ML7999A2001 – Honeywell Universal Actuator

Key Technical Specifications

• Brand: Honeywell / Model: ML7999A2001
• Product Type: Actuator – 85-264VAC, 50/60 Hz
• Power Input: 100-240 Vac +10%/-15%, 15VA maximum
• Frequency: 50 Hz or 60 Hz
• Torque Rating: 100 lb-in minimum (lift, hold, breakaway, stall)
• Stall Maximum Torque: 150 lb-in (17 Nm)
• Output Hub Position Accuracy: ±0.1°
• Actuator Stroke: 95° nominal ±3°, mechanically limited
• Feedback Potentiometer: 5000 ohms ±10%

Environmental & Operating Conditions

• Ambient Temperature: -40°F to +140°F (-40°C to +60°C)
• Storage Temperature: -40°F to +150°F (-40°C to +65°C)
• Operating Humidity: 5 to 95% RH, non-condensing
• Vibration Tolerance: 0.0 to 0.5g continuous (V2 level)
• Noise Rating: 55 dBA maximum at 1 meter

Key Features

• The ML7999A2001 includes an eight-digit hexadecimal password protection.
• A separate wiring compartment isolates line voltage from low voltage control.
• It couples directly to a 1/2-inch shaft with no extra parts required.
• Self-centering shaft reducers allow direct coupling to 5/16-inch and 3/8-inch shafts.
• A shaft coupler assembly works for shafts larger than 1/2-inch.
• Bracket accessory kit supports mounting to Honeywell V51 butterfly gas valves.
• Design life reaches 100,000 full-stroke cycles minimum.
• Repositioning life achieves 2,000,000 cycles minimum.

Control Signal Requirements

• The actuator needs a 4.25 Vdc differential to drive clockwise (DR1-DR2).
• It needs a -4.25 Vdc differential to drive counterclockwise (DR1-DR2).
• The actuator only responds after the R7999 passes the 8-digit ID signal via DR1-DR2.
• Control signal current requires 5 mA.

Timing Specifications

• Standard Timing (90° travel): 24 to 30 seconds
• Derated Cold-Start Timing (-40°F to -20°F): 150 seconds maximum

Frequently Asked Questions (FAQ)

• Q: Does the ML7999A2001 work with 24VAC power?
  A: No, it requires 85-264VAC. Use 100-240VAC for best results.
• Q: Can I use this actuator without the R7999 controller?
  A: No, the actuator needs the 8-digit hexadecimal password from the R7999 to operate.
• Q: What is the maximum stall torque?
  A: Maximum stall torque reaches 150 lb-in (17 Nm).
• Q: Is the feedback potentiometer included?
  A: Yes, a 5000 ohm ±10% position feedback potentiometer comes built-in.
• Q: Can it operate in freezing temperatures?
  A: Yes, ambient range goes down to -40°F (-40°C), but cold-start timing extends to 150 seconds.
• Q: Does it mount on a square shaft?
  A: Yes, it mounts directly on 1/2-inch round or square shafts.

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