Greenheck HB Series (469620) - Manual

Document number 469620
HB series
The following instructions should be followed when trying to adjust counterbalance weights on HB series
dampers. This is not intended to be used to modification for use as pressure relief damper.
counterbalance on one (linkage) side of damper.
Dampers with two sections will have linkage on both
sides of damper assembly. Arms are usually mounted
on every other axle, starting at the bottom, until the
magnitude of the counterbalance requires arms on every
axle. The steel airfoil models HB-230 and HB-330 will
require more counterbalance weights than model HB-120
with single thickness blade or models HB-110 and HB-
240 with aluminum blades. The longer arms are angled
so they will nest when installed on every axle. Greenheck
policy is to distribute counterbalance evenly among
blades to minimize linkage loading and to improve blade
closure.
This manual is the property of the owner, and is required for future maintenance. Please leave it with the
owner when the job is complete.
Receiving anD HanDling
Upon receiving dampers, check for both obvious
and hidden damage. If damage is found, record all
necessary information on the bill of lading and file
a claim with the final carrier. Check to be sure that
all parts of the shipment, including accessories, are
accounted for.
Dampers must be kept dry and clean. Indoor
storage and protection from dirt, dust and the
weather is highly recommended. Do not store at
temperatures in excess of 100°F(37ºC).
Safety WaRning:
improper installation, adjustment, alteration,
service or maintenance can cause property
damage, injury or death. Read the installation,
operating, and maintenance instructions
thoroughly before installing or servicing this
equipment.
Due to continuing research, Greenheck reserves the right to change specifications without notice.
Heavy Duty/Industrial backdraft damper are adjusted
for the specified flow direction at the factory. The
external counterbalance is adjusted for “easy operation”.
These instructions address adjustment of the blade
counterbalance for the following:
• Damper mounting orientation and/or flow direction has
changed in the field
• Damper requires excessive start-open pressure or does
not close
• Blade seal has been removed in the field
• Counterbalance settings have been erroneously
“adjusted” in the field
Single section wide dampers will have external blade
instructions
installation, Operation, and Maintenance instructions
®