GREENHECK VCD-20 3V Blade Control Damper Owner’s Manual
- July 2, 2024
- GREENHECK
Table of Contents
- GREENHECK VCD-20 3V Blade Control Damper
- Product Information
- Product Usage Instructions
- Application
- Construction
- Blade Operation
- Options
- Document Links
- AMCA Certified Pressure Drop Data
- Leakage Data
- Space Envelopes
- Clearance Requirements
- Actuator Mounting
- Multi-Section Dampers
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
GREENHECK VCD-20 3V Blade Control Damper
Product Information
Specifications:
| Parameter | Details |
|---|---|
| Frame Material | Galvanized Steel (Standard), 304SS (Optional) |
| Frame Material Thickness | 16 ga. (1.5 mm) (Standard), 12 ga. (2.7 mm)* |
(Optional)
Blade Material| Galvanized steel (Standard), 304SS (Optional)
Blade Thickness| 16 ga. (1.5mm)
Blade Type| 3V
Blade Action| Opposed
Product Usage Instructions
Installation:
- Ensure the damper size meets the requirements of your system.
- Follow the provided installation guide for proper mounting.
- Use appropriate tools and hardware for secure installation.
Maintenance:
- Regularly inspect the damper for any signs of wear or damage.
- Clean the damper blades and frame as needed to maintain optimal performance.
Troubleshooting:
If the damper is not functioning correctly, check for obstructions in the
airflow path or any misalignment in the blades.
FAQ:
-
Q: What is the maximum pressure rating for the VCD-20 control damper?
A: The damper can handle pressures up to 5 in. wg (1.2 kPa). -
Q: What is the maximum velocity rating for the VCD-20 control damper?
A: The damper can handle velocities up to 3000 fpm (15.2 m/s).
Application
The VCD-20 series is a general-purpose control damper for applications as an automatic control or manual balancing damper with low to medium pressure and velocity systems.
Damper Ratings
Velocity
Up to 3000 fpm (15.2 m/s)
**Pressure **
Up to 5 in. wg (1.2 kPa) – pressure differential
**Temperature **
-40°F to 250°F (-40°C to 121°C). Consult the factory for temperatures.
Construction
| Standard | Optional | |
|---|---|---|
| Frame Material | Galvanized Steel | 304SS |
| Frame Material Thickness |
16 ga. (1.5 mm)
|
12 ga. (2.7 mm)*
Frame Type
|
5 in. x 1 in. hat channel
| Single flange, Reversed flange, Double flange
Blade Material| Galvanized steel| 304SS
Blade Thickness| 16 ga. (1.5mm)|
Blade Type| 3V| –
Blade Action| Opposed| Parallel
Linkage
| Plated steel out of the airstream, concealed in jamb|
316SS
Axle Bearings| Synthetic| 316SS
Axle Material| 1⁄2 in. dia. Plated steel| 316SS
Paint Finishes
|
Mill Finish
| Baked Enamel, Hi-Pro Polyester, Industrial Epoxy
*When 12 ga. frame is selected and the damper height is less than 17 inches, low profile top and bottom frame members are utilized. These low-profile frame members will be made from 16 ga. material.
Notes:
- Low profile head and sill are used on sizes less than 17 in. (432mm) high
- Linkage concealed in the frame
- Electric actuator and manual quadrant are available. Factory-supplied actuators are sized for 1500 fpm (7m/s) and fully closed differential pressure of 2 in. wg (.5 kPa). contact the factory for actuator sizing on applications exceeding those limits.
- In applications where airflow could be uneven, such as a discharge fan, it is imperative to verify that at no point the maximum velocity exceed the damper’s catalogued velocity.
- Blades must be horizontal for either horizontal or vertical mount. If you need vertical blades, see the VCD-23V model.
*W & H dimension furnished approximately 1⁄4 in. (6mm) undersize.
| W x H | Minimum Size | Maximum Size |
|---|---|---|
| Single Section | Multiple Section | |
| Inches | 6 x 6 | 48 x 74 |
| mm | 152 x 152 | 1219 x 1880 |
Blade Operation
Options
- Actuators (24V, 120V, manual, pull chain)
- Actuator mounting (external, external kit (field assembly), internal)
- Flanges
- Multi-section fastening
- NEMA enclosures (3, 4, 4X, 7)
- OCI (open or closed indicator)
- R Transition
- Retaining angles
- Security bars
- Sleeves
- Transformers
Document Links
AMCA Certified Pressure Drop Data
Greenheck Fan Corporation certifies that the model VCD-20 shown herein is licensed to bear the AMCA Seal. The ratings shown are based on tests and procedures performed under AMCA Publication 511 and comply with the requirements of the AMCA Certified Ratings Programs. The AMCA Certified Ratings Seal applies to Air Performance ratings.
AMCA 5.2
12 in. x 12 in. (305mm x 305mm)
Velocity (fpm)
| Pressure Drop (in. wg)
---|---
500| 0.01
1000| 0.05
1500| 0.11
2000| 0.19
2500| 0.29
3000| 0.41
3500| 0.55
4000| 0.72
24 in. x 24 in. (610mm x 610mm)
Velocity (fpm)
| Pressure Drop
(in. wg)
---|---
500| 0.01
1000| 0.03
1500| 0.06
2000| 0.10
2500| 0.16
3000| 0.23
3500| 0.30
4000| 0.40
36 in. x 36 in. (914mm x 914mm)
Velocity (fpm)
| Pressure Drop
(in. wg)
---|---
500| 0.01
1000| 0.02
1500| 0.05
2000| 0.09
2500| 0.14
3000| 0.19
3500| 0.27
4000| 0.35
12 in. x 48 in. (305mm x 1219mm)
Velocity (fpm)
| Pressure Drop
(in. wg)
---|---
500| 0.01
1000| 0.04
1500| 0.08
2000| 0.15
2500| 0.22
3000| 0.32
3500| 0.43
4000| 0.56
48 in. x 12 in. (1219mm x 305mm)
Velocity (fpm)
| Pressure Drop
(in. wg)
---|---
500| 0.01
1000| 0.03
1500| 0.07
2000| 0.12
2500| 0.18
3000| 0.26
3500| 0.36
4000| 0.47
AMCA 5.3
12 in. x 12 in. (305mm x 305mm)
Velocity (fpm)
| Pressure Drop (in. wg)
---|---
500| 0.01
1000| 0.03
1500| 0.08
2000| 0.13
2500| 0.20
3000| 0.29
3500| 0.40
4000| 0.51
24 in. x 24 in. (610mm x 610mm)
Velocity (fpm)
| Pressure Drop
(in. wg)
---|---
500| 0.01
1000| 0.02
1500| 0.04
2000| 0.07
2500| 0.11
3000| 0.16
3500| 0.21
4000| 0.28
36 in. x 36 in. (914mm x 914mm)
Velocity (fpm)
| Pressure Drop
(in. wg)
---|---
500| 0.01
1000| 0.02
1500| 0.03
2000| 0.06
2500| 0.09
3000| 0.13
3500| 0.19
4000| 0.25
12 in. x 48 in. (305mm x 1219mm)
Velocity (fpm)
| Pressure Drop
(in. wg)
---|---
500| 0.01
1000| 0.03
1500| 0.07
2000| 0.12
2500| 0.18
3000| 0.26
3500| 0.36
4000| 0.46
48 in. x 12 in. (1219mm x 305mm)
Velocity (fpm)
| Pressure Drop
(in. wg)
---|---
500| 0.01
1000| 0.03
1500| 0.06
2000| 0.10
2500| 0.16
3000| 0.22
3500| 0.30
4000| 0.39
AMCA 5.5
12 in. x 12 in. (305mm x 305mm)
Velocity (fpm)
| Pressure Drop (in. wg)
---|---
500| 0.03
1000| 0.13
1500| 0.30
2000| 0.53
2500| 0.82
3000| 1.19
3500| 1.62
4000| 2.10
24 in. x 24 in. (610mm x 610mm)
Velocity (fpm)
| Pressure Drop
(in. wg)
---|---
500| 0.03
1000| 0.12
1500| 0.26
2000| 0.47
2500| 0.75
3000| 1.04
3500| 1.41
4000| 1.90
36 in. x 36 in. (914mm x 914mm)
Velocity (fpm)
| Pressure Drop
(in. wg)
---|---
500| 0.02
1000| 0.10
1500| 0.22
2000| 0.40
2500| 0.62
3000| 0.90
3500| 1.23
4000| 1.62
12 in. x 48 in. (305mm x 1219mm)
Velocity (fpm)
| Pressure Drop
(in. wg)
---|---
500| 0.03
1000| 0.14
1500| 0.32
2000| 0.57
2500| 0.90
3000| 1.29
3500| 1.76
4000| 2.30
48 in. x 12 in. (1219mm x 305mm)
Velocity (fpm)
| Pressure Drop
(in. wg)
---|---
500| 0.03
1000| 0.12
1500| 0.28
2000| 0.49
2500| 0.77
3000| 1.12
3500| 1.53
4000| 2.01
Leakage Data
Leakage testing was conducted by AMCA Standard 500-D and is expressed as cfm/ft2 of damper face area. All data has been corrected to represent standard air at a density of 0.075 lb/ft3 (1.204 kg/m3).
VCD-20
Velocity Limitations
Space Envelopes
On dampers, less than 18 in. (457mm) high, actuators may also require clearances above and/or below the damper frame. “B” and “T” dimensions are worst-case clearance requirements for some dampers less than 18 in. (457mm) high. All damper sizes under 18 in. (457mm) high do not require these worst- case clearances. If space availability above or below the damper is limited, each damper size should be individually evaluated.
| Actuator Type/Model | Height | T | B | D |
|---|---|---|---|---|
| Inches (mm) | Inches (mm) |
AFBUP (-S) and FSNF Series, Belimo MSxx20 Series, Honeywell
| > 6 to <10| 0| 123⁄4| 6
> 10 to <18| 0| 2| 6
> 18| 0| 0| 10
FSLF, LF and TFB Series, Belimo| > 6 to <10| 0| 31⁄2| 6
> 10| 0| 0| 6
MSxx04 & MSxx09 Series, Honeywell| > 6 to <9| 0| 43⁄4| 6
> 9| 0| 0| 6
MS75xx Series, Honeywell
| > 6 to <10| 0| 123⁄4| 6
> 10 to <18| 0| 7| 6
> 18| 0| 0| 6
Clearance Requirements
This drawing depicts the worst-case clearance requirements for an actuator with a jackshaft.
Internal mount only
Actuator model
| A| B| C
---|---|---|---
All except – EFB & EFCX Series| 7 3⁄4 in
(197 mm)
| 3 3⁄4 in
(95 mm)
| 5 3⁄8 in
(136.5 mm)
EFB & EFCX Series| 8 1⁄2 in
(216 mm)
| 6 in (152mm)| 8 1⁄2 in
(216 mm)
Actuator Mounting
Actuators may be installed at the factory, shipped loose with the necessary linkage and brackets for mounting, or field supplied. For more detailed information on actuator mounting, click on the link below or scan the QR code.
Multi-Section Dampers
Dampers larger than the maximum single-section size will be made up of multiple equal-sized sections.
NOTE:
Dampers larger than 48 in. x 74 in. (1219mm x 1880mm) are not intended to be
structurally self-supporting. Refer to IOM document 463384 for structural
support requirements on multi-section assemblies.
Copyright ® 2024 Greenheck Fan Corporation
VCD-20 R25, March 2024 Greenheck Fan Corporation reserves the right to make
product changes without notice.
P.O. Box 410 • Schofield, WI 54476-0410 • 715.359.6171 • greenheck.com.
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