Baxi Nuvola 3 BS 40 Series Operating And Installation Instructions page 43

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.
N.B.:
The first 90° bend is not included when calculating the maximum available length.
The 90° curve allows the boiler to be connected to a flue-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° bend.
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
and, if a lower value is measured, gradually adjust the air regulator until the amount of CO
is measured.
To mount this device correctly, consult the relative instructions.
140 Fi
INSTRUCTIONS FOR FITTERS
length by 0.5 metres.
length by 0.25 metres.
in the fumes at maximum heat capacity,
2
connector
aperture
index
43
indicated in the following table
2
Figure 10
7113868.01 - en