Greenheck Fan OFSD-XXX Series Manual De Usuario

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.

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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