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– open one or more than one hot water tap
– press the button
>
to make the boiler operate at maximum
power "Hi" and check that the gas pressure values on the
pressure gauges correspond to those indicated in the table
below
– press the button
<
to make the boiler operate at minimum
power "Lo" and check that the gas pressure values on the
pressure gauges correspond to those indicated in the table
below. The message "Lo" will appear on the display together
with the flashing symbols (sun) and (snow)
– press the button
>
once again to make the boiler operate at
maximum power. If the gas pressure values are correct it is
possible to determine the combustion data and take a reading
of the combustion efficiency as provided for by legislation in
force
– press the button
s
to exit the "Chimney sweep Procedure".
The boiler water delivery temperature will appear on the dis-
play
– close the taps opened previously and check that the appliance
shuts down
– disconnect the pressure gauges, carefully close the pressure
points (6) and (7), put the control panel back to the original
position and refit the front panel (2).
Gas supply pressure
Type of gas
G20
Pressure (mbar)
20
Installation with SPLIT PIPE SYSTEM smoke outlet
Heat
Model
Output
Max
Brava One 25 BF
min
Max
Brava One 30 BF
min
Installation with CONCENTRIC smoke outlet
Heat
Model
Output
Max
Brava One 30 BF
min
If the gas pressure values are different from the values indicated
in the table, adjust the gas nozzle pressure as described in the
section below.
76
G30
G31
28-30
37
Pressure at nozzles (mbar)
G20
G30
G31
12,2 - 12,6
27,8 - 28,2
35,8 - 36,2
0,8 - 1,1
2,2 - 2,5
2,8 - 3,1
12,5 - 12,9
27,8 - 28,2
35,8 - 36,2
0,6 - 0,9
2,6 - 2,9
3,4 - 3,7
Pressure at nozzles (mbar)
G20
G30
G31
12,9 - 13,3
27,8 - 28,2
35,8 - 36,2
1,4 - 1,7
3,8 - 4,1
4,8 - 5,1
7.6.2
Adjusting gas pressure at the nozzles
m
CAUTION
Considering that:
– the front panel (2) has already been removed and
the point (6) is connected to the pressure gauge
– the main system switch must be set to "ON"
– the gas supply must be open
– there must be no current requests for heat ("Sum-
mer" mode
l
with hot water valve closed or "Win-
ter"
n
with air thermostats open)
– the adjustments described below must be carried out
in sequence.
Adjusting maximum gas pressure:
– turn the domestic hot water knob as far as it will go
– press and hold down the buttons
for approximately 6 seconds until the message "MA" appears
on the display alternating with "nu"
– open one or more than one hot water tap
– the boiler will start up and the message "P01" will appear on
the display (Adjusting maximum gas pressure)
– press the buttons
>
or
<
until the pressure value indicated in
the table appears on the pressure gauge
– once the value indicated in the table has been reached, press
the button
s
for approximately 2 seconds to confirm the value
which will then flash once.
Adjusting minimum gas pressure:
– press the button
o
twice, the message "P00" will appear on
the display
– press the buttons
>
or
<
until the pressure value indicated in
the table appears on the pressure gauge
– once the value indicated in the table has been reached, press
the button
s
for approximately 2 seconds to confirm the value
which will then flash once.
– press and hold down the buttons
for approximately 6 seconds until the water delivery temper-
ature appears on the display and the boiler shuts down/starts
up.
– close the valves which were opened previously.
EN
r
o
and
s
at the same time
o
and
s
at the same time
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