Nordica DSA Manuel Utilisateur page 29

The exhaust pipe must be air-tight fastened to the stack and can have a maximum inclination of 45°; this to avoid excessive deposits
of condensate produced in the initial start-up phases and/or the excessive gripping of soot and moreover it avoids the slowing down
of the smokes at output.
The failed tightness of the connection can cause the malfunction of the device.
The internal diameter of the connection pipe must be equal to the external diameter of the smokes stub pipe of the device. This is
assured by the pipes complying with DIN 1298.
For a better working of the appliance, it is suggested to have a flue draught of 17-20 Pascal (=1.7-2 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 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.
IMPORTANT: When using metallic pipes, they must be insulated with proper materials (coatings in insulating
fibers resistant up to 600°C) in order to avoid deterioration of walls or of the counter-hood.
AIR FOR COMBUSTION
It is necessary to ventilate continuously the space included between the upper part, the sides of the device and the deflector of the
fire-proofing material of the hood.
For this reason, it is necessary to foresee an intake of air from the bottom (intake of fresh air) and a high output (output of hot
air). The spaces foreseen for the circulation of air indicated in
In this way, the following targets are achieved:
• a greater safety
• an increase of the heat created by air circulation around the device
• a better working of the appliance
The heat vent grating
This must always be installed since its function is that of letting the heat collected within the hood (overpressure) flow out
into the room.
ATTENTION: We recommend making the counterplate in fire-retardant plasterboard with self-supporting metal frame, so
that its weight does not bear on the aesthetic covering (marble). We recommend providing an inspection door on the
counter plate or elsewhere as suitable to provide easy accessibility and visibility of the safety devices (pressure gauges,
valves,..).
EXTERNAL AIR INTAKE
There MANDATORY be sufficient quantity of air for combustion and re-oxygenation of the room to ensure the device will work
properly. There should therefore be vents letting air in from outside the building and enabling circulation of air for combustion even
when the doors and windows are closed.
• The air intake must be in a position where it cannot be obstructed.
• The air intake should communicate with the room in which the device is installed and be protected with a grille.
• Vents may communicate with adjacent rooms but NOT with garages, kitchens, bathrooms or boiler rooms (FORBIDDEN).
• Any extractor hoods in the room where the device is installed must NOT operate at the same time as this could cause smoke
to enter the room, even with the fireplace's door closed.
Minimum dimensions (Picture
A – natural convection:
B – forced convection:
* (For a better comfort and corresponding oxygenation of environment, the combustion air can be directly withdrawn at the outside
through a junction (B1) which is to be connected with a flexible pipe (not furnished)for the external air intake. The connection pipe
must be flat with a minimum diameter of (B1
connection with the outside it must be endowed with a special windbreak.)
IMPORTANT: If you do not adopt the solution 1, you are obliged to adopt the solution 2. Otherwise, there is no
supply of air combustion, the product does not work!
Top: Minimum opening 1000 cm
Base: Minimum opening 750 cm
(Picture 8 pos. 6) has to be installed on the upper part of the hood at about 20 cm from the roof.
14):
300 cm
2
150 cm external air intake for the stack, if present (*B1);
2
150 cm external air intake for the fan, if present (B2);
2
150 cm internal air intake for the fan, if present (C);
2
Picture 14), a maximum length of 4 m and with no more than 3 bends. If there is a direct
Picture 8 - Picture 15 represent the minimum requirements:
2
2
ENgLIsH 29