Technical Description; Flue - LA NORDICA Helga Notice D'utilisation

HELGA

5. TECHNICAL DESCRIPTION

The chimney stoves of La Nordica are suitable to heat living spaces for some periods.
As fuel, wood logs are used. The appliance works as an intermittent operating appliance.
The stove is made of sheets in galvanized and painted steel, of cast iron (grate and grate holder of the hearth, exhaust pipe) of majolica
tiles and of glass panels. The hearth is totally sheathed with cast-iron single sheets and refractory material (NORDIKER). Inside there are
a easy extractable thick flat grate and its holder. The combustion chamber is hermetic welded and is sheathed with a painted steel carter.
The inside smoke plate made of vermiculite, reflects the fire radiation and increases the internal temperature of the combustion chamber.
This process together with the exhaust gases flows, makes optimal the combustion and improves the efficiency.
The one-piece ceramic glass of the door (resistant up to 700°C) allows a wonderful view on the burning flames. Furthermore, it is thus
avoided the output of sparks and smoke.
Below the hearth grate there is an extractable ash drawer,
The heating of the environment is made by irradiation: through the panoramic glass and the external hot surfaces of the stove, the
heat is radiated into the environment.
The stove is equipped with controls of primary and secondary air by which it is adjusted the combustion air.
1A - PRIMARY air register
With the air register located under the door of the hearth (on the left), it is possible to adjust the air flow through the ash drawer and
the grating in direction of the fuel. The primary air is necessary for the combustion process during the ignition. The ash drawer has to
be emptied regularly, so that ash cannot hinder the intake of primary air for the combustion. The register is closed when the lever is
completely pulled out. The register is open when the lever is introduced.
During the combustion of wood, the primary air register must be opened only a few, since otherwise the wood burns quickly and the
device can overheat (see chapter NORMAL OPERATION).
2A - SECONDARY air register
Under the door of the hearth (on the right) there is a secondary air register.
This valve must be opened, in detail, for the combustion of wood, so that unburnt carbon can be subject to a post-combustion, increasing
the yield and assuring the cleaning of the glass. Through this register it is possible to adjust the power of the stove. The register is open
when the lever is completely pulled out. The register is closed when the lever is introduced. (see chapter NORMAL OPERATION).
It is possible to get the air SECONDARY directly from outside through a flexible tube (fireproof NOT furnished
A).
The adjustment of the registers necessary to reach the rated calorific yield is the following one:
HELGA
ACCESSORIES

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.
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).
7196806
(Picture 7 at page 61)
(Picture 7 at page 61)
Hourly consumption in Kg/h
1,9
RING Ø 100 mm air fitting
ventilation additional
SERIES
Picture 1 at page 58 shows some example solutions.
(for example 20x20 cm) for appliances whose pipe dimensions are less than 200 mm, or 6.25
2
(Picture 8 at page 61).
PRIMARY air
CLOSED
POKER
SERIES
Picture 9 at page 62
SECONDARY air TERTIARY AIR
OPEN Pre ADJUSTED
GLOVE
SERIES
17