Nordica WANDA, Инструкция по установке, использованию и техническому обслуживанию, Страница: 17 / 52

“WANDA”
“7097030 - IT - EN - DE - FR”
17
5. TECHNICAL DESCRIPTION
Definition
: product according to
EN 13240.
The chimney stoves of La Nordica are suitable to heat living spaces for some periods. As fuel, wood logs are used.
The appliance is made up of a series of cast-iron elements joined to one another by a fixed joint, while the seal is assured by refractory
putty. The assembly is supported by tie rods and nuts located outside the heating body.
The devices are equipped with an integrated air circuit for the recovery of the heat made up of deflectors (radiant fins) on all external
surfaces of the heating body.
The devices are equipped with a hearth with double thickness rear part made up of a drilled extractible plate.
Through these holes, pre-heated air gets into the hearth; in this way, it is possible to achieve a post-combustion with an increase of the
yield and a reduction of emissions of unburnt gases.
The fireplace is equipped with a sight door with ceramic glass (resistant up to 700°C). This allows a charming sight on burning flames.
Moreover, in this way, any possible leak of sparks and smoke is avoided.
Room heating takes place:
a) by irradiation:
through the panoramic glass and the external hot surfaces of the stove, the heat is radiated into the environment;
b) by natural convection: the passage of air through the coating and the covering hood releases heat in the room .
c) by forced convection : a ventilation kit suitable to improve the distribution of heat by ventilation only either of the installation room
or of the adjacent local.
The device is equipped with registers of primary and secondary air.
A- PRIMARY air register
With the primary air control ( Picture 7 at page 43 - A ) is adjusted the passage of air through the ash drawer and the grate in the fuel
direction. The primary air is necessary for the combustion process. The ash drawer must be regularly emptied, so that the ash does not
obstruct the primary air entry. Through the primary air the fire is also kept alive.
During wood combustion, the register of primary air must be opened only for a while, because otherwise the wood burns fast and the
stove may overheat. For the correct arrangement (see chapter Normal operation).
B - SECONDARY air register
Over the door of the hearth there is the secondary air control ( Picture 7 at page 43 - B ).This regulator must be open (the lever must be
moved to the right), especially for wood combustion, so that un-burnt carbon does not undergo a post-combustion. See chapter Normal
operation. Through this register it is possible to adjust the power of the stove.
Leaving it slightly open, according to the flue of the chimney, it is possible to keep the glass clean.
C - Air register for the heating of the environment ( Picture 7 at page 43 pos. C ).
This register, through a fan controlled by a regulator, adjusts the output of warm air in the environment Picture 7 at page 43 pos. D .
In the configuration A (see paragraph Canalization) this register adjusts the warm air flow coming out from the front side of the stove;
in the
configuration B
it adjusts the warm air flow coming out from the front and rear side of the stove, without closing the warm air
coming out from the back of the appliance.
6. FLUE
Essential requirements for correct appliance operation:
• the internal section must preferably be circular;
• the appliance must be thermally insulated and impermeable and built with suitable materials which are resistant to heat, combustion
products and any condensation;
• there must be no narrowing and vertical passages with deviations must not be greater than 45°;
• if already used, it must be clean;
• the technical data from the instruction manual must be respected;
If the flues are of a square or rectangular section, the internal edges must be rounded with a radius of not less than 20 mm.
For the rectangular section, the maximum ratio between the sides must be ≤ 1.5.
A section which is too small causes a reduction in draught. A minimum height of 4 m is advisable.
The following materials are FORBIDDEN and compromise the good operation of the appliance: asbestos cement, galvanised steel, rough
and porous internal surfaces. Picture 1 at page 40 shows some example solutions.
The minimum section must be 4 dm
2
(for example 20x20 cm) for appliances whose pipe dimensions are less than 200 mm, or 6.25
dm
2
(for example 25x25 cm) for appliances with a diameter of more than 200 mm .
The draught created by your flue must be sufficient but not excessive.
A section of the flue which is too large can present a volume which is too large to heat and therefore cause operating difficulties for the
appliance; to avoid this, it is necessary to intubate the appliance for its entire height. A section which is too small causes a reduction in
draught.
The flue must be at a suitably distance from flammable or combustible material using suitable insulation or an air space.
It is FORBIDDEN to pass system piping or air ducts inside the flue. It is also forbidden to create moveable or fixed openings on the flue
itself, for the connection of further different appliances.