Arca Caldaie ASPIRO DUO TECH, Установка, эксплуатация и обслуживание

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5.4. Heating system expansion tank
According to the regulations in force in Italy, any heating appliance with solid fuels must be equipped with
open expansion tanks.
5.5. Chimney
The flue duct is very important for what concerns a proper boiler operation; it must be completely waterproof
and adequately insulated. New or older fuel ducts not complying these prescriptions can be reused putting an
inner stainless steel duct into the existing flue duct; the gap between the two ducts must be filled with
insulating material. Flue ducts made of prefabricated concrete modules must be perfectly sealed in order to
avoid that the condensation products stain the external walls.
We strongly recommend to use a flue duct complying the regulations in force, especially regarding the
regulation EN 1806, which requires a resistance to a flue gases temperature of 1000°C. The customer is
responsible for any damage resulting from using unsuitable flue ducts.
In any case, the flue duct must feature enough drafting action, at least 2 mm water column of depression at
its base when cold. Flue ducts with not enough drafting action will make the boiler cutting off spontaneously