Tech Controllers ST-976 - Page 32

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32
Example:
SETTINGS:
Roomtemperaturedifference 0,5°C
Changeinthesettemp 1°C
Pre‐setvalvetemp. 40°C
Pre‐setroomregulatortemp. 23°C
Case1:
Iftheroomtemperaturerisesto23.5ºC(0.5ºCabovethepre‐setroomtemp.),thevalveclosesto
suchanextentastohave39ºCasthepre‐setvalue(temp.reductionof1ºC).
Case2:
If the room temperature drops to 22ºC (1ºC below the pre-set room temp.), the valve
opens to such an extent as to have 42ºC as a pre-set value (temp. increase of 2ºC).
Proportionalitycoefficient
Proportionalitycoefficientisusedfordefiningvalvestroke.Theclosertothepre‐settemperature,thesmaller
thestroke.Ifthecoefficientvalueishigh,thevalvetakeslesstimetoopenbutatthesametimetheopening
degreeislessaccurate.Thefollowingformulaisusedtocalculatethepercentofasingleopening:
   󰇛  󰇜 ∙

10
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Openingdirection
BUILT‐IN
VALVE

OPENING
DIRECTION



Left

Right
If,afterconnectingthevalvetothecontroller,itturnsoutthatitisconnectedtheotherwayround,thenthe
powersupplycablesdonothavetobeswitched.Instead,itisenoughtochangetheopeningdirectioninthis
parameter:LEFTorRIGHT.
CHsensorselection
Thisoptions enablestheuser tochoosethe sensorwhich willserveasCHsensor.ItmaybeCHsensoror
additionalsensor1.
NOTE
CHsensorisselectedbydefault,butitwillchangeintoadditionalsensor1oncebufferhasbeenactivated.
CHboilerprotection
BUILT‐IN
VALVE 

CHBOILER
PROTECTION



OFF

ON

Maximumtemperature
The protection against too high CH temperature serves to prevent the hazardous growth in CH boiler
temperature.Theusersetsthemaximumacceptablereturntemperature.
Intheeventofahazardousgrowthintemperature,thevalvebeginstoopentohouseheatingsysteminorder
tocooltheCHboilerdown.Thisfunctionisenabledpermanently.