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Pre-Installation Guidelines
The basic intent of a proper storage of heavy duty/industrial tunnel damper is to prevent physical damage, material
corrosion, and deterioration of organic material.
1) Visually inspect the damper for damage. Store indoors, protected from sunlight, moisture, and flooding. Protect
dampers from debris and dirt accumulation. Keep all conduit entry plugs and actuator access covers in place.
2) Dampers may be stacked and stored horizontally if wood or equivalent spacers are placed between flanges to
protect finish. DO NOT store with axles vertical. Place dampers on pallets or supports to allow air circulation. DO
NOT store with damper directly on concrete or ground.
3) The damper drive should be stored in a clean dry area. Do not stack drives on top of one another. Add desiccant
to electrical compartment if storage area temperature drop below 38°F. Damage due to moisture is not covered
by actuator warranty.
4) Cycle damper with actuator once per year, a minimum of ten open/close cycles, to distribute the grease in
bearings and actuator.
5) Consult manufacturer if storage time exceeds two years.
Installation Guidelines
The basic intent of a proper installation is to secure the heavy duty/industrial tunnel damper into the opening in
such a manner as to prevent distortion of damper operation. The following items will air in completing the damper
installation in a timely and effective manner.
1) Dampers are supplied standard without mounting holes. Drill or punch as required. If mounting holes are supplied,
use appropriate gasketing between mating flanges. Closed cell sponge rubber, solid rubber, maximum 60
durometer, or fiberglass drop warp tape is recommended. If the damper is replacing existing damper, clean mating
surfaces prior to installing new damper.
2) Damper blades remain within the frame depth.
3) Damper may be installed with flow from either direction. Damper blade centerlines MUST be horizontal. Consult
Greenheck for modifications if damper is to be mounted with blade centerlines vertical.
4) Isolate damper from high vibratory loadings.
5) If any NEMA electrical enclosure is supplied, use appropriate electrical connections so as to maintain the NEMA
rating.
DO's
1) Use damper lifting lugs as provided.
2) Install all mounting bolts before tightening. Tighten in even and staggered pattern to evenly compress flange
gasketing.
3) Mating flange must be flat and in the same plane.
4) Verify that damper does not strike mating ductwork or internal ductwork reinforcing when the blade is in the open
position.
5) Provide expansion joints upstream/downstream for angled ductwork so the damper is not subjected to thermal/
wind load forces off the centerline of the damper.
DONT'S
1) Do not lift the damper using a chain/strap through the frame and the blade propped open as this could damage
the blade seal.
2) Do not use the actuator, linkage, or axles as a lifting point.
3) Do not use a prybar to match frame holes to mating ductwork as the frame can be warped or pulled out of square
by excessive force.
4) Do not tighten the mounting bolts by starting as one point and "walking" around the damper as an uneven flange
compression can result.
2
HTD Series
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