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4.3.1 coaxial (concentric) inlet - outlet duct
This type of duct can be used to discharge fl ue gases and draw in air for
combustion both outside the building and in LAS-type fl ues.
The 90° coaxial bend enables connecting the boiler to the inlet - outlet
ducts in any direction since rotation is possible through 180°. It can also
be used as an additional bend in combination with the coaxial duct or
45° bend.
The boiler is supplied with a diaphragm for concentric pipes.
(*) The concentric diaphragm should only be inserted when the length
of the outlet duct is less than 1 metre.
When discharging outside, the inlet - outlet duct must protrude from the
wall by at least 18 mm to permit positioning the aluminium rose and
sealing it in order to prevent moisture getting inside.
max
reduction
reduction
fl ue
external
outlet duct length
in length
in length
terminal
duct
type of ducts
without terminal
to insert
to insert
diameter
diameter
90° bend
45° bend
coaxial
5 m
1 m
0,5 m
100 mm
100 mm
twin horizontally
10 m
0,5 m
0,25 m
-
80 mm
twin vertically
6 m
0,5 m
0,25 m
133 mm
80 mm
oce.9405030833
Joint
Diaphragm (concentric) (*)
Concentric union
Flexible sleeve
4.2 Gas connection
The gas installation and commissioning must be performed by a special-
ized technician in compliance with current regulations.
Connect the boiler gas supply pipe to the gas mains by means of a metal
pipe, inserting a stopcock upstream from the boiler.
The dimensions and height of the boiler’s gas pipe connection are given
in table I or II.
4.3 Installing the inlet - outlet ducts
SLIM
Fi forced fl ow gas boilers can be installed easily and fl exibly thanks
to the accessories supplied, which are described further on.
The boiler is originally fi tted for connection to a vertical or horizontal,
coaxial inlet - outlet duct. Thanks to the splitter accessory it is possible
to use separate ducts too.
Only accessories supplied by the manufacturer must be used for
installation!