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tor. reduces. water. supply. conse-
quently. increasing. the. relevant.
temperature.
-..Turn. counter-clockwise. and. the.
regulator. increases. water. supply.
consequently. reducing. the. rele-
vant.temperature.
2.2.3 Characteristics
of feedwater
To.prevent.lime.scale.and.damage.to.
the. tap. water. exchanger,. the. water.
supplied. should. have. a. hardness. of.
no.more.than.20°F..
In. all. cases. the. water. used. should.
be. tested. and. adequate. treatment.
devices.should.be.installed..
To.prevent.lime.scale.or.deposits.on.
the. primary. exchanger,. the. water.
used. to. supply. the. heating. circuit.
should.must.be.treated.in.accordan-
ce.with.UNI-CTI.8065.standards..
It. is. absolutely. essential. that. the.
water. is. to. be. treated. in. the. fol-
lowing.cases:
–. Very.extensive.systems.(with.high.
contents.of.feedwater).
–. Frequent. addition. of. makeup.
water.into.the.system.
–. In.case.it.is.necessary.to.empty.the.
system.either.partially.or.totally.
2.3
CONNECTING
UP FLUE
The. flue. is. of. fundamental. impor-
tance. for. the. proper. operation. of.
the.boiler;.if.not.installed.in.compli-
ance.with.the.standards,.starting.the.
boiler.will.be.difficult.and.there.will.
be. a. consequent. formation. of. soot,.
condensation.and.encrustation..
A.flue.therefore.must.satisfy.the.fol-
lowing.requirements:
–. be. constructed. with. waterproof.
materials. and. resistant. to. smoke.
temperature.and.condensate;
–. be. of. adequate. mechanical. resil-
ience.and.of.low.heat.conductivity;
–. be. perfectly. sealed. to. prevent.
cooling.of.the.flue.itself:
–. be.as.vertical.as.possible;.the.ter-
minal. section. of. the. flue. must. be.
fitted.with.a.static.exhaust.device.
that. ensures. constant. and. effi-
cient. extraction. of. products. gen-
FLOW.
REGOLATORE
REGULATOR
DI PORTATA
erated.by.combustion;
–. have.a.diameter.that.is.not.inferior.
to.that.of.the.boiler.union;
–. to. be. properly. sized. to. meet. the.
flue.gas.draught/exhaust.require-
ments.necessary.for.regular.oper-
ation.of.the.product.(EN13384-1);
-. a. specific. condensate. outlet. sys-
tem. must. be. installed. at. the. bot-
tom.of.the.flue;
-. rigid. pipes. must. be. used. for. the.
connection. to. the. flue,. resistant.
to. high. temperatures,. condensa-
tion,. mechanical. stress,. sealed.
and.insulated..Use.material.suited.
to. the. purpose,. such. as. stainless.
steel.
Our. boilers. are. the.B
. type. and. do.
23
not.need.any.particular.connections.
other. than. the. one. to. the. flue. as.
described.above.
2.4
FUEL ADDUCTION
(fig. 7 - fig. 7/a)
The.fuel.can.be.fed.into.the.thermal.
group. sideways,. the. ducts. must. be.
Fig..5
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