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3.2.4.
Air intake / flue gas system
The boilers are built with an open combustion chamber and are designed to be attached to a chimney. The combustion air is taken
directly from the environment in which the boiler is installed.
The burner needs air for the combustion of solid or liquid fuel. Therefore, it is necessary to provide openings for the entry of air into
the boiler room. Ensure that these openings are never obstructed.
It is mandatory to install the boiler in a room complying with the prescriptions of the regulations in force, which should be
considered as a full integral part of this manual.
The boiler has a flue discharge connection suited to be connected to a flue duct with a diameter as indicated in figures 2, 3, 4, 5, 6
("Øc" parameter).
With regard to flue discharge into the atmosphere, follow the regulations in force which should be considered as a full integral part
of this manual.
The flue ducts coming from the boiler must be connected to a chimney made in compliance with the applicable regulations, which
should be considered as a full integral part of this manual.
The chimney must be calculated to ensure that there is no positive pressure at the base.
Since it is a high performance boiler, the flue gas temperature is low.
Therefore condensate may appear inside the chimney pipe, especially if the boiler is operating with a two-stage burner.
The chimney must, therefore, comply with the following requirements:
• The diameter must not be less than the diameter of the boiler discharge pipe.
• It must be made of impermeable material, resistant to flue temperature and acid condensate.
• Low thermal conductivity, sufficient mechanical resistance, perfect seal, correctly calculated height and cross-section.
• Vertically positioned with a constant cross-section, without any bottlenecks.
• The end section must ensure constant, efficient discharge of flue in any atmospheric conditions.
During installation a special fitting must be installed allowing for flue gas sampling and subsequent burner regulation and the
measurement of the boiler efficiency.
It is mandatory to install a special section to allow the collection and discharge of acid condensates before these reach the
boiler.
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