Secondary Air; Flue; Chimney Pot; Connection To The Chimney - Nordica ESTER BII Instructions Pour L'installation, L'utilisation Et L'entretien

primary air the lever should be completely pulled. The ash drawer has to be emptied regularly, so that ash cannot hinder the intake of
primary air for the combustion. Primary air is also necessary to keep fire live.
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
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).
It is possible to get the air SECONDARY directly from outside through a flexible tube fireproof NOT furnished (see chapter 14).
The adjustment of the registers necessary to reach the rated calorific yield is the following one:
ESTER
ESTER Forno

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.
6.2.

CONNECTION TO THE CHIMNEY

Products with automatic door closing (type 1) must operate, for safety reasons, with the furnace door closed (except during the fuel loading
or ash removal phases).
Products with non-automatic door closing (type 2) must be connected to their own flue.
Operation with doors open is only allowed when supervised.
The connection pipe to the flue must be as short as possible, straight horizontal and positioned slightly in ascent, and watertight.
Connection must be carried out with stable and robust pipes (we recommend a thickness of 2 mm) and be hermetically secured to the flue.
The internal diameter of the connection pipe must correspond to the external diameter of the cooker flue gas exhaust stub pipe (DIN 1298).
ATTENTION: as far as concern the realisation of the flue connection and flammable materials please follow the requirements provided by
UNI 10683 standard. The flue must be properly spaced from any flammable materials or fuels through a proper insulation or an air cavity.
The chimney pressure (DRAUGHT) must be at least 11 Pa 12 Pa (=1,1 =1.2 mm of water column). The measurement must always be
carried out when the appliance is hot (nominal calorific power). When the pressure exceeds 17 Pascal, it is necessary to reduce it through
the installation of an additional draught regulator (false air valve) on the exhaust pipe or in the chimney, according to the regulations in
force.
16
(Picture 6 at page 41)
Fuel PRIMARY air
Wood CLOSED
Wood CLOSED
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

SECONDARY air

9 mm OPEN
Picture 6 at page 41
ESTER BII - ESTER FORNO
TERTIARY AIR
PRE-ADJUSTED
PRE-ADJUSTED
(Picture 3 at page
7196430 - IT - EN - DE - FR
39).