Chimney Cap; Connection To The Flue; Air For Combustion - Nordica MONOBLOCCO GHISA 750 Manuel Utilisateur

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.
ATTENTION: as far as concern the realisation of the flue connection and flammable materials please follow the requirements
provided by UNI 10683 standard. 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

CHIMNEY CAP

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
Should it be necessary to exceed the ridge of the roof, the chimney cap must assure the discharge also in case of windy weather
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.
• be manufactured in such a way as to prevent the penetration of rain, snow, and any other foreign body in the flue.
• be easily checkable, for any possible maintenance and cleaning operation

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 fitting 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.
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.
The chimney pressure (DRAUgHT) must be at least (see chap. TECHNICAL DATA SHEET) Pascal. The measurement has always to be carried
out with hot device (rated thermal performance).
When the depression exceeds 17 20 Pa (=1.7 =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
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,..).
Picture 7
Top:
Minimum opening 800 cm
Base:
Minimum opening 600 cm
(Picture 7 pos. 6) has to be installed on the upper part of the hood at about 20 cm from the roof. This must
(Picture 4).
Picture 14 represent the minimum requirements:
-
2
2
ENgLIsH
5).
(Picture
6).
(Picture
23