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HVAC/RActuatorsBelimo

Belimo NFB24-SR-S

SKU: CS2234449MPN: NFB24-SR-S

Damper Actuator, 90 in-lb [10 Nm], Spring return, AC/DC 24 V, 2...10 V, 2 x SPDT, modulating

Belimo NFB24-SR-S
$494.43
Unit
Available on backorder
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Product Details

The NFB24-SR-S versions are provided with two built-in auxiliary switches. These SPDT switches provide safety interfacing or signaling, for example, for fan start-up. The switching function at the fail-safe position is fixed at +10°, the other switch function is adjustable between +10° to +90°. The actuator is shipped at +5° (5° from full fail-safe) to provide automatic compression against damper gaskets for tight shut-off.

The NFB and NFX series actuators provide true spring return operation for reliable failsafe application and positive close-off on air tight dampers. The spring return system provides constant torque to the damper with, and without, power applied to the actuator.

The actuator operates in response to a 2 to 10 VDC, or with the addition of a 500 ohm resistor, a 4 to 20 mA control input from an electronic controller or positioner. A 2 to 10 VDC feedback signal is provided for position indication. Not to be used for a master-slave application.

Attributes

Control modulating
Auxillary Switch 2 x SPDT
Fail-Safe Spring Return
Torque 90 in-lb
Nominal Voltage AC/DC 24 V
Transformer Sizing 6 VA (class 2 power source)
Enclosure UL Enclosure Type 2
Power Supply 24 VAC, ±20%, 50/60 Hz, 24 VDC, -10% / +20%
Power Consumption In Operation 3.5 W
Power Consumption In Rest Position 2.5 W
Electrical Connection (2) 18 GA appliance cables with ½” conduit connectors, 3 ft [1 m],
Overload Protection electronic throughout 0…95° rotation
Operating Range 2…10 V, 4…20 mA w/ ZG-R01 (500 Ω, ¼ W resistor)
Input Impedance 100 kΩ for 2…10 V (0.1 mA), 500 Ω for 4…20 mA
Position Feedback 2…10 V, Max. 0.5 mA
Angle Of Rotation 95°, adjustable with mechanical end stop, 35…95°
Direction Of Motion Motor selectable with switch 0/1
Position Indication Mechanical
Running Time (Motor) 95 s
Running Time Fail-Safe <20 s
Ambient Humidity max. 95% r.H., non-condensing
Ambient Temperature -22…122°F [-30…50°C]
Storage Temperature -40…176°F [-40…80°C]
Degree Of Protection Iec/En IP54
Degree Of Protection Nema/Ul NEMA 2
Connection cable
Servicing maintenance-free
Housing Material Galvanized steel and plastic housing
Nominal Voltage Dc 24 V
Nominal Voltage Ac 24 V
Noise Level, Motor 40 dB(A)
Torque Motor 90 in-lb [10 Nm]
Electrical Protection actuators are double insulated
Quality Standard ISO 9001
Noise Level, Fail-Safe 62 dB(A)
Agency Listing cULus listed to UL60730-1A:02; UL 60730-2-14:02 and CAN/CSA-E60730-1:02; Listed to UL 2043 - suitable for use in air plenums per Section 300.22© of the NEC and Section 602.2 of the IMC
Shaft Diameter ½…1.05” round, centers on ½” and ¾” with insert, 1.05” without insert
Auxiliary Switch 2 x SPDT, 3 A resistive (0.5 A inductive) @ AC 250 V, one set at 10°, one adjustable 10…90°
Fail-Safe Function Spring return
Control Type Web DC 2…10 V
Fail-Safe YES

Specifications

SKUCS2234449
MPNNFB24-SR-S

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