Gas Adjustments; Changing The Type Of Gas; Maintenance - Ariston A/23 MFFI Installation Instructions Manual

4.

GAS ADJUSTMENTS

CATEGORY II2H3+
Lower Wobbe Index (15°C;1013mbar)
Nominal Delivery Pressure
Minimum Delivery Pressure
A/23 MFFI
Main Burner: n. 13 jets (ø)
Consumption (15°C; 1013mbar)
Consumption (15°C; 1013mbar)
Gas Cock Outlet Pressure
min - max
A/27 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)
5.

MAINTENANCE

Supplied By www.heating spares.co Tel. 0161 620 6677
Methane Gas
G20
MJ/m 3 h
45.67
mbar 20
mbar 17
mm 1.,25
mc/h 2.72
Kg/h ----
mbar 11.4- 2.0
1.25
mc/h 3.16
Kg/h ----
mbar 11.6-2.2
(1mbar = 10,197 column 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 nomi-
nal 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.).
Methane Gas
G20
5-5.5
It is recommended that the following checks be made on the boiler at
least once a year:
1 - Check the seals for the water connections; replacement of any faulty seals.
2 - Check the gas seals; replacement of any faulty gas seals.
3 - Visual check of the entire unit.
4 - Visual check of the combustion process and cleaning of the burners if
needed.
5 - If called for by check no. 3, dismantling and cleaning of the combustion
chamber.
6 - If called for by check no. 4, dismantling and cleaning of the injectors.
7 - Visual check of the primary heat exchanger:
- check for overheating in the blade assembly;
- clean the exhaust fan if needed.
8 - Adjustment of the flow rate of the gas: flow rate for lighting, partial load and
full load.
Liquid Butane Gas
G30
80.58
30
20
0.72
----
2.02
27.5 (*) - 5.2
0.72
----
2.35
(*) - 4.8
Liquid Butane Gas Liquid Propane Gas
G30
17 - 18
Liquid Propane Gas
G31
70.69
37
25
0.72
----
2.02
35.0 (*) - 7.0
0.72
----
2.32
(*) - 6.0
G31
18 - 19
21