Mixer Circuit Control

The “mixer circuit control” app is an external temperature heating control loop. The “mixer circuit control” is used to configure and control 3-way heating mixer valves.

These functions are located under “all apps” – “mixer circuit control”.

Operation

Click on the element “add mixer control” to create a new mixer circuit controller. The next step is to give your mixer circuit control a name, and then you can continue with the configuration.

The operator panel displays a schematic of the control. This diagram shows you whether the pump is on (screw in the pump is green and rotates) or off. Displayed adjacently is the current temperature of the feed line and to the right the current position of the mixer valve and whether it is open or closed.

All relevant values pertaining to your mixer circuit control are displayed below this.

If your mixer valve is unreferenced, i.e. the current position of the valve is unknown, then the button “execute reference” is displayed. Clicking on it closes the valve completely; hence the current position is known. The mixer circuit control must be fully configured before a reference can be executed.

Heating Curve

The heating curve allows you to adjust the desired temperature of the feed line as a function of the outside temperature.

There are pre-defined curves you can select from using “select curve type”. If there is no pre-defined curve that entirely suits your needs, then you can edit the pre-defined curves by clicking on “edit”. The selection then jumps to “user-defined”. If you wish to save your curve, click on “save”. Saved curves can be deleted using “delete”. When selecting points, you are limited on the one hand by the minimum and maximum feed line temperature, and on the other by the previous and subsequent point. For example, the point at 10 °C outside temperature cannot have a lower feed line temperature than the point at 15°C and a higher temperature than the point at 5°C.

If the outside temperature reaches a value outside of the curve, then the curve is continued horizontally. This means if the curve were to end on the left-hand side at an outside temperature of +20°C with a corresponding feed line temperature of +22°C, then the feed line temperature for outside temperatures higher than +20°C will remain +22°C.

To be able to process outside temperatures higher than +20°C, the cooling operation must be activated under “all apps” – “settings” – “room climate”. Warning! Cooling operation may only be activated if the heating is really able to cool, since in cooling mode, the mixer outputs are switched exactly the opposite way.

Feed Line Temperature Limitation

You can define your minimum and maximum feed line temperatures here.

Hier können Sie Ihre minimale und maximale Vorlauftemperatur einstellen.

Rücklauftemperatur Begrenzung

Über diese Einstellung können Sie die maximale Temperatur, die im Rücklauf vorhanden sein darf, regulieren. Wird die eingestellte Temperatur überschritten, wird das Ventil geschlossen bis die Temperatur wieder unter dem vorgegebenen Wert liegt.

Mixer Parameters

Enter the runtime for the mixer valve in seconds according to the manufacturer in “manufacturer mixer valve runtime [s]”. If the value you entered was correct, then you must now click on the button “execute reference run”. Please note that you must have previously correctly set the inputs and outputs.

The field “overrun time” lets you how much longer in percent the mixer output remains switched on when completely open or closed. This guarantees that the mixer is subsequently really completely open or closed.

Since a mixer valve normally requires longer to close than to open, you can use the “multiplier mixer closed” to define how much longer the valve needs to close than open.

Calibration Run

Since there is always a certain error when opening and closing the valve, a calibration run must be run daily. All you have to do is set the desired time for this to occur and the rest is done automatically.

Inputs

Feed line actual temperature
Select the input here that measures the actual temperature of the feed line.

Outside temperature
Select here the input used to measure the outside temperature. The standard setting is located in “system” – “house status” – “outside temperature”.

Release
Select the main switch for the mixer control. This input is used to activate or deactivate the entire control.

Outputs

Valve Type
The used valve type is chosen here. The options are analog with "0-10V signal" and digital "open/close signal".

Valve
(With valve type "0-10V signal")
Select the analog output, which will be used for the valve control.

Mixer open
(With valve type "Auf/Zu signal")
Select here the output used to open the mixer valve.

Mixer closed
(With valve type "Auf/Zu signal")
Select here the output used to close the mixer valve.

Pump
Select the output used to connect the mixer pump.

Fault
Select an output to be switched if there is a fault.

Pumpe deaktivieren

In diesem Abschnitt können Sie die automatische Abschaltung der Pumpe einstellen, wenn von Ihnen festgelegte Temperaturen über- oder unterschritten werden.

Absenkbetrieb

Hier kann der Absenkbetrieb konfiguriert werden. Bei aktiviertem Absenkbetrieb wird die Vorlauftemperatur der Heizkurve um den eingestellten oder verknüpften Wert korrigiert. Im Heizbetrieb wird der Wert subtrahiert im Kühlbetrieb addiert. Der Absenkbetrieb kann zum Beispiel mit dem Hausstatus verknüpft werden, dadurch wird die Heizkurve automatisch an die Hausbelegung angepasst.

Extended Configuration

The extended configuration allows you to configure all the components of your mixer control extra. Simply click on “edit”. Exercise caution, particularly when adjusting the controller parameters.

Below this, you can adjust the sample time and minimum error.

Sample time
This is the time period when a new position of the valve is calculated (standard 10s).

Minimum error
The position of the valve is only adjusted if there is a difference between desired and actual temperature of the feed line. If the difference (error) is larger than this value, then the position of the valve is changed.

Activate notification
If you wish to receive a notification of a fault condition, then activate this option.