Honeywell ML7421A1032 Product Data
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Honeywell ML7421A1032 Product Data

Electric linear valve actuator
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GENERAL
The ML7421A,B Electric Linear Valve Actuators for
modulating controlare equipped with a stepper motor for
exact positioning. The direction of movement is reversible by
means of an internal selector plug. These actuators operate
standard Honeywell valves in heating, ventilating, and air
conditioning (HVAC) applications.
® U.S. Registered Trademark
Copyright © 1999 Honeywell Inc. • All Rights Reserved
Electric Linear Valve Actuator
FEATURES
• Quick and easy installation.
• No separate linkage required.
• 3/4 in. (20 mm) stroke on ML7421A;
• No adjustments required.
• Accurate valve positioning.
• Selectable 0(2) to 10 Vdc/0(4) to 20 mA input signal.
• Position feedback.
• Force-limiting end switches.
• Manual operator.
• Direct or reverse acting.
• Synchronous motor.
• Corrosion resistant design.
• Maintenance free.
• Conduit connector knockout.
General ............................................................................
Features ..........................................................................
Specifications ..................................................................
Installation .......................................................................
Operation .........................................................................
Checkout .........................................................................
Ordering Information .......................................................
ML7421A,B
1-1/2 in. (38 mm) stroke on ML7421B.
PRODUCT DATA
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63-2517-2

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Summary of Contents for Honeywell ML7421A1032

  • Page 1 Honeywell valves in heating, ventilating, and air conditioning (HVAC) applications. Contents General ................Features ................Specifications ..............Installation ............... Operation ................. Checkout ................. Ordering Information ............® U.S. Registered Trademark 63-2517-2 Copyright © 1999 Honeywell Inc. • All Rights Reserved...

  • Page 2: Specifications

    Insulation: Model No. Stroke in Run Time in Class II (24 Vac) in. (mm) s at 60 Hz Approvals: ML7421A1032 3/4 (20) UL94-5V Flame retardant. ML7421B1023 1-1/2 (38) Meets CE requirements. Cable Entry: Electrical Ratings: Two knockout holes for 1/2 in. and 3/4 in. conduit standard Power Input: 24 Vac (+10%/-15%), 60 Hz on actuator case.

  • Page 3: Installation

    ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR Fig. 1. Approximate dimensions of ML7421A,B Electric Linear Valve Actuator in in. (mm). Location Valve Model Valve Size in in. Close-Off Rating psi (kPa) a Install the actuator in a location that allows enough clearance for mounting accessories and for servicing. See 404 lbf (1800N) Fig.
  • Page 4 ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR 2. Push the stem button retaining clip and hold. See Fig. 3. Fig. 4. ML7421 typical wiring diagram. Fig. 3. Attaching actuator to valve stem. 3. Lift the valve stem until the head of the valve stem button is inside the large slot of the stem button retaining clip.

  • Page 5: Operation

    ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR ACCESSORIES Signal Input (+) The analog input signal (+) range is set at the factory to 0 to 10 Vdc. Changing the position of the W2 selector plug sets Auxiliary switches the range to 2 through 10 Vdc. The 43191680 Dual Auxiliary Switch can be used on both Changing the W4 position to mA (see Fig.

  • Page 6: Checkout

    ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR Output Signal Feedback (F) CHECKOUT An analog output signal (2 to 10 Vdc) that represents the actual actuator stem position is available at Terminal F. It The ML7421 Electric Linear Valve Actuator can be checked can be used for remote indication of the stem position.

  • Page 7: Ordering Information

    Honeywell Inc., 1885 Douglas Drive North Minneapolis, Minnesota 55422-4386 (612) 951-1000 In Canada—Honeywell Limited/Honeywell Limitée, 155 Gordon Baker Road, North York, Ontario M2H 3N7. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
  • Page 8 ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR Home and Building Control Home and Building Control Honeywell Asia Pacific Inc. Honeywell Inc. Honeywell Limited-Honeywell Limitée Room 3213-3225 Honeywell Plaza 155 Gordon Baker Road Sun Hung Kai Centre P.O. Box 524 North York, Ontario No.

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Ml7421b1023

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