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English
7.5 Changing the calibration
The appliance is prearranged to operate with the gas indicated in the relative settings tag attached to the
appliance.
The information regarding the air setting, injector, rated and reduced heat flow are shown in Tables 1 and 2.
The data that correspond with each model are indicated by the next-to-last character of the code for the re-
lative model. For example, the model code shown on the tag for the gas part characteristic LEVA-3-G shows
number 3 in the next-to-last digit.
In this case, refer to the data shown in Tables 1 and 2, respectively, in the column headed “3 Units”. If you
wish to change the calibration of the appliance, proceed as follows: Unscrew the primary air adjusting ring
nut (55 - Fig. C) to expose the nozzle (56). Using the relative wrench, unscrew the nozzle (56) and replace it
with the proper one indicated in Table 2, checking that the diameter marked on the same nozzle corresponds
to the right diameter.
Screw on the new nozzle (56), and position the primary air adjusting ring nut (55 - Fig. C) according to the
indications of Table 1, using a gauge or equivalent instrument to set the distance “L”, and tighten the screw
provided to fasten the nozzle.
Turn the main switch (1) to position 1, so as to connect a single heating element (50% of the boiler’s electric
power for single-phase heating element with 2 elements and 1/3 of power for heating elements with 3 ele-
ments with three-phase connection), and ignite the burner as in the procedure described above. When the
water contained in the boiler reaches the preset temperature, the gas flow regulator will automatically decre-
ase the flow to the value corresponding to the reduced rated heat flow.
At this point, turn the flow regulation screw (58) so as to have a steady flame licking the sensitive thermocou-
ple element (52), and turn the screw (57) to obtain the maximum desired pressure value in the boiler.
L
50
51
55
57
58
53
52
56
55
SPENTO
ACCESO
Fig.A
Fig.B
Fig.C
DALLA RETE
GA
S
59
1
ϒ
GRUPPO
2
53
1
51 54
1
1
2
ϒ
GRUPPO
Table 1 – Adjusting the primari air (Fig. C)
gas
2 Units
3 Units
4 Units
GPL
L = 8 mm L = 10 mm L = 12 mm
(G30/G31)
Nat. gas L = 4 mm L = 4 mm L = 4 mm
(G20)
Qn = Rated heat flow
Qnr = Reduced rated heat flow
Table 2 – nozze diameters in 100/mm
gas
2 Units
3 Units
4 Units
GPL 40 55 65
(G30/G31)
Nat. gas
60X
81X
90X
(G20)
Qn (kW)
0,75
1,45
1,9
Qnr (kW)
N.A. 1,0
1,3
After having verified the proper operation, replace the settings tag on the appliance with the one for the new
type of gas that is provided with the standard kit containing the newly installed gas nozzle.
Safety devices on appliance (manually reset).
1.
Thermocouple (52):
The thermocouple operates on the valve (51), whose probe (52) must be licked by
the flame from the burner (50). If the probe is not enveloped by the flame, the gas flow will be automati-
cally shut off.
2.
Thermostat (59):
The thermostat, placed in contact with the boiler, operates on the valve (51); when
the thermostat sensor on the boiler reads 140°C, the gas flow will be automatically shut off. The burner
can be re-ignited with the procedure described above only after the boiler body has cooled to 110°C.
