Nibe Contura Ci51 User manual

Ci50 / Ci51
contura.eu
Operation
instructions

GB
66
Lighting Instructions
Kindling:
Finely chopped wood
Length: 25-35 cm
Diameter: 3-5 cm
Weight per lighting: 2.3 kg
(approx. 10-12 finely chopped pieces)
The damper
This insert has a supply air damper that can be closed completely, position
”-”. The damper must be in this position for periods when the insert is not
used. This prevents air from flowing through the chimney when the stove
is not in use, which considerably reduces the risk of condensation and
of hot room air escaping through the chimney. During lighting however,
the damper must not be in this position because the air supply is shut
off completely. It is also strictly forbidden to try to extinguish the stove
by closing the damper. Make sure all embers have burned out before the
damper is set to position ”–”.
Note that if too little kindling is used when lighting, or if the wood is too
thickly cut, the firebox will not reach the correct operating temperature.
Incorrect lighting can lead to poor combustion with heavy sooting and may
result in the fire going out when the door is shut.
If the house has mechanical ventilation, it may be necessary to open a
window near to the fireplace prior to lighting. Leave the window open for a
few minutes until the fire has caught properly.
1. Open the damper completely to max.
2. Use 10-12 pieces of varying sizes of kindling, weighing about 2.3 kg
together, to get the fire started. Prepare the fire by stacking the
kindling in a criss-cross pattern. Start with the largest pieces at the
bottom and finish with the smallest kindling on the top. Place the
firelighter in the centre.
3. Light the fire and close the door completely.
Lighting
Lighting in the right way
It is important that the correct amount of wood is used, especially when
lighting. If you are lighting the fire for the first time you should use a set
of scales to see how much 2.3 kg kindling is. Also check what the normal
and maximum weights look like. Follow the kindling procedure below, after
which the insert must be burnt with the door closed because of the risk
of smoke entering the room. Always open the door carefully and slowly
to prevent blow back because of the changing pressure in the stove. The
function of the insert differs depending on the draft conditions in the
chimney. Achieving the correct setting for the combustion air damper
usually takes a few attempts.

GB
67
Lighting Instructions
Feeding Wood:
Split logs
Length: 25-50 cm
Diameter: 6-9 cm
Normal weight: 2.5 kg/hour
Max amount: 3.5 kg/hour
(max 3 pieces per load. Max 3 kg per insertion).
Following loads
First and second load
Adding wood
The first load of logs after lighting should not be put on until the start-up
fire has turned to embers and no yellow flames are visible. At the first and
second loads of wood after lighting, it is recommended to use 3 pieces
of wood to build up a proper glowing bed of embers and get the stove to
operating temperature. When a proper glowing bed of embers is achieved,
you can continue to add 2 pieces of wood at a time.
1. Open the door.
2. Insert one piece of wood diagonally on the bottom and place the
remaining logs on top.
3. The damper must be completely open until the logs turn black and catch
fire. This can take about 3- 5 min. The damper can then be closed. The
conditions for controlling combustion vary depending on the firebox
temperature, the moisture content of the wood and the draft in the
chimney.
4. A nominal output of 8 kW is obtained when the combustion air damper
is at 2 dots. 2 logs with a combined weight of 2 kg can be added at the
same time every 50 minutes.
5. The lowest output is obtained when the combustion air damper is at 1
dot and 2 logs are lit. In this operating position, it is important that the
combustion air damper is fully open for the first 3-5 minutes so that
the wood has time to burn properly before the supply of combustion
air is reduced. A condition for regulating the output is a thick bed of
embers and high temperature in the firebox. When the fire has died
down to embers, and no yellow flames are visible, more wood should be
added.

GB
68
Lighting Instructions
QUICK LIGHTING
It is important that the wood catches fire quickly. Quick lighting is achieved by opening the combustion air damper
fully for a moment. Smoulder combustion produces a lot of smoke and, in the worst instance, can cause quick gas
ignition resulting in damage to the insert.
The insert will emit an odour of excess paint and oil coating that
may remain on the panels. The odour will disappear completely after
several fires.
LIGHTING FOR THE FIRST TIME

!
GB
69
Lighting Instructions
Under no circumstances may fossil fuels, pressure impregnated wood,
painted or glued wood, chipboard, plastic or colour brochures be used as
fuel. All these materials can create hydrochloric acid and heavy metals
that are damaging both to the environment and the hearth. Hydrochloric
acid can also attack the steel in the chimney or the mortar in a stone
built chimney. Also avoid using bark, woodchips or other extremely finely
chopped wood except for lighting. Fuel of this type causes flashover
resulting in too high output.
Candles
Do not use old candle stubs as fuel. Melted wax runs down into the stove’s
damper system and makes the stove unusable. Repairs for this are very
expensive.
Choosing fuel
All types of wood, such as birch, beech, oak, elm, ash, conifers and fruit
trees can be used as fuel in the insert. Different types of trees have
different densities, the greater the density of the wood the greater the
energy value. Oak, beech and birch have the highest density.
The wood’s moisture content
Fresh wood is about 50 per cent water. Some of the water circulates freely
between the fibres and some of the water is bound in the cells. The wood
must always be dried so that the free water evaporates. The timber is
ready for use when the moisture content has fallen below 20 %. If wood
with a higher moisture content is lit, a large part of the energy content of
the wood is used boiling off the water. If the wood is damp, the combustion
is also poor, layers of soot and tar build up in the chimney and could,
at worst, lead to a chimney fire. In addition, it causes the glass of the
insert to soot and may cause discomfort to those living nearby. To ensure
thoroughly dry wood, the wood should be cut in the winter and stored, well
aired, under a roof.
Never cover the woodpile with a tarpaulin to the ground. The tarpaulin will
then act as a sealed cover and the wood will be prevented from drying.
Always store a small amount of wood indoors for several days before use,
so that the surface moisture has time to evaporate.
Do NOT burn the following
NOT TOO BIG FIRES
The firebox in your insert is relatively large. This is so that boiler
wood can be burned. It is, however, prohibited to load it full of wood.
Adding more logs than recommended leads to flashover with oxygen
deficiency, which results in: Sooted glass, too high an energy output
that can damage the inserts/surround, thick smoke and high flue gas
temperatures that can damage the chimney. Recommended amount of
wood for normal lighting is 2.5 kg/hour and the maximum permitted
amount of wood is 3.5 kg/hour, max 3 kg of wood per insertion and covers
lighting with a maximum of 2 pieces of chopped birchwood or other
broad leaf wood with a moisture content of about 18% per load. When
lighting with the same wood amounts as above but with, for example,
conifer wood, higher firebox temperatures are achieved. The service life
of the insert can be cut short if the fire is left at full combustion for long
periods, and if the maximum permitted amount of wood is exceeded,
parts in the insert can become damaged thus invalidating the warranty.