Contura C i40 Lighting Instructions Download Page 2

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Lighting Instructions

Burning correctly 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 kg kindling is. Also check what the normal 
and maximum weights look like. Once the lighting phase is complete, this 
insert must be operated 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. 

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. After the initial lighting phase, this insert is 
designed to burn with the door closed. This will achieve optimum.
1.  Open the control for the combustion air fully.
2.  Insert 3-4 firelighters, and about 2 kg of thinly chopped wood into the 

centre of the firebox. Stack the wood crossways.

3.  Light the fire and push the door to. But wait a few seconds until the fire 

takes hold before closing the door completely.

4.  The first load of logs should not be put on until the start up fire has 

become a glowing bed of embers.

Adding wood

1.  Open the door a few centimetres and allow the vacuum in the firebox to 

equalise for a few seconds before opening the door fully.

2.  Add 2 logs of a combined weight of approx 1,5-2 kg. Place one log 

diagonally and one or two logs on top. Then close the door.

3.  The combustion damper must be completely open for 3-5 minutes 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 stove and the draft in the chimney.

4.  A nominal energy output of 6 kW is achieved when the combustion air 

damper is 30% open and 2 logs weighing about 1.8 kg are added once 
per hour.

LIGHTING FOR THE FIRST TIME

The firebox insulation in your new insert consists of Thermotte®, 
a stone material with excellent insulating properties. It contains a 
certain amount of water that evaporates during the first lighting. 
Whilst this happens, combustion may seem to be slow, and soot may 
build up on the insulation panels. Do not compensate for the slow 
combustion by adding to the fire as this risks cracking the panels if 
they are put under ”stress” before they have cured.
When the panels regain their white colour they can be considered 
to have cured. 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.

Feeding Wood:

Chopped wood

Length: 25-50 cm
Diameter: 6-9 cm
Normal weight: 1,8 kg/hour
Max amount: 3 kg/hour  
(max 2 pieces per insertion. Max 3 kg per insertion)

QUICK LIGHTING

It is important that the wood catches fire 
quickly. Quick lighting is achieved by opening the 
combustion air damper fully or by leaving the 
door 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.

Correctly sized wood

Note that if too little kindling is used when lighting, or if the wood is too 
thickly cut, the fire box 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.

Kindling:

Finely chopped wood

Length: 25-35 cm
Diameter: 3–5 cm
Weight per lighting: 2,0 kg  
(approx. 10-12 finely chopped 
pieces)

This insert has a supply 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 
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 ”–”.

The damper

5.  The lowest output is obtained when the combustion air damper is 20% 

open and 2 logs are lit. The lowest output of 5 kW is obtained when 
the combustion air damper is 20% open and two 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 more wood should 
be added.

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