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 5);
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
T
YPE OF
G
AS
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
21 RFFI
Main Burner: n. 12 jets (ø)
mm
Consumption (15°C; 1013mbar)
m
3
/h
Consumption (15°C; 1013mbar)
Kg/h
Gas Burner Pressure:
max - min
mbar
28 RFFI
Main Burner: n. 14 jets (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
2.4 - 1.05
----
8.5 - 1.7
1.30
3.15 -1.26
----
11.0 - 1.6
80.58
29
20
0.77
----
1.78 - 0.78
27.5 - 6.2
0.77
----
1.78 - 0.78
27.7 - 4.6
80.58
37
25
0.77
----
1.76 - 0.77
37.4 - 8.0
0.77
----
1.76 - 0.77
35.5 - 6.0
T
ABLE
5.1
The heating system must be emptied as follows:
- Turn off the boiler;
- Attach a hose pipe and open the drain valve;
- Empty the system at the lowest points (where present). When the heating
system is unused for an extended period of time, it is recommended that you
add antifreeze with an ethylene glycol base to the water in the
heating lines and radiators if the ambient temperature drops below 0°C during
the winter.
This makes repeated draining of the entire system unnecessary.
4.8
D
RAINING THE
S
YSTEM
