Baxi Luna 3 Silver Space Series Operating & Installation Instructions Manual page 63

Air adjustment for separate flues
Boiler
model
250 Fi
310 Fi
The 90° bend 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 bend combined with a duct or a 45° bend.
• A 90° bend reduces total duct length by 0.5 metres.
• A 45° bend reduces total duct length by 0.25 metres.
• The first 90° bend is not included when calculating the maximum available length.
Adjusting the air regulator for separate 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 flue duct,
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 CO2
in the fumes at maximum heat capacity,
and, if a lower value is measured, gra-
dually adjust the air regulator until the
amount of CO2 indicated in the following
table is measured.
To mount this device correctly, consult
the relative instructions.
INSTRUCTIONS FOR FITTERS
(L1+L2)
of adjuster
0 ÷ 12
12 ÷ 25
25 ÷ 40
0 ÷ 6
6 ÷ 20
20 ÷ 25
Flue duct adaptor
Connector
63
Position
G20
1
2 6,4
3
1
2 7,2
3
Air intake restrictor
Index
Opening
CO2 %
G31
7,2
8,0
Figure 9
925.523.1 - EN