Frese’s new Modbus Actuator offers several new functionalities to optimise heating or cooling systems via BMS.

Energy optimization requires data and insight, and that is exactly what the Frese Modbus Actuator delivers.

In addition to operating the pressure independent control valves in your heating and cooling system remotely via the building’s BMS, it provides important information about system performance and potential efficiency improvements.

Frese product manager Przemyslaw Klosiak said the Modbus Actuator comes in two different sizes and is compatible with Frese’s patented OPTIMA Compact series from DN15 to DN32 and DN40 to DN50.

Klosiak said the complete library of Frese valves is stored in the actuator, easing the commissioning process, as flow setting can be done remotely.

The actuator itself is very compact and can be mounted in any direction due to its IP54 protection class.

“By connecting two temperature sensors directly to the actuator – one on the supply line and one on the return line – it is possible to monitor the temperature difference and observe how every single terminal unit performs,” he said.

“This is particularly useful in cooling systems, which suffer from Low Delta T Syndrome leading to reduced energy efficiency.

“Any PT1000 sensor from any manufacturer can be used, which makes it a very flexible solution for the customer.”
Klosiak said the measured temperature difference, along with the flow rate indication feedback from the actuator to the BMS, enables the system operator to calculate energy consumption in each terminal unit.

“With this insight it is possible to monitor the system in its entirety and to identify specific places where adjustments can be made to improve energy efficiency and save money,” he said.


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