C
53
C
93
X
26
27
18
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
1.18 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. 27)
. 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, Ø
80 flexible and Ø80 rigid “Green Range” ducting
systems must only be used for domestic use and
with Immergas condensing indoor units.
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 envi-
ronmental conditions, according to current
regulations (absence of flue gas, 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 regulations in force.
- The maximum length specified by the manu-
facturer 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 indoor unit
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 indoor unit
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 indoor unit
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.
1.19 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.
- Type B open chamber indoor units must not be
installed in places where commercial, artisan
or industrial activities take place, which use
products that may develop volatile vapours or
substances (e.g. acid vapours, glues, paints, sol-
vents, combustibles, etc.), as well as dusts (e.g.
dust deriving from the working of wood, coal
fines, cement, etc.), which may be harmful for
the components of the appliance and jeopardise
operation.
- in B
23
and B
53
configuration the indoor units
must not be installed in bedrooms, bathrooms
or bedsits, unless otherwise provided for by
local regulations in force. They must neither
be installed in rooms containing solid fuel heat
generators nor in rooms communicating with
said rooms.
- Installation of appliances in B
23
and B
53
con-
figuration is recommended in non-residential
premises and which are permanently ventilat-
ed.
For installation the cover kit must be used, re-
ferred to in
Paragraph 1.13
.
1.20 FLUE EXHAUST TO FLUE/CHIMNEY.
Flue exhaust does not necessarily have to be
connected to a branched type traditional flue.
The flue exhaust, for indoor units 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 suitable 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 diox-
ide, % 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
heat generator attached. Multiple and combined
flues must be specially designed according to the
calculation method and requirements of the techni-
cal standards in force, by a professionally qualified
company. Chimney or flue sections for connection
of the flue exhaust pipe must comply with requisites
of technical standards in force.
