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It is recommended that the following inspections be carried out on the boiler at
least once a year:
1 - Check the seals for the water connections; replace any faulty seals.
2 - Check the gas seals; replace any faulty gas seals.
3 - Visual check of the entire unit.
4 - Visual check of the combustion process or analysis of combustion by-products
(see section 4.5) and cleaning of the burner if needed.
5 - If called for by point. 3, dismantling and cleaning of the combustion chamber.
6 - If called for by point. 4, dismantling and cleaning of the burner jets.
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 (overheat thermostat);
- safety device for maximum pressure (safety valve).
10- Check of the gas safety systems:
- safety device for lack of gas or flame ionisation (detection electrode);
- safety device for gas cock.
11- Check of the electrical connection (make sure it complies with the instructions
in the manual).
12- General check of the combustion by-products of the discharge/ventilation system.
13- Check of the general performance of the unit.
6. MAINTENANCE
19
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 5);
2. Pay attention to put the gas restrictor if convert the boiler from NG to
GPL and to take it out when pass from LPG to NG;
2. Adjust the maximum and minimum thermal capacity values for the boiler
(see table in section 5);
3. Replace the gas rating plate;
4. Adjust the maximum thermal power setting;
5. Adjust the soft-light feature (open the cover of the regulation screw on the
gas valve (see F
IG. 5.1). Rotate clockwise from min. to max. as per
installation requirements).
5.1 C
HANGING THE
TYPE OF GAS
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.
[1 mbar = 10,197 mmc.a.]
5. GAS ADJUSTMENTS
Lower Wobbe Index (15°C;1013mbar) MJ/m
3
h
Nominal Delivery Pressure mbar
Minimum Delivery Pressure mbar
15 RFFI
Main Burner: n. 8 jets (ø)mm
Restrictor ø
Consumption (15°C; 1013mbar) m
3
/h
Consumption (15°C; 1013mbar) Kg/h
Gas Burner Pressure:
max - min mbar
CATEGORY II2H3+ Methane Gas
G20
Liquid Butane Gas
G30
Liquid Propane Gas
G31
45.67
20
17
1.30
---
1.62
----
8.5
80.58
29
20
0.77
3.3
----
1.21
22.1
80.58
37
25
0.77
3.3
----
1.19
28.8
VG002Ab
TABLE 5.1
F
IG. 5.1