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57
INSTRUCTIONS FOR FITTERS
71.05086.02 - EN
The Technical Assistance Service can convert this boiler to natural gas (
G20
) or liquid gas (
G30, G31
).
19. GAS CONVERSION METHODS
Carry out the following operations:
A) replace the main burner nozzles;
B) change the modulator voltage
C) new max. and min. calibration of the pressure regulator.
A) Replace the burner injectors
• carefully pull the burner off its seat;
• replace the burner injectors making sure they are fully
tightened to prevent gas leaks. The injector diameters are
specified in table 2.
B) Change the modulator voltage
•
set parameter
F02
according to the gas used, as descri-
bed in section 21.
C) Calibrate the pressure regulator
• connect the positive pressure test point of a differential
(possibly water-operated) manometer to the gas valve
pressure test point (
Pb
) (Figure 13). Connect the negati-
ve pressure test point of the manometer to a “
T
” fitting
in order to join the boiler adjusting outlet, the gas valve
adjusting outlet (
Pc
) and the manometer. (The same mea-
surement can be carried out by connecting the manometer
to the pressure test point (
Pb
) after removing the sealed
chamber front panel);
If you measure the pressure of burners in a different way you may obtain an altered result in that the low pressure created
in the sealed chamber by the fan would not be taken into account.
C1) Adjustment to nominal heat output:
• open the gas cock;
•
press the button
• and set the boiler in winter mode (section 3.2);
• turn on a hot water tap to reach a minimum 10 l/min flow rate or ensure that maximum heating requirements are set;
• check that boiler feeding dynamic pressure, as measured at the inlet gas valve pressure test point (Pa) (Figure 13) is
correct (
30 mbar
for
butane
gas,
37 mbar
for
propane
gas or
20 mbar
for
natural
gas);
• remove the modulator cover;
• adjust the tube brass screw to obtain the pressure settings shown in table 1;
C2) Adjustment to reduced heat output:
• disconnect the modulator feeding cable and unscrew the screw to reach the pressure setting corresponding to reduced
heat output (see table 1);
• connect the cable again;
• fit the modulator cover and seal.
C3) Final checks
• attach the additional plate supplied with the transformer, specifying the type of gas and the calibration performed.
SIT valve mod. SIGMA 845
Figure 13
9912221500
Pc
Pb
Pa
Table of burner injectors
280 Fi
Type of gas
G20
G30
G31
diameter of nozzles (mm)
1,18
0,69
0,69
Burner pressure (mbar*)
REDUCED POWER
1,7
4,3
5,9
Burner pressure (mbar*)
RATED POWER
10,6
28,1
35,6
N° 1 diaphragm diameter (mm)
-
-
-
N° nozzles
18
* 1 mbar = 10,197 mm H
2
O
Table 1
280 Fi
Consumption 15 °C
1013 mbar
G20
G30
G31
Rated power
3,18 m
3
/h
2,37 kg/h
2,34 kg/h
Reduced power
1,26 m
3
/h
0,94 kg/h
0,92 kg/h
p.c.i.
34,02 MJ/m
3
45,60 MJ/kg
46,30 MJ/kg
Table 2
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