Orion System Zoning - Manual (Page 21)

Orion Systems 21
Zoning Design Guide
Rectangular Dampers
The Orion Rectangular Damper is used in applications
where rectangular duct is specified or required because
of space limitations or job requirements. Rectangular
Dampers are only available for pressure dependent ap-
plications. A Rectangular Damper Kit is used in con-
junction with the Rectangular Damper to provide con-
trol of the damper. Rectangular Damper Kits are avail-
able for Bypass, Pressure Dependent Zone and Slaved
Zone configurations. Rectangular Damper Kits are not
available for pressure independent applications.
The Rectangular Damper utilizes opposed blades of
airfoil design for improved air flow control. The Rect-
angular Damper frame is made of .080 thick extruded
aluminum. The blades are also made of extruded alu-
minum. Blade pins are 7/16” hexagon shaped alumi-
num fixed to a Celcon inner bearing rotating within a
polycarbonate outer bearing inserted in the damper
frame. The Damper linkage is mechanically assembled
and located in the damper frame. The linkage compo-
nents are constructed of aluminum, zinc and nickel
plated steel. Blade gaskets are made of extruded EPDM
material and are secured within an integral slot on the
blade. Jamb seals are of extruded TPE material for low
leakage through the damper when closed. The control
shaft is 1/2” diameter hexagon shaped rod and can be
extended 9” past the damper frame for connection to
the damper actuator. The damper shaft is shipped re-
tracted into the frame area and must be adjusted to the
required length in the field.
Mounting
The Rectangular Damper should be mounted in the
ductwork according to standard duct installation
practices. The rectangular damper should be selected
for the nominal inside duct size. All Rectangular
Dampers are supplied with 1” flanges all around the
damper frame, making the overall damper width and
height 2” larger than the nominal inside duct size thus
providing for external flange mounting to ductwork.
See Figure 1-13.
The damper shaft is shipped retracted into the damper
frame. Loosen the two nuts on the U-bolt that secures
the damper shaft to the damper blade and adjust to
length. It is recommended that the shaft length be
adjusted so approximately 4” of shaft extends beyond
the inside of the damper frame. Retighten the two nuts
on the U-bolt that secures the damper shaft to the blade.
After installation of the Rectangular Damper to the
ductwork, it is recommended that insulation be applied
around any non-insulated surface on the ductwork where
the Rectangular Damper was installed.
Rectangular Damper Kit Installation
The Rectangular Damper Kit is simply slid over the
damper shaft, the actuator shaft collar setscrews
tightened and the supplied self tapping screws are used
to mount the enclosure to the ductwork. Detailed
mounting and installation instructions are provided with
each kit. A knockout is provided in the front access
cover, which can be punched out to allow for damper
shaft lengths, which extend past the enclosure depth.
When mounting the Rectangular Damper Kit, be sure
to allow clearance for removal of the access cover.
Conduit knockouts are provided in the top and bottom
of the enclosure for simplified wiring installation.
Rectangular Damper Kit
Rectangular Damper
Figure 1-13: Rectangular Damper & Damper Kit
Flanged Ductwork