Product Overview

Description and Application
These compact but powerful direct-coupled Con-
trolSet
®
actuators provide two-position, tri-state, or
proportional control for dampers or valves in HVAC
systems. Ecient, durable, capacitor-driven fail-safe
with switch-selectable direction provides consis-
tent torque in both powered and fail-safe modes. A
patent-pending noise reducer provides whisper-qui-
et operation in both modes. A minimum torque of 25
(MEP-42xx), 45 (MEP-45xx), or 90 (MEP-49xx) in-lb.
is available over the 95° angular rotation.
MEP-4xx2 proportional models accept a 2–10 VDC
control signal input from a thermostat, controller,
or building automation system. “Anti-jier” cir-
cuitry signicantly reduces hunting and needless
wear (from unnecessary miniscule position changes
caused by undamped analog input signals) on the
actuator, valve, or damper components. A user-ini-
tiated, auto-mapping feature provides more precise
equipment control by reassigning the 2–10 VDC
input signal range over a reduced rotation range.
These models also feature a switch-selectable, 1–5 or
2–10 VDC voltage feedback output that is propor-
tional to the actuator position.
MEP-4xx1 tri-state/two-position (four-wire) models
are designed for use with oating thermostats or
controllers. MEP-4xx4/4xx5 two-position (two-wire)
models are available in 24 VAC/VDC or 100–240
VAC models.
MEP-4x7x models also have one fully adjustable,
built-in SPDT auxiliary switch for remote position
indication or equipment interface. MEP-497x models
include a second xed switch at 10° from full CW
direction. A three-foot cable is included with the
switch(es).
MEP-4xxxV actuators have brackets with a patent-
pending quick-mounting mechanism. See (Quick-
Mounting) “V” Models Valve Cross-Reference on
page 5 for more information.
All actuators mount directly to 1/4- to 5/8-inch (6
to 16 mm) round shafts or 1/4- to 7/16-inch (6 to 11
mm) square shafts, eliminating the need for ex-
pensive and complicated linkages. A non-rotation
bracket, to prevent lateral movement, is included
with each actuator. A gear disengagement buon al-
lows easy manual positioning of the actuator.
Specifications and design subject to change without notice.
Description and Application 1
Features 1
Models 2
Specifications 2
(Quick-Mounting) “V” Models Valve Cross-Reference 4
More Information 4
Features
◆ Ecient, durable, capacitor-driven fail-safe op-
tion with switch-selectable direction provides
consistent torque in both powered and fail-safe
modes
◆ The fail-safe option, on proportional and tri-state
models, can be turned o temporarily for testing
purposes or permanently if desired
◆ Proportional models include “anti-jier” circuit-
ry, optional auto-mapping of the full input signal
range over a reduced actuator stroke, and switch-
selectable 1–5 or 2–10 VDC feedback
◆ MEP-4x7x models have one fully adjustable,
built-in SPDT auxiliary switches, and MEP-497x
models include a second xed switch at 10° from
full CW direction
◆ Connections are made on either xed terminals
that accept 12–26 AWG wiring or prewired 3-foot,
18 AWG cable(s)
◆ Direct mounting to standard shaft sizes, gear dis-
engagement buon, and adjustable mechanical
end stop
◆ Patent-pending valve body quick-mount option
on MEP-4xxxV models
MEP-4200/4500/4900 Series
Fail-Safe, Direct-Coupled, Actuators (25/45/90 in-lb.)
NOTE: For similar actuators without fail-safe, see
the MEP-4000/4800 Series Data Sheet and
the MEP-4201/4501/4901 Data Sheet.
(Size Shown Relative
to a Quarter)