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2.6 Flues connections
This is a "type C" sealed and forced draught appliance, and as such the air inlet and flue gas
outlet must be connected to one of the exhaust/intake systems indicated below. Using the
tables and the methods of calculation described, first verify, before installation, that the flues
do not exceed the maximum allowed length. The standards in force and local legislation must
be adhered to for terminal positions.
Restrictors
For the operation of the boiler, the restrictors supplied with the appliance must be fitted, according to
the indications shown in the tables below.
Choice of the restrictors using
concentric flue
Table 4a
Type
Length up to:
1 bend + 1 metre
60/100
1 bend + 3 metres
1 bend + 3 metres
80/125
1 bend + 4 metres
1 bend + 5 metres
Replacing the restrictor
To install or change the restrictor, remove the
fan unit, remove the flue gas connecting pipe 1
(as shown in Fig. 9a) and insert the diaphragm 2
(as shown in Fig. 9b).
N.B.: the diameter of
the
hole
stamped on the
restrictor
The Ø45 SYS restrictor is fitted as standard
on the boilers. Before inserting the flue gas
outlet pipe, check that the correct restrictor
is installed (when this needs to be used) and
correctly positioned.
14
Restrictor to be used
50 mm
No restrictor
45 mm
50 mm
No restrictor
is
Choice of the restrictors using 2
pipe system
Table 4b
Total calculated
flue lenght
Minimum
Maximum
0 m
10 m
10 m
20 m
20 m
35 m
35 m
45 m
fig. 9a
2
fig. 9b
SYS 10-23
Use restrictor
size
mm
45 m
47 m
50 m
No restrictor
1 1
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