Nordica DORIS INFINITY Instructions Pour L'installation, L'utilisation Et L'entretien page 19

DORIS
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 3 gives some examples of execution.
The minimum section must be 4 dm
devices whose duct diameter is lower than 200 mm or 6.25 dm
example 25 x 25 cm) 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
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 as short as possible, straight, sealed and in compliance with Standards in
force. Assembly of the PROTECTION see Chapt.16.1.
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 of water column)
it is necessary to reduce the same with the installation of an additional flue adjuster (butterDORIS valve) on the
exhaust pipe or in the chimney.
For safety reasons the door of the stove must be opened only for the loading of the fuel or for removing the ashes,
while during the operation and
6.1. CHIMNEY CAP POSITION
The draught of the flue depends also on the suitability of the chimney cap.
Therefore, if it is handicraft constructed, the output section must be more than twice as big as the internal section of
the flue.
As it is necessary to exceed the ridge of the roof, the chimney cap must assure the discharge also in case of windy
weather (Picture 4).
The chimney cap must meet the following requirements:
•
have internal section equivalent to that of the stack.
•
have a useful output section twice as big as the flue internal one.
7193750 Rev.03 – EN
(for example 20 x 20 cm) for
2
the rest, the door of the hearth must
the rest, the door of the hearth must remain closed.
(1)
(3)
(for
2
(1) AISI 316 steel flue with double
chamber insulated with material
resistant to 400° C. 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.
(2)
(4)
A+1/2A
Max.
A+1/2A
A
Picture 3
19