Ariston EURO COMBI A/27 MFFI Manuale di istruzioni per l'installazione - Pagina 22
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4.1
Changing the Type of
Gas
CATEGORY II2H3+
Recommended Soft-Light Pressure
(mbar)
5.
MAINTENANCE
22
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
5. Adjust the soft-light feature;
6. Adjust the ignition delay feature for the heating system (can be set from
0 to 2 mins.).
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.
9 - Check of the heating safety systems:
- safety device for maximum temperature;
- safety device for maximum pressure.
10 - Check of the gas safety systems:
- safety device for lack of gas or flame (detection electrode);
- safety device for gas cock.
11 - Check of the electrical connection (make sure it complies with the
instructions in the manual).
12 - Check of domestic hot water production efficiency (delivery rate and tem-
perature)
13 - Check of the general performance of the unit.
14 - General check of the discharge/ventilation of the combustion by-
products.
Liquid Butane Gas
G30
17 - 18
Liquid Propane Gas
G31
18 - 19
B023