INSTALLATION, OPERATION AND MAINTENANCE MANUAL
Bisolid Automat OM-BAV05/02/2018/EN
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extractor components should be made of non-combustible materials. Flue pipes for solid fuels
are very well adjusted pipes, which are installed in the same direction as the flue gases.
9.7. BOILER CONNECTION TO THE CHIMNEY
Bisolid Automat series boilers in central heating systems should be connected mandatory to a
separate chimney with appropriate chimney draft, which is a main precondition for optimum
operation of the boiler.
The chimney draft affects boiler thermal power, its performance and lifetime. The chimney
draft depends on chimney cross-section, height and roughness of the inner wall, and
furthermore on the difference between the flue gas temperature and the outside temperature.
The most suitable chimneys are the insulated chimneys and those with a chimney insert. The
actual draft can be measured by an authorized installation and service company using a
special gas analyzer.
The smoke extractor between the boiler and chimney should be insulated with mineral glass
wool. The smoke extractor and chimney must be made of steel or equivalent material that can
be used at temperatures around 400 °C.
All system connections for the flue gases must be solid and reliable to perform better
combustion and achieve high efficiency. The smoke extractor need to be connected to the
chimney using the shortest way and in the amounts indicated in Figure 26. The horizontal links
and elements that increase the pressure loss such as elbows should be avoided. Should not
be used as a single vertical stack steel tube. The chimney must be made of an inner and an
outer surface. The outer surface can be made of steel or brick. On the inner surface of
chimneys is recommend to use elements of stainless steel to prevent corrosion. The space
between the inner and outer surfaces of the chimney should be insulated to prevent
condensation of the flue gases.
At the lowest level of the chimney, there must be a hole with lid for cleaning, which is
necessary to be made of steel.
These dimensions in Figure 26 are indicative only. The working
installation depends on the diameter, height, roughness of the wall of the
chimney, temperature difference between the combustion products and the
external air temperature. We recommend using of a chimney built-in metal
insert.
