47
•
Disconnect the flue from the top of
boiler as described in Section 4.7.
•
Remove boiler from wall and
slacken two screws (1, fig. 76).
•
Slide expansion vessel upwards
and out of boiler casing.
•
Reassemble in reverse order.
•
Re-mount the boiler (see Section
4.6).
•
Re-commission the boiler
(see Section 5).
OR
A suitable replacement expansion ves-
sel can be fitted externally to the boi-
ler as described in Section 3.7.5 (if
possible on the central heating return
in an accessible position). In these cir-
cumstances, the replacement expansi-
on vessel must be correctly sized igno-
ring the original expansion vessel
which can be left in position on the
boiler.
7.12 Replacement of main
safety isolating
transformer
•
Isolate boiler from the electricity
supply.
•
Remove front casing as in Section
7.1.3
•
Lower front control panel as in
Section 7.1.6.
•
Remove condensate trap as in
Section 7.7.
•
Remove back of control box by
undoing the 2 screws (1, fig. 78).
•
Unplug transformer plugs (1, fig.
79) and remove from control box.
fig. 78
GW 455/0
fig. 79
GW 436/0
