Ariston MICROCOMBI 23 MFFI Manual de instruções de instalação - Página 20
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4.
GAS ADJUSTMENTS
CATEGORY II2H3+
Lower Wobbe Index (15°C;1013mbar)
Nominal Delivery Pressure
Minimum Delivery Pressure
23 MFFI
Main Burner: n. 12 jets (ø)
Consumption (15°C; 1013mbar)
Consumption (15°C; 1013mbar)
Gas Burner Pressure
max - min
[1 mbar = 10,197 mmc.a.]
4.1
C
HANGING THE
T
G
YPE OF
AS
Methane Gas
G20
MJ/m
3
h
45.67
mbar
20
mbar
17
mm
1.30
m
3
/h
2.78
Kg/h
----
mbar
11.0 - 2.0
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;
5. Adjust the soft-light feature;
6. Adjust the ignition delay feature for the heating system (can be set from 0
to 2 mins.).
CATEGORY II2H3+
Recommended Soft-
light Pressure
(mbar)
20
Liquid Butane Gas
Liquid Propane Gas
G30
80.58
29
20
0.77
----
2.02
27.7 - 6.0
Methane
Liquid
Gas
Butane
G20
Gas
G30
8.0
16.0
G31
80.58
37
25
0.77
----
2.00
35.5 - 7.3
Liquid
Propane
Gas
G31
16.0