Tyrrell Products


FCU-HH (BACnet MSTP / Modbus RS485)


Join the Tyrrell Products Loyalty Scheme to unlock exclusive deals.

Get help buying, call 01942 732819

FCU-HH (BACnet MSTP / Modbus RS485)


Explore Pre-loaded Application for 256 Types of Fan Coil Units To minimize time and simplify the commissioning process, the FCU controller is delivered with a built-in application, which supports the most popular types of fan coil units. A dedicated DIP switch allows for adjusting parameters of the application. Additionally, in the BACnet protocol, the application has a built-in function that allows to automatically bind master and slave controllers in the groups. Experience the Freedom of Control Offered by the Sedona Framework FCU-HH is a configurable and freely programmable controller with Modbus RTU/ASCII and BACnet MS/TP protocols onboard. The possibility of creating a tailor-made application with the power and flexibility offered by the Sedona Framework makes the controller useful not only for fan coil control. Sedona is an open-source software environment designed to make it easy to build smart, networked, embedded devices, which are well-suited for implementing control applications. Freely programmable controller with a modern programming tool and 18 onboard I/Os is suitable for most types of fan coil units and other comfort management applications. 4 Special Inputs Take advantage of a special input with support for the most popular types of temperature sensors, ability to read voltage, resistance, current, and dry contact measurements, with a fast pulse counter saving up to 100 pulses per second directly to the EEPROM memory. 4 Digital Inputs Dry contact inputs - made for monitoring. 100 Hz fast pulse counter with override function saves the real-time values to the non-volatile memory of the controller. 5 Digital Outputs There are onboard: 3 digital outputs 6 A for fan control, 1 digital output 10 A for electric heater, and 1 digital output 6 A for cooling valve actuator. 3 Analog Outputs 0-10 V DC analog outputs dedicated for a heating actuator, cooling actuator, and fan speed control. 2 Triac Outputs The FCU-HH controller is equipped with two triac outputs dedicated to heating and cooling thermal valve actuators. Outputs can be connected to actuators with a 230 V AC power supply. Triac outputs can work as typical binary outputs for binary temperature control or with PWM modulation. Open Communication The powerful FCU-HH controller is equipped with two RS485 interfaces with open protocols, BACnet MS/TP and Modbus RTU/ASCII. You can connect up to 128 devices on one bus. Simplified Configuration and Commissioning Process You can prepare your application with the use of a free of charge programming tool or configure the FCU-HH controller using our Quick Start-up manual and built-in DIP switches.


Hardware Specification 
ARM Cortex-M4 processor
2 RS485 interfaces
mini USB type B interface
Programmable DIP switches
DIP switches for configuration
Status LED indicators
DIN rail mounted
18 I/Os onboard

4 Special Inputs (SI) 
Temperature input: 10K3A1, 10K4A1, Carel 10K, 20K6A1, 2.2K3A1, 3K3A1, 30K6A1, SIE1, TAC1, 
Resistive input 0-1000 kΩ

Voltage input 0-10 V DC
Current input 0-20 mA
Dry contact input
Fast pulse counter up to 100 Hz saved in the EEPROM memory

4 Digital Inputs (DI) 
Dry contact inputs
Fast pulse counter up to 100 Hz saved in the EEPROM memory

5 Digital Outputs (DO)
3 digital outputs 6 A NO for fan control
1 digital output 10 A NO for electric heater and 
1 digital output 6 A NO for cooling valve actuator

3 Analog Outputs (AO) 
Output 0-10 V DC maximum load up to 20 mA
PWM: 0.01 Hz, 0.1 Hz, 1 Hz, 10 Hz, 100 Hz

2 Triac Outputs (TO) 
0.5 A @ 230 V AC for heating and cooling actuators
PWM: 0.01 Hz, 0.1 Hz, 1 Hz, 10 Hz, 100 Hz

Free software iSMA Tool & FCU Updater

Power Supply 
230 V AC


Related products

Products enquiry

Please complete the enquiry form. Our team will contact you within 2 hours. 
(please note Tyrrell Products operational hours 9am – 5pm UK time)

Please enable JavaScript in your browser to complete this form.