Technical Data
1446
Power Supply
24 VAC, ±20%, 50/60 Hz, 24 VDC, 0% /
+50%
Power consumption in operation 27 VA
Power consumption in rest
position
3 W, 6.5 VA, End stop 55 VA, 2.5 A slow
blow fuse *
Transformer sizing
40 VA (class 2 power source)
Shaft Diameter
1/2” to 1.05” round, centers on 1/2” and
3/4” with insert, 1.05” without insert
Electrical Connection
18 GA, 3 ft [1 m], 2 color coded wires
Overload Protection
electronic throughout 0° to 95° rotation
Electrical Protection
actuators are double insulated
Angle of rotation
95°
Torque motor
70 in-lb [8 Nm] from 32...350°F [0...177°C]
direction of rotation motor
reversible with CW/CCW mounting
direction of rotation spring-return reversible with cw/ccw mounting
Position indication
visual indicator, 0° to 95° (0° is full spring
return position)
Running Time (Motor)
15 sec between 32...350°F [0...177°C], <15
sec at rated voltage & torque
Running Time (Fail-Safe)
15 sec
Ambient humidity
5...95% r.H. non-condensing
Ambient temperature
32...122°F [0...50°C]
Non-operating temperature
-40...176°F [-40...80°C]
Degree of Protection
IP40, NEMA 1
Housing material
zinc coated steel
Gears
steel, permanently lubricated
Agency Listing
cULus listed to UL873 and CAN/CSA C22.2
No.24, UL 2043 Listed for air plenum
installation per NEC 300.22 and IMC
Section 602
NYC Department of Buildings MEA 197-
07-M.California State Fire Marshal Listing
3210-1593:101.
Noise level, motor
45 dB (A) motor, 62 dB (A) spring,
inaudible holding
Maintenance
maintenance free
Quality Standard
ISO 9001
Weight
5.71 lb [2.8 kg]
† UL File XAPX.E108966
Fire & Smoke damper actuator
Application
The type FSNF spring-return actuator is intended for the operation of smoke
and combination fire and smoke dampers in ventilation and air-conditioning
systems. The actuator will meet requirements of UL555 and UL555S when
tested as an assembly with the damper and will meet requirements of UBC for
15 second opening and closing at 350°F. Square footage of damper operated
will depend on make and model and the temperature required.
IMPORTANT 24VDC NOTE: The FSNF24 & -S models will not operate below
24VDC. A filtered and regulated power supply must be used.
Operation
Mounting of the actuator to the damper axle shaft or jackshaft (3/8” to 1.05”) is
via a cold-weld clamp. Teeth in the clamp and V-bolt dig into the metal of both
solid and hollow shafts maintaining a perfect connection. The specially designed
clamp will not crush hollow shafts. The bottom end of the actuator is held by an
anti-rotation strap or by a stud provided by the damper manufacturer.
The actuator is mounted in its fail safe position with the damper blade(s) closed.
Upon applying power, the actuator drives the damper to the open position. The
internal spring is tensioned at the same time. If the power supply is interrupted,
the spring moves the damper back to its fail-safe position.
Dimensions (Inches[mm])
Standard:
1/2" to 1.05"
Optional*
3/8" to 3/4"
*with K4 US clamp
1.97"
3.15" [80
]
3.86" [98
]
2.24" [57]
[5
]
[50]
1.93" [49]
2.89" [73.5]
2.64"
[67]
0.26" [6.5]
5.85" [148.5]
10.20" [259]
0.35" [9]
0.39" [10]
0.65" [16.5]
0.19" [5]
[ø41.2]
ø1.62"
[191.6]
7.54"
0.19"
3.25" [82.7]
Safety Notes
* Neither UL nor Belimo require local over-current protection. The FSNF
actuators draw higher peak current when driving against any type of stop. If
used, this requires the value of a local fuse or breaker to be increased to avoid
nuisance opening or tripping. A 2.5 amp slow blow should be used for 24VAC.
A 0.5 amp slow blow should be used for 120 VAC. A 0.25 amp slow blow
should be used for 230V and a 0.3 amp slow blow for 208 VAC. Transformers:
Note that while a 24V 100VA transformer would handle 2 actuators, a 4 A
breaker or plug fuse is insufficient. A 5 amp slow blow would be required.
Belimo Fire & Smoke actuators have passed the AMCA 520 and UL 555S Long
Term Holding test. No special cycling is required during prolonged periods
when actuator is driven open and held there. Periodic testing of dampers and
actuators per local codes and NFPA 80 and NFPA 105 are required.
The actuator contains no components which the user can replace or repair.
A 1/2” threaded connector is standard. FSNFxx-FC models have a 3/8” Flex
Connector. Other than the connector, these actuators are identical to the
conduit connector version.
⚠
WARNING: For Belimo Products sold in California, these Products do or
may contain chemicals which are known to the State of California to cause
cancer and or birth defects or other reproductive harms. For more information
see www.p65warnings.ca.gov.
FSNF24 US
On/Off, Spring Return, 350°F [177°C] for a half hour, 15 Seconds Cycle Time
800-543-9038 USA
866-805-7089 CANADA
203-791-8396 LATIN AMERICA / CARIBBEAN
Date created, 04/10/2019 - Subject to change. © Belimo Air
controls (USA), Inc.
