Checking The Combustion Parameters - Beretta CIAO GREEN 25 C.S.I. Manual De Instalacion Y Uso

By turning the heating selection knob, the monitor automatically
shows the number of rotations, expressed in hundreds (e.g. 25 =
2,500 rpm).
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 control.
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 (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. 41)
- Press the "combustion analysis" button a second time to reach the num-
ber of rotations corresponding to the maximum domestic hot water out-
put (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
- 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
25 C.S.I. heating - DHW
29 C.S.I. heating - DHW
table 2
MINIMUM NUMBER OF
FAN ROTATIONS
table 3
Max. CO
2
table 4
Min. CO
2
(OFF/RESET) (monitor off)
METHANE LIQUID GAS
GAS (G20) (G31)
49 - 61 49 - 61
53 - 62 52 - 60
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
4.8 Gas conversion (fig. 42-43)
Gas conversion from one family of gases to another can also be easily
performed when the boiler is installed.
This operation must be carried out by professionally qualified personnel.
The boiler is designed to operate with methane gas (G20) according to the
product label.
It is possible to convert the boiler to propane gas, using the special kit.
For disassembly, refer to the instructions below:
- switch off the power supply to the boiler and close the gas tap
- remove in sequence: housing and air distribution box cover
- remove the fixing screw from the instrument panel
- unhook and turn the instrument panel forwards
- remove the gas valve (A)
- remove the nozzle (B) inside the gas valve and replace it with the nozzle
from the kit
- refit the gas valve
- remove the silencer from the mixer
- open the two half-shells by prising apart the corresponding hooks (C)
- replace the air diaphragm (D) in the silencer
- refit the air distribution box cover
- re-power the boiler and turn on the gas tap
Adjust the boiler as described in the chapter entitled "Adjustments" with
reference to the information on LPG.
Conversion must be carried out by qualified personnel.
Once the conversion is complete, affix the new identification
label supplied in the kit.

4.9 Checking the combustion parameters

To carry out the combustion analysis, proceed as follows:
- set the main switch of the installation to the "OFF" position
- loosen the fixing screws (D) on the housing (fig. 13)
- move the base of the housing forwards and then upwards to unhook it
from the chassis
- 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)
- Press the "CO" button (fig. 26)
Live electrical parts (230 V AC).
- Wait for burner ignition. The display shows "ACO", the yellow LED flash-
es and the boiler operates at maximum heat output.
- insert the analyser probe in the ports provided in the air distribution box,
after removing the screws from the cover (fig. 41)
- check that the CO2 values match those given in the table, if the value
shown is different, change it as indicated in the chapter entitled "Gas
valve calibration".
- perform the combustion check.
Then:
- remove the analyser probe and close the sockets for combustion analy-
sis with the special screw
- close the instrument panel and refit the housing
The flue gas analysis probe must be fully inserted as far as
possible.
IMPORTANT
Even during the combustion analysis phase, the function that switches the
boiler off when the water temperature reaches the maximum limit (about
rpm
90°C) remains enabled.
rpm
rpm
%
%
ENGLISH
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