Electrical wiring
20127402
20
GB
7.5.3
Fuel preheating function
The burner is equipped with the fuel pre-heating function, in the
presence of a start request from the heat request thermostat of
the boiler, the burner awaits the closure of the start-up thermostat
(or pre-heating, K) positioned on the nozzle holder.
If the start up thermostat (or the pre-heating one, K) does not
close within 600 seconds, the burner goes into lockout mode.
If the flame goes out during operation, the burner carries out the
recycle if the contact of the start up thermostat (or the pre-heating
one, K) is closed.
If the flame goes out during operation and the contact of the start-
up thermostat (or the pre-heating one, K) is open, the burner con-
tinues purging for the duration of the post-purging time (if en-
gaged), the purging stops and the burner remains in standby
waiting for the closure of the contact of the start-up thermostat (or
the pre-heating one, K) to restart with the pre-purging time.
7.5.4
Shut-down test
If, during operations, the reset button is pressed for longer than 5
seconds and less than 10 seconds, (so as not to go to the next
menu) the burner switches off, the oil valve closes, the flame is
extinguished and the starting sequence restarts.
If the switch off test is enabled, the number of repetitions of the
start up sequence (see
“Recycle and limit of repetitions”
) and
the number of possible resets (see paragraph
on page 21), are reset.
7.5.5
Intermittent operation
After 24 hours of continuous operation, the control box starts the
automatic switch-off sequence, followed by a restart, in order to
check for a possible fault with the flame sensor.
This automatic switch-off can be fixed at 1 hour, (see paragraph
7.5.6
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 during 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).
7.5.7
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 extrane-
ous 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 re-
set and the countdown of 25 seconds for checking for the pres-
ence 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
7.5.8
Pre and post spark ignition
In the pre-spark ignition time the ignition device starts 2 seconds
before the oil valve opens.
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.
NOTE:
In case of continuous recycling or heat requests close to
one another, the maximum permissible number of cycle rep-
etitions of the ignition transformer is one attempt every min-
ute.
7.5.9
Reset protection
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.
NOTE:
The burner can be reset only 5 times consecutively, then
power supply has to be disconnected for a new 5 reset pos-
sibilities.
The burner can only be reset if power supply is applied to the
control box.
Summary of Contents for 8099157
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