- 39 -
MAINTENANCE
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),
- 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
9 - DRAINING
- 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.
!
FC
X
-5
4
-3
34
15
M
Fig. 44
F
C
X
-55-U
Fig. 45
!
!
