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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:
Check that the
/O
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.
Check that the
/O
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
OFFSET adjustment screw
K
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
9,1
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
described in section 14.
TABLE 2
P60*
Min. power
Boiler model
G20
G31
1550
1950
1.130
1550
1950
1800
2000
* value read on the boiler front panel display to multiply x 10 (e.g.: 150 corresponds to 1500
rpm)
7690785.01 (1-05/18)
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
10
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
5150
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
5,8
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
7704154
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