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Beschikbare talen
Requirements for protection of
infl ammable fl oors in front of the
fi replace
The fl oor in front of the fi replace must be protected by
a sheet of metal or other non-infl ammable material. The
recommended minimum thickness is 0.9 mm. The fl oor
plate must comply with national laws and regulations.
Distance between fl oor and frame must be a minimum of
428mm (see Fig. 1f)
Contact your local building authorities regarding restrictions and
installation requirements.
4.2 Wall
Distance to combustible wall protected
by insulation (fi g. 1)
The Jøtul I 520 can be installed inside an open structure/
surround, provided that the distance from the wall (both
combustible and non-combustible) is at least 700 mm on the
sides with glass, and at least 362 mm on the sides without
glass. These distances must be observed because of the heat
that is transferred onto the ceiling and adjacent walls (Fig. 1
e and f). With this type of installation, the convection holes in
the front and sides of the surround can be omitted since there
are convection slots in the top.
Note: Do not place a solid plate on the top of the stove. There
must be at least 750 cm 2 of free air space at the top and at
least 500 cm 2 of free opening at the base.
Insulation requirements
When installing the insert in a home-built surround with
combustible walls protected by insulating material, the following
types and thicknesses of insulation can be used:
•
50 mm Jøtul JGFW-5 fi reproof board (specifi c thermal
conductivity = λ value = 0.06 W/mK)
•
50 mm Rockwool Fire Protective Bats (λ value = 0.046 W/
mK)
•
150 mm Siporex (λ value = 0.144 W/mK).
Other materials may be used. The insulation properties must
then always be equal to or exceed the thermal resistance* (R)
requirements for the 50 mm Jøtul JGFW-5.
*
Thermal resistance (R) is an indication of how well a material
insulates with respect to its thickness. Thermal resistance
(R) is calculated as the thickness (d) of the material divided
by the thermal conductivity of the material. R = d/λ value.
The thermal resistance (R) for the Jøtul JGFW-5 is 0.83 m2*K/W.
Distance to combustible wall protected
by fi rewall (Fig. 1)
Requirements for regulation fi rewalls
The fi rewall must be at least 100 mm thick and made of brick,
concrete or lightweight concrete. Other materials and structures
with satisfactory documentation may also be used.
Contact your local building authorities regarding restrictions and
installation requirements.
Distance to non-infl ammable wall
"Non-infl ammable wall" here means a non-bearing wall of
continuous brickwork/concrete.
Requirements for fi replace surround
Fireplace surrounds must be made of a non-infl ammable
material
Note that the entire back wall and, if any, side walls within the
surround must be covered with insulation/fi rewalls.
If the cowl is built up to the ceiling and the ceiling is of
infl ammable material, extra panelling must be installed above
the top of the heating chamber and above the cowl's vents in
order to prevent the ceiling becoming hot. Use for example:
Rock wool, 100 mm thick, on a steel plate (min. 0.9 mm). See
Fig. 1 e and f. Ensure there is adequate ventilation in the top
of the cowl – e.g. a gap under the ceiling.
NB: Remember that it must be possible to sweep and
inspect the installation.
4.3 Air supply
Air must fl ow between the insert and the brickwork, and it is
extremely important that there is an unimpeded air supply to
the air inlets.
The air inlet dimensions specifi ed in the text are minimum
requirements.
Required air vent sizes (for air circulation):
Base: Minimum of 500 cm
Top: Minimum of 750 cm
Note: See fi g. 1 e and f
4.4 Ceiling
The fi replace can be fi tted with the top edge of the hot air
opening of the surround at least 400 mm below a ceiling of
infl ammable material. See Fig. 1 e and f. Ensure there is
adequate ventilation in the top of the cowl – e.g. a gap under
the ceiling.
4.5 Chimney
The chimney is the engine that drives the fi replace and it's
essential to have a good chimney in order for the fi replace
to function properly.
The draught in the chimney creates a vacuum in the stove.
This vacuum draws the smoke out of the stove and takes in air
through the combustion air baffl e to fuel the burning process.
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 diff erence in
temperatures inside and outside the chimney. The greater the
temperature diff erence, 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).
ENGLISH
free opening.
2
free opening.
2
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