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HEATING BOILERS: Astra G-50E, Astra G-80E
Type of boiler
astra G-50e
astra G-80e
length of firewood, mm
750
750
The recommended thickness of the wood logs is 100-200mm. Thicker pieces of firewood should be split at least once. Up to
15% of the fuel load can consist of fine wooden splinters and sawdust. However, they must be loaded in such a way so as not
to block the opening of the ceramic burner 22 (Fig. 1) connecting the upper and lower chambers of the boiler.
Do not fire freshly prepared and excessively damp pieces of firewood. The operation of the boiler
becomes inefficient, deposits of resin emerge on its inside walls as well as excessive condensate. corrosion of
the boiler takes place several times faster when firing it with freshly prepared wood or wood that has been
dried outside for several months only!
Recommendations for firewood preparation:
• put split wood in a properly-ventilated place – if possible, in a sunlit place;
fig. 8 Positioning of a chimney in respect to vicinity objects
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.
The length of the firewood should be at least 5cm shorter than the length of the boiler combustion chamber.
