38
Adapting the hob to different types of gas
To adapt the Hob for use with different types of gas, carry out the following instructions:
— remove the grids and burners
— insert the hexagonal spanner (supplied) into the burner support (Fig. 5)
— unscrew the injector and replace it with one suitable for the gas to be used (see
Table of gas consumption)
— carry out regulation of the burner.
Hexagonal spanner
Fig. 5
Regulating the burners
For maximum efficiency from the burners, the correct combustion of the flame is neces-
sary (see table of gas consumptions quota “X”). A good flame must be well aligned and
without yellow tips (Fig. 7/B). If there is insufficient air, the flame will be uneven with yel-
low tips (Fig. 7/A). If there is too much air, the flame will be very short and bright (Fig.
7/C). In these cases the combustion
must be adjusted by re-fitting the carburation tube to the Venturi (where there is insuffi-
cient air) or removing the carburation tube (in the case of too much air). To position the
carburation tube, the fixing screws must be loosened, and retightened when the satisfac-
tory combustion is obtained.
air
regul.
4mm
4mm
2mm
6mm
15 mm
13 mm
Working
burner
large back right
large front left
medium
small
double ring
maxi
Ø injector
1/100 mm
120
127
93
80
2x94
2x94
Ø injector
1/100 mm
80
84
61
54
2x65
2x65
Qn
kW
2,65
2,95
1,5
1,1
3,3
3,3
l/h
G20
252
281
143
105
314
314
g/h
G30
193
215
109
80
238
238
g/h
G31
189
211
107
79
236
236
Qn
kW
2,5
2,8
1,45
1,05
3,1
3,1
l/h
G25
277
310
161
116
314
314
Qmin.
kW
0,650
0,650
0,380
0,280
0,900
0,900
air
regul.
4mm
4mm
2mm
6mm
13 mm
13 mm
air
regul.
2mm
2mm
5mm
4mm
0 mm
0 mm
G20 G30 G25 G31
G30G20/G25 G20/G30 G25
Quota «X» depending
on type of gas
Table of gas consumption 1W = 0,860 kcal/h
air
regul.
5mm
5mm
7mm
6mm
15 mm
13 mm
Regulating the minimum flame
After lighting the burners, turn the control knob to the minimum setting and then remo-
ve the knob (this can easily be removed by apply a gentle pressure).
Using a small «Terminal» type screwdriver the regulating screw can be adjusted as in
Fig. 8. Turning the screw clockwise reduces the gas flow, whilst turning it anticlockwise
increases the flow – Use this adjustment to obtain a flame of approximately 3 to 4 mm
in length and then replace the control knob.
If GPL (cylinder) gas is being used, turn the screw clockwise right to the end of the
travel of the by-pass.
Screws regulating
(for differend models)
39
Fig. 6 Fig. 7
BURNER CAP
BURNER
AIR REGULATION
SCREW
FIXING
SCREW
SMALL
MEDIUM
LARGE
DOUBLE RING
MAXI
For dimensions «X» see table of gas consumption
When you have carried out the new gas regulation, replace the old gas rating pla-
te on your appliance with one (supplied with hob) suitable for the type of gas for
which it has been regulated.
Lubricating the gas taps
If a gas tap becomes stiff, it should be dismantled, cleaned carefully with petrol and
smeared with a drop of special heat resistant grease.
The following operations should be carried but:
— disconnect the electrical power supply, close the gas supply tap from the mains or
cylinder.
— Remove the knobs and the plate by removing the screws located at the rear of the
plate itself and beneath the individual burners.
— Remove the two screws holding down the head flange.
— Remove the head flange and the retaining spring on the knob shaft.
— Remove the gas regulation cone, clean it with petrol and smear it with some heat
resistant grease, taking care not to obstruct any holes through which gas must pass.
— Re-assemble all the parts, making sure that the spring and the rotating axis of the
cone fitted to the knob shaft are correctly seated.
Fig. 8
