Gas Valve Calibration - Beretta MYNUTE BOILER GREEN 25 B.S.I. E Para El Instalador

The function for visualizing the setting parameters is activated by
the function selector in summer and in winter, by pressing the CO
button on the circuit board, either with or without request for heat.
This function cannot be activated when connected to a remote con-
trol.
Upon activating the function the setting parameters are visualized
in the order given below, each for 2 seconds. Each parameter is
displayed together with its corresponding icon and fan rotation
speed measured in hundreds
1. Maximum
2. Minimum
3. Max. heating
P
4. Slow ignition
5. Max. preset heating

GAS VALVE CALIBRATION

- Connect the boiler to the power supply
- Open the gas tap
- Set the function selector to
- Loosen the screws (A), remove the housing, then lower the in-
strument panel towards you (fig. 7-8)
- unscrew the two screws of the small cover on the electronic
board to have access to the terminals
- while the boiler is powered up, using a small screwdriver includ-
ed, press the CO button (fig. 9).
Live electrical parts (230 Vac).
- Wait for burner ignition.
The boiler operates at maximum heat output.
The "combustion analysis" function remains active for a limited
time (15 min); if a delivery temperature of 90°C is reached, the
burner is switched off. It will be switched back on when this tem-
perature drops below 78°C.
- Insert the analyser probe in the ports provided in the air distribu-
tion box, after removing the screws from the cover (fig. 19)
- Press the "combustion analysis" button a second time to reach
the number of rotations corresponding to the maximum domestic
hot water output (table 1)
- Check the CO2 value: (table 3) if the value does not match the
value given in the table, use the gas valve maximum adjustment
screw
- Press the "combustion analysis" button a third time to reach the
number of rotations corresponding to the minimum output (table
2)
- Check the CO2 value: (table 4) if the value does not match the
value given in the table, use the gas valve minimum adjustment
screw
- To exit the "combustion analysis" function, turn the control knob
- Remove the flue gas probe and refit the plug
- Close the instrument panel and refit the housing.
The "combustion analysis" function is automatically deactivated if
the board triggers an alarm. In the event of a fault during the com-
bustion analysis cycle, carry out the reset procedure.
table 1
MAXIMUM NUMBER OF FAN
ROTATIONS
25 B.S.I. heating - DHW
32 B.S.I. heating - DHW
table 2
MINIMUM NUMBER OF FAN
ROTATIONS
25 B.S.I.
32 B.S.I.
table 3
MAXIMUM CO
2
25 B.S.I.
32 B.S.I.
(OFF/RESET) (monitor off)
METHANE LIQUID
GAS (G20) GAS (G31)
5.600 5.600
5.200-6.300 5.200-6.300
METHANE LIQUID
GAS (G20) GAS (G31)
1.700 1.700
1.600 1.600
METHANE LIQUID
GAS (G20) GAS (G31)
9 10
9 10
table 4
MINIMUM CO
25 B.S.I.
32 B.S.I.
RANGE RATED
This boiler can be adapted to the heating requirements of the sys-
tem, in fact it is possible to set the maximum delivery for heating
operation of the boiler itself:
- switch off the power supply
- setting the heating water temperature selector at the maximum
value
- remove the shell
- turning the instrument panel towards you
- unscrew the two screws of the small cover on the electronic
board to have access to the terminals
- insert JP1 jumper
- power up the boiler
The display shows "ADJ" for about 4 sec.: it is then possible to
change the maximum heating value by means of the heating water
temperature selector and the CO button in order to set and confirm
the desired value.
The icon .will appear on the display.
Finish the procedure by removing the jumper JP1 to store the set
values.
Once the desired output (maximum heating) has been set, note the
value on the table on the back cover.
For subsequent controls and adjustments, refer to the set value.
The calibration does not entail the ignition of the boiler. By ro-
tating the heating setpoint selector knob, the value expressed
in hundreds (e.g. 25 = 2500 rpm) is automatically displayed.
The boiler is supplied with the adjustments shown in the table.
Depending on plant engineering requirements or regional flue gas
emission limits it is, however, possible to modify this value, refer-
ring to the graphs below.
rpm
rpm
rpm
rpm
%
%
Mynute Boiler Green B.S.I. E
METHANE LIQUID
GAS (G20) GAS (G31)
2
9,5
9,5
10 %
10 %
11