Unigas P91A, Manual Of Installation - Use - Maintenance

Page: 36 / 105

PART IV: MAINTENANCE
36
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 othe next picture
Fig. 7
Replacing the ignition electrodes
To replace the ignition electrodes, proceed as follows:
1
remove the burner cover
2 loose the nuts that fasten the electrodes group to the combustion head (A);
3 disconnect the electrodes cables (B);
4 loose the security dowes of the adjusting ring nut (C);
5 shift the electrodes group back to the outside and remove the combustion head (D),
6 loose the screw of th eignition electrodes support (E);
7 remove the electrodes and replace them paying attention to the measures showed in figure (F-G).
8 reassemble the burner by fllowing the procedure in the reversed order.
Key
VRT Head adjusting screw
AR Threaded rod
V Fixing screw
G Gas manifold
OR ”O” ring
C Cover
T Baffle
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 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.
V
C
G AR
OR
VRT
C
AR
G
T
3÷4
8
8