Maintenance
39
2 Take off the removable front of the air---tight
chamber and the front panel of the combustion
chamber.
If you notice dirt on the fins of the primary heat ex-
changer (26 on page 9):
3 cover the sloping surfaces of the burner (24 on
page 9) entirely in a protective layer (sheets of
newspaper or similar).
4 Brush out the primary heat exchanger (26 on
page 9) with a bristle paintbrush.
9.5
Checking the pressurisation
in the expansion vessel
Empty the central heating system as described in
section
General access and emptying hydraulic
circuits
in the service manual and check that the
pressure in the expansion vessel is not less than
1 bar.
See also section 4.4 page 11 of this manual.
If the pressure is lower, take steps to correct the
pressure level.
9.6
Cleaning the burner
The sloping and multi---gas type burner (24 on
page 9) does not need special maintenance, but
it is sufficient to dust it with a bristle paintbrush.
To reach the burner:
1 Take off the front of the case.
2 Take off the removable front of the air---tight
chamber and the front panel of the combustion
chamber.
3 Brush out the burner with a bristle paintbrush.
9.7
Checking the flue
Have the integrity of the flue outlet pipe (40 on
page 9) air intake pipe (41 on page 9), checked
periodically, the venturi device* (39 on page 9)
cleaned and the efficiency of the flue safety circuit
checked at least once a year.
* For details see the section
Fan, venturi device
and air pressure switch
in the service manual.
For all the above maintenance operations it is ad-
visable to call an approved Service Engineer.
9.8
Drain pipe inspection
Check the soundness and integrity of the conden-
sate drain pipe.
Verify the cleaness and correct filling of the con-
densate traps.
9.9
Visual inspection of
appliance
Visually inspect all water joints, seals and connec-
tions for any evidence of leakage and retighten,
grease or replace them as necessary.
9.10
Gas pressures and tightness
Check appliance for gas tightness. Recheck oper-
ational pressures and adjust as necessary as de-
scribed in section 7.6 page 31 of this manual.
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