Adjustments; Gas Valve Calibration; Gas Conversion - Beretta CIAO GREEN Installer And User Manual

will not have the HEATING SET-POINT value available, but a value that you
can set as preferred between 15 and 25°C. The modifi cation of this value
will not directly modify the delivery temperature, but will automatically affect
the calculation that determines the value of that temperature, altering the
reference temperature in the system (0 = 20°C).
Boiler connected to a programmable timer (JUMPER JP6 inserted)
With the contact closed, the heat request is made by the delivery sensor, on
the basis of the external temperature, to obtain a nominal indoor tempera-
ture on DAY level (20°C). With the contact open, the boiler is not switched
off, but the weather curve is reduced (parallel shift) to NIGHT level (16°C).
This activates the night-time function. The delivery temperature is automati-
cally calculated by the boiler, although the user may modify the boiler set-
tings. Using the interface to modify the HEATING, you will not have the
HEATING SET-POINT value available, but a value that you can set as pre-
ferred between 25 and 15°C. The modifi cation of this value will not directly
modify the delivery temperature, but will automatically affect the calculation
that determines the value of that temperature, altering the reference tempera-
ture in the system (0 = 20°C for DAY level, and 16°C for NIGHT level).

4.7 Adjustments

The boiler has already been adjusted by the manufacturer during produc-
tion. If the adjustments need to be made again, for example after extraordi-
nary maintenance, replacement of the gas valve, or conversion from meth-
ane gas to LPG, observe the following procedures.
The adjustment of the maximum and minimum output, and of the maximum
and minimum heating and of slow switch-on, must be made strictly in the
sequence indicated, and only by qualifi ed personnel only:
- disconnect the boiler from the power supply
- turn the heating water temperature selector to its maximum
- loosen the fi xing screws (E) on the instrument panel (fi g. 14)
- lift then turn the instrument panel towards you
- loosen the fi xing screws on the cover (F) to access the terminal board (fi g. 16)
- insert the jumpers JP1 and JP3 (fi g. 40)
- power up the boiler
The three LEDs on the instrument panel fl ash 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 using a small screwdriver included (fi g. 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 val-
ues 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 15 minutes after it is connected.
Calibration can be carried out without powering up 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).
For 3CEp installations with dedicated accessory, it is necessary
change the setting of minimum fan speed according the accessory
instructions.
The function for visualizing the setting parameters is activated by the func-
tion 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
(OFF/RESET)

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 (fi g. 14)
- Loosen the fi xing screws on the cover (F) to access the terminal board
(fi g. 16)
- Using a small screwdriver included, press the CO button (fi g. 26)
Live electrical parts (230 V AC).
- Wait for burner ignition.
The display shows "ACO" and the yellow LED fl ashes. 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 (fi g. 41)
- 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); the yellow LED continues to fl ash while the red LED is fi xed
- 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 fl ash while the green LED is fi xed
- 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 fl ue gas probe and refi t the plug
- Close the instrument panel and refi t 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 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
4.8 Gas conversion (fi g. 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 qualifi ed 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 fi xing 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
- refi t 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
- refi t the air distribution box cover
(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
ENGLISH
rpm
rpm
rpm
%
%
11