Advanced Fan Coil Control with KNX eTR 102 FC of Elsner

Advanced Fan Coil Control with KNX eTR 102 FC of Elsner
A Compact All-in-One Solution for Intelligent Climate Control over KNX
In building automation, climate control using fan coil units often requires a complex integration of multiple components: temperature controllers, fan actuators, logic modules, sensors, and user interfaces. This results in intricate wiring, longer setup times, and more demanding maintenance.
The answer to these challenges is the KNX eTR 102 FC from Elsner Elektronik – an all-in-one room temperature controller specifically designed for the complete management of fan coil systems within KNX networks.
All-in-One: Regulation, Control, Interface
The KNX eTR 102 FC brings together multiple features in one compact, modern device:
Built-in temperature sensor, with the option to calculate a mixed temperature value (with configurable contribution from an external KNX sensor)
Advanced PI control for heating and cooling, single-stage or two-stage, with parameters specifically optimized for fan coil systems
Three-speed fan control, selectable in manual or automatic mode
Capacitive touch interface with LED-backlit control areas, fully configurable via ETS
All this comes in a sleek, shallow-profile housing with a glass front panel, and from 2025, a bottom-mounted lock screw to prevent unauthorized removal – ideal for commercial settings.
Flexible Operating Modes
The controller supports all standard HVAC comfort modes for advanced climate management:
Comfort (presence)
Standby (short-term absence)
Eco (night mode or long-term absence)
Building protection (frost/heat protection)
Each mode is individually configurable with dedicated setpoints or as a deviation from a base comfort setpoint. Switching between heating and cooling can be automatic or manual, using a switching object (Umschaltobjekt) – ideal for seasonal or dynamic applications.
Integrated Logic and Automation
Thanks to 2 AND and 2 OR logic gates built into the device, complex automation scenarios can be created directly within the controller – such as disabling cooling when a window is open or locking the fan coil if a temperature threshold is exceeded.
Each logic gate has 4 inputs and outputs that can be configured as 1-bit or 2x8-bit, allowing a high level of customization without the need for external logic modules.
Other advanced features include:
Configurable temperature thresholds with hysteresis
Behavior settings for reset or power failure
Manual override with optional setpoint retention
Real-time control and monitoring via the KNX bus
Intelligent Fan Control
One of the standout features of the KNX eTR 102 FC is its native fan coil control capability:
Manual or automatic operation of the three fan speeds (0–3)
Automatic mode driven by the control output value (Reglerstellgröße):
0% = Fan off
1–33% = Stage 1
34–66% = Stage 2
67–100% = Stage 3
Ability to define whether higher speeds include lower speeds (e.g., Stage 2 also activates Stage 1)
Support for 4/6-way valves, with combined heating/cooling control on a single output
These features make the eTR 102 FC highly suitable for sophisticated installations requiring precise climate control and optimized energy consumption.
Features for the KNX Professional
Configuration is done via ETS 5 or higher. The device offers a wide range of communication objects, including:
Measured temperature values (internal, external, or mixed)
Min/max temperature tracking
Mode control objects (comfort, standby, eco, protection)
Control outputs (0–100% scaling or 1-bit switching)
Customizable LEDs as status indicators or ambient design elements
Logical inputs to trigger scenarios or automation
Ideal Applications
The KNX eTR 102 FC is perfect for:
Hotels, thanks to its elegant design and simple interface
High-end residential buildings, where comfort and automation merge
Offices and multipurpose spaces requiring custom logic and precise control
Renovation projects, where compact, KNX-integrated HVAC control is needed without additional HVAC modules
Conclusion
The KNX eTR 102 FC marks a new generation of fan coil control within KNX systems. With its intelligent regulation, integrated logic, and modern design, it offers a highly efficient, elegant, and easy-to-integrate solution for climate control in any environment.
You can find it at MT Distribuzione, your trusted partner for innovative building automation and intelligent comfort control solutions.
The MT Distribuzione Srl Team
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