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Series-DDA-DDC
HVAC Direct Coupled Actuators - DDA & DDC, 17-70 in-lb Torque
- Direct-mount design clamps right onto 0.4″ or 0.5″ shafts - simplifies installation and reduces linkage complexity
- Visual travel indicator plus push-button manual override for clear feedback and manual operation when needed
- Magnetic-clutch overload protection and quiet operation (<45 dB) provide durability and minimal noise in HVAC-driven spaces
- Designed for 60,000 nominal cycles and operating range from -22 °F to 122 °F (-30 °C to 50 °C) - built for dependable service life
Series-DDA-DDC
From
SGD
315.88
Product Overview
- Angle of Rotation 95 °
- Direction of Rotation CW/CCW
- Electrical Connection Screw Terminal
- Enclosure Ratings IP40, NEMA Type 2
- Fits Shaft Diameter 0.4 in, 0.5 in
- Input Control Signal Two-Position, Floating
- Life Cycle 60000 Full Cycles
- Operating Temperature, Max 122 °F
- Operating Temperature, Min -22 °F
- Overload Protection Magnetic Clutch
- Series ID Series-DDA-DDC
- Sound Output <45 dB
- Standard Accessories (2) imitative baffles, (2) baffle setscrews, (1) actuator body setscrew, and (1) aluminum gasket
- Standard Features Position Indication: Visual Indicator ; Auto/Manual Function: Push Button
- Wire Gauge 18 AWG
Supported Applications
The Dwyer Series DDA and DDC Direct Coupled Actuators are non-spring return actuators designed for the positioning of dampers and valves in HVAC systems. The series is engineered to accept specific control signals depending on the model family: DDA models utilize two-position, floating control inputs, while DDC models accept modulating 4-20 mA or 0-10 VDC control signals.
Operating Conditions & Performance
The series operates within an ambient temperature range of -22 to 122°F (-30 to 50°C). Actuators are housed in a NEMA 2 (IP40) enclosure and produce torque outputs ranging from 17 to 70 in-lb (2 to 8 Nm), depending on the specific model. The angle of rotation is mechanically adjustable up to 95°. Running times vary by torque rating: models rated at 17, 35, or 53 in-lb have a running time of 72 seconds, while the 70 in-lb (8 Nm) configuration requires 160 seconds. The unit features magnetic clutch overload protection and operates with sound levels below 45 dB.
Power Requirements
- DDA Series: Available on 110 VAC, 24 VAC (±10%, 50/60 Hz, single phase), with an optional 230 VAC supply.
- DDC Series: Powered by 24 VAC (±10%, 50/60 Hz, single phase).
Configuration Options
The series supports a range of configurations to accommodate different shaft sizes and control needs. Standard accessories include two imitative baffles, two baffle setscrews, one actuator body setscrew, and one aluminum gasket.
Torque and Model Selection
- 17 in-lb (2 Nm): Models DDA11/13 and DDC13.
- 35 in-lb (4 Nm): Models DDA21/23 and DDC23.
- 53 in-lb (6 Nm): Models DDA31/33 and DDC33.
- 70 in-lb (8 Nm): Models DDA41/43 and DDC43.
Mechanical and Electrical Features
- Fits shaft diameters of 0.4" (10 mm) or 0.5" (13 mm).
- Includes a visual position indicator and push-button manual override.
- DDC Feedback: Provides a 0 to 10 VDC feedback signal indicating damper position.
- Electrical Connection: Terminal block, 18 AWG wire.
Key Product Differences
The primary distinction between the two families lies in their control input and power architecture. The DDA series is designed for floating (two-position) signals with multiple voltage options including an optional internal auxiliary switch available upon contacting the factory. In contrast, the DDC series is dedicated to modulating applications using 4-20 mA or 0-10 VDC inputs on a fixed 24 VAC power supply and includes integrated position feedback.
Both series share identical physical dimensions (5-23/32" width x 4-53/64" height x 3-25/64" depth) and weight of 1.72 lb (0.78 kg). The units are not field serviceable; repair requires returning the unit to the factory.
