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•
After having started the fire with small pieces of wood and waited until it is well lit, close the primary air register and check combustion
using secondary air .
•
Bring the flue gas register to the oven position.
•
Close the any butterfly valve placed on the flue gas exhaust pipe must also be opened.
The control regulation during the ignition phase is the following :
TERMOSOVRANA
The register regulation necessary in order to obtain nominal calorific output is the following (see Cap. TECHNICAL DATA):
Fuel
WOOD
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 3 at page
56) .
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,comply with all current Standards and Regulations and to those envisioned
by the law, 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.
IMPORTANT: the unused flue gas exhaust hole must be covered with its respective cap (See chapter: DIMENSIONS).
For a better working of the appliance, it is suggested to have a flue draught of 17 - 20 Pascal (= 1,7 - 2,0 mm of column of water).
The measurement has always to be carried out with hot device (rated thermal performance).
When the depression exceeds 20 Pa (=2,0 mm of column of water), it is necessary to reduce the same by installing an additional draught
regulator (butterfly valve) on the exhaust pipe or in the chimney, according to the regulations in force.
For correct appliance operation, it is essential that sufficient air for combustion is introduced into the place of installation (see paragraph
AIR FLOW IN THE PLACE OF INSTALLATION DURING COMBUSTION).
22
PRIMARY air
Hourly wood consumption in Kg/h
3,9
Picture 2 at page 56
shows some example solutions.
(for example 20x20 cm) for appliances whose pipe dimensions are less than 200 mm, or 6.25
2
SECONDARY air
OPEN
OPEN
PRIMARY air
OPEN
TERMOSOVRANA - DSA
SMOKES control
Cooker function
SECONDARY air
OPEN
(Picture 4 at page
57).
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