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7
Maintenance
7.1
Notes on safety for the maintenance
The periodic maintenance is essential for the good operation,
safety, yield and duration of the burner.
It allows you to reduce consumption and polluting emissions and
to keep the product in a reliable state over time.
The maintenance interventions and the calibration
of the burner must only be carried out by qualified,
authorised personnel, in accordance with the con-
DANGER
tents of this manual and in compliance with the
standards and regulations of current laws.
Before carrying out any maintenance, cleaning or checking oper-
ations:
7.2
Maintenance programme
7.2.1
Maintenance frequency
The gas combustion system should be checked at
least once a year by a representative of the man-
ufacturer or another specialised technician.
7.2.2
Checking and cleaning
The operator must use the required equipment
during maintenance.
Combustion
The optimum calibration of the burner requires an analysis of the
flue gases.
Significant differences with respect to the previous measure-
ments indicate the points where more care should be exercised
during maintenance.
Combustion head
Open the burner and make sure that all components of the
combustion head are in good condition, not deformed by the
high temperatures, free of impurities from the surroundings
and correctly positioned.
Current to the UV photocell (Fig. 43)
Clean the glass cover from any dust that may have accumulated.
Photocell is held in position by a pressure fit and can therefore be
removed by pulling it outward forcefully.
Min value for a good work: 70 µA.
If the value is lower, it can depend on:
–
exhausted photocell
–
ow current (lower than 187 V)
–
bad regulation of the burner.
In order to measure the current, use a microammeter of 100 µA
c.c., connected to the photocell, as in the scheme, with a capac-
itor of 100 µF - 1V c.c. at the same level of the instrument.
20010305
Maintenance
Disconnect the electrical supply from the burner
by means of the main system switch.
DANGER
Turn off the fuel interception tap.
DANGER
Wait for the components in contact with heat
sources to cool down completely.
D1143
Burner
Check for excess wear or loose screws, especially on cams 3)
(Fig. 35).
Clean the outside of the burner.
Clean and grease the cam variable profile.
Fan
Check to make sure that no dust has accumulated inside the fan
or on its blades, as this condition will cause a reduction in the air
flow rate and provoke polluting combustion.
Boiler
Clean the boiler as indicated in its accompanying instructions in
order to maintain all the original combustion characteristics in-
tact, especially the flue gas temperature and combustion cham-
ber pressure.
36
GB
Fig. 43
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