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The wood must never be placed higher than the
tertiary air holes (Fig. 6.4 "A") at the rear of the
combustion chamber.
6.5 COMBUSTION CONTROL
When combustion chamber and flue pipe
reach the operating temperature it is possible
to adjust the air to achieve the maximum
efficiency. The combustion speed, therefore the
generated thermal power, is controlled by both
the amount of wood in the combustion chamber
and the amount of air. An excessively high flame
makes the wood last less and lowers the stove's
efficiency.
Maximum performance is achieved by loading
and adjusting the stove as in the tests: 2 logs of
30 cm wood with a total weight of 1.83 kg and the
valve set for about 50% of air.
To decrease power, move the air lever slightly to
the left.
Combustion is efficient and clean when the
flame is light yellow. If the flame is tinged with
red or if there is black smoke in the combustion
chamber, it is probably necessary to increase the
air slightly.
An initial period of use is required to understand
how to correctly control combustion.
6.6 LOADING IN THE FUEL
Feed the stove frequently, adding only small
amounts of fuel at a time. If the stove is too full,
the heat created could cause extreme stress on
the flue pipe. Add fuel to the fire in moderation.
Avoid fires that burn without flames, as this will
produce maximum pollution. An optimal fire
78
Fig. 6.3
A
Fig. 6.4
is achieved with a good burn and an almost
invisible smoke coming out of the flue pipe.
It is recommended that no less than 2 pieces of
wood be supplied with each refuelling.
Do not operate the stove with the door open
unless you are reloading wood.
6.7 RISK OF OVERHEATING
The stove must never be operated in such a way
as to cause overheating.
Overheating occurs in the presence of excess fuel
and/or air, causing excessive heat.
An obvious sign of overheating is the presence
of a red glow in some parts of the stove. If this
happens, immediately reduce the air intake
opening.
Consult a professional if you suspect that the flue
pipe does not have a proper draught (excessive
or poor draught).
6.8 USING THE STOVE IN DIFFERENT
WEATHER CONDITIONS
6.8.1 Wind
The wind blowing up the flue pipe can have a
great effect on combustion; it may be necessary
to adjust the air flow to achieve good combustion
results. Installing a damper in the flue pipe can
also help, as it will give you the possibility to
adjust the draught in variable wind conditions.
6.8.2 Fog
Fog can also have a great influence on the
draught capacity of a flue pipe; it may be
necessary to adjust the airflow settings to achieve
good combustion results.
6.8.3 Condensation
Condensation may occur in the combustion
chamber / pipes / flue pipe. This depends on
the humidity of the wood or differences in
temperature in the combustion chamber or
environment.
Condensation in the combustion chamber
appears as a black liquid. This must be removed
to avoid damage to the colouring of the product,
floor or wall coating.
This is why a fast switching on phase that limits
the production of condensate is important.
If the influx of condensate continues, mineral sand
can be used at the bottom of the combustion
chamber.
6.8.4 Flue pipe
The flue pipe is the engine that drives the stove
and it is essential to have a good flue pipe for it to
function properly.
The draught in the flue pipe creates a vacuum in
the stove. This vacuum extracts smoke from the
stove and draws air through the flame guard to
feed the combustion process.
The combustion air is also used for the cleaning
system that keeps the glass of the combustion
chamber clean.
The draught is generated by the temperature
difference inside and outside the flue pipe.
The greater the temperature difference, the better
the draught. It is therefore important to allow the
flue pipe to reach operating temperature before
adjusting the air intakes to limit the stove's
combustion (a masonry flue pipe takes longer
to reach operating temperature than a steel flue
pipe).
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