Tech Controllers ST-976 - Thermal Disinfection; Screen Settings

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4.3.9 Thermaldisinfection
ThermaldisinfectioninvolvesDHWanditmaybeactivatedonlyinWatertankprioritymode,Parallelpumps
modeorSummermode.
ItinvolvesraisingthetemperatureofwaterintheDHWcircuittotheminimumof60°C.Currentregulations
requireadjustingtheDHWinstallationtoenablethermaldisinfectioncarriedoutinthetemperatureofatleast
60°C(recommendedtemperature:70°C).Piping,fittingsandtechnologicaldesignoftheDHWsystemneedto
meetthisrequirement.
DHW disinfection aims to eradicate Legionella pneumophila – bacteria which lower the cell‐mediated
immunity.Thebacteriaoftenmultipliesinhotwaterreservoirs (optimumtemperature:35°C),whichoften
happensinwatertanks.
Oncethisfunctionhasbeenactivated,thewaterboilerisheateduntilthepre‐settemperaturereached.The
temperature is maintainedfor thewholedisinfection time (e.g.10minutes). Next,thestandard operation
modeisrestored.Disinfectiontemperatureneedstobereachedwithin60minutesfromitsactivation(default
setting)Otherwise,thefunctionwillbeautomaticallydeactivated.
Anychangesconcerningthisfunctionmaybeintroducedonlyinservicemode.
4.3.10 Screensettings
MAINMENU
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SCREENSETTINGS
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Screenview
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Screenbrightness
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Screenblanking
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Blankingtime
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Softwareupdate
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Screenview
The user may change the main screen view choosing between the panel screen which displays current
parametersofthecontrolleroperationandmanufacturer’sscreen(intendedforauthorisedperson,secured
withacode)whichoffersmoredetails.
Screenbrightness
Thisfunctionisusedtoadjustscreenbrightnesswithintherangeof10to100%.
Screenblanking
Thisfunctionisusedtoadjustblankscreenbrightnesswithintherangeof0do50%.
Blankingtime
Thisfunctionisusedtosetthescreenblankingtime.
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