–operate the main switch a number
of times, making sure that the maxi-
mum pressure corresponds to the
values given in
Table 1.
4.2.2 Reduced pressure
adjustment
To set the reduced pressure, proceed
as follows (fig. 9):
– deactivate the coil (2) electric supply;
–switch on the boiler and af ter a
short period of operation at nominal
output, turn the thermostat knob
slowly towards the minimum posi-
tion until you hear the click of the
first contact of the thermostat;
–leave the knob in that position and,
turning the screw (4), seek the mini-
mum pressure value according to
Table 1 for the gas in question: to
r educe t he pr essur e, tur n t he
scr ew (4) count er clockwise; t o
increase the pressure, turn the
screw (4) clockwise;
–restore electric power to the coil;
–operate the main switch a number
of times, making sure that the mini-
mum pressure corresponds to the
value given in
Table 1.
4.3
GAS CONVERSION
To convert to butane gas (G30) or pro-
pane gas (G31), the main nozzles must
be replaced with another supplied in the
boiler gas conversion kit and apply the
LPG adaptor code 6248301 onto the
gas valve (5 fig. 8). To adjust the opera-
ting pressures, refer to section 4.2.
When the working pressures have
been adjusted, reseal the regulators.
After have ultimated the conversion of
the boiler, please stick onto the casing
panel the plate showing the relevant
feeding gas which is included into the
conversion kit.
NOTE: After assembling all the gas
connections, a test for gas tightness
must be carried out using soapy water
or special products. Do not use naked
flames. The conversion to different
gas must be carried out exclusively by
authorized technical personnel.
4.4
SHELL DISASSEMBLY
Follow the steps described below to
disassemble the shell (fig. 10):
–Remove the shell door (1) which is
attached with pressure fit pins.
–To remove the cover (3) loosen the
two screws that attach it to the flue
gas chamber and lift.
–Remove the top front panel (2) pla-
cing it against the flue gas chamber.
–Disassemble the left side (4)
unscrewing the nuts that attach it to
the tie rods.
–Do the same operation to disassem-
ble the right side (5).
–Remove the inner wall (6) by pulling it
forward.
–Unscrew the nuts that secure the
rear wall (7) to remove it from the
tie rods.
4.5
CLEANING AND
MAINTENANCE
At the end of each heating season, it is
essential to have the boiler thoroughly
checked and cleaned out.
Proceed as follows:
–Turn the main switch off to stop
electric power reaching the boiler
and close the gas feed cock.
–Remove the shell door and cover.
–Remove the top panel of the flue gas
chamber attached to it with self-
threading screws.
–Remove the gas unit.
–Insert a special brush from the top
into the rows of pins in the cast iron
exchanger and move the brush up
and down to remove the scales.
–Remove the burner from the nozzle
header and aim a jet of air toward
the inside of the burners to remove
any dust. Make sure that there are
no scales on the top drilled part of
the burners (fig. 11).
44
LEYENDA
1
Locknut M13
2
Coil
3
Max. pressure
adjust. connection
4
Min. pressure
adjust. screw
Fig. 9
Fig. 10
KEY
1
Boiler body
2
Burner
3
Main nozzle
4
Aluminium washer
5
Burner manifold
Fig. 11
