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Before Installing Damper in the Duct
1. If damper has more than one blade, determine which blade axle will be driven by the extended control shaft.
Always attach extended control shaft to a blade axle which is directly connected to the main linkage tiebar. DO
NOT attach extended control shaft to a crossover blade axle.
2. Cut hole approximately 1 in. diameter in the duct where damper drive blade axle will be located. Hole must
provide clearance for enlarged portion of the extended control shaft.
After Damper is Installed in Duct
1. Push extended control shaft through the hole in the duct and onto drive blade axle. Retainer clip should "click"
into groove on the drive blade axle and hold shaft into place. Standard control shaft location is the third blade
from the bottom on dampers with three or more blades. Control shaft location is the first blade from the bottom on
dampers with one or two blades.
2. Install the stand off bracket with provided cap screws, nuts, and #14 Tek screws.
3. Attach mounting plate to stand off bracket with (2) #10 Tek screws, as shown.
4. Attach cable operator to mounting plate with (2) #10 Tek screws, as shown.
5. Insert the end of the cable into the coupling on the cable operator. Tighten the set screw.
6. Use
⁄
in. bit driver to rotate cable until set screws on cable operator gear are orientated such that they are
1
4
accessible with a hex key. Tighten set screws.
7. Run the cable to termination point and secure the cable
at 3 ft. intervals and every change in direction. Cables
should be taut or nearly taut with a 4 in. minimum turn
radius. For cable runs longer than 20 ft., use of conduit is
recommended on straight run sections.
8. Attach the mounting bracket to the structural member
such that the bottom of the bracket is flush with the top
of the ceiling. (Illustration A)
9. Drill a
⁄
in. diameter hole in the ceiling location that lines
1
2
up with the centerline of the cable.
10. Use a
⁄
in. bit driver to balance your damper.
1
4
11. Select the appropriate nylon cap to cover the opening,
depending on the ceiling thickness. (Illustration A)
Attach to exposed cable.
Installation Instructions For Cable Operator with Square Wall/Ceiling Plate
Item
Qty
Description
1
1
Standoff bracket
2
1
Extension pin
3
1
Retaining clip
4
1
Mounting plate
5
1
Cable operator
6
4
#10 Tek screw
7
2
Cap screw
8
2
Nut
9
2
#14 Tek screw
Tools Required:
Part Number
⁄
5
651812
16
⁄
3
452509
8
⁄
in. electric drill
3
451738
8
⁄
in. bit driver
1036710
1
4
⁄
in. hex key
1036540
1
8
⁄
in. hex key
415555
5
64
415474
415455
417432
Illustration A
in. driver
in. driver
Crossover blade
axle
DO NOT ATTACH
control shaft here
3
MBD-15
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