3.1
ELECTRONIC BOARD
Made in accordance with the Low Voltage
EEC directive 73/23, supplied with 230
Volt; via a transformer it sends 24 Volt to
the following components: modulator, C.H.
and D.H.W. sensors, gas valve, limit stat,
room stat, water pressure switch and time
programmer.
An automatic and continuous modulating
system allows the boiler to adjust the power
to the various systems or user demands.
The electronic components are guaranteed
to work in a temperature range between 0
and +60 °C.
3.1.1
Functioning faults
The leds that show an irregular and/or
incorrect functioning of the boiler are
shown in fig. 21.
3.1.2
Devices
The electronic board has the following devi-
ces (fig. 22):
–
Trimmer “POT. RISC.”
(1)
It regulates the maximum value of hea-
ting power. To increase the value turn
the trimmer in a clockwise direction and
to decrease it turn the trimmer in an
anti-clockwise direction.
–
Trimmer “POT. ACC.”
(6)
Tr immer t o var y t he pr essur e level
(STEP) in the ignition of the gas valve. In
accordance with the type of gas for
which the boiler is predisposed, the trim-
mer must be regulated so as to provide
the burner with a pressure of around 3
mbar for methane gas or 7 mbar for
butane (G30) and propane gas (G31).
To increase the pressure turn the trim-
mer in a clockwise direction, to decrease
it turn the trimmer in an anti-clockwise
direction.
The level of pressure of slow starting is
able to be set during the first 3 seconds
from the starting of the burner.
Af ter having established the level of
pressure at starting (STEP) according to
the type of gas, check that the heating
gas pressure is still on the value previou-
sly set.
–
Connector “METANO-GPL”
(4)
With the connector disconnected, the
boiler is ready to function with METHANE;
with the connector connected with GPL.
–
Connector “ANN. RIT.”
(5)
The electronic board is programmed, in
heating phase, with a technical pause by
84
3
CHARACTERISTICS
Fig. 22
KEY
1 “Heating Power” trimmer
2 Fuse (F 1,6A)
3 Hot-water service potentiometer
4 Connector “METHANE/GPL”
5 Connector “Delay cancellation”
6 “Start up Power” trimmer
7 Block red led
8 Heating potentiometer
9 Bi-colour led green/orange
10 Connector “TA”
NOTE: To have access to the regulating
trimmers (1) and (6) take off the hea-
ting potentiometer knob.
Fig. 21
Bicolour green led off in case of no electricity
Bicolour orange led flashing in case of insufficient water pressure
Bicolour orange led flashing - C.H. sensor (SM) fault.
Bicolour green led flashing - in case of interception by the smoke safety device in
the version
“25/60 OF”
: reinstate the thermostat button to restore functioning.
Green led flashing - fan/pressure switch failure in the vers.
“BF”
.
Red led - ignition blocked / safety stat interception:
turn the rotary switch in the position
( ) to restore functioning
0
30
60
90
120
bar
°
C
0
3
4
1
B
A
C
6
1
2
3
5
9
7
6
1
8
4
10
