Copyright © 2008 Greenheck Fan Corporation
461337 OFSD ODFD Rev 9 January 2008
Damper Troubleshooting
The following is a possible cause and correction list for common concerns with the dampers.
Symptom
Possible Cause
Corrective Action
Damper does not
fully open and/or
close
Frame is 'racked' causing blades
to bind on jamb seals
Adjust frame such that it is square and plumb
Actuator linkage loose
Close damper, disconnect power, adjust and
tighten linkage
Defective motor
Replace
Screws in damper linkage
Damper installed too far into wall. Move out
to line as designated on damper label
Contaminants on damper
Clean with a non-oil based solvent (see
Damper Maintenance)
RRL or TOR sensor
tripped
Heat
Push reset button located on backside of
RRL or TOR
Damper does not
operate
No power supplied to the actuator
Add power supply
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 a minimum in accordance with:
• The latest editions of NFPA 80, 90A, 92A, 92B, 101, 105, UL864, AMCA 503-03 and local codes.
• Actuator manufacturer recommendations.
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