21
2902812
GB
Maintenance
9.1
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.
Before carrying out any maintenance, cleaning or checking oper-
ations:
9.2
Maintenance programme
9.2.1
Maintenance frequency
The combustion system should be checked at least once a year
by a representative of the manufacturer or another specialised
technician.
9.2.2
Maintenance position
Access to the combustion head, diffuser disc / electrodes
unit and nozzle
Remove the burner out of the boiler, after loosing the fixing
nut to the flange.
Hook the burner to the flange 1), by removing the combus-
tion head 2) after loosing the fixing screws 3).
Remove the diffuser disc-holder assembly 9) from the noz-
zle-holder 8) after loosing its fixing screw.
Screw the nozzle 10).
9.2.3
Checking and cleaning
Combustion head
Open the burner and make sure that all components of the com-
bustion head are in good condition, not deformed by the high
temperatures, free of impurities from the surroundings and cor-
rectly positioned.
Clean the combustion head in the fuel exit area, on the diffuser
disc.
Burner
Check for excess wear or loose screws and clean the outside of
the burner.
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.
Photoresistance
Clean the photoresistance.
Electrodes
Check the correct position of electrodes.
Nozzles
It is advisable to replace nozzles every year during regular main-
tenance operations.
Do not clean the nozzle openings; do not even open them.
Filters
Check the filtering baskets on line and at nozzle present in the
system. Clean or replace if necessary.
If rust or other impurities are observed inside the pump, use a
separate pump to lift any water and other impurities that may
have deposited on the bottom of the tank.
Pump
Delivery pressure must correspond with the table on Tab. E at
page 18. Please check that the supply line and filters are clear.
The use of a pump vacuum gauge will assist in this. This measure
permits the cause of the anomaly to be traced to either the suc-
tion line or the pump.
If the problem lies in the suction line, check to make sure that the
filter is clean and that air is not entering the piping.
9
Maintenance
DANGER
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
standards and regulations of current laws.
DANGER
disconnect the electricity supply from the burner
by means of the main switch of the system;
DANGER
isolate the fuel supply.
Fig. 22
4
1
D8057
D8056
2
3
5
6
