56
COMMISSIONING AND MAINTENANCE
MAIN BURNER FUNCTIONS
FUEL PRE-HEATING FUNCTION
The burner has an oil pre-heating function. When the boiler
thermostat requests a burner start-up, the burner waits for the
contacts of pre-heating thermostat (K), located at the oil nozzle
holder, to close.
If the startup or pre-heating thermostat does not close after 600
seconds, the burner controller locks out.
If the flame goes out during operation, the burner carries out
the recycle again if the contact of the start-up thermostat (or the
pre-heating one, K) is closed.
If the flame goes out during normal functioning and the contacts
of the startup or pre-heating thermostat (K) are open, the burn-
er remains in the purge phase for the duration of post-purging
time (if programmed), then purging stops and the burner waits
for the contacts of the startup or pre-heating thermostat (K) to
close before restarting pre-purging time.
SHUTDOWN TEST
If the reset button is pressed during operations for more than
5 seconds and less than 10 seconds, the burner switches off,
the light oil valve closes, the flame goes out and the start-up
sequence restarts.
If the test is enabled, the number of repetitions of the start se-
quence (see "CYCLING AND THE SEQUENCE REPETITION LIMIT" on
page 56) and the number of possible restarts (see "PROTECTION
RESET" on page -|XR_Numero_Pagina-c55929a1-4771-4427-9fc1-
3fe3f8ed428b|-), are restored.
CONTROLLED SHUTDOWN AND RESTART
After 24 hours of continuous functioning, the controller initiates
a controlled shutdown followed by a re-start to ensure that the
flame detector is not faulty.
You can reduce reduced shutdown and restart time to 1 hour
(see "Programming Mode").
CYCLING AND THE SEQUENCE REPETITION LIMIT
The burner controller has a cycling function. This means that
the controller will repeat the complete startup sequence up to 3
times if the flame goes out during normal functioning.
If the flame fails 4 times during operations, this will cause the
burner to lock out.
If there is a new heat request during the recycle, the 3 attempts
are reset at the next request of the limit thermostat (TL).
NOTE:
After 510 seconds of continuous operation, a further attempt is
made, if necessary.
When the power supply is disconnected, when there is a new
heat request, all possible restart attempts are reset to 3 (maxi-
mum 3).
EXTRANEOUS LIGHT OR FALSE FLAME SIGNAL
The presence of a parasite flame or extraneous light can be de-
tected in the stand-by state when the burner is stopped and
waiting for a heat request or during preheating.
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 extraneous light or a false flame signal is detected when the
fan motor is running during pre-purging, the burner stays in
purge mode until the light or flame signal stops. If this does not
occur within 25 seconds, the burner locks out.
If, during pre-purging, a parasite flame or extraneous light is
detected, the pre-purging time of 15 seconds is reset to zero and
the time for checking the presence of the parasite flame or ex-
traneous light starts (the motor continues to ventilate).
The function is cumulative and can be performed up to 2 times.
If the parasite flame or extraneous light disappears before 25
seconds, the pre-purging time starts; if the parasite flame or
extraneous light occurs again, the pre-purging time is reset to
zero and the 25-second count for checking the presence of the
parasite flame or extraneous light restarts.
The burner also locks out if extraneous light or a false flame
signal is detected three times.
If, during the recycle due to flame loss while operating and the
consequent repetition of the start-up sequence, the parasite
flame or the extraneous light is detected, the 25 seconds control
countdown starts.
The fault is indicated by the flashing of the LED (see paragraph
"Fault diagnosis - lockouts" on page 54).
PRE- AND POST-IGNITION PHASE
During pre-ignition, the ignition electrode switches on 2 sec-
onds before the fuel oil valve opens.
During post-ignition, the ignition electrode switches off 3 sec-
onds after the end of safety time.
Ignition remains active throughout safety time.
9
In the event of continuous recycling or heat requests that
are close together, the maximum allowed number of cycle
repetitions for the ignition transformer is one every minute.
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
control box.
RESET / REMOTE RESET BUTTON ERROR
In any state (ON/OFF thermostat), if the release button or the
remote release button fails or remains pressed for more than 60
seconds, the fault is indicated by the flashing led (see paragraph
“Fault diagnosis - lockouts” on page 54) as long as it is present.
− This fault is only displayed and the led stops blinking
when the fault disappears.
− If the fault is detected during pre-purging, preheating or
safety time, the burner does not stop and the start-up
sequence continues.
− If the fault is detected during a lockout, the fault is not
signalled and the burner cannot be reset.
− If the fault is detected during operation, the burner does
not stop.
