Thermostat for Valve Drive Controller (VDC)

CONTROLLER

Settings

General

Mandatory fields

Optional fields

Title

Hide from mobile app and all other remote services (checkbox)

Thermostat title

Dewpoint alarm title

Voice control (checkbox)

Step for shifting (if not set, then 0.5 K)

Setpoint/Shifting minimum value

Setpoint/Shifting maximum value

Use custom modes (checkbox)

Mode name
Mode value
Mode status

Objects
Mandatory fields	Description	Optional fields	Description
Current temperature	Currently measured temperature for the widget (input) DPT_Value_Temp (9.001)	Operation mode input	Mode set by widget DPT_1-byte unsigned int (05.010)
Current setpoint output	Output value changed by the widget DPT_Value_Temp (9.001)	Thermostat status, alert	1-byte status object interpreting values: Bit 0: Comfort Bit 1: ECO Bit 2: Night mode Bit 3: Frost/heat protection Bit 4: Dewpoint alarm Bit 5: Heating/cooling DPT_1-byte unsigned int (05.010)
Current setpoint input (Absolute mode)/Basic setpoint (Relative mode)	Input value changed by external device (feedback field) DPT_Value_Temp (9.001)	Thermostat HVAC status	Feedback object; values correspond to the operation mode input. DPT_1-byte unsigned int (05.010)
Preset setpoint shifting (Relative mode)	Predefined shift value DPT_Value_Temp (9.001)	Is Active	Currently not supported. DPT_1-bit (01.0)
Current setpoint shifting (Relative mode)	Current shift value DPT_Value_Temp (9.001)	Dewpoint alarm	Feedback object (1-bit) DPT_1-bit (01.0)
		Frost alarm	Feedback object (1-bit) DPT_1-bit (01.0)
		Heating/Cooling changeover	Control object (1-bit) DPT_1-bit (01.0)

Touch widget

Thermostat VDC

MOBILE APPLICATION

App widget

Control screens


With objects for Absolute value and Operation modes	With objects for Relative value and Operation modes

CONTROL SCREEN ELEMENTS

Current temperature

Displayed at the top of the screen.
The value is read directly from the KNX datapoint.
Units are shown in either °C or F, depending on system settings.

Status icon – Heating/Cooling

A dynamic icon indicates the current operating state.
The icon changes based on the relationship between the current temperature and the setpoint, and the selected mode:

Condition	Mode	Icon
Current temperature > Setpoint	Cooling
Current temperature > Setpoint	Heating
Current temperature < Setpoint	Cooling
Current temperature < Setpoint	Heating

Setpoint temperature

Displays the current target temperature.
The value is read from the datapoint.
Shown in °C or °F.

Mode button

Displays the currently active mode (e.g., Comfort, Eco, Night).
Tap the mode icon to open the mode selection screen.
Select the desired mode and tap Set to confirm.

Cooling/Heating toggle

A simple toggle button that switches between cooling and heating modes.

Custom Modes

The VDC thermostat allows you to configure up to six custom modes, which extend the functionality beyond the standard modes like Comfort, Standby, or Sleep. These custom modes are useful for tailoring the thermostat’s behavior to specific user needs or scenarios.

Each custom mode must include:

A unique name – used to identify the mode in the app.
A mode value – the value sent to the system when the mode is activated.
A mode status – a status value that is used for feedback or logic in the system.

Adding and Managing Modes

To add a new mode, click the Add another mode button.
Fill in the Mode name, Mode value, and Mode status fields.
To remove a mode, click Remove this mode next to the specific mode you want to delete.

Using custom modes is optional – they are enabled by checking the Use custom modes box in the thermostat General settings.