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3
CHARACTERISTICS
3. 1
ELECTRONIC BOARD
IT
The electronic boards are manufactured in
ES
compliance with the EEC 73/23 low-voltage
directives.
They are supplied with 230V and, through a
PT
built-in transformer, send a voltage of 24V
to the following components: modulator,
GB
C.H. sensors, solar temperature sensor,
room stat, water flowmeter, pressure swit-
ch valve, flue gas pressure switch, safey
thermostat and time programmer.
An automatic and continuous modulation
system enables the boiler to adjust the heat
output to the various system requirements
or the User's needs.
The electronic components are guaran-
teed against a temperature range of 0°
to +60°C.
3. 1 . 1
Fault finding
The indicator leds signalling 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 "METANO-GPL" (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.
2
5
84
3.2
TEMPERATURE SENSOR
Antifreeze system made up of the NTC hea-
ting sensor that activates when the water
temperature reaches 6°C. The sensor acts
as a limit stat, switching-off the burner
when the temperature measured is higher
than 85°C; the reset temperature is set at
80°C.
If the heating probe (SM) is off, the boi-
ler does not work for either heating or
hot water. When the solar temperature
probe (ST) is cut off and the power is
disconnected, the fault signal disappears,
the boiler functions in "non solar" mode
3
4
1
10
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.
Orange led flashes no water circulation.
Flashing green/orange led indicates a problem
in the solar temperature probe (ST).
Red led on, ignition blocked/safety stat tripped:
turn the rotary switch in the position ( )
to restore functioning
and the probe fault remains unsolved.
Table 3 shows the resistance values (Ω)
that are obtained on the sensor heating and
solar temperature as the temperature
varies.
TABLE 3
Temperature (°C)
KEY
1 Jumper JP2
7
2 Fuse (1,6 AT)
3 D.H.W. potentiometer
8
4 Connector "METHANE/GPL"
5 Rotay switch
7 Block red led
9
8 C.H. potentiometer
9 Bi-colour led gree/orange
10 Connector "TA"
Fig. 14
Resistance (Ω)
20
12.090
30
8.313
40
5.828
50
4. 1 61
60
3.021
70
2.229
80
1.669
Fig. 15
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