Valve - Tech Controllers EU-L-7E User Manual

18.

VALVE

EU-L-7E external controller may control an additional valve via valve module (e.g. ST-431N). The devices communicate
using RS communication but it is necessary to register first.
 Registration - Configuring particular parameters of additional valve is possible only after it has been properly
registered by entering the module number (the number may be found at the back of the control module cover or
in Software version submenu).
 Pre-set valve temperature - This function is used to define the pre-set valve temperature measured by the valve
sensor.
 Valve status - This function is used to deactivate the valve temporarily. The valve may be activated again without
the need to register it again.
 Temperature monitoring - This parameter determines the frequency of water temperature measurement
(control) behind the CH valve. If the sensor indicates a change in temperature (deviation from the pre-set value),
the electric valve will open or close by the pre-set stroke, in order to return to the pre-set temperature.
 Opening time - This parameter defines the time needed for the valve actuator to open the valve from 0% to 100%
position. This value should be adjusted to the value given on the actuator rating plate.
 Single stroke - This is the maximum single stroke (opening or closing) that the valve may make during one
temperature sampling. The smaller the single stroke, the more precisely the set temperature can be achieved.
However, it takes longer for the set temperature to be reached.
 Minimum opening- The parameter determines the smallest valve opening. Thanks to this parameter, the valve
may be opened minimally, to maintain the smallest flow.
 Valve type - this option is used to select the valve type:
•
CH - select this option if you want to control CH circulation temperature.
•
FLOOR - select this option if you want to control the floor heating temperature. It protects the underfloor
heating installation against dangerous temperature. If the user selects CH as the valve type and connects it to
the underfloor heating system, the fragile floor installation may be damaged.
 Weather-based control - For the function of weather control to be active, the external sensor mustn't be exposed
to sunlight or influenced by the weather conditions. After it has been installed in an appropriate place, weather
control function needs to be activated in the controller menu.
In order for the valve to operate correctly, the user defines the pre-set temperature (downstream of the valve) for 4
intermediate external temperatures: -20ºC, -10ºC, 0ºC and 10ºC. In order to configure the pre-set temperature value,
use arrows UP and DOWN to select particular external temperature and use arrows UP and DOWN to set desired
temperature value.
Heating curve – it is a curve according to which the pre-set controller temperature is determined, on the basis of
external temperature. In our controller, this curve is constructed on the basis of four pre-set temperatures for
respective values of external temperatures.
The more points constructing the curve, the greater its accuracy, which allows its flexible shaping. In our opinion, four
points seem a very good compromise ensuring decent accuracy and easiness of setting the course of this curve.
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