10
ENGLISH
4.5 Chimneys and flue pipes
• The fireplace can be connected to a chimney and flue
pipe approved for solid fuel fired appliances with flue gas
temperatures specified in «2.0 Technical data.
• The chimney’s cross-section must be at least as big as the
flue pipe’s cross-section. See «2.0 Technical data» when
calculating the correct chimney cross-section.
• The fireplace should not be connected to a shared chimney.
Contact your local building authority regarding restrictions
and installation requirements.
• Connection to the chimney must be carried out in accordance
with the installation instructions from the supplier of the
chimney.
• Before making a hole in the chimney the fireplace should be
test-mounted in order to correctly mark the position of the
fireplace and the hole in the chimney. See fig. 1 for minimum
dimensions.
• Ensure that the flue pipe is inclined all the way up to the
chimney.
• Use a flue pipe bend with a sweeping hatch that allows it to
be swept.
Be aware of the fact that it is particularly important that
connections have a certain flexibility in order to prevent
movement in the installation leading to cracks.
N.B. A correct and sealed connection is very important for the
proper functioning of the product.
The chimney draught should never exceed 2.5 mm H
2
O (25 Pa)
when the fireplace is in use. If the draught is too strong you can
install and operate a flue damper to control the draught.
In case of chimney fire:
• Close all hatches and vents.
• Keep the firebox door closed.
• Check the loft and cellar for smoke.
• Call the fire service.
• Before use after a fire an expert must check the installation
in order to ensure that it is fully functional.
4.6 Control of functions (fig. 2)
When the product is set up, always check the control functions.
These shall move easily and function satisfactorily.
Jøtul MF 3 is equipped with the following controls:
Ash door vent control. (Fig. 2A)
Air vent control. (Fig. 2B)
5.0 Use
5.1 Choice of fuel
Always use quality firewood or briquetted coal (see point 5.6).
This will give you optimal results, any other fuel may damage
the fireplace.
5.2 Jøtul’s definition of quality firewood
By quality firewood we mean logs of, for example, birch, beech,
and pine.
Quality firewood should be dried so that the water content is
maximum 20%.
To achieve this the wood should be chopped at the latest in late
winter or early spring. It should be cut and stacked so that air
circulates around it. The stacks should be covered on top so as
to avoid absorbing excessive rainwater. The logs should be taken
indoors in autumn for use during the winter season.
The amount of energy obtainable from of 1 kg of quality firewood
varies very little. On the other hand the specific weight of the
different kinds of wood varies considerably. As an example, a
certain volume of birch will provide less energy (kWh) than the
same volume of oak, which has a higher specific weight.
The amount of energy produced by 1 kg quality firewood is
about 3.8 kWh. 1 kg of completely dry firewood (0% humidity)
produces about 5 kWh, while firewood with a humidity level of
60% produces only around 1.5 kWh/kg.
Consequences of using damp wood may include:
• Appearance of soot/tar on the glass, in the fireplace and in
the chimney.
• The fireplace emits little warmth.
• Risk of chimney fire as a consequence of accumulation of soot
in the fireplace, flue pipe and chimney.
• The fire may die out.
Be especially careful never to lay a fire using any of the following
materials:
• Household waste, plastic bags, etc.
• Painted or impregnated wood (highly toxic)
• Chipboard or laminated boards
• Driftwood
This may harm the product and pollute the atmosphere.
N.B. Never use combustible liquids such as petrol, kerosene, red
spirit or similar to start the fire. This may cause harm to both
yourself and the product.
5.3 Log length and amount
The maximum length of logs to be used is 40 cm. Jøtul MF 3
has a nominal heat output of 6,5 kW. This is equivalent to a
consumption of approximately 2,1 kg of quality firewood per
hour.
An important factor for proper fuel consumption is that the logs
are the correct size. The size of the logs should be:
Kindling:
Length: 20-30 cm
Diameter: 2-5 cm
Amount per fire: 6-8 pieces
