Checking The Combustion Parameters - Beretta Ciao Green 25 R.S.I. Manual De Instalacion Y Uso

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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)
- Using a small screwdriver included, press the CO button (fig. 26)
Live electrical parts (230 V AC).
- Wait for burner ignition.
The display shows "ACO". 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. 40)
- Press the "combustion analysis" button a second time to reach the num-
ber 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 value
2
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 value
2
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
heating - DHW
table 2
MINIMUM NUMBER OF
FAN ROTATIONS
table 3
Max. CO
2
table 4
Min. CO
2
table 5
SLOW IGNITION
4.7 Gas conversion (fig. 41-42)
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)
(OFF/RESET) (monitor off)
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
METHANE LIQUID GAS
GAS (G20) (G31)
40 40
- 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.

4.8 Checking the combustion parameters

- Position the function selector on
- Turn the DHW temperature selector on
Wait until the ignition of the burner (about 6 seconds). The display shows
"ACO", the boiler operates at full power heating.
- Remove the screw C and the cover E on the air box (fig. 40).
- Insert the probes of the analyzer in the positions provided on the air box.
The flue gas analysis probe must be fully inserted as far as
possible.
- Check that the CO
shown is different, change it as indicated in the chapter entitled "Gas
valve calibration".
Max. CO
2
Min. CO
2
- Perform the combustion check.
- Check the flue combustion.
rpm
The "combustion analysis" remains active for a time limit of 15 min; in the
event it is reached in a flow temperature of 90 °C the burner shutdown.
It will turn back when this temperature falls below 78 °C.
If you wish to stop the process turn the hot water temperature in the area
between the "+" and "-".
Then:
rpm
- remove the analyser probe and close the sockets for combustion analy-
sis with the special screw
- close the instrument panel and refit the housing.
5 MAINTENANCE
%
The appliance must be systematically controlled at regular intervals to
make sure it works correctly and efficiently and conforms to legislative pro-
visions in force.
The frequency of controls depends on the conditions of installation and
usage, it being anyhow necessary to have a complete check carried out by
authorized personnel from the Servicing Centre every year.
%
- Check and compare the boiler's performance with the relative specifica-
tions.
Any cause of visible deterioration must be immediately identified and
eliminated.
- Closely inspect the boiler for signs of damages or deterioration, particu-
larly with the drainage and aspiration system and electrical apparatus.
rpm
- Check and adjust – where necessary – all the burner's parameters.
- Check and adjust – where necessary – the system's pressure.
- Analyze combustion. Compare results with the product's specification.
Any loss in performance must be identified and corrected by finding and
eliminating the cause.
- Make sure the main heat exchanger is clean and free of any residuals or
obstruction.
- Check and clean – where necessary – the condensation tray to make
sure it works properly.
After routine and extraordinary maintenance operations have
been carried out, fill the siphon, following the instructions in
the section "First commissioning".
IMPORTANT: always switch off the power to the appliance and close the
gas by the gas cock on the boiler before carrying out any maintenance and
cleaning jobs on the boiler.
to switch off the boiler.
.
values match those given in the table, if the value
2
METHANE LIQUID GAS
GAS (G20)
9,0
METHANE LIQUID GAS
GAS (G20)
9,5
ENGLISH
(G31)
10,5 %
(G31)
10,5 %
11