• Disconnect the connector of the fan M by
pressing the plastic hook N placed on the
rear side of the connector (Fig. 9.7).
M
Fig. 9.7
• Remove the nuts F (Fig. 9.5) and the burn-
er-fan group I.
If you notice dirt on the coil of the condens-
ing heat exchanger (19on page 22) brush
out it with a bristle paintbrush and remove
the dust with a hoover.
Fig. 9.8
MAINTENANCE
Caution:
After any periodical servicing or disturbance
the combustion chamber silicon seal O (Fig.
9.8) must be fully inspected and replaced at
the discretion of the service engineer.
After any disturbance to the chamber door
seal the appliance must undergo a full ana-
lytical combustion performance check.
Reassemble the parts carrying out the re-
moval operations in reverse order.
9.7
N
Empty the central heating system as de-
scribed in section "Emptying the c.h. sys-
tem" to page 53 and check that the expan-
sion vessel pressure is not less than 1 bar.
See also section "Expansion vessel" to
page 28.
If the pressure is lower, take steps to correct
the pressure level
9.8
The burner (38on page 23) does not need
special maintenance, but it is sufficient to
dust it with a bristle paintbrush.
To reach the burner do the operations de-
scribed in the section "Cleaning the con-
densing heat exchanger and burner" to
page 54.
9.9
Have the integrity of the flue outlet pipe
(48on page 23) air intake pipe (49on page
O
23), checked periodically at least once a
year.
For all the above maintenance operations
it is advisable to call an approved Service
Engineer.
Checking the pressurisation
in the expansion vessel
Cleaning the burner
Checking the flue
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