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1.20 DUCTING OF FLUES OR TECHNICAL SLOTS.
Ducting is an operation through which by the introduction
of one or more relevant pipes, a system is realised 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. 32). Ducting requires the use of 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, Ø 80 flexible and Ø80 rigid “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. To guarantee reliability and operation over
time of the ducting system, make sure:
- it is used in average atmospheric and environmental conditions,
according to current regulations (absence of flue gas, dusts or
gases that can alter the normal thermophysical or chemical con-
ditions; existence of temperatures coming within the standard
range of daily variation, etc.).
- Installation and maintenance must be performed according to
the indications supplied by the manufacturer included with the
“green range” ducting system chosen and in compliance with
the regulations in force.
- The maximum length specified by the manufacturer must be
respected; in this regard:
- 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
Ø80 complete exhaust terminal, 1m of Ø 80 pipe in exhaust, two
90° Ø 80 bends at boiler outlet for connecting to the ducting
system and two direction changes of the flexible hose inside
the chimney/technical slot.
- The max. possible length of the Ø 80 flexible 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 exhaust,
two 90° Ø 80 bends at boiler outlet.
You can also install an additional Ø50 flexible ducting system
the specifications of which are found on the relevant instructions
sheet inside the kit.
1.21 CONFIGURATION TYPE B, OPEN CHAMBER AND
FAN ASSISTED FOR INDOORS.
The appliance can be installed inside buildings in B
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 cover kit must be used, referred to in (Par. 1.14
)
.
1.22 FLUE EXHAUST TO FLUE/CHIMNEY.
Flue exhaust does not necessarily have to be connected to a branched
type traditional flue for type B appliances with natural draught (CCR).
The flue exhaust, for boiler clots installed in C configuration, can
be connected to a special LAS type multiple flue. For B
23
con-
figurations, exhaust is only allowed into individual chimney or
directly into the external atmosphere via a relevant terminal, unless
otherwise provided for by local regulations in force. The multiple
flues and the combined flues must also only be connected to type C
appliances of the same type (condensation), 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 attached. Multiple and combine flues
must be specially designed according to the calculation method
and requirements of the standards, by professionally qualified
technical personnel. Chimney or flue sections for connection of
the flue exhaust pipe must comply with requisites of technical
standards in force. It is possible to replace a type C conventional
device with one provided with condensation only, if the derogation
conditions established by the regulations in force have been verified.
