Gas Adjustments; Changing The Type Of Gas - Ariston GENUS 23 MFFI Installation Instructions Manual

4.

GAS ADJUSTMENTS

CATEGORY II2H3+
Lower Wobbe Index (15°C;1013mbar)
Nominal Delivery Pressure
Minimum Delivery Pressure
23 MFFI
Main Burner: n. 13 jets (ø)
Consumption (15°C; 1013mbar)
Consumption (15°C; 1013mbar)
Gas Cock Outlet Pressure
max - min
27 MFFI - 27 RFFI System
Main Burner: n. 15 jets (ø)
Consumption (15°C; 1013mbar)
Consumption (15°C; 1013mbar)
Gas Cock Outlet Pressure:
max - min
30 MFFI
Main Burner: n. 15 jets (ø)
Consumption (15°C; 1013mbar)
Consumption (15°C; 1013mbar)
Gas Cock Outlet Pressure:
max - min
4.1 Changing the Type of
Gas
CATEGORY II2H3+
Recommended Soft-light Pressure
(mbar)
B004
Methane Gas
G20
MJ/m 3 h
mbar
mbar
mm 1.25
mc/h 2.72
Kg/h ----
mbar 11.4- 2.0
1.25
mc/h 3.16
Kg/h ----
mbar 11.4-2.0
1.30
mc/h 3.49
Kg/h ----
mbar 11.4-1.4
(1mbar = 10,197column of water)
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.
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;
Methane Gas
G20
5-5.5
Liquid Butane Gas
G30
45.67 80.58
20 30
17 20
0.72
----
2.02
27.5 (*) - 5.0
0.72
----
2.35
(*) - 5.0
0.77
----
2.60
(*) - 4.1
Liquid Butane Gas
G30
17 - 18
Liquid Propane Gas
G31
70.69
37
25
0.72
----
2.02
35.0 (*) - 7.0
0.72
----
2.32
(*) - 7.0
0.77
----
2.57
(*) - 5.6
Liquid Propane Gas
G31
18 - 19
25