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12.1 Circular motorized damper retrofit (cmdr)
12.1.1 Functional Description
This device is designed to be inserted in existing metallic round ducts to upgrade the house to
use zoning systems with minimum changes. Once inserted in the duct, it will act as a regular
circular damper controlling the air flow in the duct as commanded by the zoning system.
12.1.2 Component Description
The damper is composed of a gate with rubber foam to seal the duct, a face plate with rubber
foam to seal the installation, and a motor.
Fig. 3 - Retrofit round damper
12.1.3 Assembly and Connection Instructions
Follow this procedure to install the Retrofit Round Damper:
1)
Align the cut out template supplied with the damper along the center of the metal duct.(Fig.
4).
2)
Make a cut out in the duct according to the shaded area in the template.
3)
Drill two screw bite holes on each side where the circles in the template are located. It is
important to have the damper installed properly to avoid interferences between the damper
mechanism and the edges of the cut out area.
4)
Insert the damper and attach it to the duct with (4) sheet metal screws. (Fig. 5).
Fig. 4
Fig. 5
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