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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
• 24VACmodulatingactuatormountedexternallyor
internally (NEMA 2)
•Factorysupplied0-10VDCpressuretransducer
•OptionalfactorysuppliedLONcontroller(0-10VDC,
2-10VDC,or4-20mA)
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
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AMD-42 Mounting Styles and Specifications
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Wiring Diagram for Controller
Specifications
Control dampers meeting the following specifications shall
be installed where shown on plans as an air monitor
station integral to the minimum outside air damper. The air
measuring damper shall control the minimum amount of
outside air as recommended by ASHRAE Standard 62 or
California Title 24.
The air measuring damper shall consist of: 16 ga. (1.5mm)
galvanized steel hat channel frame with 5 in. (127mm)
depth; airfoil shaped, extruded aluminum blades (0.063
in. [1.6mm] thick) with metal blade to blade overlap (seal
to seal only contact is not acceptable). Axles shall be 1/2
in. (13mm) dia. plated steel turning in acetal bearings;
TPE blade seals for 250°F (121°C) maximum temperature;
flexible stainless steel jamb seals; and external (out of the
airstream) blade-to-blade linkage.
Damper leakage rating to be in compliance with the IECC
(International Energy Consumption Code) and not to
exceed 3 cfm/ft2 (55 cmh/m2) at 1 in. wg (249 Pa). Testing
and ratings to be in accordance with AMCA standard 500-D.
Basis of design is Greenheck model AMD-42.
Copyright © 2010 Greenheck Fan Corporation
AMD-42 Rev. 3 Nov 2010
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