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8.5.1 - Bulb on the heating output tube
- extract the bulb positioned in the pocket (28,
fig. 42) on the heating output tube,
- unscrew the 2 fixing screws (K, fig. 42) from the
protection plate (9, fig. 42),
- remove the protection plate (9, fig. 42),
- unscrew the 4 fixing screws (L, fig. 42) from the
control panel (1, fig. 42),
- remove the control panel (1, fig. 42) to gain ac-
cess to the thermometer,
- remove the faulty appliance and replace it,
- insert the bulb in the pocket and clip it on again
onto the heating outlet tube.
8.5.2 - Bulb in the condensor
- Extract the bulb from the pocket (34, fig. 42) from
the condensor after removing the retaining clip
(M, fig. 44),
- unscrew the 2 fixing screws (K, fig. 42) from the
protection plate (9, fig. 42),
- remove the protection plate (9, fig. 42),
9 - DRAINING
Fig. 45
- unscrew the 4 fixing screws (L, fig. 42) from the
control panel (1, fig. 42),
- remove the control panel (1, fig. 42) to gain ac-
cess to the thermostat,
- remove the faulty appliance and replace it,
Reposition the bulb in the entrance of
!
the pocket (34, fig. 44), as shown in
fig. 44 using the retaining clip (M,
fig. 44) thus preventing the accidental
removal of the bulb
Fig. 44
34
- Cut off the power supply,
- Close the fuel inlet valve,
- Close the heating output/return valves (if they
exist),
- Connect a hose pipe to the drain cock (7) after re-
moving the plug,
- Open the drain cock with the plug tip provided for
this purpose.
Make sure that the bleed is open as soon
!
as the pressure gauge indicates zero
pressure to allow air to enter the boiler
shell.
When bleeding the installation, provide
an air inlet at a high point (radiator
bleed).
CAUTION: Risk of system faults from ex-
!
cessive flue gas temperature!
The drain valve connection (7) must ne-
ver be used for any other purpose than to
drain the boiler shell.
- 39 -
MAINTENANCE
15
M
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