Document Number 469420
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BR series Counterweight Adjustments
Installation, Operation, and Maintenance Instructions
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.
Pre-Installation Guidelines
The basic intent of a proper installation is to secure the damper into the opening in such
a manner as to prevent distortion and disruption of damper operation. The following
items will aid in completing the damper installation in a timely and effective manner.
1) Check the schedules for proper damper locations within the building. Visually inspect
the damper for damage.
2) Lift or handle damper using sleeve or frame. Do not lift damper using blades or
linkage. When handling multiple sections assemblies, use sufficient support to evenly
lift at each section mullion (see Figure 1). Do not drag, step on, apply excessive
bending, twisting, or racking.
3) Do not install screws in damper frame that will interfere with damper blades and
prevent them from opening and/or closing.
4) Damper must be installed into duct or opening square and free of twist or other
misalignment. Damper must not be squeezed or stretched into duct or opening. Out
of square, racked, twisted or misaligned installations can cause excessive leakage
and/or prevent free operation.
5) Damper must be kept clean, dry and protected from dirt, dust and other foreign materials prior to and after installation.
Examples of such foreign materials include but are not limited to:
a) Drywall/mortar dust
b) Firesafing materials
6) Damper should be sufficiently covered as to prevent overspray if wall texturing or spray painting will be performed
within 5 feet (1.50m) of the damper.
c) Wall texture
d) Paint overspray
Figure 1- supports for lifting a
multi-section damper
Multi section dampers
Spreader Ba
Attachments
Pre-Installation Guidelines continued....
Assembly
7) ACCESS: Suitable access must be provided for damper inspection and servicing. Where it is not possible to achieve
sufficient size access, it will be necessary to install a removable section of duct.
Counterweight Adjustment Procedure for BR Models
Dampers are shipped from the factory with frame flange location and flow direction as ordered. Location and size of both
counterbalances (blade edge, adjustable blade weights) are dependent upon flow direction and damper size. The damper
must be mounted square and plumb and must operate freely before any weight adjustments are performed. Contact
Greenheck for required modifications to change flow directions.
The following instructions should be followed when attempting to adjust counterweights on the BR series damper. Figure
1, 1A, & 1B shows the typical location of the adjustable counterweight assembly. Depending on the size of the damper and
specified start open pressure, the damper may have more than one counterweight assembly.
Adjustable
Counterweight
Assembly
Adjustable
Counterweight
Figure 1
BR-1x series
Airflow
Assembly
Airflow
Airflow
Figure 1A
BR-3x series
Figure 1B
BR-4x series
Adjustable
Counterweight
Counterbalance Adjustment for BR-1X Series: Horizontal mount - Vertical Up Airflow
Figures 2 & 3 show the components of a typical adjustable counterweight assembly. BR-1X series
damper with a short height may have a different style blade and a trimmed mounting bracket. The
adjustment procedure is the same for both styles of blades.
The blade edge counterweight (Figure 3) is factory set and not intended for field adjustment. For
vertical up airflow, all adjustments should be made in the adjustable counterweight assembly.
When adjusting the counterbalance weights, you will need to adjust the full open pressure and start
open pressure. Both steps will need to be done.
Adjusting Full Open Pressure and Closing Force
Adjusting the closing force will also affect the full open pressure. Figure 3 shows the blade in the full
open position. Additional weights can be added to increase the closing force. Removal or trimming
of weights will reduce the closing force. After adjustment, verify blades close under no airflow from
the full open position. Increase the closing force if the blades fail to close.
Adjusting Start Open Pressure
When the blades are in the closed position, the adjustable weights are used for the start open pressure of the damper.
Sliding the weights toward the blade seal will increase the start open pressure and sliding the weights toward the blade edge
counterweight will decrease pressure (Figure 4).
Figure 2 Adjustable
counterweight assembly
Counterbalance Adjustment for BR-1X Series: Horizontal mount - Vertical Up Airflow
Damper
Increases Closing
Force
Decreases Closing
Force
Bottom of
Bracket
cont.......
Blade
Counterweight
Adjustment
Bracket
Increases Start
Open Pressure
Decreases Start
Open Pressure
Counterbalance
Weights
Figure 4: Counterweight adjustment for start open pressure. Blade is shown in
full close position
If sliding the weights to the furthest left position (toward the blade seal) does not provide a high
enough start open pressure, additional weights can be added. In this case, the closing force will
also increase.
Dampers are factory adjusted to the start open pressure, based upon your order, for the specified
flow direction. Typically, a minimum of one weight plate will be used to keep blades closed,
although only the mounting bracket may be sufficient for small damper sizes. Consult factory for
Blade Edge
Counterweight
Figure 3 - Adjustable
counterweight assembly
detail
plate quantity and sizing if an elevated start open pressure is required.
Final Adjustment Check
After adjusting the counterweights, verify that no interference occurs between the counterweights and the adjacent blades.
If any interference, adjust counterweights. Also verify that the damper blades close under no airflow from the full open, 1/2
open, and 1/4 open positions. If blades do not close, adjust weights as required.
Counterbalance Adjustment for BR-3X Series: Vertical mount - Horizontal Airflow
Figure 5 details the components of a typical adjustable counterweight assembly. Dampers
with a short height may have a different style blade and a trimmed mounting bracket. The
adjustment procedure is the same for both styles of blades.
The blade edge counterweight (Figure 5) is factory set and not intended for field adjustment.
For horizontal airflow, all adjustments should be made in the adjustable counterweight
assembly.
When adjusting the counterbalance weights, you will need to adjust the full open pressure and
start open pressure. Both steps will need to be done.
Adjusting Start Open Pressure
Counterbalance
Weights
Counterweight
Adjustment bracket
When the blades are in the closed position (Figure 5), the adjustable weight are used for
the start open pressure of the damper. Additional weights can be added to increase start
open pressure and removal or trimming of weights will reduce start open pressure. After
adjustment, verify blades close under no airflow from the 1/4 open position. If the blades fail
Figure 5 - Adjustable
counterweight assembly detail
to close, additional weight is required.
Figure 6: Counterweight adjustment in the full open position
Adjusting Full Open Pressure and Closing Force
Adjusting the closing force will also affect the full open pressure. Figure 6 shows the blade in the full open position. If blades
hang open or more closing force is desired, slide weights toward the bottom of the bracket (Figure 6). If the blades close too
fast or less closing force is desired, move weights toward the top of the bracket (Figure 6).
Dampers are factory adjusted to the start open pressure, based upon your order, for the specified flow direction. Typically,
a minimum of one weight plate will be used to keep blades closed, although only the mounting bracket may be sufficient for
small damper sizes. Consult factory for plate quantity and sizing if an elevated start open pressure is required.
Final Adjustment Check
After adjusting the counterweights, verify that no interference occurs between the counterweights and the adjacent blades.
If any interference, adjust counterweights. Also verify that the damper blades close under no airflow from the full open, 1/2
open, and 1/4 open positions. If blades do not close, adjust weights as required.
Blade Edge
Counterweight
Damper Blade
Counterbalance Adjustment for BR-4X Series: Horizontal mount - Vertical Down
Blade Edge
Blade Edge
Counterweight
Counterweight
Adjustment
Bracket
Airflow
Figure 7 details the components of a typical adjustable counterweight assembly. Dampers
with a short height may have a different style blade and a trimmed mounting bracket. The
Counterweight
Adjustment
Bracket
adjustment procedure is the same for both styles of blades.
The blade edge counterweight (Figure 7) is factory set for the specified start open pressure.
For vertical down airflow, minor adjustments can be made in the adjustable counterweight
assembly. If the desired change is greater than the capability of the adjustable
counterweight assembly, then changes to the blade edge weight would be required.
Consult factory for assistance in adjusting blade edge weight.
When adjusting the counterbalance weights, you will need to adjust the full open pressure
and start open pressure. Both steps will need to be done.
Counterbalance
Weights
Adjusting Full Open Pressure and Closing Force
Adjusting the closing force will also affect the full open pressure. Figure 7 shows the blade
in the full open position. Additional weights can be added to increase the closing force.
Removal or trimming of weights will reduce the closing force. After adjustment, verify
blades close under no airflow from the full open position. Increase the closing force if the
Figure 7 - Adjustable counterweight
assembly detail
blades fail to close.
Adjusting Start Open Pressure
When the blades are in the closed position, the adjustable weights are used for the start open pressure of the damper. Sliding
the weights toward the blade edge counterweight will increase the start open pressure and sliding the weights toward the
blade seal will decrease pressure (Figure 8).
Counterweight
Increases
Open Pressure
Figure 8: Counterweight adjustment for start open pressure.
Blade is shown in full close position.
Decreases
Open Pressure
If sliding the weights to the furthest left position (toward the blade edge counterweight) does not provide a high enough start
open pressure, additional weight to the blade edge counterweight would be required. Consult factory with desired start open
pressure.
Dampers are factory adjusted to the start open pressure, based upon your order, for the specified flow direction. Typically,
a minimum of one weight plate will be used to keep blades closed, although only the mounting bracket may be sufficient for
small damper sizes. Consult factory if an elevated start open pressure is required.
Final Adjustment Check
After adjusting the counterweights, verify that no interference occurs between the counterweights and the adjacent blades.
If any interference, adjust counterweights. Also verify that the damper blades close under no airflow from the full open, 1/2
open, and 1/4 open positions. If blades do not close, adjust weights as required.
Our Commitment
As a result of our commitment to continuous improvement, Greenheck reserves the right to change
specications without notice.
Specic Greenheck product warranties are located on greenheck.com within the product area tabs and in
the Library under Warranties.
®
Phone: (715) 359-6171 • Fax: (715) 355-2399 • E-mail: gfcinfo@greenheck.com • Website: www.greenheck.com
469420• BR Series Rev. 2, October 2012 Copyright 2012 © Greenheck Fan Corporation
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