37
4.1
BOILER ROOM
Check.that.the.room.has.the.requirements.
and.features.in.accordance.to.the.rules.in.
force.. Furthermore,. the. room. should. be.
aired,. in. order. to. have. a. regular. combu-
stion..Therefore.it.is.necessary.to.practice.
some. openings. in. the. walls. of. the. room,.
which. correspond. to. the. following. requi-
rements:
–. They. should. have. a. free. section. of. at.
least. 6. cm
2
. for. each. 1,163. kW. (1000.
kcal/h).. The. minimum. opening. section.
shouldn’t.be.smaller.than.100.cm
2
..The.
section.can.also.be.calculated,.using.the.
following.ratio:.
. where.“S”.is.expressed.in.cm
2
..
. “Q”.is.expressed.in.kcal/h.
–. The. opening. should. be. situated. on. the.
lower.part.of.an.outer.wall,.preferably.on.
the. opposite. of. the. one. for. the. combu-
stion.gas.discharge..
4.1.1
Positioning in the power station
(fig. 4)
The.boiler.must.be.installed.on.a.non-com-
bustion.base..
Once.the.boiler.has.been.installed,.it.must.
be.horizontal.and.stable,.in.order.to.reduce.
any.vibrations.and.noise.
Always.leave.free.space.behind.the.boiler,.
so.as.to.allow.opening.and.maintenance.on.
the.fan.
CAUTION: The minimum distances indi-
cated in the figure are bounding and only
refer to models with power exceeding 35
kW.
4.2
CONNECTION TO THE FLUE
A. flue. should. correspond. to. the. following.
requirements:.
–. It.should.be.of.waterproof.material.and.
resistant.to.temperature.of.smokes.and.
related.condensations..
–. It. should. be. of. a. sufficient. mechanical.
resistance.and.a.weak.thermal.conduc-
tivity.
–. It.should.be.perfectly.hermetic.in.order.
to.avoid.cooling.of.the.flue.
–. It.should.have.the.most.possible.vertical.
process. and. the. terminal. part. should.
have.a.static.aspirator,.which.assures.an.
efficient. and. constant. discharge. of. the.
combustion.product..
–. In.order.to.avoid.the.wind.creating.a.very.
high.pressure.around.the.chimneypot,.so.
that.it.prevails.on.the.ascensional.force.
of. the. combustion. gas,. it. is. necessary.
that.the.discharge.orifice.hangs.over.at.
least. 0,4. meters. of. whatever. structure.
adjacent.the.chimney.itself.(including.the.
roof.ridge).of.at.least.8.meters..
–. The. flue. shouldn’t. have. a. diameter. in-
ferior.to.the.boiler.connection;.for.flues.
with.square.or.rectangular.sections,.the.
internal. section. should. be. higher. than.
10%. compared. to. the. boiler. connection.
one..
–. The.net.section.of.the.flue.can.be.obtai-
ned.from.the.following.ratio:.
. S. section.resulting.in.cm
2
. K. reduction.coefficient:
–. 0,045.for.wood.
–. 0,030.for.carbon
. P. boiler.capacity.in.kcal/h
. H. height.of.the.chimney.in.meters.me-
asured. from. the. flame. axis. at. the.
exhaust.of.the.chimney.in.the.atmo-
sphere...For.the.dimensioning.of.the.
flue.you.should.consider.the.effecti-
ve.height.of.the.chimney.in.meters,.
measured.from.the.flame.axis.at.the.
top,.diminished.with:
–. 0,50. m. for. each. direction. chan-
ging. of. the. connection. tube.
between.boiler.and.flue;
–. 1,00. m. for. each. horizontal. deve-
lopment.meter.of.the.connection.
itself..
4.3
CONNECTION OF THE PLANT
The. connections. should. be. easily. discon-
nected.by.means.of.pipelines.with.revolving.
joints.. It. is. always. advisable. to. assemble.
suitable.interception.shutters.on.the.piping.
of.the.heating.installation..
CAUTION: It is obligatory to assemble sa-
fety valves on the system not included in
supply.
4.3.1
Filling the system
Before connecting the boiler, it is good
practice to make water circulate inside
the pipes to remove any foreign body that
can compromise the proper operation of
the apparatus.
The. filling. operation. must. be. carried. out.
slowly.to.allow.air.bubbles.to.exit.from.the.
specific. vents. placed. on. the. heating. sy-
stem.
In.closed.circuit.heating.systems,.the.cold.
loading. pressure. of. the. system. and. the.
pre-inflating. pressure. of. the. expansion.
tank. must. correspond,. or. at. least. not. be.
lower.than.the.height.of.the.system.static.
column.(e.g.,.for.a.5.m.static.column,.the.
pre-load.pressure.of.the.tank.and.the.load.
pressure.of.the.system.must.correspond.to.
the.minimum.value.of.0.5.bars,.at.least).
4.3.2
Features of the feed water
The. heating. circuit. supply. water. must. be.
treated.in.compliance.with.Standard.UNI-
COI.8065.
Remember.that.even.small.deposits.of.few.
millimetres. thick. cause. a. considerable.
over-heating. of. the. boiler. walls,. resulting.
in.serious.consequences.
THE. TREATMENT. OF. THE. WATER. USED.
FOR. THE. HEATING. INSTALLATION.
IS. ABSOLUTELY. NECESSARY. IN. THE.
FOLLOWING.CASES:
–. Very. vast. plants. (with. high. water. con-
4 INSTALLATION
. .
. ..Q
. S. =
. .
. 100
. .
. .
P
. S. =. K
. .
. .
√H
600
1300
1000
600
600
1000
Fig..4
