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La Nordica Monoblocco Ghisa 750 Manual

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ENGLISH
CHIMNEY CAP
The draught of the ue 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 ue (Picture 5).
Should it be necessary to exceed the ridge of the roof, the chimney cap must assure the discharge also in case of windy weather (Picture 6).
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 ue internal one.
• be manufactured in such a way as to prevent the penetration of rain, snow, and any other foreign body in the ue.
• be easily checkable, for any possible maintenance and cleaning operation
CONNECTION TO THE FLUE
The connection to the stack must be performed with sti 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.
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 13 Pascal (=1.3 mm of column of water).
The measurement has always to be carried out with hot device (rated thermal performance).
When the depression exceeds 17 Pa (=1.7 mm of column of water), it is necessary to reduce the same by installing an additional draught
regulator (buttery 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 bers 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 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 7 - Picture 11 represent the minimum requirements:
Top: Minimum opening 800 cm
2
Base: Minimum opening 600 cm
2
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 (Picture 7 pos. 6) has to be installed on the upper part of the hood at about 20 cm from the roof. This must
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,..).
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