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1.8 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.
Attention: the boiler must be installed ex-
clusively with an original Immergas “Green
Range” inspectionable air intake device and
fumes extraction system made of plastic, as
required by the regulations in force.
The plastic pipes cannot be installed outdoors,
for tracts longer than 40 cm, without suitable
protection from UV rays and other atmos-
pheric agents.
This system can be identified by an identifica-
tion mark and special distinctive marking
bearing the note: “only for condensing boilers”.
• Resistance factors and equivalent lengths. Each
flue component has a
Resistance Factor
based
on experimental 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 certain length in metres of pipe of the same
diameter; the so-called
equivalent length
,
can be obtained from the ratio between the
relative Resistance Factors.
All boilers have an
experimentally obtainable maximum Resistance
Factor equal to 100.
The maximum Resistance
Factor allowed corresponds to the resistance
encountered with the maximum allowed pipe
length for each type of Terminal Kit. This
information allows calculations to be made to
verify the possibility of setting up various flue
configurations.
•
Positioning the gaskets (black) for “green
range” flue systems.
Position the gasket cor-
rectly (for bends and extensions) (Fig. 1-6):
- gasket (A) with notches, to use for bends;
- gasket (B) without notches, to use for exten-
sions;
N.B.:
if component lubrication (already car-
ried out by the manufacturer) is not sufficient,
remove the residual lubricant using a dry cloth,
then to ease fitting coat the parts with talc, sup-
plied in the kit.
• Coupling extension pipes and concentric
elbows. 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 previously installed
element in order to ensure sealing efficiency of
the coupling.
Attention:
if the exhaust terminal and/or
concentric extension pipe needs shortening,
consider that the internal duct must always
protrude by 5 mm with respect to the external
duct.
•
N.B.:
for safety purposes, do not obstruct the
boiler intake/exhaust terminal, even temporar-
ily.
•
N.B.:
when installing horizontal pipes, a mini-
mum inclination of 3% must be maintained and
a section clip with pin must be installed every
3 metres.
1.9 TABLES OF RESISTANCE FACTORS
AND EQUIVALENT LENGTHS.
TYPE OF DUCT
Resistance
Factor
(R)
Equivalent length
in m of concentric
pipe Ø 80/125
Concentric pipe Ø 80/125 m 1
2.1
1
Concentric bend 90° Ø 80/125
3.0
1.4
Concentric bend 45° Ø 80/125
2.1
1
Terminal complete with concentric
horizontal intake-exhaust Ø 80/125
2.8
1.3
Terminal complete with concentric
vertical intake-exhaust Ø 80/125
3.6
1.7
Concentric bend 90° Ø 80/125 with
inspection
3.4
1.6
Stub pipe with inspection Ø 80/125
3.4
1.6
