Gas Valve Calibration; Range Rated - Beretta Mynute Green 25 B.S.I. E Installation And User Manual

ENGLISH
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 - fig. 7), remove the housing, then lower
the instrument panel towards you (fig. 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
included, press the CO button (fig. 9a).
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 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. 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 CO value: (table 3) if the value does not match the
2
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 CO value: (table 4) if the value does not match the
2
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 analysis cycle, carry out the reset procedure.
table 1
MAXIMUM NUMBER OF FAN
ROTATIONS
25 B.S.I. E heating - DHW
32 B.S.I. E heating - DHW
table 2
MINIMUM NUMBER OF FAN
ROTATIONS
25 B.S.I. E
32 B.S.I. E
table 3
MAXIMUM CO
2
25 B.S.I. E
32 B.S.I. E
table 4
MINIMUM CO
2
25 B.S.I. E
32 B.S.I. E
10
(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)
9,0 10,0
9,0 10,0
METHANE LIQUID
GAS (G20) GAS (G31)
9,5 10,0
9,5 10,0
table 5
SLOW IGNITION
25 B.S.I. E
32 B.S.I. E

RANGE RATED

This boiler can be adapted to the heating requirements of the
system, 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 rotating the heating setpoint selector knob, the value
expressed in hundreds (e.g. 25 = 2,500 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,
referring to the graphs below.
Mynute Boiler Green 25 B.S.I. E
6000
5500
5000
4500
4000
rpm
3500
rpm
3000
2500
2000
1500
rpm
1000
4 6 8
rpm
150
140
%
130
%
120
110
100
90
80
%
70
%
60
50
40
4 6 8
METHANE LIQUID
GAS (G20) GAS (G31)
3.400
3.400
HTG curve (Qnheating)
10 12 14 16 18 20
Heat output (kW)
COs.a. curve (Qnheating)
10 12 14 16 18 20
Heat output (kW)
3.400 rpm
3.400 rpm
22 24 26
22 24 26