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15. GAS VALVE CALIBRATION
To calibrate the gas valve, enable the calibration function as described in section
12.2 and carry out the following operations:
1) Calibrating MAXIMUM heat output.
Check that the
/O
measured on the flue duct, with the boiler operating
2
at maximum heat capacity, matches that indicated in table 1C. If it does not,
remove the threaded cap on the gas valve and turn the adjustment screw (V).
Turn the screw clockwise to decrease the level of
increase it.
2) Calibrating REDUCED heat output
Check that the
/O
measured on the flue duct, with the boiler operating at
2
minimum heat capacity, matches that indicated in table 1C. If it does not, remove
the threaded cap on the gas valve and turn the adjustment screw (K). Turn the
screw clockwise to increase the level of
V
Gas flow adjustment screw
K
OFFSET adjustment screw
For each CO
/O
value found at the maximum thermal capacity, there is a
2
2
range of CO
/O
values at the minimum thermal capacity shown in the same
2
2
line of the table.
The nominal calibration values of the gas valve for each type of gas used are shown in bold.
The CO
/O
values are with the cover closed.
2
2
The maximum permitted CO value must be lower than 250 ppm.
TABLE 1C
G20
CO
(%)
O
2
P max
P min
P max
9,7
8,8÷9,2
3,6
9,6
8,7÷9,1
3,8
9,5
8,6÷9
3,9
9,4
8,5÷8,9
4,1
9,3
8,4÷8,8
4,3
9,2
8,3÷8,7
4,5
9,1
8,2÷8,6
4,7
9
8,1÷8,5
4,8
8,9
8÷8,4
5
8,8
7,9÷8,3
5,2
8,7
7,8÷8,2
5,4
15.1 GAS CONVERSION
To convert operation with methane gas (G20) to operation with propane gas
(LPG), first replace the nozzle (A) as shown in the figure and then calibrate
the gas valve as described above. Afterwards, make sure there are no gas
leaks. Modify the parameters (fan rpm) as indicated in table 2 following the procedure
described in section 14.
TABLE 2
P60*
Min. power
Boiler model
G20
G31
1.115
1550
1950
1.130
1550
1950
1.150
1800
2000
* value read on the boiler front panel display to multiply x 10 (e.g.: 150 corresponds to 1500
rpm)
To simplify calibration of the gas valve, set the "calibration function" directly
on the boiler control panel as described in section 12.2.
For cascade ducts, change the parameter P60 (see table 1B in chapter 10.3).
7690785.01 (2-07/18)
and anticlockwise to decrease it.
Pi
Gas supply pressure tap
(%)
CO
(%)
2
2
P min
P max
P min
4,5÷5,2
10,5
10÷10,4
4,7÷5,4
10,4
9,9÷10,3
4,8÷5,6
10,3
9,8÷10,2
5÷5,7
10,2
9,7÷10,1
5,2÷5,9
10,1
9,6÷10
5,4÷6,1
10
9,5÷9,9
5,6÷6,3
9,9
9,4÷9,8
5,7÷6,5
9,8
9,3÷9,7
5,9÷6,6
9,7
9,2÷9,6
6,1÷6,8
9,6
9,1÷9,5
6,3÷7
9,5
9÷9,4
PARAMETERS - rpm
P30 - P61 *
P59*
Max. power
Ignition power
G20 - G31
G20
5500
2500
5800
2500
6900
2500
and anti-clockwise to
G31
O
(%)
2
P max
P min
4,9
5,1÷5,7
5,1
5,2÷5,8
5,2
5,4÷6
5,4
5,5÷6,1
5,5
5,7÷6,3
5,7
5,8÷6,4
5,8
6÷6,6
6,0
6,1÷6,7
6,1
6,3÷6,9
6,3
6,4÷7,1
6,4
6,6÷7,2
GAS NOZZLE
Ø (mm)
G31
G20
G31
2700
12
11
2700
12
11
2700
12
11
40
7704153
A
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