Electrodes Adjustment - Unigas RG75 Manual Of Installation - Use - Maintenance

PART IV: MAINTENANCE
Removing the combustion head
ATTENTION: perform these adjustments once the burner is turned off and cooled.
Remove the top cover C;
1
2 remove the photoresistor from its seat;
3 unscrew the revolving connectors (E in figure) on the fuel pipes (use 2 spanners to avoid loosening the connections attached to the
distributor block);
loosen VRT screw to free the threaded rod AR, then screw out the 2 screws V holding the washer R and the screw VRT again;
4
5 remove the whole assembly as shown in figure;
6 clean the combustion head and the oil gun by means of a vacuum cleaner; to scrape off the scale use a metallic brush.
Note: to replace the combustion head reverse the procedure described above.
Note: the figures below are indicative only
AR
VRT
R

Electrodes Adjustment

Important Note: Check the ignition and detection electrodes after removing/adjusting the combustion head.
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 quotes shown in the next picture.
C
RG75..AB RG75..PR/MD
E
B
34
RG75..AB RG75..PR/MD
A 9 ÷ 11 mm 9 mm
B 3.5 ÷ 4.5 mm 5 mm
C 8 mm 5 mm
D 3 mm 4 mm
-
E 2.5 mm
E