Characteristics; Electronic Board - Sime Planet Dewy 25 BF Manual Del Usuario

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 compo-
nents are guaranteed against a temperatu-
re 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. 19.
3. 1 .2 Devices
The electronic board is equipped with the
following devices:
– "POT. RISC." trimmer (10 fig. 20)
Sets the maximum heating power value.
To increase the value turn the trimmer
clockwise; to reduce the value turn the
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
108
trimmer anticlockwise.
– "POT. ACC." trimmer (6 fig. 20)
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 propane
gas (G31). To increase pressure, turn
the trimmer clockwise; to reduce pres-
sure, turn the trimmer counterclockwi-
se. The slow ignition pressure level can
be set during the first 3 seconds fol-
lowing burner ignition.
After setting the pressure level upon
ignition (STEP) according to the type of
gas, check that the pressure for hea-
ting is still at the value previously set.
– "MET-GPL" connector (7 fig. 20)
When the connector is not connected
up the boiler is ready to operate on
NATURAL GAS.
– "ANN. RIT." connector (5 fig. 20)
In the heating phase, the electronic board
is programmed to include a burner tech-
nical delay interval of approx. 90 seconds,
which occurs both at system cold star-
ting and at subsequent re-ignitions. The
aim is to overcome the problem of repea-
ted ignitions and turning 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
Flashing red led, fan.
)
)
(*) When all 0.5 to 2.5 bar leds are off, check the water pres-
sure transducer connection.
Flashing red led,
communication fault
with "Logica Remote Control"
Flashing red led, flame detection circuit fault
Flashing red led, heating sensor fault (SM)
A flashing red Led indicates an anomaly on the D.H.W. sensor.
This function is active in model "BFT" only when connected with
a model "BT100" tank unit.
set itself for about 1 minute at the mini-
mum modulation pressure, and will then
move to the heating 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 can-
celled. In this case, the times elapsing
between turning off and subsequent re-
ignition will depend on a temperature dif-
ference of 5°C detected by the SM sen-
sor (heating flow sensor).
– DIP SWITCH (13 fig. 20)
Model "BFT" only: check that the cord-
less plugs are inserted in the position
indicated:
– "Modureg Sel." connector (14 fig. 20)
Model "BFT" onl y: wit h t he bridge
disconnected the boiler is predisposed
to function with the SIT gas valve, and
with the bridge connected it is predispo-
sed to function with the HONEYWELL
gas valve.
– "Albatros" connector (15 fig. 20)
The bridge must always be disconnected.
It is connected only when multiple boilers
are installed in a sequence/cascade.
ATTENTION: It is essential that the opera-
tions described above be carried out by
authorized technical staff.
Flashing red led, water
pressure is too low (*)
Flashing red led,
plant safety
valve tripped (*)
Fig. 19