Adjustments; Gas Valve Calibration; Gas Conversion - Beretta Ciao 25C Installer And User Manual

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Co
+
> 2 sec
The displayed value refers to the number of revolutions divided by 100.
ƒ Set the maximum rpm value.
.
7 0 0
The boiler works at the maximum power level.
ƒ Check the analyser to ensure the max CO
tion given in the table. If the value is different, calibrate the gas valve - see
paragraph "3.10 Gas valve calibration" .
CO max
2
25C f
30C f
ƒ Set the minimum rpm value
.
6 0 1
The boiler works at the minimum power level.
ƒ Check the analyser to ensure the min CO
tion given in the table. If the value is different, calibrate the gas valve - see
paragraph "3.10 Gas valve calibration " .
CO min
2
25C f
30C f
After completing the check:
ƒ quit the function by pressing
ƒ reposition the previously removed components
ƒ set the boiler to the required operating mode, depending on the season
ƒ regulate the heat request temperature values according to the customer's
needs.
b
When the combustion analysis function is active, all heat requests are
inhibited and the message "CO" appears on the display.
IMPORTANT
The combustion analysis function is active for max. 15 minutes; the burner
shuts down if a delivery temperature of 95°C is reached. It will ignite again when
the temperature falls below 75°C.
b
The combustion analysis function is usually carried out with the 3-way
valve on heating. The 3-way valve can be switched to DHW by genera-
ting a DHW request at the maximum output while the function itself is still
active. In this case, the DHW temperature will be limited to a maximum
value of 65°C. Wait for the burner to fire.
.
0 0 6
.
0 0 6
MAX
rpm
.
7 0 0
confirm
value complies with the indica-
2
METHANE LPG
GAS (G20) (G31)
9,0 10,0
9,0 10,0
.
6 0 1
MIN
rpm
confirm
value complies with the indica-
2
METHANE LPG
GAS (G20) (G31)
9,0 10,0
9,0 10,0
.
6 0 5
exit function
3.9

Adjustments

The boiler has already been adjusted by the manufacturer. If the adjustments
need to be made again however e.g. following extraordinary maintenance, after
the replacement of the gas valve, after conversion from methane gas to LPG
or vice versa, or after a new regulation for inside-chimney pipes, follow the
procedures described below.
The adjustment of the maximum and minimum output, maximum heating and slow
fan speed
ignition must be made in the sequence indicated, and by qualified personnel only:
in CH
ƒ power up the boiler
ƒ set the parameters
MAX
306
minimum fan speed
307 maximum fan speed
or
308 slow ignition
MIN
309 maximum fan speed for heating
MAX. NO. FAN
ROTATIONS
25C f CH - DHW
30C f CH - DHW
MIN. NO. FAN
ROTATIONS
25C f
30C f
NO. FAN ROTATIONS
SLOW IGNITION
25C f - 30C f

3.10 Gas valve calibration

% Run the CO check procedure as explained in paragraph "3.8 Combustion
2
analysis". If the values need to be modified, proceed as follows:
%
ƒ check the CO adjustment values with the casing closed
2
ƒ remove the casing as explained in paragraph "2.5 Removing the casing"
ƒ check the CO adjustment values again, with the casing open
2
ƒ on the basis of the difference in values with the casing closed and open, if
necessary bring the CO
the difference found. Example:
ƒ CO value measured with the casing closed = 8,5%
2
ƒ CO value measured with the casing open = 8,3%
2
ƒ value to be set for CO
ƒ value to be set for CO
ƒ to adjust the CO value:
2
ƒ rotate the max. power adjustment screw clockwise to reduce the value,
or anti-clockwise to increase it
ƒ rotate the min. power adjustment screw clockwise to increase the value,
or anti-clockwise to reduce it
ƒ with the casing open and after adjusting the CO
power, check the adjustment of the CO
ƒ after completing the adjustments, replace the casing and check the CO
corresponds to the value shown in the table 1 and 2.
%
%
CO -
2
Maximum output
adjustment screw
CO +
2
Maximum output
adjustment screw

3.11 Gas conversion

Conversion from the gas of one family to the gas of another family can be
done easily even when the boiler is already installed.
This operation must be carried out by professionally qualified personnel. The
boiler is designed to operate with methane gas (G20) or LPG (G31) according
to the product label. The boiler can be transformed to LPG or to methane gas
(G20) by means of special kits.
For disassembly refer to instructions below:
ƒ disconnect the boiler from the electricity supply and turn off the gas tap
ƒ remove the casing as explained in paragraph "2.5 Removing the casing"
ƒ release the instrument panel and rotate it forwards
ƒ unscrew the ramp nut from the gas valve and rotate the ramp so as to have
access to the gas nozzle (B) in the outlet fitting
ƒ remove the nozzle (B) and replace it with the one from the kit
11
METHANE GAS LPG
(G20) (G31)
7.000-8.700 6.900-8.500
7.400-8.700 7.400-8.700
METHANE GAS LPG
(G20) (G31)
1.500 2.050
1.500 1.700
METHANE GAS LPG
(G20) (G31)
5.500 5.500
to the value shown in the table (1 and 2) - (minus)
2
with the casing open = 8,8%
2
with the casing closed = 9,0%
2
value at the minimum
2
at the maximum power again
2
rpm
rpm
rpm
rpm
rpm
2