–. 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
(fig. 18)
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..
17). 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..18).
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.
79
Fig..18
A
CORRETTA POSIZIONE ELETTRODI
Fig..17
CORRECT.POSITION.ELECTRODES
