Tech Controllers ST-976 - Page 40

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 Househeating
 Withoutroomregulatorandbuffer(Fire‐upfunction):
Thisoptionshouldnotbeselectedbecauseinsuchacaseitwillremaininactive.
 RoomregulatorON,withoutbuffer(Fire‐upfunction+Roomregulator):
Whenthefire‐upfunctionisselected,theroomregulatorcontrolstheCHboileroperation.Whenthepre‐set
roomtemperatureisreached,theCHboilerisdisabled.Itwillbeenabledagainwhentheroomtemperature
dropsbythepre‐sethysteresisvalue.Whenthisfunctionisinactive,theCHboileroperatesaccordingtopre‐
configuredoperationparameters.
 BufferON(Fire‐upfunction+Buffer+DHWfunctionfromCHboilerorbuffer):
Whenthefire‐upfunctionisselected,thebuffercontrolstheCHboileroperation.Whenthepre‐setbuffer
temperature is reached,the CH boiler is disabled. When this function is inactive, the CH boiler operates
accordingtopre‐configuredoperationparameters(dampingandfire‐upbasedonCHsensor).DHWfunction
servesnoroleinthiscase,butitshouldbeselecteddependingonthetypeofheatinginstallation.
 Watertankpriority
 Withoutroomregulatorandbuffer(Fire‐upfunction):
Thisoptionshouldnotbeselectedbecauseinsuchacaseitwillremaininactive.
 RoomregulatorON,withoutbuffer(Fire‐upfunction+Roomregulator):
TheCHboilerisdampedwhenthepre‐setDHWtemperatureisreachedandtheroomregulatorinformsthat
thepre‐setroomtemperaturehasbeenreached.EmergencyCHboilerdampingwillbecarriedoutwhenthe
pre‐setCHtemperatureisexceededby5°C.
 BufferON(Fire‐upfunction+Buffer+DHWfunctionfrombuffer):
Whenthepre‐settemperatureofbufferbottomisreached(C2sensor), CH boiler damping will start
regardless of CH and DHW temperature. The main screen displays ‘Buffer pre‐set temperature reached’
belowFire‐up/Dampingtouchbuttons.Emergencydampingwillalsostartwhenthepre‐setCHtemperature
isexceededby5°C.
 BufferON(Fire‐upfunction+Buffer+DHWfunctionfromfromCHboiler):
Whenthepre‐settemperatureofbufferbottomisreached(C2sensor)aswellasthepre‐setwatertank
temperatureisreached,CHboilerdampingwillstartregardlessofCHtemperature.Themainscreendisplays
‘Bufferpre‐settemperaturereachedandPre‐setDHWtemperaturereached’belowFire‐up/Dampingtouch
buttons.Emergencydampingwillalsostartwhenthepre‐setCHtemperatureisexceededby5°C.
 Parallelpumps
 Withoutroomregulatorandbuffer(Fire‐upfunction):
Thisoptionshouldnotbeselectedbecauseinsuchacaseitwillremaininactive.
 RoomregulatorON,withoutbuffer(Fire‐upfunction+Roomregulator):
TheCHboilerisdampedwhenthepre‐setDHWtemperatureisreachedandtheroomregulatorinformsthat
thepre‐setroomtemperaturehasbeenreached.EmergencyCHboilerdampingwillbecarriedoutwhenthe
pre‐setCHtemperatureisexceededby5°C.
 BufferON(Fire‐upfunction+Buffer+DHWfunctionfrombuffer):
Whenthepre‐settemperatureofbufferbottomisreached(C2sensor), CH boiler damping will start
regardless of CH and DHW temperature. The main screen displays ‘Buffer pre‐set temperature reached’
belowFire‐up/Dampingtouchbuttons.Emergencydampingwillalsostartwhenthepre‐setCHtemperature
isexceededby5°C.
 BufferON(Fire‐upfunction+Buffer+DHWfunctionfromCHboiler):
Whenthepre‐settemperatureofbufferbottomisreached(C2sensor)aswellasthepre‐setwatertank
temperatureisreached,CHboilerdampingwillstartregardlessofCHtemperature.Themainscreendisplays
‘Bufferpre‐settemperaturereachedandPre‐setDHWtemperaturereached’belowFire‐up/Dampingtouch
buttons.Emergencydampingwillalsostartwhenthepre‐setCHtemperatureisexceededby5°C.
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