15
3.1
ELECTRONIC BOARD
The electronic board is manufactured in
compliance with the EEC 73/23 low-volta-
ge directives. It is supplied with 230V. The
electronic components are guaranteed
against a temperature range of 0 up to
+60° C. An aut omatic and continuous
modulation system enables the boiler to
adjust power to the various system requi-
rements or the user’s needs.
3.1.1
Fault and malfunction signaling
The indicator LEDS signaling irregular
and/or incorrect operation of the equip-
ment are indicated in fig. 14.
3.1.2
Devices
The electronic board is equipped with the
following devices (fig. 15):
–
Connector “JP4”
(4)
With the connector disconnected, the
boiler is ready to function with METHANE;
with the connector connected with GPL.
ATTENTION: It is essential that the opera-
tions described above be carried out by
authorized technical staff.
3.2
TEMPERATURE SENSOR
Antifreeze system managed by active hea-
ting NTC sensor when water temperature
is 6°C. The heating sensor works also as a
limit thermostat which switches off the bur-
ner when temperature is over 90°C.
When sensor (SM) is interrupted, neither
of the boiler's heating services will func-
tion.
Table 5
shows the resistance values (
Ω
)
obtained on the heating sensor as the tem-
perature varies.
3
CHARACTERISTICS
Fig. 14
1
2
10
4
5
3
7
8
9
Fig. 15
TABLE 5
Temperature (°C)
Resistance (
Ω
)
20
12.090
30
8.313
40
5.828
50
4.161
60
3.021
70
2.229
80
1.669
KEY
1 Jumper JP2
2 Fuse (1,6 AT)
3 D.H.W. potentiometer
4 Connector “JP4”
5 Rotay switch
7 Block red led
8 C.H. potentiometer
9 Bi-colour led gree/orange
10 Connector “TA”
Bi-colour green led off if power is cut-off.
Bi-colour orange led: C.H. sensor (SM) fault.
Green led flashing: fan/smoke pressure switch.
Flashing orange led no water circulation.
Flashing red led indicates a problem in the line post-condenser.
Red led on, ignition blocked/safety stat /smoke stat tripped:
turn the rotary switch in the position ( )
to restore functioning
