Heati
ngWaterQuality
Hea
tingWaterQuality
Boththecompositionandthequality
ofthesystemwaterdirectlyaffectthe
performanceofthecompletesystem
andlifecycleoftheboiler.
Forfirstfillingandsubsequentsupply
tothesystem,youcangenerallyuse
tapwaterofapHvalueof7-8unless
itisverycorrosive(chloridecontent
>150mg/L)orveryhard(>14°dH;
hardnessrangeIV).Youcanobtain
drinkingwateranalysesfromthe
competentwatersupplyworks.
Ifspecificsystemvolumeishigher
than20litres/kWheatingpower
(ifanyheatingwaterbuffertank
isincorporated,forinstance),the
maximumadmissiblelimefeedby
thefillingandsupplywatershould
bedeterminedbythecalculation
procedureindicatedinVDIDirective
2035.Ifnecessary,thefillingwater
shouldbesoftened.Donotuseany
chemicalcorrosionprotectionagents.
ForAustria,ÖNORMH5195-1is
alsoapplicable.
ForSwitzerland,thedirective
SWKIBT102-01applies.
Unknownwaterqualityand
substitutionsystems
Theheatingwateroftencontains
substancesandadditiveswhich
affectfunctionandlifecycleofthe
Thermounit.
Thereforeyoushouldeither:
he
atuptheoldsystemand
completelydischargeitpriorto
replacingthesystemor
carefullyflushtheheatingsystem
priortoreplacingthesystem.
Systemflushwillbemostefficient
directlypriortofirstheatingup.
Criterion PermissibleValue EffectuponDeviation
pHvalue 7-8 Riskofcorrosionforboilercomponentsandheatingsystem
Hardnessdegrees <14dH/<25fH -increasedlimedepositing
-lowlifecycleofboiler
Chloridecontent <150mg/l Corrosionofalloymaterials
4
Flo
orheating
Youcandirectlyconnectfloorheating
whenpipesaresealedagainst
oxygen.
Youusuallyhavetobuildina
temperaturecontrollerforthefloor
heatingsystemtopreventthepipes/
floorcoveringsfromoverheating.
Ifyoudonotknowthemodeloffloor
heating(whensystemsarereplaced,
forinstance)youhavetoinstall
aseparatingdevicebetweenthe
systemsofboilerandfloorheating
usingaheatexchanger(option).
e
n