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
(figg. 14 - 14/a - 14/b)
To. dismantle. the. burner. from. the.
boiler.door,.remove.the.nut.(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.
–. To.dismantle.the.nozzle.holder.and.
heater.unit,.proceed.as.follows:
–. open. the. cover,. which. is. held. in.
place.by.a.screw,.and.remove.the.
heater. cables. (1. fig.. 14/a). pro-
tected.by.a.heat.resistant.sheath;.
remove.the.fairlead.and.pass.the.
cables.through.the.hole.
–. remove. the. two. cables. from. the.
ignition. electrodes. fastened. in.
place.with.a.faston.
–. loosen.the.union.(2.fig..14/a).and.
remove. the. four. screws. which.
fasten.the.collar.(3.fig..14/a).to.the.
burner.
–. To. dismantle. the. eater. or. thermo-
stat,.refer.to.figure.14/b.
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.
78
Fig..14
2
1
3
Fig..14/a
2
1
3
Fig..14/b
RONDO' 3/4 OF
ESTELLE 3/4 OF
RONDO' 5/6 OF
ESTELLE 5/6 OF
Fig..15
KEY
. 1. Control.bow.cables
. 2. Connection
. 3. Collar
KEY
. 1. Heater.stat
. 2. Cap
. 3. Heater