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Figure 4. Dimensioning of the chimney for Polifuel
3.0. CONNECTION TO THE CHIMNEY
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Wood pellets
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The chimney must be resistant against flue condensate!
IProperly dimensioned and built chimney is the main condition for safe and economical
functioning of the boiler. The thermal insulation of the chimney has to be done properly, it has
to be absolutely gas-proof and smooth. On its lower part there has to be built in the opening for
cleaning with the door. An brick-layed chimney has to have three layers with an insulation of 30 mm
in the middle, if the chimney is built inside the house (i.e. inside the heated area), or an insulation of
50 mm if it is built outside the house (i.e. outside the heated area). The flue gas temperature has to
be at least 30°C higher then the temprerature of their consdensation point. The choice and the
construction of the chimney has to be performed by the authorized person. Inside dimensions of the
chimney intersection selected in accordance with diagram for chimney selection, they depend of its
height and of the capacity of the boiler.
Chimney must be dimenensioned by "diagram for chimney selection" and maximum permetted
lenght of connection flue gas tube between connection on fan and chimney is 2000 mm and
minimum light diameter xx0 mm with maximum two 90° bends. Connection flue gas tube can be
mounted horizontally or at any angle which allows to gas, on his way to chimney, a constant
increase of height with condidering of exit point from fan. Connection flue gas tube must have
openings for cleaning through which is possible to clean entire lenght of flue gas tube or must
ensure easy removal part of flue gas tube which allow complete cleaning of connection flue gas
tube. To prevent entry of condensate form chimney into the boiler, flue gas tube must be mounted
10 mm deeper into the chimney. Connection flue gas tube between fan and chimney must be
insulated with 30-50 mm mineral wool.
Connection to the chimney
Useful height of the chimney (m)
Rated thermal output of the boiler (kW)
Chimney light diameter (cm)
Chimney dimensioning example:
for boiler Polifuel 36
Boiler heat output: 36 kW
Fuel: wood pellets
Required usable chimney height: 7 m
Required chimney light
diameter: 20 cm
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Technical instructions Polifuel
17


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