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PLASMA 80:26
5.
FLUE
Essential requirements for a correct operation of the device:
•
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 device:
asbestos cement, galvanized steel, rough and porous
internal surfaces. Picture 4 gives some examples of
execution.
The minimum section must be 4 dm
cm) for devices whose duct diameter is
lower than 200 mm or 6.25 dm
for devices 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 device; 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 devices.
6.
CONNECTION TO THE CHIMNEY
For safety reasons the door of the appliances with constructive system 1, must be opened only for the
loading of the fuel or for removing the ashes, while during the operation and
must remain closed.
The appliances with constructive system 2 must be connected to their own flue. The operating with open
door is allowed under supervision. The connection pipe to the flue must be the shortest possible, right, tight
and according to the current regulations. Assembly of the PROTECTION see Chapt. 17.
The connection to the chimney must be performed with stable and strong pipes (we recommend a
thickness of 2 mm). The pipe for smokes exhaust must be fixed hermetically to the chimney. The diameter
inside the connection pipe must correspond to the external diameter of the smokes exhaust small trunk of
the stove. This is ensured by pipes according to DIN 1298.
ATTENTION: Eventual flammable pieces in the area of 20 cm round the connection pipes must be
changed with fireproof and not sensitive to heat materials.
For a good operation of the equipment it is essential that in the installation place it is introduced sufficient
air for combustion (see Chapt. 10).
The depression on the chimney should be 12 Pa (= 1,2 mm of water column). The measurement must be
done always with the equipment hot (rating calorific value). When the depression exceeds 17 PA (1.7mm
7193601 Rev.04 – EN
(for example 20 x 20
2
(for example 25 x 25 cm)
2
(1)
(2)
(3)
(4)
(1)
AISI 316 steel flue with double chamber
insulated with material
Efficiency 100% excellent.
(2) Refractory flue with double insulated chamber
and external coating in lightweight concrete.
Efficiency 100% excellent.
(3) Traditional clay flue square section with
cavities. Efficiency 80% excellent.
(4) Avoid flues with rectangular internal section
whose ratio differs from the drawing. Efficiency
40% poor.
the rest, the door of the hearth
A+1/2A
Max.
A+1/2A
A
resistant
to 400° C.
Picture 4
21
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