Greenheck DFD Series Installation, Operation And Maintenance Manual page 34

Pre-Installation Guidelines
The basic intent of a proper installation is to secure the volume control damper into the opening in such a manner
as to prevent distortion and disruption of damper operation. The following items will aid in completing the damper
installation in a timely and effective manner.
1) Check schedules for proper damper locations within the building. Visually inspect
the damper for damage.
2) Lift or handle damper using sleeve or frame. Do not lift damper using blades,
linkage, actuators, or jackshafting. When handling multiple section assemblies,
use sufficient support to evenly lift at each section mullion (see drawing). Do not
drag, step on, apply excessive bending, twisting, or racking.
3) Do not install screws in damper frame that will interfere with unexposed blade
linkage and prevent damper blades from opening and/or closing.
4) Damper must be installed into duct or opening square and free of twist or other
misalignment. Damper must not be squeezed or stretched into duct or opening.
Out of square, racked, twisted or misaligned installations can cause excessive leakage and/or torque requirements
to exceed damper/actuator design.
5) Damper and actuator must be kept clean, dry and protected from dirt, dust and other foreign materials prior to
and after installation. Examples of such foreign materials include but are not limited to:
a) Mortar dust
b) Drywall dust
c) Firesafing materials
d) Wall texture
e) Paint overspray
6) Damper should be sufficiently covered as to prevent overspray if wall texturing or spray painting will be performed
within 5 feet (1.50m) of the damper. Excessive dirt or foreign material deposits on damper can cause excessive
leakage and/or torque requirements to exceed damper/actuator design.
7) ACCESS: Suitable access (actuator maintenance, etc.) must be provided for damper inspection and servicing.
Where it is not possible to achieve sufficient size access, it will be necessary to install a removable section of duct.
Installation
1) Dampers ordered with "nominal" sizing are undersized
a 12 in. x 12 in. (305mm x 305mm) nominal damper will measure 11
ordered with "actual' sizing are not undersized. The duct or barrier opening that the damper is being mounted in
should be ⁄ in. (6mm) larger than the damper dimensions in both width and height. The opening should also be
1
4
straight and level (Figure 1).
A
C
E
Figure 1
2 VCD, FBH, and FBV Series
B
AF=BE
D
AB=CD
F
⁄ in. (6mm) to facilitate ease of installation. For example,
1
4
⁄ in. x 11 ⁄ in. (298mm x 298mm). Dampers
3 3
4 4
Do not twist
or bow. Mount
damper plumb
in the opening
Multi section dampers
.
Spreader Bar
Attachments