79
71.03982.03 - EN
INSTALLATION INSTRUCTIONS
… SEPARATE FLUE AND AIR DUCTS
This type of installation makes it possible to discharge exhaust fumes both outside the building and into single lue ducts.
Comburent air can be drawn in at a different location from that of the lue terminal. The splitting kit comprises a lue duct
adaptor (100/80) and an air duct adaptor. For the air duct adaptor, it the screws and seals previously removed from the cap.
The 90° curve allows the boiler to be connected to a lue-air duct in any direction as it can be rotated by 360°. It can also
be used as a supplementary curve combined with a duct or a 45° curve.
• A 90° curve reduces total duct length by 0.5 metres.
• A 45° curve reduces total duct length by 0.25 metres.
The first 90° curve is not considered when calculating the maximum available length.
Boiler model
(L1+L2)
Position
of air regulator
CO
2
%
G20
G31
24 MI FF
24 FF
0 ÷ 4
1
7,2
8
4 ÷ 18
2
18 ÷ 30
3
Adjusting the air regulator for sepa-
rate flues
This regulator must be adjusted to
optimise combustion efficiency and
parameters.
After turning the air intake connecter,
which can be mounted both to the right
and the left of the exhaust lue duct,
suitably adjust the excess air according
to the total length of the combustion
exhaust and inlet lue ducts.
Turn this regulator anticlockwise to de-
crease the excess of comburent air and
vice-versa to increase it.
To ine tune, use a combustion product
analyser to measure the amount of CO
2
in the fumes at maximum heat capacity,
and, if a lower value is measured, gra-
dually adjust the air regulator until the
amount of CO
2
indicated in the following
table is measured.
To mount this device correctly, consult
the relative instructions
.
Figure 8
0809_0201 / CG_2045
Flue duct adaptor
Connector
Air intake restrictor
1
2
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