53
Fig. 18.43
Fig. 18.44
Fig. 18.45
Fig. 18.46
Fig. 18.47
Fig. 18.48
Fig. 18.49
M
N
18.4.8 Removing the heat exchanger
1.
Carry out step
18.2.1
;
2.
Remove the air gas manifiold as in
step
18.4.2
(Fig. 18.43)
;
3.
Unscrew the three bolts “
M
” from the
main heat exchanger (Fig. 18.44);
4.
Remove the flow and return pipes
and the condense drain pipe from
the heat exchanger. (Fig. 18.45);
5.
Remove the heat exchanger from
the boiler by sliding out. (Fig. 18.46);
6.
Reassemble in reverse order.
18.4.9 Removing the spark generator
1.
Carry out step
18.2.1
;
2.
Disconnect the earth cable from the
ignition electrode. (Fig. 18.47)
;
3.
Disconnect the ignition electrode,
live, neutral and earth cables from
the ignitor. (Fig. 18.48);
4.
Remove the two screws “
N
” from
the ignitor and remove (Fig. 18.49);
5.
Reassemble in reverse order.
