Reduced Burning; Risk Of Explosion - Heta SCAN-LINE 40 Operating Instructions Manual

Lighting
To ignite the fuel, use fire lighters,
small paraffin ignition bags or small
pieces of wood placed on the bottom
grate. Place larger pieces of wood on
top of this kindling material, at right
angles to the firing, doors. Complet-
ely open the secondary air supply and
leave the firing door ajar – i.e. approx.
1 cm open. Once the fire has taken a
good hold of the fuel and the chimney
has heated up (after about 10 min)
close the firing door. We recommend
that you burn the entire first firing
with the secondary air supply fully
open to make sure that the chimney is
thoroughly heated.
Refiring
You should normally refire the stove
while there is still a good layer of
embers. Distribute the embers across
the bottom grate, place pieces of
fuel (max. 2 kg) on the embers in a
single layer perpendicular to the firing
opening. Close the firing door and
fully open the start-up mechanism.
The wood will then ignite very quickly
– i.e. in 30 seconds or 1 minute. When
the wood is burning with a steady
flame, close the start-up mechanism.
Then adjust the secondary airflow to
the level required. For nominal opera-
tion (5 kW), the secondary air supply
should be 70% open. When firing,
take care not to place the pieces of
fuel too close-ly together, as this will
result in poor combustion and insuf-
ficient exploitation of the fuel.

Reduced burning

The stove is well-suited to intermit-
tent use. If you wish to operate the
stove with reduced out-put, simply
insert smaller volumes of wood at
each firing, and apply a lower airflow.
However, remember that the second-
ary combustion air supply must never
be shut off completely during firing.
It is important to keep a good bed of
embers. Gentle heat is released when
the fire settles - i.e. when the wood no
longer generates flames and has been
converted to glowing embers.
Optimal firing
To achieve optimal firing and the
highest possible effect, it is important
to make sure that the air supply is
used correctly. As a general rule, the
secondary air is to be used to control
the fire to ignite the flue gases. This
produces a high effect and keeps the
glass panel completely clear of soot
as the secondary air "washes" down
over it. Please note that the stove will,
naturally, produce soot if both the
start-up mechanism and secondary
air intakes are closed completely.
This will prevent oxygen from being
drawn into the stove, and the viewing
window and other parts will become
covered with soot. If this situation is
combined with firing with wet wood,
the build-up of soot can become so
thick and sticky that the sealing rope
can, for example, become detached
when the door is opened the next day.

Risk of explosion

After you add new fuel, it is
very important that you do
not leave the stove unatten
ded until the wood is burning
constantly. This will normally occur
within 30 to 60 seconds.
A risk of explosion can possibly arise if
too much wood is placed in the stove.
This may result in the production of
large volumes of gas, and this gas can
explode if the intake of primary and
secondary air is insufficient.
It is an advantage always to leave
some ash lying in the bottom of the
comb-
stion chamber.
Take care when emptying the ash pan,
as cinders can continue to burn in the
ash for long periods of time.
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