®
MBD-15 1
Document 464599
MBD-15
Extension Pin and Manual Quadrant Kit
Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble, install,
operate or maintain the product described. Protect yourself and others by observing all safety information. Failure
to comply with these instructions will result in voiding of the product warranty and may result in personal injury
and/or property damage.
CLOSED
OPEN
5
6
4
1
2
EXTENSION PIN
REAR VIEW
CONTROL SHAFT
3
7
For Dampers Installed In
Ducts
Extended control shaft is
installed from outside of duct
after damper is installed.
Install as shown to the right.
Crossover blade
axle
DO NOT ATTACH
control shaft here
Tools Required:
5⁄16 in. hex nut driver
3⁄8in. electric drill
1⁄2in. open end wrench
No. Qty Description
1 1 Standoff bracket
2 1 Extension pin
3 1 Retaining clip
4 1 1/2 in. Manual quadrant
5 1 Open and close labels
6 2 TEK screws
7 1 Washer
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
xtended control shaft and screw bracket to the duct.
Make sure screws do not interfere with damper
linkage or blade movement. Assemble manual
quadrant to the extension 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. Apply “OPEN” and “CLOSED” labels if
damper movement is opposite to that engraved on the
manual quadrant.
4. Set the damper to the desired position and tighten
wing nut on the manual quadrant to hold the damper
in place.
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.
