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12 - GB
Operation Manual - GB
7. Type of environment and location of the boiler with the
burner in the boiler room
Boilers with a pellet burner may be used in the AA5/AB5 basic environment in accordance with
the ČSN3320001 standard. Boilers must be installed in a boiler room with guaranteed sufficient sup-
ply of combustion air. It is unacceptable to locate boilers on residential premises (incl. corridors). The
cross-section of the opening
for supply of combustion air
to the boiler room must be at
least 350 cm
2
for boilers with
an output of 15 - 45 kW.
1. Chimney
2. Flue gas duct
3. Boiler
4. A25 burner
5. External conveyor
6. Bin (500 l)
8. Chimney
A boiler with a burner must always be connected to the chimney vent with consent of the
responsible chimney maintenance company. The chimney vent must always produce sufficient
draught and exhaust flue gas to the free atmosphere in virtually all operation conditions. For proper
function of boiler the separate chimney vent must be properly dimensioned as the combustion, out-
put and service life of the boiler depends on its draught. The draught of a boiler directly depends
on its cross-section, height and roughness of the inner wall. No other device may be connected to the
chimney to which a boiler is connected. The diameter of the chimney must not be smaller than the
outlet on the boiler (min. 150 mm). The chimney draught must achieve prescribed values (see the
technical specifications in the boiler manual). However, the boiler must not be excessively high so as
not to reduce the efficiency of the boiler and not to disturb its combustion (tear the flame). In case of
too strong draught install a throttling flap or draught reducer in the flue gas duct between the boiler
and the chimney.
Guideline values of dimensions of the chimney cross-section:
20 x 20 cm height 7 m
Ø 20 cm height 8 m
15x15cm height 11 m
Ø 16 cm height 12 m
The exact determination of chimney dimensions is defined by the ČSN 73 4201 standard.
The prescribed chimney draught is specified in the “Technical data” chapter of the manual of the
particular boiler.
