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Operation and maintenance manual - EN
EN
www.atmos.eu EN-13
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 unacceptab-
le 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.
1. Chimney
2. Flue gas duct
3. Boiler
4. A45 burner
5. External conveyor
6. Bin (500 l)
6. Chimneyn
A boiler with a burner must always be connected to the chimney vent with consent of the re-
sponsible 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 specifi-
cations 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 x 15cm 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 va-
cuum of 2 Pa in the combustion chamber of the boiler.
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