5
Reversible Clamp Quick Mount (LMQB, NMQB, and AMQB)
Standard Mounting
1. Turn the damper shaft until the blades are fully closed.
2. Slip the actuator’s universal clamp over the damper shaft. Make sure
that the duct and the controls on the cover are accessible. Place the
actuator in the desired mounting position.
Hand tighten the two nuts on the actuators universal clamp.
3. Disengage the actuator gear train by pressing the manual override
button and rotate the clamp until centered.
Slide the anti-rotation strap up under the actuator so it engages the
actuator at the center cutout. Bend the bracket as needed to support
the rear of the actuator. Secure to ductwork with self-tapping screws
(No. 8 recommended).
4. Loosen the nuts on the universal clamp. Press the manual override
button and rotate the clamp to about 5° from the closed position
(
¹⁄₁₆
” to
¹⁄₈
” between stop and clamp).
Tighten the two nuts on the universal clamp with a 10 mm wrench
(see table for required torque).
5. Snap on the reflective position indicator.
Adjust end-stops, if required
6. Mount actuators indoors. If mounted outdoors, use approved protective
enclosure.
The damper is now fully closed but the actuator is 5° from fully closed.
This is called “pre-loading” the actuator. When the actuator is powered
and sent to the closed position: it will put its full torque on the shaft
compressing the edge and blade seals. This ensures that the damper
will meet its leakage rating. The actuator is electronically protected from
overload and will not be damaged.
Testing the Installation Without Power
1. Disengage the gear train with the manual override button and move the
shaft from closed to open to closed. Ensure that there is no binding and
that the damper goes fully open and closes with 5° of actuator stroke left.
2. Correct any problems and retest.
