Nordica ROSSELLA Plus FORNO - EVO Instructions For Installation, Use And Maintenance Manual page 16

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 register below on the left of the door of the hearth it is adjusted the passage of air through the drawer of ash 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 for the combustion. 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. The register is open when the lever is completely pulled out. The register is closed when the lever is introduced
(see chapter NORMAL OPERATION).
2A - SECONDARY air register
Over the hearth door there is the secondary air register. Also this control must be opened (then moved to the right), especially for
wood combustion, so that unburnt carbon does not undergo a post-combustion (see chapter NORMAL OPERATION).
The adjustment of the registers necessary to reach the rated calorific yield is the following one:
ROSSELLA Plus Forno EVO
NICOLETTA Forno EVO
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).
6.1. 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 38) .
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.
16
(Picture 6 at page 41)
(Picture 6 at page 41)
Fuel
Wood
Wood
Picture 1 at page 38
shows some example solutions.
(for example 20x20 cm) for appliances whose pipe dimensions are less than 200 mm, or 6.25
2
ROSSELLA PLUS FORNO - EVO NICOLETTA FORNO - EVO
1A - PRIMARY air 2A - SECONDARY air
CLOSED 2/3 OPEN
CLOSED 2/3 OPEN
TERTIARY AIR
Picture 6 Pos. 3 PRE-ADJUSTED
Picture 6 Pos. 3 PRE-ADJUSTED
(Picture 3 at page
7192300 - IT - EN - DE - FR
39).