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– 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
y
to exit the "Chimney sweeper Proce-
dure". The boiler water delivery temperature will appear on
the display
– 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 po-
sition and refit the front panel (2).
Gas supply pressure
Type of gas
G20
Pressure (mbar)
20
Installation with SPLIT PIPE SYSTEM smoke outlet
Heat Out-
Model
put
Max
12,2 - 12,6
Brava Slim
25 BF
min
0,8 - 1,1
Max
12,5 - 12,9
Brava Slim
30 BF
min
0,6 - 0,9
Max
10,4 - 10,8
Brava Slim
40 BF
min
0,5 - 0,8
Installation with CONCENTRIC smoke outlet
Heat Out-
Model
put
Max
12,5 - 12,9
Brava Slim
25 BF
min
1,7 - 2,0
Max
12,9 - 13,3
Brava Slim
30 BF
min
1,4 - 1,7
Max
11,2 - 11,6
Brava Slim
40 BF
min
0,8 - 1,1
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.
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.
G30
G31
28-30
37
Pressure at nozzles (mbar)
G20
G30
G31
27,8 - 28,2
35,8 - 36,2
2,2 - 2,5
2,8 - 3,1
27,8 - 28,2
35,8 - 36,2
2,6 - 2,9
3,4 - 3,7
26,8 - 27,2
34,8 - 35,2
1,2 - 1,5
2,0 - 2,3
Pressure at nozzles (mbar)
G20
G30
G31
27,8 - 28,2
35,8 - 36,2
3,1 - 3,4
3,9 - 4,2
27,8 - 28,2
35,8 - 36,2
3,8 - 4,1
4,8 - 5,1
26,8 - 27,2
34,8 - 35,2
2,4 - 2,7
2,9 - 3,2
Adjusting maximum gas pressure:
– press button
r
and set the DOMESTIC HOT WATER SET to
maximum using the button
>
– 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
y
for approximately 2 seconds to confirm the val-
ue which will then flash once.
Adjusting minimum gas pressure:
– press the button
r
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
y
for approximately 2 seconds to confirm the val-
ue which will then flash once.
– press and hold down the buttons
for approximately 6 seconds until the water delivery tempera-
ture appears on the display and the boiler shuts down/starts up
– close the valves which were opened previously.
>
and
y
at the same time
>
and
y
at the same time
77
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