Braeburn Systems LLC Static Pressure Adjustable Dampers Instructions
- October 30, 2023
- Braeburn Systems LLC
Table of Contents
Braeburn Systems LLC Static Pressure Adjustable Dampers
Static Pressure Adjustable Dampers
The Static Pressure Adjustable Damper is a single-blade, counterbalancing spring damper that operates on air pressure to control the flow of by-pass air on a zoned system. The damper utilizes an adjustable knob/blade to maintain the correct amount of pressure in the duct system. The damper allows for setpoints between 0.3 inches W.C. of pressure to 0.8-inch W.C. It is available in round sizes only.
Available Sizes and CFM Capacities
| Round Sizes | Size (Diameter) | CFM |
|---|---|---|
| 8 | 400 | |
| 10 | 750 | |
| 12 | 1,000 | |
| 14 | 1,600 |
Calculating By-Pass Air Requirements
The need for by-pass air and the size of the damper required can be calculated by knowing the total CFM capacity of the HVAC unit (TCFM) and subtracting the CFM capacity of the smallest zone (SCFM). The resulting CFM of air required to be by-passed (BCFM) is used to select an appropriately sized by-pass damper from the chart above. It is recommended to have a larger size by-pass than having one that is too small.
Location
Selecting a location to place the static pressure damper is very important for overall system operation. Ideally, the best place for the damper is as far away from the air handler as possible and before any zone dampers. In an extended plenum application where zones come off the side of the main trunk, the end of the extended plenum is the ideal situation. In most residential applications, however, the zone dampers are right at the plenum of the air handler. In this application, the only location for the bypass damper is at the plenum. It is recommended that a freeze protection device be used as well as the supply air sensors with the zoning panel to protect the equipment from overheating or cooling due to the return by-pass.
Product Usage Instructions
-
Calculate the by-pass air requirements by subtracting the smallest zone CFM from the total CFM capacity of the HVAC unit.
-
Refer to the chart above and select an appropriately sized bypass damper.
-
Install the damper in an appropriate location, ideally as far away from the air handler as possible and before any zone dampers.
-
Maintain the correct amount of pressure in the duct system by
adjusting the knob/blade on the damper. -
Use a freeze protection device and supply air sensors with the
zoning panel to protect the equipment from overheating or cooling due to the return bypass.
INSTALLATION INSTRUCTION
The Static Pressure Adjustable Damper is a single-blade, counterbalancing
spring damper, that operates on air pressure in order to control the flow of
by-pass air on a zoned system. The damper utilizes an adjustable knob/blade to
maintain the correct amount of pressure in the duct system. The damper allows
for setpoints between 0.3 inches W.C. of pressure to 0.8 inches W.C. As zone
dampers close off the air to several zones, the supply air pressure in the
duct system will increase. This increase in air pressure can increase the
noise level and reduce the flow of conditioned air through the HVAC Unit. The
static pressure adjustable damper works similarly to a standard bypass damper
in that it helps maintain constant air pressure in the duct system.
However, the damper utilizes minimum setpoints for the blade to respond to air
pressure. This reduces the buildup of pressure within the supply and helps
reduce the noise that is caused by these high air pressures and velocities, as
well as maintains a constant volume of air (CFM) through the duct system.
Maintaining a constant volume of air through the HVAC System keeps the
efficiency of the system at its maximum.
The static pressure adjustable damper is available in round sizes only. The
chart below lists the available sizes of dampers and their recommended CFM
capacities.
Round Sizes
- Size (Diameter) CFM Size (Diameter) CFM
- 8” 400 12” 1,000
- 10” 750 14” 1,600
Calculating By-Pass Air Requirements
- Determining the need for by-pass air and the size of the damper required is very simple. It can be calculated by knowing the total CFM capacity of the HVAC unit (TCFM) and subtracting the CFM capacity of the smallest zone (SCFM) will equal the CFM of air required to be bypassed (BCFM).
- TCFM – SCFM = BCFM
- Total CFM Smallest Zone CFM By-Pass CFM
- Once the by-pass amount of air is known, use the chart above to select an appropriately sized by-pass damper. It is always recommended to have a larger size by-pass than having one that is too small. It is much easier to reduce by-pass air through the damper or close it off than having to increase the size of the by-pass duct and/or damper.
Location
- Selecting a location to place the static pressure damper is very important for overall system operation. Ideally the best place for the damper is as far away from the air handler as possible and before any zone dampers. In an extended plenum application where zones come of the side of the main trunk, the end of the extended plenum is the ideal situation.
- In most residential applications, however, the zone dampers are right at the plenum of the air handler. In this application the only location for the bypass damper is at the plenum. In this application, especially when the bypass damper is ducted to the return, it is recommended that a freeze protection device be used as well as the supply air sensors with the zoning panel to protect the equipment from overheating or cooling due to the return by-pass.
Installation
- The static pressure adjustable dampers are easily installed in-line of any round duct, with the blade already enclosed in a 10” length of duct. The damper is just like any typical length of round rigid duct, with a crimped end in the direction of the air flow.
- Place the flat collar end of the damper over the crimped end of the take-off or rigid metal duct. Insert crimped end of round damper into un-crimped end of rigid round duct and secure with sheet metal screws. When using flexible duct, slip duct over end of the round damper and secure with duct straps (not provided).
- Most damper installations are typically in horizontal ducts where the damper control blade will close vertically. The damper can also be installed in vertical ducts.
- To adjust the static pressure control damper, all zone dampers must first be open and the fan operating. When all dampers are open, the knob to the damper should be positioned in the desired minimum setpoint for pressure. Air will flow past the blade, limiting the buildup of pressure within the supply plenum.
- This ultimately will result in less noise normally caused by the damper blade constantly moving.
Gear Specifications
- Dimensions – 4.725” x 4.725” x 1.25”
- Temperature Rating – 0°F to 180°F Operating, -20°F to 190°F Storage
- Humidity – 5% to 95% Non-Condensing
- Static Pressure – Maximum 0.8” W.C
- ©2023 Braeburn Systems LLC
- 2215 Cornell Ave., Montgomery IL 60538
- Telephone 866.268.5599
- Fax 866.268.8897
- www.braeburnonline.com
Documents / Resources
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Braeburn Systems LLC Static Pressure Adjustable
Dampers
[pdf] Instructions
Static Pressure Adjustable Dampers, Pressure Adjustable Dampers, Adjustable
Dampers, Dampers
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References
Read User Manual Online (PDF format)
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