Sime RMG MK.II Serie Manual De Instalación página 44

order. to. eliminate. any. foreign. bodies.
that.might.be.detrimental.to.the.opera-
ting.efficiency.of.the.appliance..
The.unit.must.be.connected.up.with.rigid.
pipe. fittings. which. will. not. subject. it. to.
stress.of.any.kind..
The. connections. should. be. easy. to.
disconnect.using.pipe.unions.with.orien-
table. connections.. You. are. recommen-
ded. to. install. suitable. shutoff. valves. on.
the.system.flow.and.return.pipes..
In order to achieve a good water distri-
bution inside the cast-iron body, the
system flow and return pipes should be
connected to the same side of the boiler..
The boiler comes supplied standard
with the attachments on the right-hand
side, with the possibility of them being
transferred to the left-hand side.
In that case, move the water distributor,
located on the return header, and the
thermostat bulbs located in the shea-
the, to the same side.
The. thermal. jump. between. the. system.
flow.and.return.pipes.should.not.exceed.
20°C..For.this.purpose,.it.is.advisable.to.
install.a.mixer.valve.with.corresponding.
anti-condensation.pump.
CAUTION: The system circulation pump
or pumps must go into action at the time
of boiler ignition. For this purpose, you
are recommended to use an automatic
system of precedence.
The.gas.connection.must.be.made.using.
seamless.steel.pipe.(Mannesmann.type),.
galvanized.and.with.threaded.joints.pro-
vided.with.gaskets,.excluding.three-pie-
ce.connections,.except.for.initial.and.end.
connections.. Where. the. piping. has. to.
pass.through.walls,.a.suitable.insulating.
sleeve.must.be.provided..
When. sizing. gas. piping,. from. the. meter.
to. the. boiler,. take. into. account. both. the.
44
volume.flow.rates.(consumption).in.m
and. the. relative. density. of. the. gas. in.
question..
The. sections. of. the. piping. making. up.
the. system. must. be. such. as. to. guaran-
tee. a. supply. of. gas. sufficient. to. cover.
the.maximum.demand,.limiting.pressure.
loss. between. the. gas. meter. and. any.
apparatus. being. used. to. not. greater.
than:
–. 1.0. mbar. for. family. II. gases. (natural.
gas);
–. 2.0.mbar.for.family.III.gases.(butane.or.
propane).
An. adhesive. data. plate. is. sticked. insi-
de. the. front. panel;. it. contains. all. the.
technical. data. identifying. the. boiler. and.
the. type. of. gas. for. which. the. boiler. is.
arranged.
2.3 CHARACTERISTICS
OF FEEDWATER
It. is. absolutely. essential. that. the. water.
used. for. the. central. heating. system.
should.be.treated.in.the.following.cases:
–. Very.extensive.systems.(with.high.con-
tents.of.feedwater).
–. Frequent. addition. of. makeup. water.
into.the.system.
–. Should. it. be. necessary. to. empty. the.
system.either.partially.or.totally.
2.3.1 Filter on the gas pipe
The.gas.valve.is.supplied.ex.factory.with.
an. inlet. filter,. which,. however,. is. not.
adequate. to. entrap. all. the. impurities. in.
the.gas.or.in.gas.main.pipes.
To. prevent. malfunctioning. of. the. valve,.
or. in. certain. cases. even. to. cut. out. the.
safety. device. with. which. the. valve. is.
equipped,. install. an. adequate. filter. on.
the.gas.pipe.
2.4 SYSTEM FILLING
Filling.must.be.done.slowly.so.as.to.allow.
any.air.bubbles.to.be.bled.off.through.the.
air.vents.provided.on.the.heating.system..
The. pressure. of. cold. charging. of. the.
system,. and. the. pressure. of. pre-pres-
surization.of.the.expansion.vessel,.must.
correspond,. or. in. any. case. must. not. be.
less.than,.the.height.of.the.static.column.
of.the.system.(e.g.,.for.a.static.column.of.
5. m,. the. pre-pressurization. pressure. of.
the. expansion. vessel. and. the. charging.
pressure. must. correspond. to. at. least.
0.5.bar).
2.5 CONNECTING UP FLUE (fig. 4)
The.flue.for.the.atmospherical.expulsion.
of.the.combustion.products.from.natural.
Fig..3/a
draught. appliances. must. meet. the. fol-
lowing.requirements:
–. Be. gas-tight. to. the. combustion. pro-
3
/h. ducts,.waterproof.and.thermally.insu-
lated.
–. Be.built.of.materials.suitable.for.keep.
resisting.to.normal.mechanical.stres-
ses,.heat,.and.the.action.of.combustion.
products.and.their.possible.condensa-
tes.
–. Follow.a.vertical.path.and.not.present.
any. throttling. throughout. its. entire.
length.
–. Be. adequately. insulated. to. prevent.
phenomena. of. condensation. or. smo-
kes. cooling,. in. particular. if. located.
outside. the. building. or. in. unheated.
ambiences.
–. Be. set. at. an. adequate. distance. from.
combustible. or. easily. inflammable.
material. by. means. of. an. air. gap. or.
suitable.insulating.material.
–. Have. beneath. the. mouth. of. the. first.
smoke. duct. a. chamber. for. collecting.
solid.material.and.any.condensate;.the.
height.of.the.chamber.must.be.at.least.
500.mm..
. Access. to. the. chamber. must. be. gua-
ranteed.by.means.of.an.opening.provi-
ded.with.an.air-tight.metal.door.
–. Have. a. circular,. square,. or. rectan-
gular. internal. cross. section;. in. the.
case. of. square. or. rectangular. sec-
tions,. the. corners. must. be. rounded.
off. with. a. radius. of. not. less. than. 20.
mm.. However,. hydraulically. equiva-
lent.cross.sections.are.allowed.
–. Be. equipped. with. a. chimney-pot. at.
the.top,.which.must.be.outside.the.so-
called.back-flow.zone,.so.as.to.prevent.
the.formation.of.back-flow,.which.pre-
vents.free.discharge.of.the.products.of.
combustion.into.the.atmosphere..
. Therefore,. conform. to. the. minimum.
heights.indicated.in.fig..4.
–. Be. devoid. of. mechanical. means. of.
suction.located.at.the.top.of.the.pipe.
–. No.overpressure.should.be.present.in.
a.chimney.that.passes.within.or.close.
up.to.inhabited.rooms.