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steps.shown.in.fig..13.
4.5
DISASSEMBLY
OF EXPANSION VESSEL
.
The. heating. expansion. tank. is. disas-
sembled.in.the.following.manner:
–..Make.sure.that.the.boiler.has.been.
emptied.of.water.
–..Unscrew. the. union. which. connects.
the.expansion.tank.
–..Remove.the.expansion.tank.
Before.filling.up.the.system.make.sure.
that.the.expansion.tank.is.reloaded.at.
the.pressure.of.0.8.÷.1.bar.
4.6
BURNER MAINTENANCE
(fig. 14)
To. dismantle. the. burner. from. the.
boiler.door,.remove.the.screw.(fig..14).
To. access. the. internal. part. of. the.
burner,. remove. the. air. lock. unit. held.
in.place.by.two.screws.to.the.sides.and.
remove.the.right.hand.shell,.which.is.
held. in. place. by. four. screws,. taking.
care. not. to. damage. the. O-ring. seal..
OR.
4.7
CLEANING
AND MAINTENANCE
Preventive. maintenance. and. check-
ing. of. the. efficient. operation. of. the.
equipment.and.safety.devices.must.be.
carried.out.at.the.end.of.each.heating.
season. exclusively. by. the. authorised.
technical.staff.
4.7.1
Cleaning smoke
ducts (fig. 15)
Use.an.adequate.swab.for.cleaning.the.
smoke.ducts.of.the.boiler..
After.cleaning,.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-
SCREW
VITE
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.
RONDO' 3/4 OF
ESTELLE 3/4 OF
RONDO' 5/6 OF
ESTELLE 5/6 OF
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.
Fig..14
Fig..15
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