The Flue; Chimney Pot - LA NORDICA HELGA EVO Manuel Utilisateur

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).
IMPORTANT: after using the riddling grate make sure the holes of the cast iron grate match the holes of the part to permit free
entrances of the primary air coming in.
2A - SECONDARY air register
Under the door of the hearth (on the left) 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 closed
when the lever is completely pulled out. The register is open 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
The adjustment of the registers necessary to reach the rated calorific yield is the following one:
Hourly consumption in kg/h
HELGA EVO

THE 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;
• all the sections of the flue gas duct must be accessible to inspection;
• inspection openings must be provided for cleaning.
• 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
Picture 1
porous internal surfaces.
For a correct installation please respect the sections/lengths of the flue shown in the technical data table. by installations
with different dimensions the flue must be suitably sized in accordance with EN13384-1.
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.
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 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).

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
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.
22
6)
(Picture
2,0
shows some example solutions.
PRIMARY air SECONDARY air
CLOSED
ENGLISH
Picture 9
TERTIARY AIR
OPEN Pre ADJUSTED
3).
(Picture
- A).
2) .
(Picture