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L
Fig. 9.7
• Remove the nuts H (Fig. 9.5) and the
burner-fan group D.
If you notice dirt on the coil of the condens-
ing heat exchanger (19on page 23) brush
out it with a bristle paintbrush and remove
the dust with a hoover.
Fig. 9.8
Caution:
After any periodical servicing or disturbance
the combustion chamber silicon seal N (Fig.
9.8) must be fully inspected and replaced at
the discretion of the service engineer.
MAINTENANCE
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
M
Empty the central heating system as de-
scribed in section "Emptying the c.h. sys-
tem" to page 55 and check that the expan-
sion vessel pressure is not less than 1 bar.
See also section "Expansion vessel" to
page 25.
If the pressure is lower, take steps to correct
the pressure level
9.8
The burner (38on page 24) 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 56.
9.9
Have the integrity of the flue outlet pipe
(48on page 24) air intake pipe (49on page
24), checked periodically at least once a
year.
N
For all the above maintenance operations
it is advisable to call an approved Service
Engineer.
9.10 Drain pipe inspection
Check the soundness and integrity of the
condensate drain pipe.
Checking the pressurisation
in the expansion vessel
Cleaning the burner
Checking the flue
- 57 -
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