45
Adjusting the electrodes position
ATTENTION:
avoid
the ignition and detection electrodes to get in touch with metallic parts (blast tube, head, etc.), otherwise the boi-
ler’s operation would be compromised. Check the electrodes position after any intervention on the combustion head. The gap between
the ignition electrode and the ground is
4÷5 mm
.
Fig. 58
Checking the detection current
To measure the detection signals refer to the diagrams in the picture below. If the signal is less than the indicated value, check the
position of the detection electrode, the electrical contacts and if necessary replace the detection electrode.
Fig. 59
Permissible length of flame detector cable (laid separately): 3 m (core-earth 100 pF / m).
Extraneous lightExtraneous light
Extraneous light during standby (phase 12) leads to start prevention, followed by a restart.
Extraneous light during the prepurge phase leads to immediate lockout.
If extraneous light occurs during the shutdown phase, the system switches to the safety phase.
One repetition is permitted. This means that if the error occurs again the next time the system is shut down, the unit initiates lockout.
Seasonal stop
To stop the burner in the seasonal stop, proceed as follows:
1
turn the burner main switch to 0 (Off position)
2
disconnect the power mains
3
close the fuel valve of the supply line
Burner disposal
In case of disposal, follow the instructions according to the laws in force in your country about the “Disposal of materials”.
Control box
Minimum
detection signal
Siemens LMV2
4 µA (value on display:30%
)
Error code
Diagnostic code
Cause
93
3
Sensore short-circuit
Detection electrode
Ignition electrode
Ground
detection electrode
Protective earth PE
Ionization probe (ION)
QRB.../ QRC... signal voltage
QRB... GND
1
2
3
4
5
L
X10-05
QRA... (-)
QRA... (+)
1
2
X10-06
+