Service manual

Service manual E000129004
11
2.12. Glow plug and ionisation rod
F Removal
Warning: isolate the boiler from the mains
electricity supply before removing any covering or
component.
1 Remove the cover (section 1.4).
2 Disconnect the connector A (glow plug) or B (ionisation
rod) (Fig. 31).
3 To remove the glow plug unscrew the screw C.
4 To remove the ionisation rod unscrew the screws D.
5 Re-assemble the component carrying out the removal
operations in reverse order.
Fig. 31
2.13. D.h.w. heat exchanger
During a d.h.w. draw off the d.h.w heat exchanger allows
the instantaneous transfer of heat from the main circuit
to the water destined for d.h.w use.
When there is no draw off, the exchanger works as a
small d.h.w. tank and it is kept at the desired tempera-
ture (d.h.w. hold temperature) by means of the electronic
control system.
F Removal
Warning: isolate the boiler from the mains
electricity supply before removing any covering or
component.
1 Remove the cover (section 1.4).
2 Empty the main circuit (section 1.5)
3 Empty the d.h.w. circuit (section 1.6)
4 Unscrew the screws A and move away the plate B (Fig.
32).
5 Remove the d.h.w. heat exchanger temperature sensor
(section 2.7).
6 Unscrew the inlet and outlet domestic water
connections C.
Fig. 32
7 Lower the control panel (section 1.7).
8 Disconnect the wirings of the diverter valve, pump,
return water temperature sensor and main circuit
pressure sensor.
9 Disconnect the pipe D (Fig. 33).
10 Completely unscrew the connections E, F and G (Fig.
33) and remove the complete hydraulic group.
11 Unscrew and remove the automatic air vent H.
Fig. 33
12 Move the lower part of the exchanger towards the
front of the boiler and lower it until its top is free from
the frame of the boiler.
13 Move the top of the exchanger towards the front of
the boiler, lift and remove it.
14 Re-assemble the exchanger and the other parts
carrying out the removal operations in reverse order.
Type
30K