16. GAS VALVE
This appliance does not require any mechanical adjustment on the valve. The system ensures electronic
auto-adaptation.
Pi
Gas supply pressure tap
Pout
Gas at burner pressure tap
16.1 GAS CONVERSION METHODS
Only an Authorised Technical Assistance Service can convert boiler operation from G20 to G31 gas or vice-versa. To calibrate, set
the board parameters (fan rpm - see TABLE 1
Access MENU 2 as described in section PARAMETERS SETTING.
B
Sitherm Pro
B
On
B.
B
2721
B
B
2720
B
OFF
C
B
B.
C
Burner Control
B
9524
B.
B
B.
B
9529
B.
B
B.
2441
Pmax
Boiler
Central Heating
model
G20
G31
33
5200
5100
24
4700
4400
1.32
6900
6500
1.24
6800
6500
1.18
6600
6100
1.12
4500
4400
7219836.01 (1-04/15)
B
B
2720
B.
B .
B.
B.
B
B
B.
PARAMETERS - rpm
9529
Pmax DHW
G20
G31
G20
7100
7000
1000
6800
6500
1000
6900
6500
1000
6800
6500
1000
6600
6100
1100
4500
4400
1100
B.
2441
B.
9524
Pmin
G31
1250
1500
1100
1500
1800
1650
50