Emptying The Ash Drawer; The Combustion Process; Drying Phase; Degasifi Cation Phase - HASE Luno Mode D'emploi

Heating with Wood at Low Thermal Output
Procedure Position of
Control Elements
Close primary air. Set primary air slider (I),
all the way to the right.
Adjust secondary air. Set secondary air slider (II)
all the way to the left.
Close fi re grate.
Push in fi re grate slider.
Add one log (weighing
approx. 1 kg total) into the
middle of the fi re box.
Tab. 4
Heating with Briquettes at Low Thermal Output
Procedure Position of
Control Elements
Place 2 briquettes
on the fi re grate.
Open fi re grate. Pull out fi re grate slider.
Adjust primary air. Open primary air slider (I) to 2/3.
Adjust secondary air. Half open secondary air slider [II].
Tab. 5

18. Emptying the Ash Drawer

As a safety precaution, please make sure to wait until the
ashes are cold before you dispose of them. While the ash
collects during the fi re, the lid is located under the ash drawer.
Remove both the ash drawer and the lid located underneath
it. Slide the lid onto the ash drawer so that it is closed; this pre-
vents ashes from fl ying around, which in turn means
your home stays clean. To place the ash drawer back
into the stove, proceed in the reverse order.
CAUTION!
Piled up ashes can impair or even block the
supply of primary air supply to the stove.
Please ensure that the air supply path for the
primary air between the ash drawer and the
bottom of the ash compartment remains clear.

19. The Combustion Process

EA piece of wood burns in three phases. In a wood fi re,
however, these processes occur both consecutively and
simultaneously.

19.1 Drying Phase

The moisture still remaining in the air-dried wood (approx.
15 - 20%) is evaporated. This takes place at temperatures of
approx. 100°C. For the evaporation to occur, the wood must
be supplied with heat during the warming up phase; this is
achieved by using small wood logs.
19.2 Degasifi cation Phase
At temperatures between 100°C and 150°C, the contents of
the wood start - slowly at fi rst – to disintegrate and gasify and
the wood begins its thermal decomposition. At tempera-
tures above 150°C, the gas development accelerates. The
proportion of volatile components makes up around 80%
of the wood substance. The actual combustion begins at a
temperature of about 225°C (ignition temperature) with the
ignition of the resultant gases and the release of heat. There
must be an adequate supply of oxygen available for this
purpose. The peak of the combustion process is reached at
approx. 300°C. The reaction process is now so rapid that the
largest amount of heat is released at this point; fl ames can
reach temperatures of up to 1100°C.

19.3 Burn-off Phase

Glowing charcoal embers remain after the volatile compon-
ents have been burned off. These burn slowly, almost without
fl ames, at a temperature of approx. 800°C.
Crucial to a clean and effi cient combustion process is a
complete as possible chemical
reaction of the wood gases with the oxygen in the combustion
air. In your Hase stove, the combustion air is pre-heated and
guided into the fi re box via wide air inlet openings, so that at
high temperatures, there is a good, thorough mixing of the
gases with the air. An important variable in any combustion
phase is the amount of combustion air. Too little air leads
to an oxygen defi ciency and incomplete combustion, while
too much air reduces the fi re box temperature and thus the
effi ciency. Incomplete combustion can generate air pollutants
such as dust, carbon monoxide, and hydrocarbons.
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