44
60T - 280T
COSMOGAS
14.1 - Flue exhaust and
combustion air intake duct
ATTENTION !!! This appliance must be
connected to a flue exhaust system that can bring the
flue gas into the open air outside of the building.
ATTENTION !!! The flue exhaust duct and
combustion air intake must be connected in
compliance with the national and local standards in
force.
ATTENTION !!! This appliance has flue gas
temperatures that can reach 90°C under certain
conditions. Therefore, use flue exhaust ducts in plastic
that can resist said temperature.
ATTENTION !!! This appliance is “condensing”.
To realise a flue exhaust, use materials in AISI 316L
stainless steel or polypropylene plastic materials to
prevent corrosion due to condensate acidity.
To this end, remember that this type of appliances
must have exhaust and intake ducts supplied by the
manufacturer of the appliance itself. Other types of ducts, if
used, must be approved for such intended use. The types
of exhaust for which the appliance is approved are shown
on the technical features table at the end of the manual,
under the “type” heading and on the plate affixed to the
Figure 14-1 - Exhaust/intake systems
14 - INSTALLATION - Air intake and flue exhaust ducts
C53
B23
boiler, again under the “type” heading.
The symbols used to define the type of exhaust are shown
below:
- B23, room intake and wall or ceiling mounted flue exhaust.
ATTENTION !!! If you install an appliance with
a B23 type exhaust, it will extract air for combustion
from the room in which it is located. Therefore, all the
precautions regarding room ventilation required by
national and/or local standards must be taken.
- C53, separated with ceiling-mounted exhaust and wall-
mounted intake or, in any case, in two potentially different
pressure points.
- C63, the boiler can be jointed to approved exhaust and
intake ducts of other brands.
ATTENTION !!! With the C63 type exhaust,
the condensate coming from the chimney cannot be
directed to the boiler.
During operation, especially in the winter, it is possible for
white smoke to come out of the appliance flue exhaust due
to high output. This is solely a natural phenomenon and no
cause for worry as it is the water vapour in the flue gases
that condense in contact with the external air.
14.1.1 - B23 suction/discharge type
In the event of B23 type combustion air intake/flue exhaust, it is
essential that at least as much air as is required for combustion
and room ventilation can flow through the room where these
appliances are installed. As such, it is a good idea to remember
that the combustion of 1m
3
of gas requires 11m
3
of air.
The natural inflow of air must be direct through permanent
openings to the outside on the walls of the room to ventilate,
away from sources of pollution like: roof vents of dubious
origin, industrial air exhausts, etc. (see section 5.1.1).
The vents must meet the following requisites:
have net passage cross-sections of at least 0,3 m
2
;
be made so that the vent openings both on the inside
and outside of the wall cannot be obstructed;
be protected, by example with grids, metal netting, etc.
The net passage cross-section must not be reduced by
these systems;
be located at a height near the level of the floor and such
not to interfere with proper flue exhaust device operation;
should this position not be possible, the ventilation
opening cross-section must be increased by 50%.