PART IV: MAINTENANCE
41
Replacing the electrodes
To replace the electrodes:
Remove the cover
Disconnect the electrode cables
Loose the screws
Remove and replace the electrodes, observing the electrodes position (see previous paragraph).
Replacing the detection electrode (if provided)
To replace the ignition electrodes, proceed as follows:
1
remove the burner cover
2
disconnect the electrodes cables (
CR
);
3
loose the screw of the electrodes support (
VR
);
4
remove the electrodes and replace them paying attention to the measures shown in
figure.
Checking the detection current
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.
ATTENTION: avoid the ignition and detection electrodes to contact metallic
parts (blast tube, head, etc.), otherwise the boiler’s operation would be com-
promised. Check the electrodes position after any intervention on the com-
bustion head.
ATTENTION:
avoid
the ignition electrodes to contact metallic parts (blast tube, head, etc.), otherwise the boiler’s operation
would be compromised. Check the electrodes position after any intervention on the combustion head.
Device
Flame detector
Minimum detection signal
Siemens LMV2x/3x
QRA
70 µA (intensity of flame >24%)
CR
VR
Detection electrode
Connector
µA DC SCALE
*
Detection electrode
Flame
LME: 1
LGK: 24
*
Control box
Minimum detection signal
Siemens LME21-22
3 µA
LGK
12 µA
QRA... (-)
QRA... (+)
1
2
X10-06
+