Submittal Sheet

Technical Data
59718
Power Supply 24 VAC±20%, 50/60Hz, 24 VDC+20%/-10%
Power Consumption Running 9.5 W
Power Consumption Holding 4.5 W
Transformer Sizing 16 VA (class 2 power source)
Shaft Diameter 1/2” to 1.05” round, centers on 3/4” with
insert, 1.05” without insert
Electrical Connection (2) 3 ft, 18 GA appliance cables with 1/2”
conduit connectors
Overload Protection electronic throughout 0° to 95° rotation
Electrical Protection actuators are double insulated
Angle of Rotation max. 95° (adjustable with mechanical end
stop, 35° to 95°)
Torque (US unit) 270 in-lbs [30 Nm] minimum
Direction of Rotation (Motor) reversible with CW/CCW mounting
Direction of Rotation (Fail-Safe) reversible with CW/CCW mounting
Position Indication visual indicator, 0° to 95° (0° is full spring
return position)
Manual Override 5 mm hex crank (3/16” Allen), supplied
Running Time (Motor) 75 sec
Running Time (Fail-Safe) <20 sec @ -4°F to 122°F [-20°C to 50°C], <
60 sec @ -22°F [-30°C]
Humidity max. 95% RH non-condensing
Ambient Temperature Range -22°F to 122°F [-30°C to 50°C]
Storage Temperature Range -40°F to 176°F [-40°C to 80°C]
Housing NEMA 2, IP54, UL enclosure type 2
Housing Material Aluminum die cast and plastic casing
Agency Listings† cULus acc. to UL60730-1A/-2-14, CAN/CSA
E60730-1:02, CE acc. to 2004/108/EC and
2006/95/EC
Noise Level (Motor) ≤56.5 dB (A)
Noise Level (Fail-Safe) ≤71 dB (A)
Servicing maintenance free
Quality Standard ISO 9001
Weight 10.14 lbs [4.6 kg]
Auxiliary Switch 2 x SPDT, 3A resistive (0.5A inductive) @
250 VAC, one set at +10°, one adjustable 10°
to 85°
†Rated Impulse Voltage 800V, Type of Action 1.AA.B, Control Pollution Degree 3.
Torque min. 270 in-lb, for control of air dampers
Application
For On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing
should be done in accordance with the damper manufacturer’s specifications.
Control is On/Off from an auxiliary contact or a manual switch. The actuator
is mounted directly to a damper shaft up to 1.05” in diameter by means of its
universal clamp. A crank arm and several mounting brackets are available for
applications where the actuator cannot be direct coupled to the damper shaft.
Maximum of two EF’s can be piggybacked for torque loads of up to 540 in-lbs.
Minimum 3/4” diameter shaft and parallel wiring.
Operation
The EF..24-S 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 EF..24-S series provides 95° of rotation and is
provided with a graduated position indicator showing 0° to 95°. The actuator
may be stalled anywhere in its normal rotation without the need of mechanical
end switches. The EF..24-S versions are provided with two built-in auxiliary
switches. These SPDT switches are provided for 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 +85°. The
EF..24-S actuator is shipped at +5° (5° from full fail-safe) to provide automatic
compression against damper gaskets for tight shut-off.
Installation Note: Use flexible metal conduit. Push the UL listed conduit fitting
device over the actuator’s cable to butt against the enclosure. Screw in conduit
connector. Jacket the actuator’s input wiring with UL listed flexible conduit.
Properly terminate the conduit in a suitable junction box.
Dimensions (Inches[mm])
4.74" [120.5]
3.15" [80]
1.06" [27]
0.19" [4.85]
0.53
" [13.5]
5.43" [138]
4.41" [112]
0.59" [15]
2.76" [70]
1.38" [35]
0.52" [13.3]
7.40" [188]1.97" [50]
0.20" [5.2]
5.63" [143]
0.33" [8.3]
2.13" [54]
2.44" [62]
11.32" [287.5]
13.09" [332.5]
1.95" [49.5]
1.77"
[45]
EFB24-S - Damper Actuator
On/Off, Spring Return, 24 VAC/DC
800-543-9038 USA 866-805-7089 CANADA 203-791-8396 LATIN AMERICA / CARIBBEAN
Date created, 03/07/2016 - Subject to change. © Belimo Aircontrols (USA), Inc.