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6 - START UP
6.5 - Start up
 open the gas cock;
power to the boiler;
if the display shows E 21, it means
that the phase/neutral polarity has not
been observed; Exchange them;
at start up, the display shows a F for
2 minutes during which the system
is bleeded. If you want to bypass
this phase, just press the + and buttons together until the F begins to
flash. Then press the RESET button;
rotate knobs "8" and "9" shown in figure
1 to the desired temperature;
the heating service starts only when
the room thermostat calls for heating.
If the external temperature sensor is
connected, check that the calculated
temperature is greater than the
minimum heating temperature (see
figure 32);
if the pump operation indicator (see
section 7.16) is on and the pump (see
figure 1 detail “44” is not running, it is
necessary to unlock it;
if the pump warning light (see section
7.16) is on and the radiators do not
heat up, repeat air bleeding operations
on both the boiler and the radiators.
6.5.1 - Self drainage
6.6 - Checking
the gas supply
pressure and
adjusting it if
necessary
The gas supply pressure must match
that given in the table in chapter 9 at
the end of this manual. To check it,
proceed as follows:
 close the gas cock;
 access the boiler internal
components by following the
procedure in section 8.3;
 loosen the pressure connection “D”
(see figure 26);
 connect a pressure gauge with a
definition of at least 0.1 mbar (1
mmH2O);
 open the gas cock;
 check that the pressure does not
exceed the value given in the table
in chapter 6 under the heading
“Maximum gas supply pressure”;
 turn on the boiler and generate a
request for heating (rotate knob “9”
shown in figure 1 to the maximum)
and make sure the room thermostat
is in heating call status;
Every time the appliance is powered,  press buttons
and
a 2 minute self drainage procedure is
together for more than 10 seconds
started to bleed air from the system. The
is displayed;
until
procedure starts and stops the pump to
better remove air.
 press button
until you display
. Now the boiler is forced to
maximum power for 10 minutes;
 Repeat the procedure for the “SLAVE”
thermal element;
 check that the pressure does not
drop below the “Minimum gas
supply pressure" indicated in the
table in chapter 9 at the end of the
manual.
If the supply pressure does not fall
within the above values, operate
upstream of the appliance to bring the
pressure back within the maximum and
minimum range.
Once checked, close the pressure
connection "D" (see figure 26) and
verify whether there is any gas
leakage.
C- Service pressure connection
D- Supply gas pressure
inlet
E - CO2 adjusting screws
Maximum power
F - CO2 adjusting screws
to maximum power
Figure 26 - Gas valve
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