The EF actuator utilizes rugged components in a
pressure cast aluminum housing for added strength
and reliability. It offers a high torque output of
270 in-lbs and a NEMA 4 option to meet tough
environmental conditions found in many HVAC
The EF actuator was developed to satisfy high torque
applications with a single actuator. The EF can take
the place of two classic AF actuators in a piggy-back
mounted application; simplifying wiring and mounting
requirements while reducing material and installation
costs. The NEMA 4 protection feature allows
complete access to change the direction of rotation
and allows locking or manually overriding the actuator.
The EF provides a cost effective and flexible solution
that will deliver years of dependable performance over
a wide range of operating conditions.
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.
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