Flue; Chimney Pot - LA NORDICA STEFANY FORNO BII Instructions Pour L'installation, L'utilisation Et L'entretien

STEFANY FORNO BII - SVEZIA NEW BII - NORVEGIA NEW BII
The heating of the environment is made by:
a) Convection : (70%) the air passage through the double mantel of the stove releases heat into the environment;
b) Irradiation : (30%) through the panoramic glass and the external hot surfaces of the stove, the heat is radiated into the environment.
(See chapter CALCULATION OF THE THERMAL POWER).
The stove is equipped with controls of primary and secondary air by which it is adjusted the combustion air.
1A - PRIMARY AIR register (right lever)
Below the hearth door, on the front right side, there is the primary air register, in the style of lever
With this air register, it is adjusted the passage of primary air into the low part of the stove and through particular channels flows in the
fuel direction. The primary air is necessary for the combustion process during lighting. The ash drawer must be regularly emptied, so
that the ash does not obstruct the entry of the primary air for the combustion. In order to open the air flow, the bar must be completely
pulled out. During wood combustion, the register of primary air must be opened only for a while, because otherwise the wood burns
too fast and the stove may overheat (see chapter NORMAL OPERATION).
2A - SECONDARY AIR register (left lever)
Below the hearth door, on the left front side there is the secondary air register
The secondary air, passing through the two lateral jambs of the front side, heats itself starting the double combustion and keeping at
the same time the glass clean (with open register).
When the bar is pushed to the back the passage of the secondary is completely open (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.
The adjustment of the registers necessary to reach the rated calorific yield is the following one:
Fuel Hourly consumption
Logs of wood

7. 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.
The minimum section must be 4 dm
dm (for example 25x25 cm) for appliances with a diameter of more than 200 mm.
2
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 (See chapter CONNECTING A FIREPLACE OR OPEN HEARTH TO THE FLUE).
7.1.

CHIMNEY POT

The flue draught depends on the suitability of the chimney pot.
It is therefore essential that, if built in a handcrafted way, the exit section is more than twice the internal section of the flue
(Picture 2 at page 41) .
As it must always go past the ridge of the roof, the chimney pot must ensure exhaust even in the presence of wind
The chimney pot must meet the following requirements:
• Have an internal section equivalent to that of the chimney.
• Have a useful exit section of double the internal section of the flue.
• Be built so as to prevent rain, snow or any foreign body entering the flue.
• Be easy to inspect, for any maintenance and cleaning operations.
7193400 - IT - EN - DE - FR
PRIMARY air
2,9 Kg/h OPEN (45 mm)
Picture 1 at page 41 shows some example solutions.
(for example 20x20 cm) for appliances whose pipe dimensions are less than 200 mm, or 6.25
2
(Picture 6 at page
(Picture 6 at page 44).
SECONDARY air
OPEN (45 mm)
44)
TERTIARY AIR
Pre-adjusted
(Picture 3 at page 42).
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