Greenheck DFD Series Installation, Operation And Maintenance Manual page 38

Damper Maintenance
Greenheck's dampers are designed to be trouble free and hassle free under normal operation. Dampers are to
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 moli-spray oil or similar graphite based oil as regular lubricating oil
will attract dirt.
Bearings: Synthetic, oil impregnated, and ball bearings (without grease fittings) do not require
lubrication. Ball bearings with grease fittings require only minimal grease.
Closure Remove foreign materials that may be interfering with blade closure or effective sealing of the
blades with each other or with the frame.
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.
Troubleshooting
The following is a cause and correction list for common concerns with the dampers.
Symptom
Damper does not fully open
and/or fully close
Actuator runs hot or makes a
humming noise
Our Commitment
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications
without notice.
Product warranties can be found online at Greenheck.com, either on the specific product page or in the literature
section of the website at Greenheck.com/Resources/Library/Literature.
Phone: 715.359.6171 • Fax: 715.355.2399 • Parts: 800.355.5354 • E-mail: gfcinfo@greenheck.com • Website: www.greenheck.com
6 463384 • VCD FBH FBV Series, Rev. 15, January 2020
Possible Cause
Frame is 'racked' causing blades
to bind on jamb seals
Actuator linkage loose
Defective motor
Screws in damper linkage
Actuator linkage hitting wall or
floor
Contaminants on damper
Actuator prohibited from reaching
end of stroke
Corrective Action
Adjust frame such that it is square and
plumb
Close damper, disconnect power, adjust
and tighten linkage
Replace
Locate screws and remove
Damper installed too far into wall. Move
out to line designated on damper label
Clean with a non oil-based solvent (see
Damper Maintenance)
Disconnect linkage from jackshaft,
open damper, power actuator to end of
spring, tighten linkage. Verify amp draw
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