Characteristics; Electronic Board - Sime Planet 25 OF Manual De Instrucciones

3

CHARACTERISTICS

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: gas valve,
safety stat, C.H. and D.H.W. sensor, external
temperature sensor (optional), modulator,
micro divertor valve, flow switch safety
valve, water pressure transducer, exhaust
gas thermostat/pressure switch, room
stat or "Logica Remote Control".
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 guaranteed
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. 24.
Flashing red led, fan fault towards "BF".
30 minutes after the fan has switched off,
the board will attempt a restart
Red led on, ignition blocked:
rotate selector
CR/OFF/EST/INV/RESET
to release position (
to restore operation
Green led off if
power is cut-off
Flashing red led,
safety stat tripped. Rotate
selector CR/OFF/EST/INV/RESET
to release position (
to restore operation
Flashing red led, exhaust gas safety
device tripped towards "OF".
After 10 minute, the board will
attempt an automatic restart
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3. 1 .2 Devices
The electronic board is equipped with the
following devices:
– "POT. RISC." trimmer (10 fig. 25)
Sets the maximum heating power value.
To increase the value turn the trimmer
clockwise; to reduce the value turn the
trimmer anticlockwise.
– "POT. ACC." trimmer (6 fig. 25)
Trimmer to vary the pressure level upon
ignition (STEP), of the gas valve.
According to the type of gas for which
the boiler is equipped, the trimmer must
be regulated so as to obtain a pressure
of approx. 3 mbar at the burner for
methane gas and 7 mbar for butane gas
(G30) and propane gas (G31).
To increase pressure, turn the trimmer
clockwise; to reduce pressure, turn the
trimmer counterclockwise.
The slow ignition pressure level can be
set during the first 3 seconds following
burner ignition.
After setting the pressure level upon
ignition (STEP) according to the type of
)
)
(*) When all 0.5 to 2.5 bar leds are off, check the water pressure
transducer connection.
Flashing red led,
communication fault
with "Logica Remote
Control"
Flashing red led, flame detection circuit fault
Flashing red led, modulator coil interrupted
Flashing red led, heating sensor fault (SM)
A flashing red Led indicates an anomaly on the D.H.W. sensor
(except in model "25 BFR"). This function is active in model
"25 BFT" only when connected with a "BT100" tank unit.
Flashing red led, exhaust gas pressure
switch failure towards "BF"
gas, check that the pressure for hea-
ting is still at the value previously set.
– "MET-GPL" connector (7 fig. 25)
With the connector switched-off, the boiler
is set-up for natural gas; with the connector
switched-on, the boiler is ready for LPG.
– "ANN. RIT." connector (5 fig. 25):
In the heating phase, the electronic
board is programmed to include a bur-
ner technical delay interval of approx.
90 seconds, which occurs both at
system cold starting and at subsequent
re-ignitions. The aim is to overcome the
problem of repeated ignitions and tur-
ning off with very short time intervals
between. This could occur in particular in
systems presenting high head losses.
At each restart after the period of slow
ignition, the boiler will set itself for about
1 minute at the minimum modulation
pressure, and will then move to the hea-
ting pressure value set.
When the connecting link is inserted,
both the programmed technical pause
and the period of operation at minimum
pressure in the startup phase will be
Flashing red led, water
pressure is too low (*)
Flashing red led,
plant safety
valve tripped (*)
Fig. 24