Nibe Contura C750 User manual

Eldningsinstruktion 2
Heizinstruktionen 5
Fyringsinstruksjon 8
Instructions d’allumage 11
Lighting Instructions 14
Fyringsvejledning 17
Lämmitysohjeet 20
Istruzioni per l’accensione 23
Stookinstructies 26
C750
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C790
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contura.eu
Lighting
Instructions

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26
Lighting Instructions
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 2.0 kg kindling is. Also check what the normal
and maximum weights look like.
The stove may only be lit with the hatch closed.
Always open the hatch carefully and slowly to prevent blow back because of
the changing pressure in the stove.
The function of the stove differs depending on the draft conditions in the
chimney. Achieving the correct setting for the combustion air damper,
suitable size and amount of wood usually takes a few attempts.
Lighting in the
right way
Correctly sized wood
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 hatch is shut.
Lighting
If the house has mechanical ventilation, open a window near to the
fireplace prior to lighting. Leave the window open for a few minutes until
the fire has caught properly.
Adding wood
1. Open the hatch a few centimetres and allow the vacuum in the firebox to
equalise for a few seconds before opening the hatch fully.
2. Add 2-3 logs of a combined weight of approx 1.2–1.5 kg. Lay the logs
diagonally on each other so that the flame can take easily. Then close
the hatch.
3. The combustion damper must be completely open for 3-5 minutes or
until the logs turn black and catch fire. If slower combustion is then
required, the supply of combustion air can be reduced. The conditions
for controlling combustion vary depending on the temperature in the
firebox and the draft in the chimney.
4. An average energy output of 5 kW is achieved when the combustion air
damper is 40% open and 2 logs weighing about 1.3-1.5 kg are added
once per hour.
5. The lowest output of 3-4 kW is obtained when the combustion air
damper is 30% open. 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 ignite 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 more wood should be added.
Kindling: Finely chopped wood
Length: 25-30 cm
Diameter: 2 - 5 cm
Amount per firing: 2.0 kg
(approx. 10-12 finely chopped pieces)
Feeding Wood: Chopped wood
Length: 25-30 cm
Diameter: 7 - 9 cm
Normal amount: 1.3 kg/hour (2 pieces)
Max amount: 2.4 kg/hour (max 3
pieces per insertion. Max 1.8 kg per insertion)
It is important that the wood catches fire
quickly. Quick lighting is achieved by opening the
combustion air damper fully or by leaving the hatch
ajar for a moment.
Pyre lighting produces a lot of smoke and can cause
quick gas ignition in the worst instance resulting in
hearth damage.
Important!
NOTE!
The left hand handle that controls the grate disc must be closed
during lighting.
1. Open the control for the combustion air fully.
2. Insert paper or firelighters and about 2.0 kg of thinly chopped kindling
into the firebox. Stack the wood crosswise.
3. Light the fire.
4. Set the hatch to the lighting position, that is with the lower hook against
the lock roller to create a sufficient gap (see figure).
5. When the fire has caught fully after approx 5-10 minutes, close the
hatch completely.
6. A slight amount of soot may build up on side glass during the start-up
fire. This is normal and vanishes after a period.
7. A fresh load of logs should not be put on until the start-up fire has
become a glowing bed of embers.

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Lighting Instructions
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 stove 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.
When the stove is new
When new, the stove may emit an odour due to excess paint and oil coating
that may remain on the panels. The odour will disappear completely after
several fires.
Maintaining the stove
The glass may become sooty with use, even if the stove is lit with dry wood
with a moisture content of 15 – 20%. Regular cleaning with dry paper is
usually sufficient to keep it clean. If the soot has been on the glass for a
long time, dip the damp paper into the soft, none abrasive ashes and wipe
clean. Ash and water will remove the soot. This is the only cleaning method
we recommend. Detergents and special soot removes/fireplace glass
cleaner are available from supermarkets, DIY shops and local stove dealer,
we do not recommend these. Never use cleaning agents that contain
abrasives or that have a corrosive effect on printed or painted glass. These
may damage the glass/paintwork. Do not use cleaning products containing
sodium hydroxide because of their corrosive effect on sealing strips.
• When emptying the ash-pan, ensure that there are no glowing embers.
The ash must be stored in a fireproof container with a lid for at least one
week before being disposed of.
• Also clean inside the area where the ash-pan is located, otherwise
spilled ash can prevent the ash-pan from being fully inserted and
prevent the fireplace door from being closed properly.
• The grate and other cast iron components in the firebox can be cleaned
using a wire brush.
• It is important from a combustion point of view to check gaskets, as
worn gaskets hinder combustion when the stove draws “extra air”.
• Painted parts on the stove can be cleaned using a damp cloth, with a
small amount of detergent, if necessary. Damage to painted parts, e.g.
small scratches, can be rectified with Contura touch-up paint. Contact
your dealer.
• As there is a constant large flow of air through the stove, as cold room
air is drawn in and hot air released, dust can collect behind and under
the stove. Therefore, the areas under and behind the stove should be
regularly cleaned.
• Parts located near the actual seat of the fire may require replacing.
Examples of such parts are the hearth surround and grate. The service
life of these parts depends on how much and how the stove is used.
• Only use spare parts recommended by Contura.
Do NOT burn the following
Under no circumstances whatsoever 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.
Not too big fires
Fires should not be too big. Large fires are uneconomical and they give
off high flue gas temperatures that can damage the stove and the
environment. Recommended amount of wood for normal use is 1.3 kg/hour,
with the maximum permitted amount of 2.4 kg/hour and covers lighting
with chopped birch wood or other broad leaf wood with a moisture content
of about 18%. When lighting with the same wood amounts as above
but with, for example, conifer wood, higher fireplace temperatures are
achieved. The service life of the stove 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 stove can become damaged thus annulling
the warranty.
Choosing fuel
All types of wood, such as birch, beech,
oak, elm, ash, conifers and fruit trees can
be used as fuel in the stove. 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.
Hearth plate glass must
be discarded as waste
material together with
pottery and porcelain
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.
Managing waste
The stove packaging is cardboard, wood and a small amount of plastic. The
materials must be sorted and recycled.

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Lighting Instructions
UK Smoke control areas
The Contura 700 series has been recommended as suitable for use in smoke control areas when burning wood logs and operated in accordance with these
instructions and when fitted with a permanent stop to prevent closure of the air control vent beyond the 28% open position when sold into smoke control
areas. The instructions for modifying the air control with the permanent stop (damper blocker) are provided at page 32.
USER OPERATING INSTRUCTIONS
Please read these important notices before referring to the main
instruction for detailed operating instructions.
Stove performance
Refer to the main instruction manual for details of the stove’s
performance.
Recommended fuels:
The stoves have a refuelling interval of 0.75h to achieve the nominal rated
output. Wood logs should be seasoned with a moisture content of around
28%.
Refuelling on to a low fire bed:
If there is insufficient burning material in the firebed to light a new fuel
charge, excessive smoke emission can occur. Refuelling must be carried
out onto a sufficient quantity of glowing embers and ash that the new fuel
charge will ignite in a reasonable period. If there are too few embers in the
fire bed, add suitable kindling to prevent excessive smoke.
Fuel overloading:
The maximum amount of fuel specified in this manual should not be
exceeded, overloading can cause excess smoke.
Air Controls:
To avoid the risk of excess smoke emission the air controls should always be
used as directed in the instructions.
Operation with door left open:
Operation with the door open can cause excess smoke. The appliance must
not be operated with the appliance door left open except as directed in the
instructions.
HEALTH AND SAFETY PRECAUTIONS
Special care must be taken when installing the stove such that the
requirements of the Health and Safety at Work Act are met.
Handling
Adequate facilities must be available for loading, unloading and site
handling.
Fire Cement
Some types of fire cement are caustic and should not be allowed to come
into contact with the skin. In case of contact wash immediately with plenty
of water.
Asbestos
This stove contains no asbestos. If there is a possibility of disturbing any
asbestos in the course of installation then please seek specialist guidance
and use appropriate protective equipment.
Metal Parts
When installing or servicing this stove care should be taken to avoid the
possibility of personal injury.
THE CLEAN AIR ACT 1993 AND SMOKE
CONTROL AREAS
Under the Clean Air Act local authorities may declare the whole or part of
the district of the authority to be a smoke control area. It is an offence to
emit smoke from a chimney of a building, from a furnace or from any fixed
boiler if located in a designated smoke control area. It is also an offence to
acquire an ”unauthorised fuel” for use within a smoke control area unless
it is used in an ”exempt” appliance (”exempted” from the controls which
generally apply in the smoke control area).
In England appliances are exempted by publication on a list by the
Secretary of State in accordance with changes made to sections 20 and 21
of the Clean Air Act 1993 by section 15 of the Deregulation Act 2015.
In Scotland appliances are exempted by publication on a list by Scottish
Ministers under section 50 of the Regulatory Reform (Scotland) Act 2014.
Similarly, in Northern Ireland appliances are exempted by publication on a
list by the Department of Agriculture, Environment and Rural Affairs under
Section 16 of the Environmental Better Regulation Act (Northern Ireland)
2016. In Wales appliances are exempted by regulations made by Welsh
Ministers.
Further information on the requirements of the Clean Air Act can be found
here: https://www.gov.uk/smoke-control-area-rules
Your local authority is responsible for implementing the Clean Air Act 1993
including designation and supervision of smoke control areas and you can
contact them for details of Clean Air Act requirements.

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Lighting Instructions
IMPORTANT WARNING
This stove must not be installed into a chimney that serves any other heating appliance.
There must not be an extractor fan fitted in the same room as the stove as this can cause the stove to emit fumes into the room.
Properly installed, operated and maintained this stove will not emit fumes into the dwelling. Occasional fumes from de ashing and re fuelling may occur.
However, persistent fume emission is potentially dangerous and must not be tolerated. If fume emission does persist, then the following immediate action
should be taken:
(a) Open doors and windows to ventilate the room and then leave the premises.
(b) Let the fire go out.
(c) Check for flue or chimney blockage and clean if required.
(d) Do not attempt to relight the fire until the cause of the fume emission has been identified and corrected.
If necessary seek expert advice.
The most common cause of fume emission is flueway or chimney blockage. For your own safety these must be kept clean at all times.
PREPARATORY WORK AND SAFETY CHECKS
Chimney
In order for the stove to perform satisfactorily the chimney height must
be sufficient to ensure an adequate draught of approximately 15 Pa so as
to clear the products of combustion and prevent smoke problems into the
room.
NOTE: A chimney height of not less than 4.5 metres measured vertically
from the outlet of the stove to the top of the chimney should be
satisfactory. Alternatively the calculation procedure given in EN 13384-1
may be used as the basis for deciding whether a particular chimney design
will provide sufficient draught. BS EN 15287-1:2007 gives additional
details.
The outlet from the chimney should be above the roof of the building in
accordance with the provisions of Building Regulations Approved
Document J.
If installation is into an existing chimney then it must be sound and have
no cracks or other faults which might allow fumes into the house. Older
properties, especially, may have chimney faults or the cross section may
be too large i.e. more than 230 mm x 230 mm. Remedial action should
be taken, if required, seeking expert advice, if necessary. If it is found
necessary to line the chimney then a flue liner suitable for solid fuel must
be used in accordance with Building Regulations Approved Document J.
Any existing chimney must be clear of obstruction and have been swept
clean immediately before installation of the stove. If the stove is fitted in
place of an open fire then the chimney should be swept one month after
installation to clear any soot falls which may have occurred due to the
difference in combustion between the stove and the open fire.
If there is no existing chimney then any new system must be to the
designation described above and in accordance with Building Regulations
Approved Document J.
A single wall metal fluepipe is suitable for connecting the stove to the
chimney but is not suitable for use as the complete chimney. The chimney
and connecting fluepipe must have a minimum diameter of 150 mm and its
dimension should be not less than the size of the outlet socket of the stove.
Any bend in the chimney or connecting fluepipe should not exceed 45°. 90°
bends should not be used.
Combustible material should not be located where the heat dissipating
through the walls of fireplaces or flues could ignite it. Therefore when
installing the stove in the presence of combustible materials due account
must be taken of the guidance on the separation of combustible material
given in Building Regulations Approved Document J and also in these stove
instructions.
If it is found that there is excessive draught in the chimney then a draught
stabiliser should be fitted. Fitting of a draught stabiliser will affect the
requirement for the permanent air supply into the room in which the stove
is fitted in accordance with Approved Document J (see also combustion air
supply).
Adequate provision e.g. easily accessible soot door or doors must be
provided for sweeping the chimney and connecting fluepipe where it is not
intended for the chimney to be swept through the appliance.
Hearth
The hearth should be level and able to accommodate the weight of the stove
and its chimney if the chimney is not independently supported. The weight
of the stove is indicated in the brochure.
The stove should preferably be installed on a non-combustible hearth of
a size and construction that is in accordance with the provisions of the
current Building Regulations Approved Document J.
The clearance distances to combustible material beneath, surrounding
or upon the hearth and walls adjacent to the hearth should comply with
the guidance on the separation of combustible material given in Building
Regulations Approved Document J and also in these stove instructions.
If the stove is to be installed on a combustible floor surface, it must
be covered with a non-combustible material at least 12 mm thick, in
accordance with Building Regulations Approved Document J, to a distance
of 30 cm in front of the stove and 15 cm to each side measuring from the
door of the combustion chamber.

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Lighting Instructions
Combustion air supply
In order for the stove to perform efficiently and safely there must be an adequate air supply into the room in which the stove is installed to provide
combustion air. The provision of air supply to the stove must be in accordance with current Building Regulations Approved Document J. Special attention
should be taken in newer build properties where the design air permeability is less than 5m3/h.m2. Approved Document J gives more information on this.
An opening window is not appropriate for this purpose.
The fitting of an external air kit direct to outside air must not be considered substitute for installing the appliance with a permanently open air
vent in compliance with ventilation requirements stated in Approved Document J. Please reference ADJ for further guidance.
Connection to chimney
Stoves may have a choice of either a rear or top flue gas connector that allows connection to either a masonry chimney or a prefabricated factory made
insulated metal chimney in accordance with their instructions. In some cases it may be necessary to fit an adaptor to increase the diameter of the flue to
the minimum required 150 mm section of the chimney or liner. All joints in the connection between the stove and the chimney must be made gastight using
fire cement and where necessary fire-proof rope infill. Means should be made for sweeping the entire length of the flue, be that through the appliance or
by suitable sweeping hatch in the flue.
Commissioning and handover
Ensure all parts are fitted in accordance with the instructions.
On completion of the installation allow a suitable period of time for any fire cement and mortar to dry out, before lighting the stove. Once the stove is under
fire check all seals for soundness and check that the flue is functioning correctly and that all products of combustion are vented safely to atmosphere via
the chimney terminal.
On completion of the installation and commissioning ensure that the operating instructions for the stove are left with the customer. Ensure to advise the
customer on the correct use of the appliance and warn them to use only the recommended fuel for the stove.
Advise the user what to do should smoke or fumes be emitted from the stove. The customer should be warned to use a fireguard to BS 8423:2002 (Repla-
ces BS 6539) in the presence of children, aged and/or infirm persons.
IMPORTANT NOTES
General
Before lighting the stove check with the installer that the installation work
and commissioning checks described above have been carried out correctly
and that the chimney has been swept clean, is sound and free from any
obstructions. As part of the stoves’ commissioning and handover the
installer should have shown you how to operate the stove correctly.
CO Alarm
Your installer should have fitted a CO alarm in the same room as the
appliance. If the alarm sounds unexpectedly, follow the instructions given
under “Warning Note” above.
Air Controls
Manually operated air control can be managed by adjusting the air control
valve to increase/decrease the air flow to the stove.
Use of fireguard
When using the stove in situations where children, aged and/or infirm
persons are present a fireguard must be used to prevent accidental contact
with the stove. The fireguard should be manufactured in accordance with
BS 8423:2002.
Chimney cleaning
The chimney should be swept at least twice a year. It is important that
the flue connection and chimney are swept prior to lighting up after a
prolonged shutdown period.
If the stove is fitted in place of an open fire then the chimney will require
sweeping after a month of continuous operation. This is a precaution to
ensure that any “softer” deposits left from the open fire usage have not
been loosened by the higher flue temperatures generated by the closed
stove.
In situations where it is not possible to sweep through the stove the
installer will have provided alternative means, such as a soot door. After
sweeping the chimney the stove flue outlet and the flue pipe connecting the
stove to the chimney must be cleaned with a flue brush.
Periods of Prolonged Non-Use
If the stove is to be left unused for a prolonged period of time then it
should be given a thorough clean to remove ash and unburned fuel residues.
To enable a good flow of air through the appliance to reduce condensation
and subsequent damage, leave the air controls fully open.
Extractor fan
There must not be an extractor fan fitted in the same room as the stove as
this can cause the stove to emit smoke and fumes into the room.
Aerosol sprays
Do not use an aerosol spray on or near the stove when it is alight.
Use of operating tools
Always use the operating tools provided when handling parts likely to be hot
when the stove is in use.
Chimney Fires
If the chimney is thoroughly and regularly swept, chimney fires should not
occur. However, if a chimney fire does occur turn off the stove immediately
and isolate the mains electricity supply (if applicable), and tightly close the
doors of the stove. This should cause the chimney fire to go out. If the
chimney fire does not go out when the above action is taken then the fire
brigade should be called immediately. Do not relight the stove until the
chimney and flueway have been cleaned and examined by a professional.
Permanent air vent
The stove requires a permanent and adequate air supply in order for it
to operate safely and efficiently. In accordance with current Building
Regulations the installer may have fitted a permanent air supply vent into
the room in which the stove is installed to provide combustion air. This air
vent should not under any circumstances be shut off or sealed.

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Lighting Instructions
Possible causes of
malfunctions and how to
rectify them
Poor draft in the stove after new installation
• Check the dimensions of the chimney so that they correspond to the
ones stated in the installation instructions.
• Check that there is nothing in the chimney to restrict the smoke and
that no nearby buildings or trees affect the winds around the chimney.
It is difficult to light the fire and the fire dies after
a short time
• Check that the wood is sufficiently dry.
• Too great a negative pressure in the house, for example when using
a kitchen extractor fan or other mechanical ventilation. Open a
window near the hearth before lighting the fire. Also try lighting some
newspaper and holding it up inside the firebox to get the draft going.
• The supply air duct from outdoors can be partially or totally blocked.
Remove the hose and try test lighting with combustion air from the
room.
• Check that the combustion air damper is open.
• The smoke outlet of the stove may be blocked with soot, which can occur
after sweeping.
Lift the smoke baffle out and check.
• Finally, go through the lighting instructions again.
Perhaps the amount of kindling was too small and therefore the base
embers were too weak and cold to light the next load of wood.
Abnormal amounts of soot form on the glass
There is always a certain amount of soot on the glass and this is added to
with each lighting. Soot on the glass is caused by three things:
• The wood is damp, which causes poor combustion and generates a lot of
smoke as a result.
• Too low temperature in the firebox, which causes incomplete combustion
and poor draft in the chimney.
• Handling is not correct, for example the hatch was not in the lighting
position for 5-10 min.
Check the moisture content of the wood, ensure that you have good
base embers and go through the lighting instructions one more time.
Smoke odour around the stove for periods
This can occur when wind blows down the chimney and most often occurs
when the wind is from a particular direction. Another reason could be that
the hatch was opened when there was a lot of flame.
Painted parts have become discoloured
If painted parts have discoloured it is due to excessive temperature in
the firebox. The reason for the excessive temperature can be that the
maximum amount of wood has been used or that inappropriate fuel has
been used (for example building waste, large quantities of finely chopped
off cuts). The warranty does not cover damage of this type. If a problem
occurs that you cannot rectify yourself, contact the dealer or a chimney
sweep.
We hope that these lighting tips give you enjoyable, economical and
problem free use of your Contura stove.
Sweeping
Sweeping the chimney ducts and chimney connections should be carried out by a chimney sweep. Sweep the stove
by scraping and/or brushing. A soot vacuum cleaner is most appropriate however. If a chimney fire occurs or is
suspected, the combustion damper and the door must be closed. If necessary, contact the fire brigade to extinguish
it. The chimney must always be inspected by a chimney sweep after a chimney fire.
!
• During operation, the surfaces of the stove become very hot and can cause burn
injury if touched.
• Be aware of the strong heat radiated through the hatch glass.
• Placing flammable material closer than the safe distance indicated may cause a fire.
• Pyre lighting can cause quick gas ignition with the risk of damage to property and
personal injury.
• The ash-pan must be emptied when it is full. If this is not done, the air supply can
become blocked, resulting in poor function. In serious cases, ash can find its way
out through the damper.
• Modifications to the stove must not be carried out by unauthorised persons.

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Lighting Instructions
Damper Blocker, mandatory for
Smoke Control Areas
Damper Blocker for C700 series.
Position the damper blocker as illustrated.
Contura reserves the right to change dimensions and pro-
cedures described in these instructions at any time without
special notice. The current edition can be downloaded from
www.contura.eu
NIBE AB· Box 134 · 285 23 Markaryd · Sweden
contura.eu
811064 BAV SE-EX C700-8
2022-10-13