Unigas HR1025, Manual Of Installation - Use - Maintenance

Page: 41 / 83

PART IV: MAINTENANCE
41
Replacing the ignition electrode
To replace the ignition electrode, proceed as follows:
1
remove the burner cover
2 disconnect the electrode (E) cable (CE);
3 remove the combustion head (see par. “Removing the combustion head”);
4 loose screw (B) that fasten the ignition electrode (E) to the burner pilot (P);
5 remove the electrode and replace it, referring to the values quoted on 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 electrode to get in touch with metallic parts (blast tube, head, etc.), otherwise the boiler
operation would be compromised. Check the electrode position after any intervention on the combustion head.
Fig. 19: Detection by photocell QRA.. Fig. 20: Detection by photocell QRA..
P E CE B
Control box Minimum detection signal
Siemens LME7...
70µA with UV detector)
Siemens LFL1.3..
70µA with UV detector)
TERMINAL BOARD
MC