52
SOLAR ExPANSION vESSELS
The.expansion.vessels.must.have.suitable.dimensions.to.contain.additional.volumes.of.the.mixture.of.water.-.antifreeze.
liquid.generated.from.thermal.expansion.and.vapour,.which.can.be.checked.in.the.collector..The.membranes.of.the.ex-
pansion.vessels.must.be.suitable.for.the.maximum.discharge.pressure.supplied.by.the.safety.valves.(6.bar).and.must.be.
resistant.to.the.mixture.of.water.and.antifreeze.liquid.(heat-transfer.fluid).
Check.that.the.pre-charge.pressure.of.the.expansion.vessel.is.approximately.0.3.bar.lower.than.the.cold.water.filling.
pressure.of.the.system.
THERMOSTATIC MIxING vALvE
The.thermostatic.mixing.valve.must.be.installed.on.the.boiler.outlet.before.the.water.reaches.the.application.(in.order.to.
prevent.scalding),.according.to.that.indicated.in.the.attached.power.supply.diagram.
To.ensure.correct.mixing,.the.hot.water.circuit.and.the.cold.water.circuit.must.have.the.same.pressure.
S3
S2
VASO D’ESPANSIONE
SANITARIO
VALVOLE A SFERA PER
BILANCIAMENTO
CIRCUITO
BOLLITORE
SOLARE
ACQUA
CALDA
SANITARIA
ACQUA
FREDDA
SANITARIA
DALLA RETE
ALL’UTILIZZO
MISCELATA
ALL’UTILIZZO
DALLA RETE
CIRCUITO
SOLARE
MISCELATORE
MISCELATORE
CONNECTING THE ELECTRICAL DEvICES
The.hydraulic.installer.must.install.the.temperature.probes.of.the.control.unit.and.place.the.relative.cables;.on.the.other.
hand,.an.authorised.electrician.must.carry.out.the.connection.to.the.22.v.mains,.the.power.supply.of.the.solar.circula-
tor.and.that.of.the.motorised.valves,.as.set.forth.in.the.standard.in.force.and.in.compliance.with.the.specific.instructions.
supplied.with.the.system.
To.prevent.probe.malfunctions,.we.recommend.the.following:
1....Do.not.place.the.temperature.probe.cables.in.a.pipe.containing.a.220.volt.line;
2....Use.shielded.cables;
3....To.extend.the.probe.cable.of.the.collectors,.use.the.temperature-resistant.cable.(eg,.silicon.cable).
We. recommend. connecting. the. supporting. grille. of. the. solar. collectors. and. the. pipes. to. the. earthing. system. of. the.
house.
MIXING VALVE
MIXING VALVE
TO.THE.
MIxED.USE
DOMESTIC.
HOT.
WATER
DOMESTIC.
COLD.WATER
FROM.THE.
MAINS
BOILER
ROUND.vALvE.FOR.
CIRCUIT.BALANCE
SOLAR.
CIRCUIT
SOLAR.ExPANSION.
.TANK
TO.THE.
MIxED.USE
FROM.THE.MAINS
