Blodgett BR-10 Installation Manual

Document Number 469420

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

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