ACD-56 - NCA Manufacturing

MODEL ACD-56
AIRFOIL PARALLEL OR OPPOSED BLADE DAMPER
LOW LEAKAGE: TESTED TO AMCA 500
ACD-56 - 02-05
Standard Construction:
Frame: Extruded aluminum hat section, 5"w x 1"h
Blades:
Bearings:
Axles:
Linkage:
Extended Shaft:
Blade Seals:
Jamb Seals:
Finish:
Jackshaft:
Minimum Damper Size:
Maximum Damper Size:
Options:
Operators:
Finish:
Face & Bypass:
Jackshaft:
Bearings:
(127 mm x 25 mm) heavy gauge 6063-T5.
Extruded aluminum 6" (152 mm) wide
airfoil profile, heavy gauge 6063-T5
extrusion.
Nylon, press fit into frame.
Square plated steel.
Galvanized steel linkage bar,
concealed in frame.
Removable, 6" long x 1/2” dia.
(152 mm x 12.7 mm) plated steel
coupled to square axle.
Inflatable, pressure sensitive.
Flexible metal, pressure sensitive.
Mill.
1/2" (12.7 mm) diameter standard on
multi sections up to 96"h x 72”w (2438 mm x 1829 mm).
Single Blade 6"w x 5"h (152 mm x 127 mm).
Single Section: 60"w x 72"h (1524 mm x 1829 mm),
Multi Section: Unlimited.
5"
(127 mm)
Motor mounting - Factory furnished
or by others.
Manual quadrant or Chain operator
Painted Finishes
Clear Anodize - 204-R1 & 215-R1
Integral Color Anodize
Right angle and straight line face
and bypass
3/4" (19 mm) Jackshaft reinforcement
Bronze oilite bearings.
Notes: • Dampers fabricated 1/4"
(6.4 mm) under opening size
unless otherwise noted
• All dimensions in ( ) indicate millimeters
• Specify parallel or opposed blade action.
5-3/4"
(146 mm)
Suggested Specification
Opposed
Blade
6"
(152 mm)
3-7/8"
(98 mm)
6"
(152 mm)
Parallel
Blade
Features
The ACD-56 series
Control dampers have
been designed and tested
to provide the ultimate in
performance features for
sophisticated HVAC
systems. Streamlined
("airfoil") blades provide
reduced turbulence and
noise. Inflatable blade
edge and jamb seals
allow extremely tight
seating without unduly
increasing torque
requirements.
5"
(127 mm)
Low Profile
(Damper 16" High or Less)
(406 mm)
Low leakage Control dampers shall be Model: ACD-56 by NCA Manufacturing. Damper blades shall be of aluminum streamline
("airfoil") construction for minimum pressure drop. Both blade edge and jamb seals shall be of the pressure sensitive type
for low leakage. Dampers shall be rated for leakage and pressure drop to AMCA Standard 500. Leakage through a 48" x 48"
(1219 mm x 1219 mm) shall not exceed 2 cfm/sq/ ft. at 4.0" static pressure.
Specifications are correct at time of printing. However, as part of our ‘continuous improvement program,’ we reserve the right to make further improvements without notice.
© 1999 NCA Manufacturing
Project:
Location:
Architect:
Engineer:
Contractor:
Address:
P.O. Number:
Date:
NCA MANUFACTURING, INC. 1036 SOUTH JUPITER ROAD GARLAND, TEXAS 75042 TEL. 972-276-5002 FAX 972-276-6747

Pressure Drop – Damper Open 24" x 24" (610 mm x 610 mm)
1.0 (25.4)
0.9 (22.9)
0.8 (20.3)
0.7 (17.8)
0.6 (15.2)
MODEL ACD-56
AIRFOIL PARALLEL OR OPPOSED BLADE DAMPER
LOW LEAKAGE: TESTED TO AMCA 500
Performance Data Graphs
Air Leakage – Damper Closed 48" x 48" (1219 mm x 1219 mm)
8.0 (203.2)
7.0 (177.8)
6.0 (152.4)
0.5 (12.7)
5.0 (127)
0.4 (10.2)
4.0 (127)
Static Pressure Drop In Inches
and (Millimeters) of Water
0.3 (7.6)
0.2 (5.1)
0.15 (3.8)
0.1 (2.5)
Static Pressure In Inches
and (Millimeters) of Water
3.5 (88.9)
3.0 (76.2)
2.5 (63.5)
2.0 (50.8)
.08 (2.03)
1.0 (25.4)
.06 (1.5)
.05 (1.3)
.04 (1.0)
0.9 (22.9)
0.8 (20.3)
0.7 (17.8)
0.6 (15.2)
ACD-56 - 02-05
1000 1500 2000 3000 4000 5000 6000
(5.1) (7.6) (10.2) (15.2) (20.3) (25.4) (30.5)
Velocity
Tested as per AMCA Std. 500, Fig. 5.3 – Air velocity
shown in feet per minute and in ( ) meters per second.
1.0 1.5 2.0 2.5 3.0 4.0 5.0 6.0
Leakage
Tested as per AMCA Std. 500, Fig. 5.5 – leakage in CFM per sq. ft.
Typical Model
ACD-56 Installation
The ACD-56 series is not recommended
for vertical blades installation. Always
connect motors to power blade and on
linkage side.
The ACD-56 is suitable for applications
with total pressures up to 4.0" w.g. It may be used
in applications exceeding 4.0" w.g. by reducing
the damper width. For correct damper sizing
consult the factory when exceeding standard
design limit of 4.0" w.g.
The NCA frame is designed for easy
installation into duct. Simply put sheet
metal screws through the duct into the
1/2" (12.7 mm) wide mounting flanges
approximately 18" (457 mm) on center.
NCA dampers are designed to be self
supporting only in largest single section
size. Larger size may require external
bracing. Reco mmended bracing minimum
of 8' (2438 mm). The amount and size
will depend on unit size and system
pressure.
NCA MANUFACTURING, INC. 1036 SOUTH JUPITER ROAD GARLAND, TEXAS 75042 TEL. 972-276-5002 FAX 972-276-6747