101
3.1
ELECTRONIC BOARD
Made in accordance with the Low Voltage
EEC directive 73/23, supplied with 230 V;
via a transformer it sends 24 V to the fol-
lowing components: gas valve, safety stat,
C.H. and D.H.W. sensors, external tempera-
ture sensor (optional), modulator, micro
diver tor valve, flow switch safety valve,
water pressure transducer, smoke pressu-
re switch, smoke stat, room stat or “Logica
Remote Control”.
An automatic and continuous modulating
system allows the boiler to adjust the
p o w e r t o t h e v a r i o u s p l a n t o r u s e r
demands. The electronic components are
guarant eed t o work in a t emperatur e
range between 0 and +60 °C.
3.1.1
Faults findings
The leds that show an irregular and/or
incorrect functioning of the boiler are
shown in fig. 9.
3.1.2
Devices
The electronic board has the following
devices:
–
Trimmer “POT. RISC.”
(10 fig. 10)
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 fig. 10)
Trimmer for the changing of the ignition
pressure level (STEP) of the gas valve.
According to the type of gas for which the
boiler is predisposed, the trimmer must
be regulated so as to provide the burner
with a pressure of around 8 mbar for
methane gas or 18 mbar for propane
gas (G31). To increase the pressure turn
the trimmer 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 5 seconds from the starting of
the burner.
After 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 set beforehand.
–
Connector “MET-GPL”
(7 fig. 10)
With the connector disconnected, the
boiler is ready to function with MET; with
the connector connected with GPL.
–
Connector “ANN. RIT.”
(5 fig. 10)
The electronic board is programmed, in
heating phase, with a technical pause by
the burner of around 90 seconds, both
at the beginning when the plant is cold
and in the subsequent startings.
This is so to avoid ignitions and switching
off with very short intervals, that may in
particular be found in plants with high
losses. At every restarting, following the
period of slow starting, the boiler will posi-
tion itself for around 1 minute to the mini-
mum modulating pressure to then return
to the set value of heating pressure.
With the insertion of the bridge both
the technical pause programmed and
the period of functioning at minimum
pressure in the starting phase will be
eliminated. In such a case, the time
that runs between the switching of f
and the next starting will be in function
of a variance of 5 °C, as shown by the
heating feeler (SM).
–
DIP SWITCH
(13 fig. 10)
In the
“32/80 OF”
version and in the
“22
OF -32 OF”
versions connected to the
“BT130- BT150”
D.H.W. tanks, the riders
must have the configuration shown in the
figure in order for the boiler to work:
In the version
“32/50 OF”
, instead, the
riders must have the configuration shown
in the figure for the boiler to function:
–
Connector “Modureg Sel.”
(14 fig. 10)
With the bridge disconnected the boiler
is predisposed to function with the SIT
gas valve, and with the bridge connected
it is predisposed to function with the
HONEYWELL gas valve.
3
CHARACTERISTICS
Green led off
in case of no electricity
Red led flashing in case of
insufficient water pressure
Red led flashing - problem with D.H.W. sensor (SB).
The function is active in the versions
“22 OF - 32 OF”
only when the boiler is connected to a tank unit
“BT130-BT150”
Red led flashing - problem with C.H. sensor (SM)
Red led flashing - coil of the modulator stopped
Red led flashing - problem in flame detector circuit
Red led flashing
in case of plant safety
valve interception
Red led flashing - lack of
communication with the
“Logic Remote Control”
Red led on - starting failure
turn the selector
CR/OFF/SUM/WIN/UNBLOCK
in the position unblock ( )
to restore functioning
Red led flashing - safety stat
interception. To restore functioning
turn the selector
CR/OFF/EST/INVE/UNBLOCK
in the position unblock ( )
Red led flashing - smoke safety device
interception. To restore functioning
reset the thermostat button.
After 10 minutes the panel
will reactivate the boiler.
Fig. 9
