29
INST
ALLER Section
(en)
7217473.07 (1-11/17)
11. GAS VALVE AND ELECTRONIC BOARD
11.1 GASCONVERSION
The Technical Assistance Service can convert this boiler to natural gas (G20) or LPG (G31). Carry out the following operations:
A)
replace the main burner injectors;
B)
parameterise the electronic board;
C)
mechanically calibrate the gas valve pressure regulator;
D)
final checks.
A) Replace the main burner injectors
•
Disconnect the boiler from the power supply;
• close the gas inlet valve;
• remove the front panel of the boiler;
•
replace the ramp injectors making sure to fully tighten them to prevent gas leaks. Injector diameters are specified in the burner
injector-pressure table.
• open the gas inlet valve and make sure there are no gas leaks.
B) Parameterise the electronic board
•
Power the boiler;
•
set the parameters (Fxx) with the values indicated in the following table, depending on the gas type following the procedure
described in the SETTING PARAMETERS section.
24 - 1.24
G20
G31
G25.1
F02
0
1
2
C) Mechanically calibrate the gas valve pressure regulator
•
Connect the positive pressure test point of a pressure gauge, possibly water-operated, to the
gas valve pressure test point (
Pb
);
•
open the gas tap and switch the boiler to the "Winter" mode;
•
open a hot water tap that can provide a flow rate of at least 10 litres a minute or make sure
there is maximum heat demand;
C1)
Adjust to nominal heat output:
• remove the modulator cover;
•
• adjust the tube brass screw (
a
) until the pressure values shown in the burner injector-pressure
table correspond to the nominal heat output;
• make sure that the dynamic inlet pressure of the boiler, measured at the gas valve pressure
test point (
Pa
) is correct, as indicated in the TECHNICAL SPECIFICATIONS section.
C2)
Adjust to reduced heat output:
•
disconnect the modulator power cable and adjust the screw (
b
) until the pressure values
corresponding to the reduced power indicated in the burner injector-pressure chart are
obtained;
•
reconnect the wire;
• mount the modulator cover and seal.
Burner injector-pressure table
1.24 - 24
Gas type
G20
G31
Injector diameter (mm)
1,18
0,77
Burner pressure (mbar*)
REDUCED HEAT OUTPUT
2,5
5,4
Burner pressure (mbar*)
RATED HEAT OUTPUT
13,1
29,3
N° injectors
13
* 1 mbar = 10,197 mm H
2
O
D) Final checks
•
Note down the conversion on the boiler data label, specifying the type of gas and indicating that calibration was performed.
(b)
(a)
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