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) as indicated below:
Access MENU 2 as described in section PARAMETERS SETTING.
• B Sitherm Pro B B 2720 B.
•
B On B.
•
B 2721 B.
•
B Natual gas or LPG B .
•
B 2720 B.
•
B OFF B.
•
C Boiler Settings B B 2441 B.
•
B B.
•
C Burner Control B.
•
B 9524 B.
•
B B.
•
B 9529 B.
•
B B.
When the gas change is completed the boiler data plate must be amended to indicate the new gas data.
TABLE 1: FAN SPEED PARAMETERS
PARAMETERS - rpm
2441 9529 9524
Boiler
model
Pmax heating Pmax DHW Pmin
G20 G31 G20 G31 G20 G31
33 5200 5100 7100 7000 1000 1250
24 4700 4400 6800 6500 1000 1500
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