Beretta JUNIOR GREEN 25 C.S.I. Manual De Instalacion Y Uso página 11

Using the interface to modify the HEATING, you will not have the HEAT-
ING SET-POINT value available, but a value that you can set as preferred
between +5 and -5°C.
The modification of this value will not directly modify the delivery tempera-
ture, but will automatically affect the calculation that determines the value
of that temperature, altering the reference temperature in the system (0 =
20°C for DAY level, and 16°C for NIGHT level).
4.6 Adjustments
The boiler has already been adjusted by the manufacturer during produc-
tion. If the adjustments need to be made again, for example after extraor-
dinary maintenance, replacement of the gas valve, or conversion from
methane gas to LPG, observe the following procedures.
The adjustment of the maximum and minimum output, and of the maxi-
mum and minimum heating and of slow switch-on, must be made strictly in
the sequence indicated, and only by qualified personnel only:
- disconnect the boiler from the power supply
- turn the heating water temperature selector to its maximum (fig. 38)
- loosen the fixing screws (E) on the instrument panel (fig. 14)
- lift then turn the instrument panel towards you
- loosen the fixing screws on the cover (F) to access the terminal board
(fig. 16)
- insert the jumpers JP1 and JP3 (fig. 39)
- power up the boiler
The three LEDs on the instrument panel flash simultaneously and the dis-
play shows "ADJ" for approximately 4 seconds
Next change the following parameters:
1 - Domestic hot water/absolute maximum
2 - Minimum
3 - Heating maximum
4 - Slow switch-on
as follows:
- turn the heating water temperature selector to set the required value
- press the CO button (fig. 26) and then skip to the calibration of the next
parameter.
Live electrical parts (230 V AC).
The following icons light up on the monitor:
1. during domestic hot water/absolute maximum calibration
2. during minimum calibration
3. during heating maximum calibration
4. during slow switch-on calibration
End the procedure by removing jumpers JP1 and JP3 to store these set
values in the memory.
THE function can be ended at any time without storing the set values in the
memory and retaining the original values as follows:
- remove jumpers JP1 and JP3 before all 4 parameters have been set
- set the function selector to
- cut the power supply
- waiting for 15 minutes after it is connected.
Calibration can be carried out without switch on the boiler.
By turning the heating selection knob, the monitor automatically
shows the number of rotations, expressed in hundreds (e.g. 25 =
2,500 rpm).
GAS VALVE CALIBRATION
- Connect the boiler to the power supply
- Open the gas tap
- Set the function selector to
- Loosen the screws (E), remove the housing, then lower the instrument
panel towards you (fig. 14)
- Loosen the fixing screws on the cover (F) to access the terminal board
(fig. 16)
- Press the CO button (fig. 26)
Live electrical parts (230 V AC).
- Wait for burner ignition.
The display shows "ACO" and the yellow LED flashes. The boiler oper-
ates 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 temperature drops below 78°C.
- Insert the analyser probe in the ports provided in the air distribution box,
after removing the screws from the cover (fig. 40)
- Press the "combustion analysis" button a second time to reach the
number of rotations corresponding to the maximum domestic hot water
output (table 1); the yellow LED continues to flash while the red LED is
fixed
- 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
(OFF/RESET)
(OFF/RESET) (monitor off)
- Press the "combustion analysis" button a third time to reach the number
of rotations corresponding to the minimum output (table 2); the yellow
LED continues to flash while the green LED is fixed
- 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 combustion anal-
ysis cycle, carry out the reset procedure.
table 1
MAXIMUM NUMBER OF
FAN ROTATIONS
heating - DHW
table 2
MINIMUM NUMBER OF
FAN ROTATIONS
table 3
Max. CO
2
table 4
Min. CO
2
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, referring to the graphs below.
HTG curve (Qnheating) - 25kW
6400
6000
5600
5200
4800
4400
4000
3600
3200
2800
2400
2000
1600
1200
4 6 8 10
COs.a. curve (Qnheating) - 25kW
200
190
180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
4 6 8 10
METHANE LIQUID GAS
GAS (G20) (G31)
49 - 61 49 - 61
METHANE LIQUID GAS
GAS (G20) (G31)
14 14
METHANE LIQUID GAS
GAS (G20) (G31)
9.0 10.5
METHANE LIQUID GAS
GAS (G20) (G31)
9.5 10.5
12 14 16 18 20 22
Heat output (kW)
12 14 16 18 20 22
Heat output (kW)
ENGLISH
rpm
rpm
%
%
24 26
24 26
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