Riello 2916463 Manuel D'entretien page 28

Maintenance
7
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-
tents of this manual and in compliance with the
DANGER
standards and regulations of current laws.
7.2 Maintenance programme
Maintenance frequency
The gas combustion system should be checked at least once
a year by a representative of the manufacturer or another
specialised technician.
Checking and cleaning
Combustion
Carry out an analysis of the flue gases.
Significant differences with respect to the previous measure-
ments indicate the points where more care should be exer-
cised during maintenance.
Gas leaks
Make sure that there are no gas leaks on the pipes between
the gas meter and the burner.
Gas filter
Replace the gas filter when it is dirty.
Flame inspection window
Clean the glass of the flame inspection window.
Fig. 37
6463
D484
26
Before carrying out any maintenance, cleaning or checking op-
erations:
disconnect the electricity supply from the burner by
means of the main switch of the system;
DANGER
close the fuel interception tap;
DANGER
Combustion head
Open the burner and make sure that all the components of
the combustion head are:
- undamaged;
- not deformed due to high temperature;
- free of ambient dirt or dust;
- free of rusted materials;
- adequately positioned.
Make sure that the gas outlet holes for the start-up, on the
combustion head distributor, are free of dirt or rust deposits.
If in doubt, disassemble the elbow 7)(Fig. 38).
Servomotor
Release cam 4)(Fig. 28) from the servomotor, rotating notch
2)(Fig. 28) by 90° and manually check that it rotates smoothly
backwards and forwards.
Constrain cam 4)(Fig. 28) again.
Burner
Check for excess wear or loose screws in the mechanisms
controlling the air damper and the gas butterfly valve. Also
make sure that the screws securing the electrical leads in the
burner connections are fully tightened.
Clean the outside of the burner, taking special care with the
articulated couplings and cam 4)(Fig. 28).
Combustion
Adjust the burner if the combustion values found at the begin-
ning of the operation do not comply with the regulations in
force or, at any rate, do not produce good combustion.
Use the appropriate card to record the new combustion val-
ues; they will be useful for subsequent controls.
GB