Greenheck AMD-42 User Manual

AMD-42

Air Measuring Station with

Application and Design

The AMD-42 combines the functionality of an accurate airflow measuring station and an ultra low leakage control damper into
one compact assembly that both measures and regulates airflow volumes to a target set-point. The AMD-42 comes standard
with a modulating actuator and a properly sized pressure transducer that output a signal proportional to cfm. A field supplied
controller can then use the transducer's signal along with the flow formula: CFM = Area * K * (P
modulating actuator to the target set-point. K & m are factory supplied variables specific to each damper. The AMD-42 is also
available with a factory supplied LON controller that accepts a target flow set-point as an input (either analog or digital) and
then positions the damper to achieve that set-point.

Ratings

Velocity: 300 to 2000 fpm (1.5 - 10.2 m/s)

Leakage: 6 cfm/ft
3 cfm/ft2 @ 1 in. wg (55cmh/m2 @ .25 kPa)
Temperature: -20°F to 180°F (-29°C to 82ºC) Consult factory
for temperature lower than -20°F (-29°C)
Monitor Accuracy: 5% of reading

Construction Standard Optional

Frame Material Galvanized Steel -

Frame Material
Thickness

Frame Type 5 in. x 1 in. hat channel -

Blade Material Extruded Aluminum -

Blade Type Airfoil -

Blade Action Parallel

Linkage Plated steel out of airstream, concealed in jamb

Axle Bearings Synthetic (acetal)

Axle Material Plated steel 304SS

Blade Seals TPE Silicone

Jamb Seals 304SS -

Sleeve 12 in.

Sleeve Gauge 20 ga. 14 ga. or 16 ga.

Flange None 1 1/2 in. (38mm);

Air Straightener Polycarbonate

Actuator 24VAC 50/60 Hz 24VAC w/ auxiliary

2

@ 4 in. wg (110 cmh/m2 @ 1 kPa)

16 ga. (1.5mm) 12 ga.

14 ga.

Bronze, 304SS

sleeve type

12 in. - 48 in.

(305mm)

Honeycomb

(305mm - 1219mm)

Upstream side,

Downstream side,

Both Sides

-

switches or manual

quadrant

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

Blade Overlap

Blades overlap to provide
added resistance to
leakage. When pressure
increases, the blade seals
are forced together creating
a tighter seal.

Features & Control Options

• 24VACmodulatingactuatormountedexternallyor

internally (NEMA 2)

•Factorysupplied0-10VDCpressuretransducer

•OptionalfactorysuppliedLONcontroller(0-10VDC,
2-10VDC,or4-20mA)

VCD-42 Control Damper

transducer

)m to regulate the

W x H

Inches 6 x 6 12 x 8 48 x 74 144 x 74

mm 152 x 152 305 x 203 1219 x 1880 3658 x 1880

* For sizes larger than listed, consult factory.

Minimum Size Maximum Size

External Internal Single Section Multiple Section*

Installation instructions available at www.greenheck.com

AMD-42 Mounting Styles and Specifications