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Honeywell ML6421 Product Data

Non-spring return electric linear valve actuators
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APPLICATION
The ML6421A,B Non-Spring Return Electric Linear Valve
Actuators are suitable for use with low-voltage, single-pole
double-throw (spdt), Series 60 two-position and floating
controllers. These actuators operate standard Honeywell
valves in heating, ventilating, and air conditioning (HVAC)
applications.
The ML7421A,B Non-Spring Return Electric Linear Valve
Actuators are modulating control actuators used with controls
that provide an analog output of 0 to 10 Vdc or 2 to 10 Vdc.
These actuators operate standard Honeywell valves in HVAC
applications. An internal selector plug can be used to reverse
the direction of action.
® U.S. Registered Trademark
Copyright © 2002 Honeywell • All Rights Reserved
Electric Linear Valve Actuators
®
ML6421, ML7421
Non-Spring Return
FEATURES
• Quick and easy installation.
• No separate linkage required.
• 3/4 in. (20 mm) stroke on ML6421A and ML7421A.
• 1-1/2 in. (38 mm) stroke on ML6421B and ML7421B.
• No adjustments required.
• Accurate valve positioning.
• Low power consumption.
• Selectable 0(2) to 10 Vdc or 0(4) to 20 mA input signal
with ML7421.
• Position feedback with ML7421.
• High close-off ratings.
• Direct/reverse acting with ML7421.
• Force-limiting end switches.
• Manual operator.
• Synchronous motor.
• Corrosion-resistant design.
• Maintenance free.
• Conduit connector knockout.
Application ........................................................................
Features ...........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
Operation ..........................................................................
Checkout ..........................................................................
PRODUCT DATA
Contents
1
1
2
2
3
6
7
63-2515-4

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  Summary of Contents for Honeywell ML6421

  • Page 1 Actuators are modulating control actuators used with controls that provide an analog output of 0 to 10 Vdc or 2 to 10 Vdc. These actuators operate standard Honeywell valves in HVAC applications. An internal selector plug can be used to reverse the direction of action.
  • Page 2: Specifications

    ML7421: 0 to 10 Vdc or 2 to 10 Vdc. Actuator Material: Cover: ABS plastic. Yoke and Base: Diecast aluminum. Stem Force: 405 lbf (1800N). Table 1. Close-off Ratings for ML6421, ML7421 Electric Linear Valve Actuators and Honeywell Valves (psi). Type Valve Flange V5011A,B,C V5011B V3350/51/60/61;V3450/51/60/61...
  • Page 3 (64) KNOCKOUTS 7/8 (22) YOKE DIAMETER 1-3/8 (35) Fig. 1. Approximate dimensions of ML6421, ML7421 Electric Linear Valve Actuators in in. (mm). INSTALLATION When Installing this Product… 1. Read instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.
  • Page 4 ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS Mounting 1. Place the actuator on the valve with the U-bolt around the valve collar. See Fig. 2. IMPORTANT When tightening the set screws, first tighten the right set screw. See Fig. 2.
  • Page 5 T775 (WITH 2 TO 10 VDC OUTPUT) POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. Fig. 7. ML7421 wiring using voltage input control and separate transformers. ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS ML7421 WIRING STRIP (HOT) Fig.
  • Page 6 The internal force sensor, using installed microswitches, turns off the actuator when the specified stem force is reached. Manual Operation The ML6421 and ML7421 are equipped with a manual operator knob (see Fig. 10) to open or close the valve in the event of power failure: 1.
  • Page 7 4. If the actuator does not move, make sure the actuator is properly installed. 5. If the actuator is correctly installed and does not run, replace the actuator. ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS ML7421 WIRING STRIP Fig. 12. Connections for overriding control signal to drive Controller Checkout 1.
  • Page 8 Automation and Control Solutions Honeywell Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Scarborough, Ontario M1V 4Z9 63-2515—4 B.B. Rev. 1-03 Honeywell International Honeywell Europe S.A. Control Products 3 Avenue du Bourget Honeywell Building...

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Ml7421