15
INSTALLATION AND OPERATION MANUAL
The length of the firewood should be at least 5cm shorter than the length of the boiler combustion chamber.
Type of boiler
astra G-18e
astra G-25e
astra G-32e
astra G-40e
length of firewood, mm
310
500
500
550
The recommended thickness of the wood logs is 100-150mm. 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;
• firewood should be well sheltered from rain and snow;
• pieces of split wood should be stacked with sufficient gaps between them so that the freely-circulating air can blow away
the moisture evaporated from the pieces of firewood;
• there should be sufficient space above the heap of firewood below the roof and sufficient ventilation to remove the moist air;
• it is not advisable to store freshly-cut firewood in a basement since the firewood needs sun and free air movement to dry.
Dry wood can be stored in the basement where sufficient ventilation is guaranteed;
• it is recommended to dry the split firewood outdoors under the above-mentioned conditions. Depending on the type of wood,
soft wood (alder, asp, fir, poplar) must be dried for at least 8 months, and hard wood (oak, ash, birch) for at least 20 months.
firing the boiler with coal, rubber or plastics is prohibited. However, loading wood briquettes into the
boiler together with their plastic packaging bags is allowed.
7. oPeRaTIon
• front control Panel
The front control panel has an electronic boiler regulator 1, a green button for switching voltage to the boiler on/off 2 and
a red button for switching on the ventilator 3. These buttons light up in the activated state. For more details on the operation
of the front panel buttons, see “Electronic boiler regulator KR-4.3D” and “Boiler kindling procedure”.
fig. 9 front control panel
1. Electronic boiler regulator; 2. Green button for switching the voltage of the boiler on and off; 3. Red button for switching on the ventilator.
1
2
3
