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Special folder “Room sealed” Boilers: definition, principle of operation and classification
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A boiler is known as “tight” when its operation is independent of the air of the room where it is installed. This principle is also called “room sealed boiler” or “forced flow”.
Largely widespread in Europe, the “tight” boilers showed their interest, as well on the level of the performance as of the operational safety. They represent today the majority of the new installations in France, generally in versions calleader “high efficiency”, but each day more, in system “Condensing”, whose performances arouse an interest increasingly larger.
One distinguishes the room sealed boilers from type C1, C3, C4 and C5*
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System of evacuation of smoke in house
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System of evacuation of smoke in multifamily apartment
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Principle of operation
The tight principle is also calleader “room sealed boiler ” or “forced flow” because an engine allows the aspiration of the surrounding air and the evacuation of the gases flarings.
This evacuation of the boiler is known as “in pressure”, in opposition to the traditional systems with natural draught, in “depression”.
The supply of air and the evacuation of smoke are ensured by two the flue, generally concentric: the external pipe guarantees the contribution of air necessary to combustion, the Internal pipe being used for the evacuation of smoke.
The system can also be made up of two the flue separate. This mode of installation in particular allowing to traverse longer distances between the boiler and outside, when the establishment of the buildings iminstalled it.
These the flue are assembled between them by Joint or collars and they comprise seals systematically.
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Foot-note
The C2 type is not marketed any more in France. It comprised one pipe being used at the same time with the supply of combustive air and the evacuation of the products as combustion.
Other types (C6 with C8) exist in Europe. They for the moment are not used in France.
The appliancees of the type A has are not intended to be connected to a pipe or a system of evacuation of the products of combustion. The combustive air is bleader in the room of installation. The products of combustion are evacuated by the ventilation system of the room at the same time as the foul air. E.g.: gas stove.
The appliancees of the type B are intended to be connected to a pipe or a system of evacuation of the products of combustion. The combustive air is bled in the room where the appliance is installed. E.g.: mural boiler, radiator gas. |
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*The classification of the tight appliancees (C1, C3, C4, C5.) is carried out:
 According to the configuration of the flue of supply of air and evacuation of smoke: into concentric, dissociated or separated.
According to the position of the terminal: horizontal or vertical.
According to the system: individual or collective.
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