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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 electric/pneumatic 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.
Copyright © 2006 Greenheck Fan Corporation
461868 FSDR-XXX Rev. 7 March 2006
Symptom Possible Cause Corrective Action
Frame is out of round causing Adjust frame such that it is round
blades to bind on jamb seals
Actuator linkage loose Close damper, disconnect power, adjust
and tighten linkage
Defective motor Replace
Screws in damper linkage Locate screws and remove
Actuator linkage hitting wall or floor Damper installed too far into wall. Move
out to line designated on damper label.
Contaminants on damper Clean with a non-oil-based solvent
(see Damper Maintenance)
Damper does not
fully open and/or
fully close
Damper does not
operate
Actuator runs hot or
makes a humming
noise
Link separated
Heat Replace link
Actuator prohibited from reaching
end of stroke
Disconnect linkage from jackshaft,
open damper, power actuator to end of
spring, tighten linkage. Verify amp draw.
RRL, or TOR sensor
tripped
Heat
No power supplied to the actuator
Push reset button located on backside
of RRL or TOR.
Damper Trouble Shooting
The following is a possible cause and correction list for common concerns with the dampers.
Round duct connections to shall be attached with #8 sheet metal screws as follows:
• Ducts 22 in. dia. and smaller shall have three screws.
• Ducts larger than 22 in. dia. up to and including 24 in. dia. shall have five screws.
NOTE: All breakaway connections described may have duct sealant, PA2084T duct sealant adhesive manufactured by
Precision, DP1010 water base duct sealant manufactured by Design Polymetrics, or Grey Pookie applied in accordance
with SMACNA recommendations.
9. Round Duct Connections