Maintenance
41
24
Fig. 9.4
9.5
Combustion analysis check
If it is necessary to carry out a combustion analysis
remove the plugs indicated in Fig. 9.1.
Reference figures are given in the sections 4.5,
4.6, 4.7 of this manual (Flue gas figures).
9.6
Cleaning the primary heat
exchanger
1 Take off the front of the case.
2 Take off the removable front of the sealed
chamber and the front panel of the combustion
chamber.
If you notice dirt on the fins of the primary heat ex-
changer (43 on page 13):
3 cover the sloping surfaces of the burner (40 on
page 13) entirely in a protective layer (sheets of
newspaper or similar).
4 Brush out the primary heat exchanger (43 on
page 13) with a bristle paintbrush.
9.7
Checking the pressurisation
in the expansion vessel
Empty the central heating system as described in
section 9.4 of this chapter and check that the pres-
sure in the expansion vessel is not less than 1 bar.
See also section 4.4 page 15 of this manual.
If the pressure is lower, take steps to correct the
pressure level.
9.8
Cleaning the burner
The sloping and multi---gas type burner (40 on
page 13) 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 sealed
chamber and the front panel of the combustion
chamber.
3 Brush out the burner with a bristle paintbrush.
9.9
Checking the flue
Have the integrity of the flue outlet pipe (49 on
page 14) air intake pipe (50 on page 14), checked
periodically, the air pressure sensor* (19 on page
13) and the efficiency of the flue safety circuit
checked at least once a year.
* For details see the section
Fan and air pressure
sensor
in the service manual.
For all the above maintenance operations it is ad-
visable to call an approved Service Engineer.
9.10
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.
9.11
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.
9.12
Gas pressures and tightness
Check appliance for gas tightness. Recheck oper-
ational pressures and adjust as necessary as de-
scribed in section 7.7 page 35 of this manual.
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