14
HEATING BOILERS
: Astra G-18 E, Astra G-25 E, Astra G-32 E, Astra G- 40 E
The connection of other devices to the chimney to which the boiler is connected is prohibited.
The chimney should be cleaned at least once a year!
6. fUel
The boiler is fired only by wood logs and wood briquettes. It is possible to fire it with fuel peat briquettes, however the operation
of the boiler becomes less comfortable for the user as it is necessary to remove the ashes of these highly ash-producing briquettes
after each loading. The ceramic elements of the lower chamber can be damaged if they are removed every day when cleaning,
thus their lifetime will be shorter. Therefore, we recommend usage of fuel peat briquettes only in rare, exceptional cases.
It is recommended to fire dry firewood with a moisture content of 12-20 %. The drier the firewood, the larger its calorific capacity.
When the moisture content of the firewood is 20%, the heat potential of 1 kg is approximately 4 kWh; when the moisture
content is 50%, its heat potential is reduced by half.
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fig. 8 Positioning of a chimney in respect to vicinity objects
be no less than the external diameter of the smoke exhaust pipe of the boiler. The chimney liner can be round or oval. It is not
recommended to use rectangular-shaped liner as, due to the temperature fluctuations, its walls deform, gaps appear at the
element junction points, through which the condensate falls on the walls of the bricks chimney. Additional air is sucked in, which
reduces draught of the chimney. Draught for each boiler model should correspond to the referred value of draught in the table
“Technical data”. The liner should be factory made. Minimum permissible height of the chimney should be at least 6m. The top
of the chimney should be above the ridge at least by 0.5m. If the chimney is further from the ridge than 1m, the angle horizon-
the ridge- the cap of the chimney should consist 10° or less degrees. Draught of the chimney can also be negatively affected by
various obstructions near the building: trees, hills, other buildings. Fig. 8 presents the recommended minimal angles between the
chimney, nearby objects and the horizon. Angles larger than those indicated will cause reduction of draught of the chimney.
