Gas Conversion; Range Rated; Gas Valve Calibration - Beretta CIAO X 25C MTN Installer And User Manual

ƒ Check the analyser to ensure the min CO
indication given in the table. If the value is different, calibrate the gas
valve - see paragraph "4.10 Gas valve calibration".
METHANE GAS
CO min
2
(G20)
25C 9,0
30C 9,0
Make sure the flue gas temperature value, read in info I008 (see "5.3
INFO menu "), is coherent (with a tolerance ± 5°C) with the value
measured by the analyser.
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 custo-
mer'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 bur-
ner 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 generating 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.
4.9 Adjustments
The boiler has already been adjusted by the manufacturer. If the adjust-
ments 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 ignition must be made in the sequence indicated, and by qua-
lified personnel only:
ƒ power up the boiler
ƒ set the parameters
306 minimum fan speed
307 maximum fan speed
308 slow ignition
309 maximum fan speed for heating
313 ignition speed in restart
MAX. NO. FAN
METHANE GAS
ROTATIONS
CH - DHW 7.000 - 8.700
25C:
CH - DHW 6.900 - 8.300
30C:
MIN. NO. FAN
METHANE GAS
ROTATIONS
25C
30C
NO. FAN ROTATIONS
METHANE GAS
SLOW IGNITION
-
25C 30C
4.10

Gas valve calibration

Run the CO check procedure as explained in paragraph "4.8
2
Combustion 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 "3.7 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
and 2) - (minus) 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 with the casing open = 8,8%
2
ƒ value to be set for CO with the casing closed = 9,0%
2
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
value complies with the
2
LPG
(G31)
10,0
10,0
.
6 0 5
exit function
LPG
(G20) (G31)
6.900 - 8.500
6.800 - 7.900
LPG
(G20) (G31)
1.500 2.050
1.500 1.700
LPG
(G20) (G31)
5.500 5.500
to the value shown in the table (1
2
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
mum power, check the adjustment of the CO
again
ƒ after completing the adjustments, replace the casing and check the
CO corresponds to the value shown in the table 1 and 2.
% 2
%
CO +
2
Minimum output
adjustment
screw

4.11 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 "3.7 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
ƒ put the ramp of the gas valve back in place and screw the nut
ƒ reposition the previously removed components
ƒ power up the boiler and open the gas tap again.
Adjust the boiler as explained in paragraphs "4.9 Adjustments" and "4.10
Gas valve calibration".
b
Conversion must be carried out by qualified personnel
b
After the transformation, apply the new gas rating plate inclu-
ded in the kit.
b
After each intervention on the adjustment element of the gas
valve, seal it with sealing varnish.

4.12 Range rated

This boiler can be adapted to the heating requirements of the system,
in fact it is possible to set the maximum delivery for heating operation of
the boiler itself:
ƒ power up the boiler
ƒ set the parameter
310 Range rated
ƒ Set the maximum heating value (rpm) and confirm.
.
7 0 0
rpm
rpm
Record the new set value in the table on the back cover of this manual.
For subsequent controls and adjustments, refer to the set value.
b
The calibration does not entail the ignition of the boiler.
rpm
The boiler is supplied with the adjustments shown in the technical data
rpm
table. Depending on plant engineering requirements or regional flue gas
emission limits however, this value can be modified by referring to the
graph below.
rpm
9500
9000
8500
8000
7500
7000
6500
6000
5500 25C
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
0
0 2 4 6
12
2
at the maximum power
2
CO -
2
Maximum output
adjustment screw
MAX
rpm
7 0 0
confirm
Heat input curve - fan rotation
8 10 12 14 16 18 20 22
Heat input (kW)
value at the mini-
.
30C
24 26 28 30 32