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ATTENTION: avoid the ignition and detection electrodes to contact metallic parts (blast tube, head, etc.), other-
wise the boiler's operation would be compromised. Check the electrodes position after any intervention on the
combustion head.
Adjust the electrodes position according to the electrodes type installed on the burner. Follow the quotes shown on the next picture.
ER
Checking the detection current with electrode (natural gas)
To check the detection signal follow the scheme in the picture below. If the signal is less than the value indicated, check the position of
the detection electrode or detector, the electrical contacts and, if necessary, replace the electrode or the detector.
Flame detection probe
To clean/replace the detection photocell, proceed as follows:
1
Disconnect the system from the electrical power supply.
2
Shut off the fuel supply;
3
remove the photocell from its slot (see next figure);
4
clean the bulbe if dirty, taking care not to touch it with bare hands;
5
if necessary, replace the bulb;
6
replace the photocell into its slot.
Device
Siemens LMV2x/3x
Device
Siemens LMV2x/3x
EA
B
3M Open
EA: Ignition electrode
ER: Detection electrode
Flame detector
QRA
+
Flame detector
Ionization probe
Minimum detection signal
70 µA (intensity of flame >24%)
1
X10-06
QRA... (-)
2
QRA... (+)
Minimum detection signal
3 µA (values on display: 30%)
1
Protective earth PE
2
Ionization probe (ION)
3
QRB.../ QRC... signal voltage
4
QRB... GND
5
L
39
PART IV: MAINTENANCE
B
X10-05
÷ mm
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