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Honeywell ML7421A Product Data
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Honeywell ML7421A Product Data

Electric linear valve actuator
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APPLICATION

The ML7421A,B Electric Linear Valve Actuators are
modulating control motors for use with low-voltage controls
that provide an analog output of 0 to 10 Vdc or 2 to 10 Vdc.
These actuators operate standard Honeywell valves in
heating, ventilating, and air conditioning (HVAC) applications.
® U.S. Registered Trademark
Copyright © 1996 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.
• Low power consumption.
• High close-off ratings.
• Force-limiting end switches.
• Manual operator.
• Synchronous motor.
• Corrosion-resistant design.
• Maintenance free.
• Conduit connector knockout.
Application .......................................................................... 1
Features .............................................................................. 1
Specifications ...................................................................... 2
Ordering Information ........................................................... 2
Installation ........................................................................... 3
Operation ............................................................................ 6
Checkout ............................................................................. 7
X-XX UL
ML7421A,B
1-1/2 in. (38 mm) stroke on ML7421B.
PRODUCT DATA
Contents
63-2517-1

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Summary of Contents for Honeywell ML7421A

  • Page 1: Table Of Contents

    PRODUCT DATA FEATURES • Quick and easy installation. • No separate linkage required. • 3/4 in. (20 mm) stroke on ML7421A; 1-1/2 in. (38 mm) stroke on ML7421B. • No adjustments required. • Accurate valve positioning. • Low power consumption.

  • Page 2: Specifications

    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 2C9. 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 3: Installation

    ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR Table 1. Close-off Ratings in psi for ML7421A,B Electric Linear Valve Actuators and V5011, V5013 Valves. Valve Type 1/2 in. 3/4 in. 1 in. 1-1/4 in. 1-1/2 in. 2 in. 2-1/2 in. 3 in. 4 in.
  • Page 4 ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR CAUTION Wiring Do not install actuator in a position below horizontal to CAUTION minimize risk of damage to the actuator in the event of condensation or a valve gland leak. Disconnect power supply before wiring to prevent electrical shock or equipment damage.
  • Page 5 ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR (HOT) (HOT) ML7421 ML7421 WIRING WIRING SENSOR SENSOR STRIP STRIP (HOT) (HOT) DUAL DUAL TRANSFORMERS TRANSFORMERS 500 OHM RESISTOR T775 (WITH 2 TO 10 VDC OUTPUT) T775 (WITH 4 TO 20 MA OUTPUT) POWER SUPPLY. PROVIDE DISCONNECT MEANS POWER SUPPLY.

  • Page 6: Operation

    Auxiliary Switches The 43191680 Dual Auxiliary Switch can be used on both the ML7421A and ML7421B Electric Linear Valve Actuators. Switching points are adjustable over the full length of the actuator stroke; for example, the switch can be used to switch pumps or to provide remote indication of any stroke position.

  • Page 7: Checkout

    ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR Actuator Override CHECKOUT The converter output signal override function can be used in freeze protection or similar applications. It forces the actuator The ML7421 Electric Linear Valve Actuator can be checked to a specific position, overriding the control signal. To exercise out either directly or using a controller.
  • 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.