In case of hermetically closing doors and windows (eg. houses built adhering to energy efficiency
criteria), the ventilation and air circulation might not be guaranteed, endagering thus people's well-being and
safety. It is necessary to ensure air input into the room where the furnace is. This can be done through the
external air hole and the required air volume to be provided is up to 20m3/h. The air entry spot has to be
protected by net or shutter.
Aspirator mounted in the room generates depression with the exhaust combustion gases (smoke,
odour). It is therefore necessary to enable better circulation of the fresh air.
Depression in the aspirator may suck in the smoke which would have adverse consequences
to human health.
13. PERMITTED/PROHIBITED FUEL
As permitted fuel are regarded chopped wood, wooden and anthracite coal briquettes. Wooden fuel
must be asolutely dry (max. content of moisture to be 20%). In the firebox may be put maximum 2 or 3
pieces of wood at once, whose length should be 25-35 cm and max. circumference 25-30 cm.
Wet wood makes firing harder as more energy is required for vaporization of water contained in
wood. Presence of moisture is disadvanategous because as the temperature goes down, the water
condensates first in furnace hearth, then in the chimney. Among others, following materials must not be
fired: coal rests, bark rests, wet or lacquered wood, plastic materials, materials of organic origin;
otherwise the product warranty shall not apply.
Paper and cardboard may only be used to put regular fuel on fire.
Burning of waste materials is FORBIDDEN as this could damage both furnace and chimney,
cause health damage or unpleasant smell.
The wood is not a fuel which enables uninterrupted furnace operation, therefore heating all over the
night is not feasible.
ATTENTION: continuous usage of aromatic firewood impairs furnace's cast iron parts.
14. FIRING
At first furnace usage specific odour will be felt as a result of protective paint stabilization. Provide for
sufficient room ventilation. At the very first firing usage of smaller firewood quantity and gradual temperature
raise are recommended.
Over the course of firing following issues are to be monitored:
1. Check whether there is enough air flow in the room where the furnace is placed.
2. Do not overload the firebox during the first few firings (put not less than half of the wood volume
stated in the manual) and keep fire for 6-10 hours uninterruptedly. Regulators must be opened lesser than
prescribed in the manual.
3. Repeat this operation 4-5 or more times.
4. Later you can increase the fuel volume (in accordance with the maximum load from the manual)
and keep fire for a longer period.
5. During the initial firings do not put any objects on furnace nor bring them in contact with its painted
areas.