La Nordica Focolare 80 Idro Crystal D.S.A [21/76] Connection to the flue

5.2. CONNECTION TO THE FLUE

The connection to the stack must be performed with stiff pipes in steel comply with all current Standards and Regulations and to those

envisioned by the law.

It is FORBIDDEN to use metallic pipes or pipes in asbestos cement since they jeopardize the safety of the tting itself, considering

that they are subject to tears or breaks resulting in leaks of smoke.

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.

IMPORTANT: When using metallic pipes, they must be insulated with proper materials (coatings in insulating bers resistant up

to 600°C) in order to avoid deterioration of walls or of the counter-hood.

5.3. AIR FOR COMBUSTION

It is necessary to ventilate continuously the space included between the upper part, the sides of the device and the deector of the re-

proong 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 Picture 8 at page 68 - Picture 10 at page 69 represent the minimum requirements:

Top: Minimum opening 1000 cm

2

Base: Minimum opening 750 cm

always be installed since its function is that of letting the heat collected within the hood (overpressure) ow out into the room.

ATTENTION: We recommend making the counterplate in re-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,..).

5.4. EXTERNAL AIR INTAKE

There MANDATORY be sufcient 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.

B – forced convection: 150 cm

* (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 exible pipe (not furnished)for the external air intake. The connection pipe must be at with

a minimum diameter of (B1 Picture 12 at page 70), a maximum length of 4 m and with no more than 3 bends. If there is a direct connection