Unigas H365X, Manual Of Installation - Use - Maintenance

Page: 43 / 116

PART IV: MAINTENANCE
43
Replacing the ignition electrodes
ATTENTION: avoid the ignition and detection electrodes to contact 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.
To replace the ignition electrodes, proceed as follows:
1 remove the burner cover;
2 loose the nuts that fasten the electrodes group to the combustion head (A);
3 disconnect the electrodes cables (B);
4 loose the security dowes of the adjusting ring nut (C);
5 shift the electrodes group back to the outside and remove the combustion head (D);
6 loose the screw of th eignition electrodes support (E);
7 remove the electrodes and replace them paying attention to the measures showed in figure (F-G);
8 reassemble the burner by fllowing the procedure in the reversed order.
A
B C
D E F
To replace the electrodes, proceed as follows:
1 remove the burner cover
C;
2 disconnect the electrodes cables;
3 emove the combustion head referring to
paragraph “Removing the combustion head”;
4 unscrew VE screws that fasten the
electrodes (see next pictures)
5 remove the electrodes and replace them
referring to the measures indicated in the
previous paragraph;
6 reconnect the electrodes cables;
7 replace the combustion head;
8 replace the burner cover.
V
V
C
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.
Control box Minimum detection signal
Siemens LMV5x
6 µA (values on display:
50%)
Connector
µA DC SCALE
X10-03.1
Detection electrode
Flame