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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 washer over the extended control shaft and screw bracket to the duct. Make sure
screws do not interfere with damper
bracket assembly (screws provided).
3. With the damper either fully open or closed, lock manual quadrant to the extended control shaft so the manual
quadrant can move the damper between open or closed.
Note: Tighten down the bolt on manual quadrant to 250 in. lb. of torque.
4. Set the damper to the desired position and tighten wing nut on the manual quadrant to hold the damper in place.
Installation Instructions For Cable Operator and Round Ceiling Cup
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
2
MBD-15
linkage or blade movement. Assemble manual quadrant to the extension
Caution
Standoff bracket with the washer is needed to
support the extended control shaft. If not installed as
directed, the extended control shaft may not operate
the damper correctly.
Tools Required:
Part Number
651812
452509
⁄
3
451738
8
1036710
⁄
1
1036540
1
415555
⁄
415474
5
415455
417432
⁄
in. driver
5
16
⁄
in. driver
3
8
in. electric drill
⁄
in. drill bit
1
2
in. bit driver
4
⁄
in. hex key
8
in. hex key
64
Crossover blade
axle
DO NOT ATTACH
control shaft here
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