Electrodes Adjustment - Unigas H455A Manual

Removing the combustion head
1 Remove the top H.
2 Remove the UV detector out of its housing: disconnect electrode cables and the light oil flexible hoses.
3 Loosen the screws V holding the gas manifold G, loosen the connectors E.
4 Some models are provided with the T baffle. Move the gas manifold ahead and remove the baffle.
5 Pull out the complete group as shown in the picture below.
6 Clean the combustion head by means of a vacuum cleaner; scrape off the scale by means of a metallic brush.
Note: to replace the combustion head, reverse the operations described above.
V
E

Electrodes Adjustment

Adjust the electrodes position, according to the quotes shown othe next picture
ATTENTION: avoid the ignition and detection electrodes to contact metallic parts (blast tube, head, etc.), otherwise the
boiler's operation would be compromised. Check the electrodes position after any intervention on the combustion head.
Cleaning/replacing the electrodes
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.
TTENZIONE
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.
PART IV: MAINTENANCE
H
G
7
VU
A = 4
B = 8
VL
37
G
T
VE