17
X
C
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1-23
1-24
C
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INS
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MAINTEN
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1.16 DUCTING OF FLUES OR
TECHNICAL SLOTS.
Ducting is an operation through which, via
the introduction of one or more relevant pipes,
one achieves a system for the evacuation of the
combustion products of a gas appliance, made up
from the coupling of an existing or new ducting
pipe with a chimney, flue or technical slot (also
in new buildings) (Fig. 1-24). Ducting requires
ducts declared to be suitable for the purpose by
the manufacturer, following the installation and
user instructions, provided by the manufacturer
and the requirements of the standards in force.
Immergas ducting system.
The Ø 60 rigid and Ø
80 flexible “Green Range” ducting systems must
only be used for domestic use and with Immergas
condensing boilers.
In any case, ducting operations must respect
the provisions contained in the standard and in
current technical regulations; in particular, the
declaration of conformity must be compiled at
the end of work and on commissioning of the
ducted system. The instructions in the project
or technical report must likewise be followed, in
cases provided for by the standard and current
technical regulations. The system or components
of the system have a technical life complying with
current standards, provided that:
- it is used in average atmospheric and environ-
mental conditions, according to current regula-
tions (absence of fumes, dusts or gases that can
alter the normal thermophysical or chemical
conditions; existence of temperatures coming
within the standard range of daily variation,
etc.).
- Installation and maintenance must be per-
formed according to the indications supplied
by the manufacturer and in compliance with
the provisions in force.
- The max. possible length of the Ø 60 flexible
ducting vertical section is equal to 22 m. This
length is obtained considering the complete
Ø 80 exhaust terminal, 1m of Ø 80 pipe in
exhaust, two 90° Ø 80 bends at boiler outlet.
- The max. possible length of the Ø 80 flexible
ducting vertical section is equal to 30 m. This
length is obtained considering the complete
exhaust terminal, 1m of Ø 80 pipe in exhaust,
two 90° Ø 80 bends at boiler outlet for connect-
ing to the ducting system and two direction
changes of the flexible hose inside the chimney/
technical slot.
- The maximum possible length of the Ø 80 rigid
ducting vertical section is equal to 30 m. This
length is obtained considering the complete
Ø 80 exhaust terminal, 1m of Ø 80 pipe in ex-
haust, two 90° Ø 80 bends on the boiler outlet.
1.17 CONFIGURATION TYPE B, OPEN
CHAMBER AND FAN ASSISTED FOR
INDOORS.
The appliance can be installed inside buildings
in
23
or B
53
mode; in this case, all technical rules
and national and local regulations in force, must
be complied with.
For installation the suitable kit must be used,
referred to in paragraph 1.11.
1.18 FLUE GAS EXHAUST TO FLUE/
CHIMNEY.
The flue exhaust does not necessarily have to be
connected to a branched type traditional flue.
The flue exhaust, for boiler clots installed in C
configuration, can be connected to a special
LAS type multiple flue. For B
23
configurations,
exhaust is only allowed into individual chimney
or directly into the external atmosphere via a
relevant terminal. The multiple flues and the
combined flues must also only be connected to
type C appliances of the same type (condensing),
having nominal heat inputs that do not differ by
more than 30% less with respect to the maximum
that can be attached and powered by the same
fuel. The thermo-fluid dynamic features (flue
flow rate, % of carbon dioxide, % humidity etc....)
of the appliances attached to the same multiple
flues or combined flues, must not differ by more
than 10% with respect to the average boiler at-
tached. Multiple and combined flues must be
specially designed according to the calculation
method and requirements of the standards in
force, by professionally qualified technical staff.
Chimney or flue sections for connection of the
flue exhaust pipe must comply with requisites of
technical standards in force.
