Greenheck HBS Series (474916) - Manual (Page 6)

Damper Troubleshooting
Problem Possible Cause Solution
Damper does not move
Damper linkage failed Inspect damper for failed clevis pins, clevises, or
crankarms and replace as necessary.
Obstruction in damper linkage
or inside duct Inspect for projecting mounting bolts, debris inside
damper and remove.
Damper attempts to
move but does not open
fully
Obstruction in damper linkage
or inside duct Inspect for projecting mounting bolts, debris inside
damper and remove.
Damper linkage modified in the
field Readjust linkage so blade rotates fully open and
closed.
Linkage pivots failed Replace linkage bars, clevises and pins as required.
High noise level
Very high velocity/flow Reduce flow through damper.
Damper not closing fully Readjust drive linkage to fully close damper.
The following is a cause and correction list for common concerns with the damper:
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474916• HBS Series Rev. 3, January 2015 Copyright 2015 © 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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