9
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A
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(
B
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11
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MAINTEN
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1.11 IMMERGAS FLUE SYSTEMS.
Immergas supplies various solutions separately
from the indoor units regarding the installation
of air intake terminals and flue exhaust, which are
fundamental for indoor unit operation.
Attention: the indoor unit must be installed
exclusively with an original Immergas "Green
Range" inspectionable air intake system and
fume evacuation 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 flue can be identified by an identification
mark and special distinctive marking bearing
the note "only for condensation 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 in-
dividual components is independent from the
type of heat generator on which it is installed
and has a dimensionless size. It is however,
conditioned by the temperature of the fluids
that pass through the pipe and therefore,
varies according to applications 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 Fac-
tors.
All heat generators 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 of the gaskets (black) for “green
range” flue extraction systems.
Position the
gasket correctly (for bends and extensions)
(Fig. 9)
:
- gasket (A) with notches, to use for bends;
- gasket (B) without notches, to use for exten-
sions;
N.B.:
if necessary, to ease the push-fitting,
spread the elements with commonly-used talc.
• 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
heat generator intake/exhaust terminal, even
temporarily.
•
N.B.:
when installing horizontal pipes, a
minimum inclination of 3% towards the heat
generator must be maintained and a section
clip with pin must be installed every 3 metres.
1.12 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 80/125 Ø m 1
2.1
1
Concentric bend 90° 80/125 Ø
3.0
1.4
Concentric bend 45° 80/125 Ø
2.1
1
Terminal complete with concentric
horizontal intake-exhaust Ø 80/125
2.8
1.3
Terminal complete with concentric
vertical intake-exhaust 80/125 Ø
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
