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18.2 Access to the Combustion Chamber
D
Fig. 49
Fig. 50
Fig. 51
Fig. 52
Fig. 53
Fig. 54
Fig. 55
Fig. 56
Fig. 57
E
18.2.1 Removing the air gas assembly
1
.I
s
olate the gas supply to the boiler;
2. Carry out step 18.1.1;
3. Remove the silencer (Fig. 49);
9. Remove the air gas assembly and
combustion chamber front (Fig. 57);
10. Reassemble in reverse order.
4. Disconnect the detection electrode
c
able (Fig. 50);
5. Remove the earth cable from the
ignition electrode (Fig. 51), and
remove the ignition electrode cable
from the ignitor (Fig. 52)
6. Unplug the gas valve and fan connectors (Figs. 53 and 54);
7. Unscrew the 4 nuts D on the
combustion chamber (Fig. 55);
8. Unscrew the gas valve nut E
(Fig. 56);