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D1254
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12
FINAL CHECKS
• Obscure the photocell and switch off the con-
trol devices: the burner should start and then
lock-out about 5 s after opening of the 1st
stage operation valve.
• Illuminate the photocell and switch off the con-
trol devices: the burner should start and then
go into lock-out after about 10 s.
• Obscure the photocell while the burner is in
2nd stage operation, the following must occur
in sequence: flame extinguished within 1 s,
pre-purging for about 20 ÷ 28 s, sparking for
about 5 s, burner goes into lock-out.
• Switch on control device TL followed by con-
trol device TS while the burner is operating:
the burner should stop.
MAINTENANCE
Combustion. It is required an analysis of the
flue gases at the boiler outlet. Significant differ-
ences with respect to the previous measure-
ments indicate the points where more care
should be exercised during maintenance.
Pump
D707
The pump 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 line or the
pump.
If the pump is found to be responsible, check to
make sure that the filter is not dirty. The vacuum
meter is installed up-line 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 pip-
ing.
Filters (A)
Check the following filter boxes:
• on line 1) • in pump 2) • at nozzle 3), and
clean or replace as required.
D709
If rust or other impurities are observed inside the
pump, use a separate pump to suck out any
water and other impurities that may have depos-
(C)
ited on the bottom of the tank.
Fan. Check to make sure that no dust has accu-
mulated inside the fan or on its blades, as this
condition 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 combustion head are in good
condition, positioned correctly, free of all impuri-
ties, and that no deformation has been caused
by operation at high temperatures.
Nozzles. Do not clean the nozzle openings.
Replace the nozzles every 2-3 years or when-
ever necessary. Combustion must be checked
after the nozzles have been changed.
Photocell (B). Clean the glass cover from any
dust that may have accumulated. Photocell 1)
can be removed by pulling it outward forcefully.
Flame inspection window (C) Clean the glass.
Flexible hoses. Check to make sure that the
flexible hoses are still in good condition.
Fuel tank. Every 5 years, or whenever neces-
sary, suck out any water or other impurities
present on the bottom of the tank using a sepa-
rate pump.
Boiler. Clean the boiler as indicated in its
accompanying instructions in order to maintain
D1255
all the original combustion characteristics intact,
especially the flue gas temperature and com-
bustion chamber pressure. Lastly, check the
condition of the flue gas stack.
TO OPEN THE BURNER (D)
- Switch off the electrical power
- Loosen screws 1) and withdraw the cover 2)
- Unscrew screws 3)
- Fit the two extensions 4) supplied with the
burner onto the slide bars 5)
- Pull part A backward keeping it slightly raised
to avoid damaging the disk 6) on blast tube 7).
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