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Operation and Maintenance Manual - EN
5. 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 supply 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 cm2 for boilers with an output of
5 - 45 kW.
6. 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, output 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
15 x15cm 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.
CAUTION - The draught of the chimney during operation must ensure the minimum
vacuum of 2 Pa in the combustion chamber of the boiler.
1. Chimney
2. Flue gas duct
3. Boiler
4. A25 burner
5. External conveyor
6. Bin (500 l)
12


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