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, do not use oil-based lubricants
or any other lubricants that attract contaminants such as dust.
Dampers must be maintained, cycled, and tested at intervals not less than every six months and in accordance with the
latest editions of NFPA 90A & 92A, UL864 and local codes.
Copyright © 2006 Greenheck Fan Corporation
462721 DFDR-XXX FS Rev. 4 December 2006
Damper troubleshooting
The following is a possible cause and correction list for common concerns with the dampers.
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Fig. 4
4
DFDR-XXX Blade orientation
Normal
30° Off Horizontal
(Maximum)
30° Off Horizontal
(Maximum)
Axle
Axle
Axle
30°
30°
Round duct connections shall be attached
with #8 sheet metal screws as follows:
• Ducts 22 in. (559mm) dia. and smaller shall have three
screws.
• Ducts larger than 22 in. (559mm) dia. and up to
including 24 in. dia. shall have five screws.
Note:
All breakaway connections described may
have duct sealant, PA2084T Duct Sealant Adhesive
manufactured by Precision or DP1010 Water Base Duct
Sealant manufactured by Design Polymetrics, applied
in accordance with SMACNA recommendations.
6. Round Duct Connections
Symptom
Possible Cause
Corrective Action
Damper does not fully open and/or fully
close
Frame is out of round causing blades to
interfere with frame
Adjust frame such that it is round
Screws interfere with blade
Locate screws and remove
Contaminants on damper
Clean with a non-oil based solvent (see
Damper Maintenance)
Link separated
Heat
Replace link
