Green Heating Technology
27
Flue systems
Installation of the flue inlet/outlet
flange gasket
IMPORTANT:
For a correct and safe opera-
tion of the boiler it’s necessary to install, on
the inlet/outlet flange
2
, the gasket
1
includ-
ed in the boiler’s documents bag. Before
inserting the flue outlet pipe it’s therefore
very important to correctly place the gasket
on its seating as indicated in the figure.
General indications
To grant the functionality and efficiency of the appliance it is indispensable to realize inlet and outlet
ducts using flue accessories specific for condensing boilers.
WARNING: the specific flue accessories components for condensing boilers, especially the parts
which are in touch with the flues inlet, are so projected because they are made with
plastic ma
-
terials acids resistant
, but because of their nature,
they are not suitable to resist to the higher
temperature
of the flues of the traditional boilers. So
it is not possible to use traditional flue
components for the outlet ducts of the condensing boilers, neither vice versa .
When installing the pipes, we recommend lubricating the inside of their gaskets exclusively with
silicone
lubricants since their material (EPDM peroxide) is not compatible with other types of
oils or greases
If it is possible, we recommend to foresee (referring to the direction of the air/flue, see examples on
page 31) an upwards slope for all the inlet and outlet ducts, in order to:
f
PREVENT the water or dust or other objects entrance inside the INLET duct. In case of coaxial ducts,
use the special horizontal terminal, which is especially built to respect these slopes only for the first
tract of the inlet duct;
f
FACILITATE, in the OUTLET duct, the flowing back of the condense towards the combustion chamber,
which is built to work in these conditions and to discharge the condense. If so it is not possible, or if
there are some points where the condense stagnates inside the outlet duct and if it is not possible to
avoid this through a modification of the slope of the ducts, these points must be drained using the
specific kit of condense collector (consult the commercial catalogues of the original accessories), and
ducting the condense formed towards the outlet duct as foreseen by the norms in force in matter of
condensing boilers.
Air inlet and flue outlet terminals should be protected by suitable approved flue accessories, to avoid
environmental elements penetration.
Carefully follow the indications foreseen by the specific laws in force.
Respect the minimum and maximum flue length prescribed (see "Flue system types" on page 30).
In case of flue outlet on wall, the positions and the distances prescribed by the regulation mist be re
-
spected.
The outlet duct is the assembly of components that connect the boiler to the point where the flues
are discharged . The
outlet can be directly outdoor only in the case foreseen by the law in force and us-
ing at the end of the outlet duct a specific terminal.
