Control Sequence In Case Of Failure; Intermittent Operation; Presence Of An Extraneous Light Or Parasite Flame; Reset Control Box - Riello RS5 Installation, Use And Maintenance Instructions

5.12.2 Control sequence in case of failure

If a lockout occurs, the oil valve outputs, the fan motor and the
ignition device are switched off within 1 second. If locked out, the
flame control remains locked and the red light on the unlock
button lights up.
Cause
Power supply interruption
Power supply voltage below the undervoltage threshold
Extraneous light during the pre-purging time (t1)
Extraneous light during standby time (tw)
No flame at the end of the safety range (TSA)
Flame signal loss during the operation
Air pressure switch does not close within 5 seconds of starting the motor
Air pressure switch blocked in working position
Air pressure switch blocked in rest position

5.12.3 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.
5.12.4 Presence of an extraneous light or parasite
flame
If the presence of a flame or extraneous light is detected also in
the "tw" stage, the motor does not start until the flame signal has
disappeared or until lockout has been reached, which occurs
after a maximum of 30 sec.
If after the start of the fan, during the pre-purging, an extraneous
light or a parasitic flame is detected motor, the lockout condition
is reached.

5.12.5 Reset control box

The burner can be unlocked by pressing, for at least 1 second
(and less than 3 seconds), the reset button integrated in the flame
control box.
Unlocking occurs only if the control box is
powered and there is no undervoltage.
WARNING
In the event of the burner not restarting it is
necessary to check if the limit thermostat (TL) is
closed and gas pressure switch (PGMin).
WARNING

5.12.6 Check the power supply voltage

The control box automatically measures the mains voltage.
If the voltage is less than 165 V, the burner stops, interrupts the
operating cycle and remains in stand-by, signalling a fault.
The fault is indicated by the blinking LED (see paragraph "Faults
- Possible causes - Solutions" on page 27).
The burner restarts when the voltage exceeds approx. 175V.
Installation
The flame control box can be unlocked immediately.
The lockout status is maintained even in the event of a power
failure.
Reaction
Restart
Safety shutdown followed by restart
Lockout immediate
Lockout from start, after maximum 30 seconds a
lockout occurs
Lockout at the end of safety time (TSA), flash code
Lockout immediate
Lockout
Lockout from start, after maximum 65 seconds
Lockout from start, after maximum 180 seconds
from t10

5.12.7 Ionisation current

The recommended minimum for operating the burner is 5 µA.
The burner normally supplies a higher current value, so that no
check is needed.
In any event, if you want to measure the ionisation current, you
need to open the connector (Fig. 18) on the red wire and insert a
microammeter.
20157127
23 GB
1
Tab. N
Fig. 18
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