Belimo AFRB24-SR, AFRX24-SR Control Valve Actuators
Proportional, Spring Return, 24 V, for 2 to 10 VDC to 4 to 20 mA Control Signal
Spring return control damper actuators are direct coupled and require no crank arm or linkage. Capable of direct mounting to a jackshaft up to a 1.05” diameter. The actuator provides proportional damper control in response to a 2 to10 VDC or, with the addition of a 500Ω resistor, a 4 to 20 mA control input from an electronic controller or positioner. The actuators may be used for either clockwise or counterclockwise fail-safe operation. Actuators use a brushless DC motor controlled by a microprocessor and protected from overload at all angles of rotation. Run time is constant, and independent of torque. A 2 to 10 VDC feedback signal shall be provided for position feedback. Actuators are cULus Approved and have a 5 year warranty> Manufactured under ISO 9001 International Quality Control Standards.

Power supply 24 VAC ±20%, 50/60 Hz 24 VDC +20% / -10% 

Power consumption running 5.5 W, holding 3 W 

Transformer sizing 8.5 VA (class 2 power source) 

Overload protection electronic throughout 0 to 90° rotation 

Operating range Y 2 to 10 VDC, 4 to 20mA 

Input impedance 100 kΩ for 2 to 10 VDC (0.1 mA) 500 Ω for 4 to 20 mA 

Feedback output U 2 to 10 VDC (max. 0.5 mA) 

Direction of rotation spring reversible with CW/CCW mounting motor reversible with built-in switch 

Mechanical angle of rotation 90° (adjustable with mechanical end stop, 35° to 90°) 

Running time spring < 20 seconds @ -4°F to 122°F [-20°C to 50°C]; < 60 seconds @ -22°F [-30°C] motor 90 seconds 

Position indication visual indicator, 0° to 90° (0° is full spring return position) 

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