AUTOMATIC OPPOSED BLADE DAMPERS (AOBD)
5
68-0246
IMPORTANT
When installing damper in horizontal air duct, be
sure to mount the electric actuator and drive linkage
toward the top of the air duct. See Fig. 6.
Fig. 6. Correct damper mounting position.
INSTALLING AUTOMATIC OPPOSED BLADE DAMPERS (AOBD), SEE
FIG. 7)
1.
Be sure the AOBD is correctly sized to the air duct.
2.
Select an AOBD location that is at least three feet from
the furnace plenum.
3.
Cut a three-in. (76 mm) opening in one side of the air
duct at the location selected. Be sure the opening is cut
fully to the top and bottom air duct seams.
4.
Slide the AOBD into the air duct. Be sure the electric
actuator is mounted toward the top of the air duct.
5.
For small air duct sizes (20 x 8 in. 18 x 10 in, 16 x 12 in.
and smaller), secure the AOBD mounting plate to the air
duct with sheet metal screws provided.
6.
For large air duct sizes (20 x 8 in, 18 x 10 in., and 16 x
12 in. and larger), secure the mounting plate to the air
duct with the sheet metal screws provided. Then secure
the back of the AOBD to the air duct. If the back of the
AOBD cannot be reached, install two mounting tracks.
See Fig. 8.
INSTALLING MULTIPLE DAMPERS AND DAMPER MOUNTING
TRACKS
For air duct sizes longer than 30 in., use multiple dampers and
install mounting tracks inside the air ducts. See Fig. 8.
Fig. 7. Installing AOBD.
M2406A
INCORRECT
CORRECT
3 IN. (76 mm)
DUCT OPENING
1
1
2
2
DAMPER MOTOR ACTUATOR AND DRIVE LINKAGE MUST BE TOWARD
TOP OF DUCT.
USE 1/4 IN. (6 mm) SHEET METAL SCREWS PROVIDED.
3
3
FOR LONGER DUCTS OR VERTICAL DUCT APPLICATIONS, SECURE
BACK OF DUCT USING TWO SHEET METAL SCREWS.
M2275B
