Fuel Preheating Function; Shut-Down Test; Intermittent Operation; Recycle And Limit Of Repetitions - Riello RDB2.2R BG1 BLU 21 Installation, Use And Maintenance Instructions

6.9.3

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 re-
cycling 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
stays in 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.
6.9.4

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 section 6.9.6) and the number of possible
resets, are reset.
6.9.5

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.
It is possible to set this automatic switch off to 1 hour, (see the
section 6.12).
6.9.6

Recycle and limit of repetitions

The control box allows a recycle, 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 demand for heat during the recy-
cle, 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).
20141254
Start-up, calibration and operation of the burner
6.9.7 Presence of an extraneous light or parasite
flame
The presence of the parasite flame or the extraneous light can be
detected in the stand-by condition when the burner is stopped
and waiting for a heat request. If the presence of a flame or ex-
traneous light is detected in the "t2" state, 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 means of the blinking LED (see section
6.9.2).
6.9.8

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 repeti-
tions of the ignition transformer is one attempt every minute.
6.9.9

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.
24 GB