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along its travel. This will keep both
outlets, heating and sanitary, par-
tially open.
4.4
DISASSEMBLY
OF OUTER CASING
The. shell. can. be. completely. disas-
sembled.for.an.easy.maintenance.of.
the. boiler. by. following. the. numeric.
steps.shown.in.fig..14.
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. con-
nects.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
To. dismantle. the. burner. from. the.
boiler.door,.remove.the.nut.(fig..15).
–. 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. fol-
lows:
–. open.the.cover,.which.is.held.in.
place. by. a. screw,. and. remove.
the. heater. cables. (1. fig.. 15/a).
protected. 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..15/a).and.
remove. the. four. screws. which.
fasten. the. collar. (3. fig.. 15/a). to.
the.burner.
–. To. dismantle. the. eater. or. ther-
mostat,.refer.to.figure.15/b.
78
4
5
2
1
3
KEY
. 1. Control.bow.cables
. 2. Connection
. 3. Collar
2
6
3
1
Fig..14
Fig..15
Fig..15/a
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