79
smoke.ducts.of.the.boiler..After.clean-
ing,. position. the. circulators. in. their.
original.position.(fig..15).
4.7.2 Cleaning combustion head
(fig. 16)
The.combustion.head.is.cleaned.in.the.
following.manner.(fig..16):
–. Disconnect. the. high. tension. cables.
from.the.electrodes.
–. Unscrew. the. fixture. screws. of. the.
circulator.support.and.remove.it.
–. Brush.the.propeller.delicately.(tur-
bulence.disc).
–. Carefully. clean. the. photo-resist-
ance. of. eventual. deposits. of. dirt.
deposited.on.its.surface.
–. Clean. the. remaining. components.
of.the.combustion.head.of.eventual.
deposits.
–. Upon. completion. re-assemble. the.
unit.in.the.opposite.way.as.described.
above. taking. care. to. respect. the.
indicated.measurements.
4.7.3 Substitution of nozzle
The. nozzle. should. be. substituted. at.
the.beginning.of.every.heating.system.
for.guaranteeing.the.correct.fuel.flow.
and.a.good.spray.efficiency..
The.nozzle.is.substituted.in.the.follow-
ing.manner:
–. Disconnect. the. high. tension. cables.
from.the.electrodes.
–. Loosen. the. fixture. screw. (A. fig..
16). of. the. electrodes. support. and.
remove.it.
–. Block. the. spray. door. using. a. n°19.
spanner. and. unscrew. the. nozzle.
with.a.n°16.spanner.(fig..17).
4.8
FAULT FINDING.
There. follow. a. list. of. some. reasons.
and.the.possible.remedies.for.a.series.
of.faults.which.could.happen.causing.
a. failure. or. an. irregular. function. of.
the.appliance..A.function.fault,.in.most.
cases,. causes. the. “lock. out”. signal.
on.the.control.panel.to.turn.on..When.
this.light.turns.on,.the.burner.can.only.
function. again. after. the. reset. button.
has.been.pressed;.once.this.has.been.
done.and.a.regular.ignition.occurs,.the.
failure.can.be.defined.momentary.and.
not.dangerous..
On.the.contrary,.if.the.“lock.out”.per-
sists,. then. the. cause. of. the. fault. as.
well.as.the.remedy.must.be.looked.for.
in.the.following.faults:
The burner does not ignite
–. Check.the.electric.connections.
–. Check. the. regular. fuel. flow,. the.
cleanness.of.the.filters,.of.the.noz-
zle.and.air.vent.from.the.tube.
–. Check. the. regular. spark. ignition.
and.the.proper.function.of.the.burn-
er.
The burner ignites regularly but the
flame goes out immediately
–. Check. the. flame. detection,. the. air.
calibration. and. the. function. of. the.
appliance..
Difficulty in regulating the burner
and/or lack of yield
–. Check:.the.regular.flow.of.fuel,.the.
cleanness. of. the. boiler,. the. non.
obstruction. of. the. smoke. duct,. the.
real. input. supplied. by. the. burner.
and.its.cleanness.(dust)..
The boiler gets dirty easily
–. Check.the.burner.regulator.(smoke.
analysis),.the.fuel.quantity,.the.flue.
obstruction.and.the.cleanness.of.the.
air.duct.of.the.burner.(dust).
The boiler does not heat up
–. Control. the. cleanness. of. the. shell,.
the. matching,. the. adjustment,. the.
burner. performances,. the. pre-
adjusted. temperature,. the. correct.
function.and.position.of.the.regula-
tion.stat.
–. Make. sure. that. the. boiler. is. suf-
ficiently.powerful.for.the.appliance.
Smell of unburnt products
–. Control.the.cleanness.of.the.boiler.
shell. and. the. flue,. the. airtightness.
of. the. boiler. and. of. the. flue. ducts.
(door,.combustion.chamber,.smoke.
ducts,.flue,.washers).
–. Control.the.quality.of.the.fuel.
Frequent intervention of the boiler
shutoff valve
–. Control. the. presence. of. air. in. the.
system,.the.function.of.the.circula-
tion.pumps.
–. Check. the. load. pressure. of. the.
appliance,. the. efficiency. of. the.
expansion.tanks.and.the.valve.cali-
bration.
Fig..17
4 ± 0,3 mm
A
2 - 2,5 mm
Fig..16
