59
IT
ES
GB
3.1
ELECTRONIC
BOARD
The electronic boards are manufactured in
compliance with the EEC 73/23 low-voltage
directives.
They are supplied with 230V and, through a
built-in transformer, send a voltage of 24V
to the following components:
modulator,
D.H.W./C.H. sensors, room stat, water
flowmeter/water pressure switch, pressu-
re switch valve, flue gas thermostat/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.
–
Jumper JP2
(1)
If the electronic card is replaced, cut the
jumper on the card supplied as a spare
part only when using boiler version
“OF”
.
ATTENTION:
It is essential that the operations descri-
bed above be carried out by authorized
technical staff.
3.2
TEMPERATURE SENSOR
3.2.1
Model “GG F 23 - 28 BF”
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 measu-
red is higher than 85°C; the reset tempe-
rature is set at 80°C.
When sensor has tripped, the boiler will
not function for either service.
3
CHARACTERISTICS
Fig. 15
1
2
10
4
5
3
7
8
9
KEY
1 Jumper JP2
2 Fuse (1,6 AT)
3 D.H.W. potentiometer
4 Connector “METHANE/GPL”
5 Rotay switch
7 Block red led
8 C.H. potentiometer
9 Bi-colour led gree/orange
10 Connector “TA”
Fig. 14
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/smokes stat failure.
Orange led flashes if water pressure is insufficient (vers.
“OF”
)/
no water circulation (vers.
“BF”
)
Flashing red led indicates a problem in the tap water probe (SS).
Red led on, ignition blocked/safety stat tripped:
turn the rotary switch in the position ( )
to restore functioning
