Green Heating Technology
22
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 25) 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 24).
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 using at the end of the outlet duct a specific terminal.
In case you foreseen to discharge the combustion products through
a chimney
(for
single user) or
a common flue
(for multiple users) the part of the evacuation system
(the chimney or the flue) to which the outlet duct of the condensing boilers is con-
nected,
must be declared suitable for this purpose by its producer
. In case of com
-
mon chimney, keep in mind the laws in force regarding the typologies and rates of
users.
Don't lean the flue pipe into the chimney, but stop it before the inner surface of the
chimney. The axis of the flue pipe must intersect the axis of the chimney or of the
flue duct.
In general situations the
evacuation systems
of the combustion products
must be
properly declared suitable from the producer of the same system
for wet function-
ing,
or must be supplied by the appliance’s producer
(gas boiler).
If the chimney (or the flue) were not suitable, it would be indispensable, to use it, to canalise it
through specific ducts, so for example through the original flue accessories.
00044 00
Flue duct
or chimney
NO
NO
YES
