Greenheck HTOD-331 Installation Manual
Document Number 479583
®
HTOD SERIES
Installation, Operation, and Maintenance Instructions
HTOD-330 HTOD-331
RECEIVING AND HANDLING
Upon receiving dampers, check for both obvious
and hidden damage. If damage is found, record all
necessary information on the bill of lading and file
a claim with the final carrier. Check to be sure that
all parts of the shipment, including accessories, are
accounted for.
Dampers must be kept dry and clean. Indoor
storage and protection from dirt, dust and the
weather is highly recommended. Do not store at
temperatures in excess of 100°F (37ºC).
Due to continuing research, Greenheck reserves the right to change specifications without notice.
This manual is the property of the owner, and is required for future maintenance. Please leave it with the
owner when the job is complete.
Improper installation, adjustment, alteration,
service or maintenance can cause property
damage, injury or death. Read the installation,
operating, and maintenance instructions
thoroughly before installing or servicing this
equipment.
SAFETY WARNING:
Storage of Dampers Prior to Installation
The basic intent of proper storage of heavy duty/industrial tornado 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.
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) Consult manufacturer if storage time exceeds two years.
Installation Guidelines- Failure to follow instructions will void all warranties
The basic intent of a proper installation is to secure the heavy duty/industrial tornado 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) Dampers are supplied standard without mounting
holes. Drill or punch as required. Use appropriate
gasketing between mating flanges. Closed cell
sponge rubber, solid rubber, maximum 60 durometer,
or fiberglass drop warp tape is recommended. If
damper is replacing existing damper, clean mating
surfaces prior to installing new damper.
2) Damper blades remain within the frame depth.
3) The HTOD-330 is installed the same direction as
flow. The HTOD-331 is installed opposite direction
as normal flow. Damper blade centerline MUST be
horizontal. Consult Greenheck for modifications if
damper is to be mounted with blade centerlines
vertical.
4) Isolate damper from high vibratory loadings.
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 blade is in the
open position.
5) Provide expansion joints upstream/downstream
for angled ductwork so damper is not subjected to
thermal/wind load forces off the centerline of damper.
Dont’s
1) Do not lift damper with chain/strap with blade
propped open and with chain/strap through frame as
this could damage blade seal.
2) Do not use linkage or axles as lifting point.
3) Do not use prybar to match frame holes to mating
ductwork as frame can be warped or pulled out of
square by excessive force.
4) Do not tighten mounting bolts by starting at one
point and “walking” around the damper as uneven
flange compression can result.
Damper Maintenance
Greenheck's dampers are designed to be trouble free and hassle free under normal operation. Dampers are to be
installed square and straight so as to prevent binding during operation. The following annual damper maintenance
suggestions will help to insure proper damper operation and increase the life expectancy of the damper.
Foreign Matter Over the course of time, dirt and grime may collect on damper surfaces. The damper
surfaces should be cleaned to prevent hindrance to airflow.
Moving Parts Make sure that parts such as linkage, bearings, blades, etc. that are intended to move
freely, can do so. Lubricating these components can prevent possible rusting and
unnecessary friction increase. Use only a molybdenum spray oil or similar graphite based
oil on sleeve bearings as regular lubricating oil will attract dirt.
Bearings. Synthetic, oil impregnated, carbon sleeve, and ball bearings (without grease
fittings) do not require lubrication. Ball bearings with grease fittings should be lubricated as
follows:
Maximum Duct Temperature Lubricant Minimum Frequency
250° F 121° C
600° F 316° C
Closure Remove foreign materials that may be interfering with blade closure or effective sealing of
the blades with each other or with the frame.
Blade Seals. Inspect yearly and replace as necessary.
Axle Seals. Inspect and adjust as necessary.
Operation While operating the damper through its full cycle, check to see that the blades open and
close properly. If there is a problem, check for loose linkage. Tighten the linkage where
required.
NLG1 Grade 2 lithium
12-hydrostearate grease
Hi temperature synthetic, Mobillith SHC100 or equal
twice a year
four times a year
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