Bedienungsanleitung La Nordica CORTINA FORNO (Seite 21 von 64) (Deutsch, Englisch, Französisch, Italienisch)

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CORTINA – CORTINA Forno

7196100 Rev.08 – EN 21

4.1. FIRST-AID MEASURES

Should any fire arise in the stack or in the flue:

a) Close the feeding door and the ash drawer door.

b) Close the registers of combustion air

c) Extinguish the fire using carbon dioxide fire-fighting means (CO

dust).

d) Seek immediate intervention of FIRE BRIGADE.

DO NOT EXTINGUISH FIRE USING WATER JETS.

When the fire has been extinguished, let the flue check by an expert to find possible cracks and permeable

points.

5. FLUE

Essential requirements for a correct operation of the

appliance:

• the internal section must be preferably circular;

• be thermally insulated and water-proof and

produced with materials suitable to resist to heat,

combustion products and possible condensates;

• not be throttled and show a vertical arrangement

with deviations not greater than 45°;

• if already used, it must be clean;

• observe the technical data of the instructions

manual;

Should the flues have a square or rectangular section,

internal edges must be rounded with a radius not lower

than 20 mm. For the rectangular section, the maximum

ratio between the sides must be ≤ 1.5.

A too small section causes a decrease of the draught. It

is suggested a minimum height of 4 m.

The following features are forbidden and therefore they

endanger the good operation of the appliance: asbestos

cement, galvanized steel, rough and porous internal

surfaces. Picture 3 gives some examples of execution.

The minimum section must be 4 dm

(for example 20

x 20 cm) for appliances whose duct diameter is lower

than 200 mm, or 6.25 dm

(for example 25 x 25 cm) for

appliances with diameter greater than 200 mm.

The draught created by the flue must be sufficient, but not

excessive.

A too big flue section can feature a too big volume to be heated and consequently cause difficulties in the

operation of the appliance; to avoid this, tube the flue along its whole height. A too small section causes a

decrease of the draught.

The flue must be properly spaced from any flammable materials or fuels through a proper

insulation or an air cavity.

It is forbidden to let plant piping or air feeding channels pass in the same flue. Moreover, it is forbidden to

create movable or fixed openings on the same for the connection of further other appliances.

5.1. CHIMNEY CAP

The draught of the flue depends also on the suitability of the chimney cap.

The

refore, if it is handicraft constructed, the output section must be more than twice as big as the internal

section of the flue.

Picture 3

(1) AISI 316 steel flue with double chamber

insulated with material resistant to 400°C.

Efficiency 100% excellent.

(2) Refractory flue with insulated double

chamber and external coating in lightweight

concrete. Efficiency 100% excellent.

(3) Traditional clay flue showing a square section

with cavities. Efficiency 80% excellent.

(4) Avoid flues with rectangular internal section

who

se ratio differs from the drawing.

Efficiency 40% poor.

A+1/2A

Max.

A+1/2A

(3)

(1)

(2)

(4)

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