Operating Problems Related To Draught Defects In The Chimney - RED LOGIKA 25-35 Installation Manual

2-INSTALLATION INSTRUCTIONS

OPERATING PROBLEMS RELATED TO DRAUGHT DEFECTS IN THE CHIMNEY

Of all the weather and geographical conditions which affect the operation of a flue pipe (rain, fog, snow, altitude a.s.l., exposure to
sunlight, direction of facing), the wind is unquestionably the most decisive. In fact, along with thermal depression caused by the difference
in temperature inside and outside of the chimney, there is another type of depression or over-pressure: dynamic pressure caused by the
wind. An updraft always increases depression and therefore the draught. A horizontal wind increases depression provided the chimneypot
has been installed properly. A downdraft always decreases depression, at times inverting it.
Besides the direction and force of the wind, the position of the chimney and the chimneypot with respect to the roof of the building and
the surrounding landscape is also important.
The wind also influences the operation of the chimney indirectly by creating high-pressure and low-pressure zones, not only outside the
building but inside as well. An internal overpressure can be created in rooms that are directly exposed to the wind (2), which can enhance
the draught in the boiler, however, it can be counteracted by the external overpressure if the chimneypot is situated on the side exposed to
the wind (1). On the other hand, a dynamic depression can be created in rooms that are opposite the wind direction (3), which competes
with the natural thermal depression generated by the chimney, however, this can be compensated for (sometimes) by placing the smoke
duct opposite the wind direction (4).
IMPORTANT!
The operation of the product is significantly affected by the flue layout and position.
Hazardous conditions can only be resolved by qualified personnel setting the product appropriately.
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A
WIND
1
2
B
A=LESS FAVOURABLE POINTS
B=MOST FAVOURABLE POINT
4
3
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