22
After the disassembling the burner plate, the combustion head can be removed as follows:
5. unscrew the fixing screw VT
6. disconnect the ignition cable CA; unscrew the fixing nuts D and remove the combustion head from its housing;
7. adjust the electrodes; to replace them, if necessary, disconnect the cables and unscrew VE;
8. remove the electrodes and replace them;
9. clean the combustion head by means of a vacuum cleaner; use a metallic brush to scrape off the scale;
10. reassemble all the items in the reversed order, observing the electrodes position (see next paragraph).
1. Before disassembly the nozzle and the electrodes, disconnect the cables CV (Fig. 10), measure the positions quoted
in Fig. 11 and make a note in the table on Tab. 3.
2. Unscrew the V screw that fastens the combustion head and remove the head from the nozzle-holder (Fig. 10)
3. Unscrew the VE screw that fastens the electrodes, remove and clean or replace them;
In order to remove the nozzle, it is important to use two wrenches as shown in Fig. 10, to avoid damaging the
burner component plate!
4. clean or replace the nozzle
5. reassemble tall the elements, remember to fasten the V and VE screws and re-connect the cables CV (Fig. 10),
respecting the positions measured previously and quoted on the table below;
6. reassemble the components plate and the burner’s cover.
Fig. 10
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.
ATTENTION: check that the factory-set values are observed (Tab. 3). If it was necessary to change that
values according to the utilisation, make a note of them in the table below, as for the maintenance operations.
A B C D
60°
8
4
4 ÷ 6
6
45°
10
5
4 ÷ 6
6
....
.... .... .... ....
....
.... .... .... ....
Tab. 3