Tech Controllers EU-M-8N, User Manual

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4. ACTUATORS
4.1. INFORMATION
Select this option to view all actuators and their parameters: registered or not, battery level and signal strength.
4.2. SETTINGS
This submenu enables the user to configure the operation of the STT-869 thermoelectric actuators. The user may define the
maximum and minimum actuator opening – the level of valve opening and closing will never exceed these values.
SIGMA function enables smooth control of the thermostatic valve. After activating this function, the user may set the
minimum and the maximum level of valve closing.
Moreover, the user configures <Range> parameter, which defines the room temperature at which the valve starts closing
and opening.
Example:
Pre-set zone temperature: 23°C
Minimum opening: 30%
Maximum opening: 90%
Range: 5°C
Hysteresis: 2°C
With the above settings, the vale starts closing when the zone temperature reaches 18°C (pre-set temperature minus Range
value). The minimum opening is achieved when the pre-set zone temperature is reached. Afterwards, the temperature starts
falling. When it drops to 21°C (pre-set temperature minus hysteresis), the valve starts opening. It achieves the maximum
opening when the temperature reaches 18°C.

Protection profile – once this function has been activated, the external controller checks the temperature. If the
pre-set value is exceeded by the number of degrees defined in <Adjustment range> parameter, all the actuators in
the zone will be closed. This function works only when SIGMA function is active.