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…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…95° rotation
Electrical Protection
actuators are double insulated
Angle of rotation
95°
Direction of motion motor
selectable by ccw/cw mounting
Torque motor
70 in-lb [8 Nm] from 32…350°F [0…177°C]
Direction of motion fail-safe
reversible with cw/ccw mounting
Position indication
Mechanical
Running Time (Motor)
15 s between 32…350°F [0…177°C], <15 s at rated voltage & torque
Running time fail-safe
15 s
Ambient humidity
max. 95% r.H., non-condensing
Ambient temperature
32…122°F [0…50°C]
Storage temperature
-40…176°F [-40…80°C]
Degree of Protection
IP40, NEMA 1
Housing material
galvanized 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)
Noise level, fail-safe
62 dB(A)
Servicing
maintenance-free
Quality Standard
ISO 9001
Weight
5.7 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])
Standar
d: 1/2″ to 1.05″ Optional* 3/8″ to 3/4″*with K4 US clamp1.97″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