Tech Controllers ST-976 - Valve Settings; Buffer Parameters

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4.4.6 Bufferparameters
FITTER'SMENU
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BUFFER
PARAMETERS
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Buffer
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Pre‐settemperaturetop
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Pre‐settemperaturebottom
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DHWfunction
Theseparametersareusedtoadjustthecontrolleroperationinthecaseofheatingsystemwithabuffer.
Buffer
Oncebufferfunctionhasbeenactivatedinthecontrollermenu(byselectingON),CHpumpservesaspump
ofthebufferinwhichtwosensorsareinstalled:upper(C1)andlower(C2).Thepumpremainsactiveuntilthe
pre‐setparametersarereached.Whenthetemperaturedropsbelowthepre‐setbuffertoptemperature,the
pumpisactivatedagain.Whenthebufferisactive,activatingthefire‐upfunctionresultsinbuffer
temperatureadjustment.
SelectingONoptionwillresultinchangingtheCHsensorforthevalve‐additionalsensor 1 willservethis
function.
Pre‐settemperaturetop
Thisfunctionenablestheusertodefinethepre‐settemperatureofbuffertop(C1sensorshouldbeplacedin
theupperpartofthetank).Itisthedesiredtemperatureofthebuffer.
Pre‐settemperaturebottom
Thisfunctionenablestheusertodefinethepre‐settemperatureofbufferbottom(C2sensorshouldbeplaced
inthelowerpartofthetank).
DHWfunction
Inthecaseofheatingsystemswithabuffer,thisfunctionisusedtoselectthetypeofDHWtankconnection
‐fromCHboiler–selectifDHWtankisconnecteddirectlytotheCHboiler(itsowncirculationseparatefrom
thebuffer).Whenthisoptionisselected,DHWpumpusesthereadingsfromtheCHsensor.
‐frombuffer–selectifDHWtankisbuiltinthebufferordirectlyconnectedtoit.Whenthisoptionisselected,
DHWpumpusesthereadingsfromthebuffersensor.
4.4.7 Valvesettings
FITTER'S
MENU
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VALVE
SETTINGS
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Built‐invalve
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Valve1
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Valve2
ST‐976controllerhasabuilt‐inmodulecontrollingthemixingvalve.Itispossibletoconnecttwoadditional
modulesforcontrollingvalves(e.g.ST‐431N).Thereisarangeofparametersallowingtheusertoadjustthe
valveoperationtotheindividualneeds.Afteragivenvalveisactivated,thedisplayshowsanadditionalmenu
offeringarangeofvalveparameterstobeconfigured.