38
burn away faster (with more flames). This will help to stabilise the chimney
draught To avoid resistance in the firebed, it should be carefully raked at
frequent intervals to remove the ash. The air supply can be reduced slightly
(middle position B) when the chimney draught has stabilised.
5. FUEL
Stoves may only be operated using fuels that correspond to the 1st BlmSchV
regulations. Only firewood (recommended residual moisture 20% or less) or
wood pellets according to DIN 51731 are permissible for use in stoves
Incidentally: A measuring device for determining the moisture of firewood does
not cost very much and quickly pays off.
Do not use any other fuels!
It follows from this that it is not permitted to burn:
• Varnished or plastic-coated wood
• Chipboard or wood that has been treated with wood preservatives
• Wood originating from Europool palettes
• Rubbish, household waste, old clothes
• Paper, paper briquettes, cardboard
• Coal, coal briquettes, brown coal
• Damp wood (residual humidity > 20%)
• Plastics / foam material of any sort
• Any solid or liquid materials that contain no wood
It is prohibited to burn these or other inappropriate materials in your stove.
When burning other materials than the permitted fuels, firewood or wood bri-
quettes defined in DIN 51713, toxic gases can be formed that have an adverse
effect on the combustion process, and that may even cause explosions.
Room heating capacity* of ambiente stoves when used intermittently
Heating
conditions
a1/a2/a3/a4/
RLU
a4 H
2
O*/RLU
a5
a6
a6 H
2
O*
(7.0kW)
a6 H
2
O*
(11.0kW)
a7/a8
favourable
144 m
3
43 m
3
186 m
3
165 m
3
56 m
3
88 m
3
88 m
3
*
Considerably bigger rooms can be heated with modern thermal insulation.
Direct room heating not including water heating
Precise descriptions of the terms 'favourable', 'less favourable' and 'unfa-
vourable' can be found in DIN 18893. Simply put, ‘favourable’ describes a
situation where the room has only one external wall and otherwise mainly
adjoins heated internal rooms, whereas ‘unfavourable’ refers to a room with
two external walls and adjoining unheated rooms.
The values indicated above refer to structures pre-dating the 1977 ther-
mal insulation standard. They represent a simplification which is valid for
room sizes up to 200 m³. DIN 18893 standard recommended a calcula-
tion according to DIN 4701 for rooms larger than 200 m³. Nowadays, an
estimate according to TR-OL is preferable or, in particular, the calculation
should be based on DIN 12831.
4.6 HEATING IN THE TRANSITIONAL PERIOD / UNFA-
VOURABLE WEATHER CONDITIONS
In the transitional period, when the outside temperature is above approx.
15°C, or during unfavourable weather conditions (down winds, etc.), disrup-
tion to the chimney draught may occur due to sudden rises in temperature,
with the result that the flue gases are not completely extracted. In these
circumstances a smaller amount of fuel should be placed in the stove and
the air adjustment lever should be moved to the maximum position (see „4.2
Combustion air regulation“ on page 35). The fuel in the stove will then
Chapters 4/5
