Greenheck HPR Series Adjustment on Pressure Relief Dampers (469134) - Manual (Page 2)

Start-open pressure is adjusted by either changing
weight center distance from axle center line, or
by increasing or decreasing the quantity of plates
mounted to arms. In extreme cases, the arm length
and quantity must be changed. See table at the end of
procedure for replacement parts.
Adjust weight center distance first. Loosen fasteners
holding weight plates to arm and move inward or
outward in arm slot as required. Moving plates toward
axle will reduce start-open pressure; increasing the
center distance will increase the pressure at which
blades start to open. If a greater range of pressure set
adjustment is required, add or remove plates from arms
as required to obtain the required start-open pressure.
Check all fasteners for tightness.
Pressure Setting Procedure cont....
Components Applicable
Model Galvanized Part
Number Stainless Steel
Part Number
Axle adapter, 3/8” sq. to 3/4” OD, 3”
long HPR-120 458959 NA
Axle adapter, short, 3/4” OD HPR-120 370120 416343
3/4” crankarm All 653630 687738
3/8”-16 x 2 crankarm bolt All 415882 415924
3/8”-16 hex nut for crankarm All 415457 416168
Short counterweight arm (81/2”) All 647344 689404
Long counterweight arm (121/2”) All 657343 683951
3/8”-16 set screw for short/long arm All 415050 415763
3/8”-16 weld nut for short/long arm All 415127 415928
Counterweight plate, 11/4” x 31/2” All 653144 687637
Counterweight plate, 21/2” x 31/2” All 653143 687636
Counterweight plate, 31/2” x 31/2” All 653142 687635
Bolt, 1/4” - 20 x 11/4” All 415973 NA
Bolt, 1/4” - 20 x 11/2” All 415517 416103
Nut, 1/4” - 20 All 415455 415575
Table of Components
FLOW
DAMPER BLADE
Figure 2C Vertical Down Flow
469134• HPR Series Rev. 2, October 2012 Copyright 2012 © 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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