Riello 1311 T2, Modulating Operation, Page: 37 / 60

35
20040170
GB
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.
Before carrying out any maintenance, cleaning or checking oper-
ations:
7.2 Maintenance programme
7.2.1 Maintenance frequency
7.2.2 Checking and cleaning
Combustion
Carry out an analysis of the combustion discharge gases.
Significant differences with respect to the previous check indicate
the points where more care should be exercised during mainte-
nance.
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.
Voltage on the QRI cell
Minimum value for correct operation: 3.5 Vdc (value on AZL dis-
play at about 50%).
If the value is lower, it could be due to:
–
cell not positioned correctly
– low voltage (lower than 187 V)
– bad regulation of the burner
In order to measure, use a voltmeter with a 10 Vdc scale connect-
ed as in the diagram (Fig. 37).
Burner
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.
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.
Pump
The delivery pressure must comply with Tab. E, pag. 19.
The depression must be less than 0.45 bar.
Unusual noise must not be evident during pump operation.
If the pressure is found to be unstable or if the pump runs noisily,
the flexible hose must be detached from the line filter and the fuel
must be sucked from a tank located near the burner.
This measure permits the cause of the anomaly to be traced to
either the suction piping or the pump.
If the problem lies in the suction line, check the filter is clean and
that air is not entering the piping.
Filters
(Fig. 38)
Check the filtering baskets on line 1) and at nozzle 2) 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.
7 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 electrical supply from the burner
by means of the main system switch.
DANGER
Close the fuel interception tap.
Wait for the components in contact with heat
sources to cool down completely.
The gas combustion system should be checked at
least once a year by a representative of the man-
ufacturer or another specialised technician.
The operator must use the required equipment
during maintenance.
GAS OIL OPERATION
0...10 V
Ri > 10 M :
X10-02 / 6
X10-02 / 4
X10-02 / 2
LMV...
+
D9174
Fig. 37