Unigas G270X, Руководство по установке, использованию и обслуживанию

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PART IV: MAINTENANCE
38
Removing the combustion head

Remove the cover C .

remove the electrodes cables;

unscrew the 3 screws V which hold in position the gas manifold G and pull out the complete group as shown in the picture below.

Clean the combustion head by a compressed air blow or, in case of scale, scrape it off by a scratchbrush.
Note: to replace the combustion head reverse the procedure described above having care to place correctly the O ring ( OR ) between
burner and gas manifold.
Replacing the electrodes
Attention: before adjusting the combustion head, turn the burner off and wait until it gets cold.
ATTENTION: avoid the ignition and detection electrodes to contact metallic parts (blast tube, head, etc.), otherwise the boi-
ler’s operation would be compromised. Check the electrodes position after any intervention on 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.
C
G
AR
V
C
G A
O
VR
Key
VRT Head adjusting screw
AR Threaded rod
V Fixing screw
G Gas manifold
OR ”O” ring
C Cover
C
V
To replace the electrodes, proceed as follows:
1
remove the burner cover C; r
2 disconnect the electrodes cables;
3 emove the combustion head referring to paragraph
“Removing the combustion head”;
4 unscrew VE screws that fasten the electrodes (see
next pictures)
5 remove the electrodes and replace them referring to
the measures indicated in the previous paragraph;
6 reconnect the electrodes cables;
VB - Detection electrode
VB - Ignition electrode
To replace the ignition electrodes, proceed as follows:
1
remove the burner cover
2 disconnect the electrodes cables;
3 loose the screw VB that fasten the electrodes group to the combustion
head;
4 remove the electrodes and replace them paying attention to the measures
showed in previous paragraph.
Reassemble the burner by fllowing the procedure in the reversed order.