.0–1.4 mm water column). We recommend checking the technical information of
the product.
A lower value causes a bad combustion causing carbonic deposits and excessive smoke generation, having leaks and, even worse, an
increase of the temperature that could damage the structural components of the stove, while a higher value leads to a too rapid combustion
with the heat dispersion through the flue.
Materials that are prohibited for the chimney and, therefore, damage the proper functioning of the equipment are: fibre cement, galvanized
steel (at least in the first few meters) and rough and porous interior surfaces. Image attached shows some examples of solution.
All stoves that send smoke to the exterior should have their own chimney.
Never use the same chimney for several equipments at the same time.
The minimum diameter must be 4 dm2 (for example, 20 x 20 cm) for stoves with a diameter below 200 mm or 6.25 dm2 (for
example, 25 x 25 cm) for equipments with a diameter higher than 200 mm.
A big section of the chimney (for example, diameter of the pipe superior to the one recommended) may results in a volume
too large to be heated and, therefore, it can cause difficulties for the proper operation of the equipment. In order to avoid this problem,
it is necessary to enclose the chimney in its entire length. However, a small section (for example, diameter of the pipe inferior to the one
recommended) may cause a reduction of the draft.
INSTALLATION, OPERATING AND SERVICING INSTRUCTIONS
(1) Stainless steel AISI 316 chimney with double insulated
chamber and material resistant up to 400°C. Efficiency
100% optimum.
(2) Traditional clay chimney with square section and
holes. Efficiency 80% optimum.
(3) Chimney with refractory material and double
insulated chamber and exterior coating made of
lightweight concrete. Efficiency 100% optimum.
(4) Avoid chimneys with rectangular interior section
different to the one of the drawing. Efficiency 40% poor.
Not recommended
28 CAROL-MIXTA