| Overview
IdroCONTROL is a Fan Coil Unit (FCU) controller for individual zone control in commercial building applications. It supports 2-pipe and 4-pipe FCU configurations. The controller provides inputs and outputs for controlling water valves, fan speeds, auxiliary heating, and fresh-air dampers. It provides universal inputs, analog outputs, relay outputs, thermal valve outputs, and a 2-wire PoR sensor bus for field-device connectivity.
IdroCONTROL supports BACnet IP over Ethernet, BACnet MS/TP over RS-485, secure mesh networking (IEEE 802.15.4-compliant), and Bluetooth Low Energy (BLE) 4.1 for commissioning and communication.
| Hardware Overview
The front of IdroCONTROL provides the display and navigation interface for viewing zone information and accessing controller settings.
| Front interface
| No. | Component | Description |
|---|---|---|
| 1 | TFT display | 1.77-inch, 240 × 128-pixel RGB TFT display for displaying zone information, operating status, and controller settings. |
| 2 | Navigation buttons | Four buttons for navigating the controller interface: Up, Down, Left, and Right. |
The navigation buttons are used to move through the available screens and settings on the TFT display.
| Internal interface
Remove the front cover to access the internal terminal connections and service interfaces.
The internal terminals provide connections for AC power, FCU control outputs, analog outputs, universal inputs, sensor connectivity, and wired communication.
| No. | Terminal / Interface | No. of Ports | Function / Input Type | Technical specification |
|---|---|---|---|---|
| 3 | N, L | 1 | AC power supply | 100–240 VAC, 50/60 Hz |
| 4 | N, EH | 1 | Electric heater control | 250 VAC, 10 A relay; PWM control |
| 5 | N, L, S1, S2, S3 | 1 | Motor / fan speed control | 3 relay outputs, 250 VAC, 3 A; S1 = Speed 1, S2 = Speed 2, S3 = Speed 3 |
| 6 | TO1, GND / TO2, GND | 2 | Thermal valve control | 24 VDC, maximum 300 mA output |
| 7 | AO1–AO4, GND | 4 | Analog outputs | 0–10 VDC; dedicated GND for each output |
| 8 | 24V, 24V | 4 | DC power output | 24 VDC, maximum 300 mA |
| 9 | TH1, GND | 1 | Dedicated thermistor input | 1 kΩ–100 kΩ : - 1 kΩ–5 kΩ: ±5% tolerance - 5 kΩ–75 kΩ: ±2% tolerance - 75 kΩ–100 kΩ: ±5% tolerance |
| UI2–UI6, GND | 5 | Universal inputs | Configurable as thermistor or 0–10 VDC analog inputs. Thermistor :1 kΩ–100 kΩ | |
| 10 | PoR (+, −) | 1 | Sensor communication | 2-wire PoR connection for power and communication with compatible sensors and devices |
| 11 | RS-485 (A−, B+, G) | 1 | BMS / wired communication | BACnet MS/TP or Modbus : BACnet: 9600, 19200, 38400, 76800, 115200 baud Modbus: 9600, 19200, 38400, 115200 baud |
| 12 | ETH1, ETH2 | 2 | Ethernet communication | 10/100 Mbps; automatic fail-safe bypass when powered off |
| No. | Component / Interface | No. of Ports | Function / Input Type | Technical specification |
|---|---|---|---|---|
| 13 | External RF Antenna Connector | 1 | RF Communication | Provision for connecting an external antenna for RF communication. |
| 14 | Service Interface buttons | - | MCU's Reset and Firmware Update | Provides DFU and Reset controls for the Main MCU and Ethernet MCU. The two MCUs are located on the same controller board and manage separate functional domains while operating in synchronization |
| 15 | USB Type-C Port | 1 | Device Firmware Update | USB Type-C interface provided for Device Firmware Update (DFU) / firmware programming. |
| Service interface
The service interfaces are intended for firmware update and controller service operations.
| Interface | Associated MCU | Function |
|---|---|---|
| MCU BST/DFU | Main MCU | Used for firmware update of the Main MCU |
| MCU RST | Main MCU | Resets the Main MCU |
| ETH BST/DFU | Ethernet MCU | Used for firmware update of the Ethernet MCU |
| ETH RST | Ethernet MCU | Resets the Ethernet MCU |
| Wiring
⚠️ WARNING: Disconnect the power supply before installing, wiring, or servicing IdroCONTROL.
2-pipe FCU wiring :
4-pipe FCU wiring :
Note: Wiring connections may vary depending on the FCU architecture, application, and system configuration.
| Jumper Configuration
IdroCONTROL provides an End-of-Line (EOL) termination jumper for the RS-485 communication bus. The jumper enables the 120 Ω termination resistance required for RS-485 bus termination.
The End-of-Line jumper is located at the position marked EOL, near the RS-485 interface.
The EOL jumper is installed by default on the IdroCONTROL
Important: Enable RS-485 termination only on devices located at the physical ends of the RS-485 bus.
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