Overview
The Belimo TFRB24 is a 24V spring return valve actuator designed for basic on/off fail-safe control of small commercial HVAC water valves.
Features
- Reliable mechanical spring return returns valve to default position during power loss
- Simple two-wire 24 VAC/VDC power connection for on/off control
- Low operating power consumption saves energy across large installations
- Compact construction suited for small space constraints
Specifications
- Nominal Voltage: AC/DC 24 V
- Control Type: On/Off
- Actuator Type: Spring Return
- Torque: 22 in-lb [2.5 Nm]
- Power Consumption: 2 W running, 1.3 W holding
Applications
- Fail-safe on/off water control in fan coil units and unit ventilators
- Automatic safety isolation in small commercial hydronic piping loops



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