Ariston GENUS 23 MFFI - Gas Adjustments; Changing the Type of Gas

CATEGORY II2H3+ Methane Gas Liquid Butane Gas Liquid Propane Gas
G20 G30 G31
Recommended Soft-light Pressure
(mbar) 5-5.5 17 - 18 18 - 19
Lower Wobbe Index (15°C;1013mbar) MJ/m
3
h 45.67 80.58 70.69
Nominal Delivery Pressure mbar 20 30 37
Minimum Delivery Pressure mbar 17 20 25
23 MFFI
Main Burner: n. 13 jets (ø) mm 1.25 0.72 0.72
Consumption (15°C; 1013mbar) mc/h 2.72 ---- ----
Consumption (15°C; 1013mbar) Kg/h ---- 2.02 2.02
Gas Cock Outlet Pressure
max - min mbar 11.4- 2.0 27.5 (*) - 5.0 35.0 (*) - 7.0
27 MFFI - 27 RFFI System
Main Burner: n. 15 jets (ø) 1.25 0.72 0.72
Consumption (15°C; 1013mbar) mc/h 3.16 ---- ----
Consumption (15°C; 1013mbar) Kg/h ---- 2.35 2.32
Gas Cock Outlet Pressure:
max - min mbar 11.4-2.0 (*) - 5.0 (*) - 7.0
30 MFFI
Main Burner: n. 15 jets (ø) 1.30 0.77 0.77
Consumption (15°C; 1013mbar) mc/h 3.49 ---- ----
Consumption (15°C; 1013mbar) Kg/h ---- 2.60 2.57
Gas Cock Outlet Pressure:
max - min mbar 11.4-1.4 (*) - 4.1 (*) - 5.6
25
B004
The outlet pressure of the gas cock is obtained by completely loosening the
screw on the solenoid. The maximum pressure of the gas to the burner will be
equal to the nominal delivery pressure minus the head loss within the gas
valve.
4. GAS ADJUSTMENTS
(1mbar = 10,197column of water)
CATEGORY II2H3+ Methane Gas
G20
Liquid Butane Gas
G30
Liquid Propane Gas
G31
4.1 Changing the Type of
Gas
The boiler can be converted to use either methane (natural) gas (G20) or
LPG (G30 - G31) by an Authorised Service Centre.
The operations that must be performed are the following:
1. Replace the jets on the main burner (see table in section 4);
2. Adjust the maximum and minimum thermal capacity values for the boiler
(see table in section 4);
3. Replace the gas rating plate;
4. Adjust the maximum thermal power setting;