Greenheck HTD Series User manual

HTD Series - Tunnel Dampers 1
HTD Series
TUNNEL DAMPERS
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 instructions could result in personal injury and/or property damage!
Table of Contents
Electrical Guidelines ......................................1
Pre-Installation Guidelines ............................2
Installation Guidelines ...................................2
Maintenance .................................................3
Troubleshooting .........................................3-4
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 (38°C).
This manual is the property of the owner and is required for future maintenance. Please leave it with the owner when
the jobs is complete.
Safety Warning
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.
Electrical Guidelines
All wiring shall be done in accordance with the
National Electrical Code ANSI/NFPA-70 latest edition,
any local codes that may apply, and wiring diagrams
developed in compliance with the job or project
design and specifications.
Important!
Electrical input may be needed for this equipment.
This work should be performed by a qualified
electrician. Verify power before wiring actuator.
Greenheck is not responsible for any damage to, or
failure of the unit caused by incorrect field wiring. To
avoid causing death or serious bodily harm to building
occupants, follow all instructions carefully. Dampers
must close completely to preserve the integrity of the
fire smoke separation.
Electrical Guidelines
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HTD Series2
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.
Pre-Installation Guidelines
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.

HTD Series 3
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 ensure proper operation and increase the life expectancy of the damper.
Foreign Matter Over the course of time, dire, 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:
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, especially at the actuator. Tighten the linkage where required.
Actuator Cycle test actuator per manufacturer's recommendations.
The following is a cause and correction list for common concerns with the damper
Problem Possible Cause Solution
Damper does not move
No power to actuator Verify presence of correct power to actuator
Actuator failed Power actuator independently of damper
Actuator attempting to rotate in wrong
direction
Check wiring. Run actuator independent of damper if
necessary.
Linkage/coupling failed Inspect coupling, keys, and connecting linkage for
failed or broken components. Replace as required.
No modulating signal
Verify presence of modulating signal. Verify signal is
compatible with actuator.
Verify if signal is driving actuator in the correct
direction
Damper linkage failed Inspect damper for failed clevis pins, clevises, or
crankarms and replace as necessary.
Obstruction in damper linkage or inside
duct
Inspect for projecting mounting bolts, debris inside
damper and remove.
Maximum Duct
Temperature
°F °C Lubricant Minimum Frequency
250 121 NLGI Grade 2 lithium
12-hydrostearate grease
twice a year
600 316 Hi temperature synthetic,
Mobilith SHC100 or equal
four times a year
Damper Trouble Shooting

The following is a cause and correction list for common concerns with the damper
Problem Possible Cause Solution
Damper attempts to move but,
does not open fully
Actuator sizing incorrect
(excessive torque required)
Verify that correct operating pressures, velocities,
and temperatures were given to manufacturer for
actuator sizing. Replace actuator if necessary.
Obstruction in damper linkage or inside
duct
Inspect for projecting mounting bolts, debris inside
damper and remove.
Modulating control not going full span Verify control signal span from controller
Actuator linkage incorrectly adjusted
Power actuator, independently if necessary, to verify
that is moving full stroke. Adjust actuator drive
linkage or replace coupling spider if necessary.
Damper with jamb seals installed with
blades vertical
Consult factory, for modifications if vertical blade
orientation not specified on damper with seals.
Damper linkage modified in the field Readjust linkage so blade rotates fully open and
closed.
Linkage pivots failed Replace linkage bars, clevises and pins as required.
High noise level
Very high velocity/flow Reduce flow through damper.
No seals on dampers Retrofit with blade edge and jamb seals.
Damper not closing fully Readjust actuator or drive linkage to fully close
damper.
Excessive leakage across damper
Damper not closing fully Readjust actuator or drive linkage to fully close
damper.
Damper not equipped with blade and
jamb seals
Retrofit with blade edge and jamb seals.
Blade edge seals failed Replace blade edge seals.
Stop angles not contacting blade edges Close damper. Loosen fasteners and adjust stop
angles so as to contact blade edge/blade seals.
Caulking failed Recaulk gaps with silicone sealant as required.
Excessive leakage through
damper frame
No axle seals specified Contact manufacturer for available modifications.
O-ring axle seals worn Replace o-rings as required.
Double gland packing not tight Tighten adjustment nuts on double gland stuffing
box.
Double gland packing worn Replace packing as required.
• HTD Series Rev. 3 July 2020 Copyright 2020 © Greenheck Fan Corporation
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications without
notice.
Specific Greenheck product warranties can be located on greenheck.com within the product area tabs and listed in the
Library under Warranties.
®
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