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MAINTENANCE
MAINTENANCE
Fig. 9.8
N
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.
After any disturbance to the chamber door
seal the appiance must undergo a full ana-
lytical combustion performance check.
Reassemble the parts carrying out the re-
moval operations in reverse order.
9.6 Checking the pressurisation
in the expansion vessel
Empty the central heating system as de-
scribed in section "Emptying the c.h. sys-
tem" to page 46 and check that the expan-
sion vessel pressure is not less than 1 bar.
See also section "Expansion vessel" to
page 20.
If the pressure is lower, take steps to correct
the pressure level
9.7 Cleaning the burner
The burner (32on page 17) 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 47.
9.8 Checking the flue
Have the integrity of the flue outlet pipe
(39on page 17) air intake pipe (40on page
17), checked periodically at least once a
year.
For all the above maintenance operations
it is advisable to call an approved Service
Engineer.
9.9 Drain pipe inspection
Check the soundness and integrity of the
condensate drain pipe.
Verify the cleaness and correct filling of the
condensate traps.
9.10 Visual inspection of appliance
Visually inspect all water joints, seals and
connections for any evidence of leakage
and retighten, grease or replace them as
necessary.
9.11 Gas pressures and soundness
Check appliance for gas soundness. Re-
check operational pressures as described
in section "Checking the gas supply pres-
sure" to page 38.
9.12 Water inhibitor concentration
Where chemical products are used the level
of water treatment should be checked on an
annual basis and re treated after full or par-
tial drain down. A conductivity meter can be
used to check the correct concentration of
inhibitor in the heating water.