Recycle And Limit Of Repetitions; Presence Of An Extraneous Light Or Parasite Flame; Pre And Post-Ignition Of The Discharge Of The Ignition Transformer; Reset By Button And Remotely Of The Burner - Riello MO550-BWG Instrucciones De Instalación, Uso Y Mantenimiento

3.7.6

Recycle and limit of repetitions

The control box allows a recycle function, i.e. complete repetition
of the start-up sequence, making up to 3 attempts, in the event
the flame failure during operation. If the flame failure 4 times dur-
ing operations, this will cause a burner lockout. If there is a new
heat request during the recycle, the 3 attempts are reset when
the limit thermostat (TL) switches.
NOTE:
After 510 seconds of continuous operation, a new attempt of
possibility is added.
By disconnecting the power supply, when a new heat request oc-
curs (power supply is applied to the burner) all possible attempts
at re-ignition are reset (maximum 3).
3.7.7 Presence of an extraneous light or parasite
flame
The presence of the parasite flame or the extraneous light can be
detected in the standby condition when the burner is stopped and
waiting for a heat request.
If the presence of a flame or extraneous light is detected also in
the "t2" stage, the motor does not start until the flame signal has
disappeared or until lockout has been reached.
If when the fan motor starts, during the pre-purging, an extrane-
ous light or parasite flame is detected the burner remains in purg-
ing until it disappears or the lockout condition is reached 25
seconds.
if the parasite flame or the extraneous light are detected during
the pre-purging, the pre-purging time of 15 seconds is reset and
the time for checking for the presence of a parasite flame or ex-
traneous light begins (the motor continues to purge).
The function is cumulative and can be carried out a maximum of
2 times.
If at the 24th second the parasite flame or the extraneous light
disappears, the pre-purging time starts and if the parasite flame
or the extraneous light reappear the pre-purging time is reset and
the countdown of 25 seconds for checking for the presence of the
parasite flame or the extraneous light restarts.
The third time that the parasite flame or the extraneous light ap-
pears the burner goes into lockout.
If during the recycling due to flame disappearance when operat-
ing and the consequent repetition of the start-up sequence the
presence of a parasitic flame or extraneous light is detected, the
control countdown of 25 seconds starts (for the presence of the
parasitic flame or extraneous light).
The fault is indicated by the blinking LED (see paragraph "Fault
diagnostics - lockouts" on page 10).
3.7.8 Pre and post-ignition of the discharge of the
ignition transformer
In the pre-ignition time, the ignition device starts 5 seconds be-
fore the opening of the oil valve.
In the post-spark ignition time, the ignition device stops 3 sec-
onds after safety time.
The spark ignition is present during all safety time.
In the event of continuous recycling or heat re-
quests that are close together, the maximum al-
lowed number of cycle repetitions for the ignition
transformer is one every minute.
WARNING
Electrical data and operating times
3.7.9
The burner can be released by pressing, for at least 0.4 seconds,
the reset button integrated in the control box and the unlocking
occurs only when the button is released.
The burner can also be reset using an external button (remote re-
set) connected to the R terminals (see RS electric diagram) on
the burner pressing for at least 0.8 seconds.

3.7.10 Protection reset

The burner can be reset only 5 times consecutively, then power
supply has to be disconnected for a new 5 reset possibilities.
The burner can only be reset if power supply is applied to the con-
trol box.

3.7.11 Reset button/Remote reset fault

If the reset button is faulty or is kept pressed for more than 60
seconds, the fault is indicated by the blinking of the LED (see par-
agraph "Fault diagnostics - lockouts" on page 10) as long as
it is present.
This fault is merely a visualisation.
 If the fault is detected during pre-purging or safety time, the
 If the fault is detected during operation, the burner does
 If the fault is detected during a lockout, the fault is not sig-

3.7.12 External lockout signal (S3)

The burner is equipped with an external locking signal function,
i.e. to signal (together with the integrated reset button) a burner
locking alarm.
The control box provides a command of an external lamp using
the S3 output (230Vac-0.5Amp max).

3.7.13 Hour counter function (B4)

The burner has an hour counter function for the duration of the
opening of the 1st stage oil valve and therefore the fuel consump-
tion.
The control box allows you to control an external meter through
the Hour_Counter outlet (230V AC-0.1Amp max.) of the control
box connected to pin B4 of the 7-pole socket coming from the
boiler power supply connection to the burner.
11
GB

Reset by button and remotely of the burner

If the reset button is pressed for more than 2 sec-
onds, the control box goes into visual diagnostic
mode and the indicator LED begins to blink (see
see "Fault diagnostics - lockouts" on page 10.).
WARNING
burner does not stop (the start-up sequence will continue).
stops and stays stopped with the fault signal active.
nalled and the burner cannot be reset.
When the fault disappears, the LED stops blinking.
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