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For detailed installation instructions, consult the technical data provided with the accessories.
... separate flue and air ducts
This type of installation makes it possible to discharge exhaust fumes both outside the building and into single flue ducts.
Comburent air can be drawn in at a different location from that of the flue terminal. The splitting kit comprises a flue duct
adaptor (100/80) and an air duct adaptor. For the air duct adaptor, fit the screws and seals previously removed from the cap.
Remove the diaphragm in the boiler if these types of flue ducts are used.
Figure 9
- A 90° bend reduces the total duct length by 0.5 metre.
- A 45° bend reduces the total duct length by 0.25 metre.
Adjusting the air regulator for separate flues
This regulator must be adjusted to optimise combustion efficiency and parameters.
After turning the air intake connecter, suitably adjust the excess air according to the total length of the combustion exhaust
and inlet flue ducts.
Turn this regulator clockwise to decrease the excess of comburent
air and vice-versa to increase it.
To fine tune, use a combustion product analyser to measure the
amount of CO
in the fumes at maximum heat capacity, and, if a
2
lower value is measured, gradually adjust the air regulator until
the amount of CO
indicated in the following table is measured.
2
To mount this device correctly, consult the relative instructions.
NUVOLA 140 Fi
INSTRUCTIONS FOR FITTERS
N.B.:
ded when calculating the maximum
available length.
The 90° curve allows the boiler to be
connected to a flue-air duct in any direc-
tion as it can be rotated by 360°. It can
also be used as a supplementary curve
combined with a duct or a 45° curve.
Models 240 -280
Index
Opening
19
The first 90° curve is not inclu-
Model 320
Intake coupling
Figure 10
7864176 - en
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