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1.11 IMMERGAS FLUE SYSTEMS
Immergas supplies various solutions separately from the boilers
regarding the installation of air intake terminals and flue exhaust,
which are fundamental for boiler operation.
The boiler must be installed with an original Immergas
“Green Range” inspectionable air intake system and vi-
sible flue gas extraction system made of plastic, with the
exception of the C6 configuration, as required by the re-
gulations in force and by the product’s approval. This
flue system can be identified by the specific identifica-
tion mark bearing the following indication: “only for
condensation boilers”.
For non-original flue system, refer to the technical data
of the appliance.
The plastic pipes cannot be installed outdoors, for tracts
longer than 40 cm, without suitable protection from UV
rays and other atmospheric agents.
Resistance factors and equivalent lengths
Each flue component has a Resistance Factor based on experimen-
tal tests and specified in the table below.
The Resistance Factor for individual components is independent
from the type of boiler on which it is installed and has a dimen-
sionless size.
It is however, conditioned by the temperature of the fluids that
pass through the pipe and therefore, varies according to applica-
tions for air intake or flue exhaust.
Each single component has a resistance corresponding to a cer-
tain length in metres of pipe of the same diameter; the so-called
equivalent length, can be obtained from the ratio between the re-
lative Resistance Factors.
All boilers have an experimentally obtainable maximum Resi-
stance Factor equal to 100.
The maximum Resistance Factor allowed corresponds to the resi-
stance encountered with the maximum allowed pipe length for
each type of Terminal Kit.
This information allows calculations to be made to verify the pos-
sibility of setting up various flue configurations.
To dimension the flue ducting using commercial com-
ponents, refer to the table of combustion parameters
(Par. 4.2).
A
B
10
Positioning the gaskets (black) for “green range” flue systems.
Position the gasket correctly (for bends and extensions) (Fig. 10):
- gasket (A) with notches, to use for bends;
- gasket (B) without notches, to use for extensions.
If necessary, to ease the push-fitting, spread the elements with
commonly-used talc.
Extension pipes and concentric elbows push-fittings.
To install push-fitting extensions with other elements of the flue,
proceed as follows:
- Install the concentric pipe or elbow with the male side (smooth)
on the female side (with lip seal) to the end stop on the previou-
sly installed element in order to ensure sealing efficiency of the
coupling.
If the exhaust terminal and/or extension concentric pipe
needs shortening, consider that the internal duct must
always protrude by 5 mm with respect to the external
duct.
For safety purposes, do not obstruct the
boiler intake/exhaust terminal, even
temporarily.
The various parts of the flue system must
be checked to ensure that they have been
laid in such a way as to prevent the cou-
pled parts from detaching, in particular,
the flue exhaust duct in the Ø80 separa-
tor kit configuration. If the condition de-
scribed above is not adequately guaran-
teed, it will be necessary to use the
appropriate retaining clamp kit.
