Final Checks; Maintenance - Riello 3470210 Installation, Use And Maintenance Instructions

(A)

FINAL CHECKS

• Obscure the flame sensor and switch on the
control devices: the burner should start and
then lockout about 5 s after opening of the 1st
nozzle operation valve.
• Illuminate the flame sensor and switch on the
control devices: the burner should start and
then go into lockout after about 10 s.
• Obscure the flame sensor while the burner is
in 2nd stage operation, the following must
occur in sequence: flame extinguished within 1
s, pre-purging for about 20 s, sparking for
about 5 s, burner goes into lockout.
• Switch off control device TL followed by con-
trol device TS while the burner is operating:
the burner should stop.

MAINTENANCE

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technician in conformity with legislation and
D482
local standards.
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excessive consumption of fuel and consequent
pollution.
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supply to the burner acting on the main switch of
the system.
Combustion
The optimum calibration of the burner requires
an analysis of the flue gases. Significant differ-
ences with respect to the previous measure-
ments indicate the points where more care
should be exercised during maintenance.
Pump
The delivery pressure must be stable at 12 bar.
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 pump is found to be responsible, check to
make sure that the filter is not dirty. The vacuom-
eter is installed upstream from the filter and con-
sequently will not indicate whether the filter is
clogged or not. Contrarily, if the problem lies in
the suction line, check to make sure that the fil-
ter is clean and that air is not entering the piping.
Filters (A)
Check the following filter boxes:
• on line 1) • in the pump 2) • at the nozzle 3),
and clean or replace as required.
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.
Fan
Check to make sure that no dust has accumu-
lated inside the fan or on its blades, as this con-
dition will cause a reduction in the air flow rate
and provoke polluting combustion.
Combustion head
Check to make sure that all the parts of the com-
bustion head are in good condition, positioned
correctly, free of all impurities, and that no defor-
mation has been caused by operation at high
temperatures.
Nozzles
Do not clean the nozzle openings.
It is advisable to replace nozzles every year dur-
ing regular maintenance operations.
The change of nozzle requires the combustion
to be controlled.
Flame sensor
Clean the glass cover from any dust that may
have accumulated.To extract the flame sensor 4)
(A)p.3 pull it outward forcefully. it is only pressed in
Flexible hoses
Check to make sure that the flexible hoses are
still in good condition and that they are not
crushed or otherwise deformed.
Fuel tank
Approximately every 5 years, or whenever nec-
essary, suck any water or other impurities pres-
ent on the bottom of the tank using a separate
pump.
Boiler
Clean the boiler as indicated in its accompany-
ing instructions in order to maintain all the origi-
nal combustion characteristics intact, especially
the flue gas temperature and combustion cham-
ber pressure.
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The burner requires periodic maintenance
carried out by a qualified and authorised
Periodic maintenance is essential for the
reliability of the burner, avoiding the
Before carrying out any cleaning or con-
trol always first switch off the electrical