Gas Valve Calibration; Gas Conversion - Beretta Mynute Green E 25 C.S.I. Manual Para El Instalador Y El Usuario

4.7 Adjustments
The boiler has already been adjusted by the manufacturer. However,
if adjustments must be repeated, for example after special mainte-
nance, replacement of the gas valve or conversion from methane gas
to LPG or propane air, observe the following procedures.
The adjustment of the maximum and minimum output, the maximum
heating and slow ignition, must be made strictly in the sequence indi-
cated, and by qualified personnel only:
1. disconnect the boiler power supply
2. turn the heating water temperature selector to its maximum, se-
lector in correspondence to + (fig. 42)
3. lift and then turn the instrument panel upside down
4. remove the electrical parts inspection cover, undoing the 2 fixing
screws
5. insert jumpers JP1 and JP3 (fig. 43)
6. power the boiler.
"ADJ" will appear on the display for about 4 sec
Modify the following parameters:
7. absolute/domestic maximum
8. minimum
9. maximum heating
10. slow ignition
as described below:
11. turn the heating water temperature selector to set the desired
value
12. press the CO button (fig. 44) and move on to calibration of the
next parameter.
Live electrical parts (230 Vac).
The following icons will appear on the display:
1. during absolute/domestic maximum calibration
2. during minimum calibration
3. during heating maximum calibration
4. during slow ignition calibration
End the procedure removing jumpers JP1 and JP3 to store the set
values.
the function can be terminated at any time without storing the set
values and maintaining the previously set ones:
removing jumpers JP1 and JP3 before all 4 parameters have been
set
- turning the mode selector to
- disconnecting the mains voltage.
- 15 minutes after activation.
The calibration does not entail the ignition of the boiler.
By rotating the heating setpoint selector knob, the number of
rotations expressed in hundreds (e.g. 25 = 2500 rpm) is auto-
matically displayed.
The calibration parameter display function is activated with the se-
lector on summer or winter and pressing the CO button on the card
regardless of whether or not there is a heat request.
The function cannot be activated if a remote control is connected.
When this function is activated, the calibration parameters each ap-
pear (in the order shown below) for 2 seconds. The relative icon is
indicated in line with each parameter, and the fan rotation value (ex-
pressed in hundreds)
1. Maximum
2. Minimum
3. Maximum heating
4. Slow ignition
5. Adjusted maximum heating

GAS VALVE CALIBRATION

- Electrically power the boiler.
- Open the gas tap.
- Set the mode selector to
- Remove the shell, turn the instrument panel upside down and re-
move the electrical parts inspection cover to access the "CO" but-
ton (fig. 45).
Press the "CO" button once.
Live electrical parts (230 Vac).
- Wait for the burner to ignite.
OFF/RESET.
OFF/RESET (display off).
"ACO" appears on the display. The boiler operates at maximum
heating output.
The "combustion analysis" function remains active for a limited
time of 15 minutes; if a delivery temperature of 90°C is reached the
burner will extinguish. It will reignite when this temperature drops
below 78°C.
- insert the analyser probes in the prescribed positions on the air box
after removing the screws and the cover.
- Press the "combustion analysis" button a second time to reach the
number of revolutions that corresponds to the maximum domestic
hot water output (table 1).
- Check the CO value: (table 4) if the value does not comply with
2
the indications in the table act on the gas valve max adjustment
screw (fig. 45).
- Press the "combustion analysis" button a third time to reach the
number of revolutions that corresponds to the minimum output (ta-
ble 2).
- Check the CO value: (table 5) if the value does not comply with
2
the indications in the table act on the gas valve min adjustment
screw (fig. 45).
- To exit the "combustion analysis" function turn the command knob.
- Extract the gases analysis probe and refit the plug.
- Close the instrument panel and reassemble the shell.
The "combustion analysis" function automatically deactivates if the
card generates an alarm. In the event of a fault during the combus-
tion analysis phase, carry out the reset procedure, acting on the
mode selector as described in section 4.4.
Table 1
Maximum
domestic hot
water fan gas (G20)
rotations
25 C.S.I.
30 C.S.I.
Table 2
Minimum number
of fan rotations gas (G20)
25 C.S.I.
30 C.S.I.
Table 3
Maximum number
of heating fan
gas (G20)
rotations
25 C.S.I.
30 C.S.I.
Table 4
Max CO
2
gas (G20)
25 C.S.I.
30 C.S.I.
Table 5
Min CO
2
gas (G20)
25 C.S.I.
30 C.S.I.
Table 6
Slow ignition
gas (G20)
25 C.S.I.
30 C.S.I.
4.8

Gas conversion

Conversion from a family gas to other family gas can be performed
easily also when the boiler is installed.
This operation must be carried out by professionally qualified per-
sonnel.
Mynute Green E C.S.I.
Methane Liquid gas
(G31)
47 47 rpm
56 56 rpm
Methane Liquid gas
(G31)
14 14 rpm
14 14 rpm
Methane Liquid gas
(G31)
39 39 rpm
47 47 rpm
Methane Liquid gas
(G31)
9.0 10.0 %
9.0 10.0 %
Methane Liquid gas
(G31)
9.0 10.0 %
9.0 10.0 %
Methane Liquid gas
(G31)
33 33 %
33 33 %
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