Unigas HR91A, Инструкция по установке, использованию и обслуживанию

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PART IV: MAINTENANCE
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Important Note: Check the ignition and detection electrodes after removing/adjusting the combustion head.
Adjust the electrodes position, according to the quotes shown othe next picture
Fig. 23
9.6
Cleaning/replacing the electrodes
To remove the oil gun, proceed as follows:
1
remove the combustion head as described on the prevoius paragraph;
2 loosen the VL screw and remove the oil gun and the electrodes: check the oil gun, replace it if necessary;
3 after removing the oil gun, unscrew the nozzle and replace it if necessary;
4 in order to replace the electrodes, unscrew the VE fixing screws and remove them: place the new electrodes being careful to
observe the measures showed on pag.: reassemlbe following the reversed procedure.
Caution : adjust the nozzle position according to the air pipe, by means of the VU screw, ance the VL screw is fastened.
9.7 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.), other-
wise the boiler’s operation would be compromised. Check the electrodes position after any intervention on the
combustion head.
ATTENTION: avoid the electrodes to get in touch with metallic parts (blast tube, head, etc.), otherwise the boiler operation
would be compromised. Check the electrodes position after any intervention on the combustion head.
Fig. 24: Detection by photocell QRA..
8
37
4
7
VU
VL
VE
Control box Minimum detection signal
Siemens LME7...
70µA with UV detector)