24
3. wait at least 10 seconds
and verify that the measured pressure corresponds to the MAX value
indicated in the Burner Pressure table (see page 26), with regard to the boiler model and gas type;
4.
extract one of the connectors
4
that supply the
modulation coil; verify that the measured pres-
sure corresponds to the MIN value indicated in the
Burner Pressure table (see page 26), with regard to
the boiler model and gas type;
5.
reinsert the connector
4
;
6.
if it is necessary to adjust the regulation, proceed
as it follows, referring to the figure:
• take off the protection cap
C
;
• adjust MAX pressure acting on the nut
B
(10 mm).
Turn clockwise to increase pressure, counterclock-
wise to decrease pressure;
• extract again one of the connectors
4
;
• adjust MIN pressure acting on the screw
A
(with
a 4 mm screwdriver), paying attention not to con-
temporarily move the nut
B
. Turn clockwise to
increase pressure, counterclockwise to decrease
pressure;
• reinsert the connector
4
and check that MAX pressure is not changed;
Important: LOCK THE ADjUSTMENT DEvICE AFTER ANY SETTING OPERATION.
• mount the cap
C
;
7.
screw the pressure tapping point screw for gas outlet
1
and
verify that there is no gas leak
.
8.
To switch the burner off, turn the Summer/Winter knob
to the
position.
Max heating power adjustment
The maximum heating power output must be set in accordance with the system requirements (stated
in the project). Once you know the power suitable for the heating system, refer to the "Burner pressure
tables" on page 26 and find the burner pressure for the boiler model and for the type of gas used.
The adjustment will be performed through the boiler’s controls, following a special procedure that
avoids accidental activations by the User:
1.
Loosen (2-3 turns) the screw of pressure tapping point for gas outlet
1
of the gas valve and insert
the manometer sensor. Do not use the tapping point “Vent”
3
that
must always be closed
;
2.
supply the boiler and turn the Summer/Winter knob to Summer position ;
3.
ensure that there are NOT domestic hot water requests (no open taps); if the room thermostat is
installed, make so that it requires the heating (e.g. raise the requested room temperature manu-
ally);
• turn the Hot Water knob
on
service
position: on the display will appear a flashing number
from 00 to 99 that indicates the current set point of the value of heating power, where the value
00
corresponds to the minimum setting of the gas valve
and the value
99
corresponds to the
maximum;
• wait (approximately five seconds) that the display shows
“PO”
(POwer) flashing (moreover, both
the
GREEN
and
RED
indicators flash to short “pulses”).
Pressure tapping points:
1
outlet
2
inlet
3
equalization (VENT)
(not used in natural
draught models)
