Technical data

PLUMBING INSTALLER
Ed.06/2011 19
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53
type installation: room sealed combustion circuit appliance with inlet air
supply and outlet of exhaust gases by using separated ducts on different WALLS
of the building and far the one from the other: for example, the air inlet duct from
the wall behind the appliance and the flue exhaust duct far from the appliance or
on the roof (see
Figure 15, Figure 16, Figure 17, Figure 18 and Figure 19 starting
from page 27).
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63
type installation: allows to install air inlet/flue exhaust systems, by using
certified ducts, elbows and terminals purchased on the market. Moreover, it
permits to use pipe diameters bigger than 80 mm: for example when the
installation requires using the pipe of the larger diameter, caused by the longer
ducts. With this typology, for the calculus of the flue/air inlet system refer to the
duct Manufacturer data and furthermore to the flue composition, flow and
temperature (see Table 4 at page 20).
In the case the flue pipe system is installed to the wall and the one of the intake air
of the centrifugal fan is installed outdoor on the same wall, it is OBBLIGATORY to
have the flue pipe system at a distance of 1,5 m at least from the external intake air
pipe, in order to avoid that the combustion products will return in the ambient
heated.
In any case, use only approved ducts for the installation of the units. Upon request,
ROBUR S.p.A. can supply approved rigid pipes, coaxial pipes and terminals.
To determine the correct size of the piping system, its total pressure drop has to be
calculated.
Data to calculate the pressure drop for the air intake/flue exhaust system supplied on
request by Robur SpA are in Table 5 and Table 6 at page 20.
External terminals pressure drops are negligible since they are very low.
During the project design phase it is necessary to verify that the total inlet/outlet pipes
pressure drops are lower than the maximum pressure drop allowed by the appliance (see
Table 4).
The maximum lengths of the air supply and flue exhaust ducts, for different types of
installation, are given from Figure 3 to Figure 19. The above-mentioned length values are
APPROXIMATE and only for standard installations where the air supply and flue exhaust
ducts follow a linear path as shown in the relevant figures. Otherwise, you need to
calculate pressure drops.
!
When vertical flue pipes are installed, to prevent that condense drops enter the
extraction fan, on the base of the vertically mounted flue pipe a T-shaped piece must
be fitted in order to collect the condense.