MEP-4201/4501/4901 1 Installation Guide
Installation Guide
Tri-State/Two-Position Actuators (25/45/90 in-lb.)
MEP-4201/4501/4901
Mounting 1
Wiring 2
Maintenance 2
More Information 2
Mounting
Illustration 1—Overview (Direct-Coupled Mounting)
1. Ensure the damper can move freely through its
entire range of motion, and x any binding before
installing the actuator. Turn the damper blade to
its fully closed position.
2. Press (to the right) and hold the gear disengage-
ment lever (see Illustration 1), rotate the actuator
to the fully closed position, and release the lever.
NOTE: Depending on the damper-seal design,
backing the actuator o its stop
approximately 5° may provide tight
damper shut-o.
3. Align the actuator and slide it onto the shaft.
4. Leaving a gap between the actuator and
mounting surface to prevent any binding, nger-
tighten the nuts on the V-bolt.
5. Insert the provided (HMO-4001/4002, dependent
on model) non-rotation bracket into the slot at the
base of the actuator and secure the non-rotation
bracket with two #8 or #10 self-tapping screws.
6. Evenly tighten the V-bolt nuts (30–35 in-lbs.
on MEP-4201 model or 60–70 in-lbs. on MEP-
4501/4901).
7. If desired, use a 7/64-inch hex key wrench to
loosen and position the end-stop screw.
NOTE: The two holes at the top of the actuator
are NOT for use in direct-coupled
applications. (They are for remote
mounting, such as with the optional
HLO-4001 Crank Arm Kit.) For mounting
to valves, see the appropriate valve
installation guide.
Gear
Disengagement
Lever
HMO-4002
Non-Rotation
Bracket
Mounting
Surface
1.625
(41.3)
6.000
(152.4)
3.406
(86.5)
Adjustable
Stop
° Rotation
Indicators
1.563
(39.7)
2.812
(71.4)
Gear
Disengagement
Lever
Removeable Conduit Fitting with
(2)1/2" NPS Threaded Holes (for
use with flexible conduit only)
HMO-4001 Non-Rotation “T”
Bracket included with MEP-4901
HMO-4002 Non-Rotation
Bracket included with
MEP-4201& MEP-4501
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