Electrical Control And Command Equipment; Safety Function; Operating Function; Controlled Stoppage - Sime FUEL 25 EV Manual De Uso, Instalación Y Mantenimiento

2.6

Electrical control and command equipment

The EBR-M14 command and control electrical equipment con-
trols and monitors the burner's operation. The microprocessor
controls the programme's sequence and guarantees maximum
stability of the cycle times, regardless of any fluctuations in
the supply lines or of the room temperature. The control unit
is made with materials that guarantee protection against the
potential consequences caused by open flames. Whenever the
supply voltage drops below its minimum rated level (70 ± 8 V),
the control unit locks out, even if no error signal appears. It swi-
tches back on after the supply voltage rises again above (190 ±
8 V).
2.6.3

Safety function

A safety shutdown occurs if:
– during the pre-ventilation phase there is a flame signal (flame monitoring);
– the flame has failed to ignite within the safety interval (5s from the opening of the fuel solenoid valve).
A safety shutdown is signalled by the lock-out indicator light (lit steady red).
The operating conditions can only be restored (reset) once the cause of the lock-out has been eliminated and the reset button (9) has
been pressed, as illustrated in "Fig. 2".
General
power
LINE
supply
C
Boiler
temperature
control
Pre heater
Motor
Ignition
Transformer
Fuel solenoid
valve
Flame check
Flame
-
42
tpi
to tr th tp ts
7s
<400s 10s 15s 5s
2.6.1

Operating function

– If there is a heat request (green LED lit), the command and
control unit will start the programme's sequence.
– The heater heats the diesel in the oil line.
– When the optimal temperature is reached, the motor starts,
the ignition transformer activates and the 15-second pre-ven-
tilation phase starts.
– During the pre-ventilation phase, the burner is monitored
through the flame signal.
– Once the pre-ventilation phase terminates, the diesel sole-
noid valve opens, the flame ignites and the burner starts.
– The ignition transformer remains engaged for the entire du-
ration of the post-ignition phase.
2.6.2

Controlled stoppage

Controlled stoppage occurs if:
– the boiler thermostat interrupts the heat request;
– the oil solenoid valve closes and the flame goes out;
– the 15-second (factory-set time) post-ventilation cycle starts,
after which the motor stops;
– the burner enters the stand-by mode pending a new heat re-
quest.
to
tr
th
tp
ts
tpi
tpp
tpp
-
15s
Stand-by: the burner waits for the
heat request
Heating time
Stabilisation time
Pre-ventilation time
Safety time
Post-ignition time
Post-ventilation time
EN
Fig. 6