Jotul C 24 Manuel D'installation page 18

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Wood consumption
Wood consumption, at nominal heat output: Approx. 2.3 kg/h.
The size of the logs should be:
Kindling (finely split wood):
Length: 20 - 30 cm
Diameter: 2 - 5 cm
Quantity for kindling: 6 - 8 pieces
Wood (split wood):
Recommended length: 30 - 50 cm
Diameter: Approx. 8 cm
Stoking frequency: Approx. every 45 minutes
Fire size: 1.7 kg (nominal output)
Quantity required each time: 2 pcs.
Nominal heat output is achieved when the air vent is open
approximately 50% opening of the air vent.
5.2 Ash removal
Only remove ash when the fireplace is cold.
5.3 Using your stove in the spring or
autumn
In the transition period (spring/autumn), where there is less need
for heating, we recommend to make a single „top down" lighting,
perhaps with one stoke up to ensure that the combustion
chamber lining burns clean again.
5.4 Using your stove in various
weather conditions
Wind blowing on the chimney can have a great effect on how your
stove reacts in various wind conditions; you may need to adjust
the airflow to achieve good burning results. Fitting a damper
in the flue pipe may also help as it will give you the ability to
regulate the draught in changing wind conditions.
Fog can also have a great influence on how well a chimney draws;
you may again need to adjust the airflow settings to achieve good
burning results..
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5.5 Chimney
The chimney is the engine that drives the fireplace and it's
essential to have a good chimney in order for the fireplace to
function properly.
The draught in the chimney creates a vacuum in the stove.
The combustion air is also used for the airwash system that keeps
the window clear of soot.
The draught in the chimney is caused by the difference in
temperatures inside and outside the chimney. The greater the
temperature difference, the better the draught in the chimney.
It is therefore important to allow the chimney to reach operating
temperature before adjusting the air vents to restrict combustion
in the stove (a brickwork chimney takes longer to reach operating
temperature than a steel chimney).
It is particularly important to reach operating temperature as
quickly as possible on days on which the draught in the chimney
is poor due to unfavourable wind and weather conditions. Make
sure the fuel ignites as quickly as possible. Practical tip: Chop
the wood into much smaller pieces and use an extra firelighter.
NB: If the stove has not been used for some considerable time, it
is important to check the chimney pipe for blockage.