Product manual

McQuay IM 782-4 9
Installation Guidelines
Figure 7: Factory Mounted Actuator
For good air flow control, adjust the linkage so that the damper
blades do not open beyond 70°. Opening a damper blade
beyond 70° will have little effect on unit performance.
Do not “over-close” the low-leak damper blades as the blades
may lock up if the accompanying seal goes over the center of
the adjoining blade. Instead, close the damper blades until the
edge seal just lightly contacts the adjoining blade.
Installing Damper Actuator
1 Turn the damper shaft until the blades are fully closed.
2 Place the actuator’s universal clamp over the damper
shaft (Figure 8). Make sure that the controls on the
actuator cover are accessible. Place the actuator in the
desired mounting position.
Figure 8: Actuator on Damper Shaft
3
Disengage the actuator gear train by pressing the manual
override button (Figure 9) and rotate the clamp until
centered.
Figure 9: Actuator Manual Override Button and Strap
4 Slide the anti-rotation strap (Figure 9) under the actuator
so it engages the actuator at the center of the actuator cut
out (located on the back side). Bend the bracket as
needed to support the back side of the actuator. Secure
the strap/actuator to ductwork with self-tapping screws
(#8 recommended).
5 Loosen the nuts on the universal clamp. Press the manual
override button and rotate the clamp to about 5°
(Figure 10) from the closed position (1/16" to 1/8"
between stop and clamp).
Figure 10: Actuator Universal Clamp Rotation
6
Tighten the two nuts on the universal clamp with a
wrench.