Tech Controllers ST-976 User Manual page 32

Example:
Room temperature difference
Change in the set temp
Pre‐set valve temp.
Pre‐set room regulator temp.
Case 1:
If the room temperature rises to 23.5
such an extent as to have 39
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:
Opening direction
BUILT‐IN
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
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.
32
SETTINGS:
º
C as the pre‐set value (temp. reduction of 1
VALVE
0,5°C
1°C
40°C
23°C
º º
C ( 0.5 C above the pre‐set room temp.), the valve closes to
Left
Right
OFF
ON
Maximum temperature
º
C).
∙
10
.