GREENHECK VCD-20 Control Damper 3V Blade Instruction Manual

VCD-20
Control Damper – 3V Blade

*W & H dimension furnished approximately 1⁄4 in. (6mm) undersize.

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)
Pres s ure
Up to 5 in. wg (1.2 kPa) – pressure differential
Temperature
-40°F to 250°F (-40°C to 121°C). Consult 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 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.

Blade Operation

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 available. Factory supplied actuators are sized for 1500 fpm (7m/s) and fully closed differential pressure of 2 in. wg (.5 kPa). contact 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 exceeds the damper’s cataloged velocity.
• Blades must be horizontal for either horizontal or vertical mount. If you need vertical blades, see VCD-23V model.

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

* Shown with optional internally mounted actuator.

Document Links

https://content.greenheck.com/public/DAMProd/Original/10001/463384vcdfbhfbv_iom.pdf
Specifications| Damper Selection Guide
|
https://content.greenheck.com/public/DAMProd/Original/10003/VCD2xVCD3xVCD- 42Series_spec.rtf| https://content.greenheck.com/public/DAMProd/Original/10002/InteractiveDamperSelectionGuide.pdf

Warrantyhttps://content.greenheck.com/public/DAMProd/Original/10002/damper_warranty.pdf

AMCA Certified Pressure Drop Datahttps://l.ead.me/bd0hEe

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 in accordance with 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)

24 in. x 24 in. (610mm x 610mm)

36 in. x 36 in. (914mm x 914mm)

48 in. x 12 in. (1219mm x 305mm)

12 in. x 48 in. (305mm x 1219mm)

AMCA 5.3 12 in. x 12 in. (305mm x 305mm)

24 in. x 24 in. (610mm x 610mm)

36 in. x 36 in. (914mm x 914mm)

48 in. x 12 in. (1219mm x 305mm)

12 in. x 48 in. (305mm x 1219mm)

AMCA 5.5
12 in. x 12 in. (305mm x 305mm)

24 in. x 24 in. (610mm x 610mm)

36 in. x 36 in. (914mm x 914mm)

48 in. x 12 in. (1219mm x 305mm)

12 in. x 48 in. (305mm x 1219mm)

Leakage Data

Leakage testing was conducted in accordance with 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/ft 3(1.204 kg/m3).

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.

Mounting

• External – includes extension pin (standoff bracket optional)
• External kit – actuator and all mounting hardware
• Internal – blade lever

in (136.5 mm)
EFB & EFCX Series| 8 1⁄2  in (216 mm)| 6 in (152mm)| 8 1⁄2  in (216 mm)

This drawing depicts the worse case clearance requirements for an actuator with a jackshaft.

Multi-Section Dampers

Dampers larger than the maximum single section size, will be made up of a multiple of equal size sections. Multiple section dampers can be jackshafted together so that all sections operate together as shown below.
NOTE: Dampers larger than 48 in. x 74 in. (1219mm x 1880mm) are not intended to be structurally self supporting.
Additional horizontal bracing is recommended to support the weight of the damper and vertical bracing should be installed as required to hold against system pressure.
Refer to IOM document 463384 for structural support requirements on multi- section assemblies.     

Copyright ® 2023 Greenheck Fan Corporation
VCD-20 R23, April 2023
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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