Immergas C9 Notice D'instructions page 11

Technical data.
- The dimensions of the cavity must guarantee
a minimum gap between the external wall of
the duct and the internal wall of the cavity: 30
mm for cavity with circular section and 20 mm
for cavity with square section (Fig. 2).
A
B
The representation of the boiler is an example, as this kit adapts
to various boiler models and the installation possibilities are
different according according to the place where the same will be
installed.
- A maximum of 2 direction changes are allowed
on the vertical tract of the flue extraction
elements with a maximum angle of incidence
of 30° with respect to vertical.
Ø 80 Rigid Ducting
(A) mm
86
Ø 80 Flexible Ducting
A
(A) mm
C
90
Fig. 2
CAVITY CAVITY
(B) mm (C) mm
126 146
CAVITY CAVITY
(B) mm (C) mm
130 150
11
- The maximum vertical extension using a Ø
80 ducting system is 28 m, the maximum
extension includes 1 Ø 60/100 adapter at
80/125, 1 x 87° bend Ø 80/125, 1 m of 80/125
pipe horizontally, 1 90° bend ducted and the
roof terminal for ducting.
To determine the C93 flue system in
configurations different to that just described
(Fig. 3), consider the following head losses:
- 1 m Ø 80/125 concentric pipe = 1 m of
ducted pipe;
- 1 x 87° bend = 1.4 m ducted pipe;
As a consequence, subtract the equivalent
length of the detail added to the 28 m available.
Fig. 3