Ignition; Changing The Calibration - La San Marco 85-S Serie Modo De Empleo Y Mantenimiento

If the room has a smaller volume, it will be necessary to install the appliance directly under a suction hood,
and also to provide a combustion air intake with a free-flow cross section of al least 100 cm

7.3 Ignition

Press and turn the gas valve knob (51) counterclockwise to the position of the flame symbol, as shown in Fig.
B. While holding the knob pressed, push a few times the burner ignition button, marked with the star symbol
(53) to ignite the burner (piezoelectric ignition).
When the flame is lit, check through the relative hole (54), while keeping the gas knob pressed for 5-10 secon-
ds. After this period, if the flame does not remain lit, repeat the ignition operation again.

7.4 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 relative model. For example, the model code shown on the tag for the gas part characteristic 85-E-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.
1° GRUPPO
0
2 1
1
53 51
Table 1 - Adjusting the primary air (fig. C)
gas 2 Units
GPl l = 8 mm
(G30/G31)
Nat. gas l = 4 mm
(G20)
Qn = Rated heat flow
Qnr = Reduced rated heat flow
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.
34
2° GRUPPO
54
3 Units 4 Units
l = 10 mm l = 12 mm
l = 4 mm l = 4 mm
Table 2 - nozzle diameters in 100/mm
gas 2 Units
GPl 40
(G30/G31)
Nat. gas 60x
(G20)
Qn (kW) 0,75
Qnr (kW) N.A.
2
.
3 Units 4 Units
55 65
81x 90x
1,45 1,9
1,0 1,3