PART IV: MAINTENANCE
34
Removing the combustion head
1
Remove the top cover
C
;
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);
4
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;
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
Electrodes Adjustment
Important Note: Check the ignition and detection electrodes after removing/adjusting the combustion head.
Adjust the electrodes position, according to the quotes shown in the next picture.
ATTENTION: perform these adjustments once the burner is turned off and cooled.
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.
C
AR
VRT
R
E
B
E
A
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
RG75..PR/MD
RG75..AB
