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Contura C 500 Manual

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Choice of fuel
All types of wood such as birch, beech, oak, elm, ash, softwoods
and wood from fruit-trees can be used as fuel in the stove.
Different types of wood have different densities. The denser
the wood, the greater the energy value. Beech, oak and birch,
for example, are all very dense.
Fresh wood comprises 50% water, some of which circulates
freely between the fibres, while the remainder is stored in
the cells. Wood should always be allowed to dry so that the
freely circulating moisture evaporates. Wood is not suitable
for burning until the moisture content has fallen below 20%.
Burning wood with a higher moisture content means that a
great deal of energy is used to boil away the water. Damp wood
also burns poorly, leaving deposits of soot and tar on the lining
of the chimney. In severe cases it can even cause chimney
fires. In addition it makes the glass on the stove sooty and
causes inconvenience to people in neighbouring houses.
To ensure that the wood you use is dry, fell timber in the winter
and store it over the summer, well ventilated and under cover.
Never cover your wood pile with a tarpaulin that reaches to
the ground, This simply seals in the moisture and prevents the
wood from drying out.
Keep firewood indoors for a few days before you use it. That
way any surface moisture will evaporate.
You can easily check the moisture content of wood by weighing
a small sample piece before and after it has been dried in an
oven at 80°C for 24 hours. Then calculate the moisture content
by dividing the weight of evaporated water by the total initial
weight of the piece of wood (in other words, wood + water
content).
Moisture content %:
Important.
Under no circumstances whatsoever may fossil fuels, pres-
sure impregnated wood, painted or glued wood, chipboard,
plastic or colour brochures be used as fuel. When burned,
all of these release hydrochloric acid or heavy metals which
are hazardous to the environment and damage your stove.
Hydrochloric acid can also corrode the steel in the chimney
and cause brickwork to crumble and decay.
For good combustion, it is important to ensure that the wood
you use is of the correct size:
Kindling wood: fine-split logs
Length: 25 - 33 cm
Diameter: 2 – 5 cm
Amount: 2,2 kg (approx. 8–10 fine-split logs)
Wood: split logs
Length: 25 – 33 cm
Diameter: 7 – 9 cm
Normal amount: 1,7 kg/hr
Max. amount: 2,5 kg/hr (Re-stoke with max. 3 logs at a time)
Normal refueling interval: 50 minutes
Lighting the fire
It is important to use the right amount of wood, especially
when first kindling the fire. Before lighting the fire for the first
time, weigh the wood on kitchen scales to get an idea of how
much 2.2 kg of kindling wood is. Check, too, to see how much
the “normal” and “maximum” amounts are.
The stove is designed to be used with the door closed. Always
open the door slowly and carefully to prevent the sudden
change of pressure in the fire-box from blowing smoke into the
room.
A stove reacts in different ways depending on the draught in
the chimney. You will normally need to light a fire and use the
stove for a few times before you arrive at the optimum setting
for the air supply control, the right size for the logs and the
correct amount of wood to use.
Starting the fire
Important!
Please note that if too little wood is used when lighting
the fire, or if the pieces of wood are too large, it will not be
possible to attain the optimum working temperature in the
fire-box. This can result in poor combustion and may lead to
a heavy build-up of soot, or cause the fire to die out when
the door is closed.
If the house has mechanical ventilation and there is negative
pressure indoors, open a window near to the stove before
lighting a fire. Leave the window open for a few minutes until
the fire is blazing.
To get a good bed of glowing embers quickly, there should
always be a thin layer of ash and carbonised wood in the stove.
IMPORTANT!
The handle on the left which controls the grate disc should
be in the closed position when the fire is burning.
1. Open the air supply control fully.
2. Place screwed-up balls of newspaper or a firelighter in the
middle of the fire-box and stack about 2.2 kg of finely split
wood on top in a criss-cross pattern.
3. Light the fire.
4. Leave the door slightly ajar for a while, with the lower latch
just engaging on the latch-pin. After about 5 or 10 minutes,
once the fire is burning well, close the door. (See illustration
below.)
5. Before the flames die, stoke the fire with 2 or 3 logs that
together weigh 1,7–2,5 kg. After about 5 minutes when the
logs have caught fire properly, you can reduce the supply of
combustion air.
m
before
-m
after
m
before
x 100
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