42 CLCH-SVX03C-EN
Component Installation Requirements
Opposed-Blade and Parallel-Blade Dampers
The damper actuator is internally mounted on the end drive rod for mixing box module sizes 3, 6,
and 8 (see Figure 35). The driven damper rotates 90 degrees when the driver damper is turned
90 degrees.
Opposed-blade and parallel-blade dampers in unit sizes 10 to 120, as well as internal and external
face-and-bypass modules, have centered dampers with an internal jack-shaft (see Figure 36,
Figure 37, and Figure 38). A 95-degree actuator rotation gives a 90-degree blade travel.
Note: Damper blades should be checked for proper operation from full open to full closed position
before unit start up. Damper blade positioning may have changed due to shipping and
handling vibrations.
Figure 35. Typical mixing box configurations for unit sizes 3, 6, and 8
Figure 36. Typical mixing box configurations for sizes 10 to 120
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