Greenheck Heavy Duty Smoke Damper HSD-401 (464604) - Manual (Page 3)

Damper does not
fully open and/or fully
close
Damper does not
operate
Damper troubleshooting
The following is a possible cause and correction list for common concerns with the dampers.
Damper maintenance
Dampers do not typically require maintenance as long as they are kept dry and clean. If cleaning is necessary, use mild
detergents or solvents. If lubrication is desired for components such as axle bearings, jackshaft bearings, and jamb seals, do
not use oil-based lubricants or any other lubricants that attract contaminants such as dust.
Dampers and their actuator(s) must be maintained, cycled, and tested in accordance with:
• The latest editions of NFPA 80, 90A, 92A, UL864, and local codes.
• Actuator manufacturer recommendations.
symptom Possible Cause Corrective Action
Frame is ‘racked’ or not round causing Adjust frame such that it is square
blades to bind on jamb seals or frame and plumb or round where applicable
Actuator linkage loose Close damper, disconnect power, adjust
and tighten linkage
Defective motor Replace
Screws in damper linkage Locate screws and remove
Contaminants on damper Clean with a non-oil-based solvent
(see Damper Maintenance)
No power supplied to the actuator
464604• HSD Rev. 4, October 2012 Copyright 2012 © 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 are located on greenheck.com within the product area tabs and in
the Library under Warranties.
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