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ML6425, ML7425 Spring Return
Electric Linear Valve Actuators
APPLICATION
The ML6425 Spring Return Electric Linear Valve Actuators are
floating control actuators used with controllers that provide a
switched or floating single-pole double-throw (spdt) output.
These actuators operate standard Honeywell valves in
heating, ventilating, and air conditioning (HVAC) applications.
The ML7425 Spring Return Electric Linear Valve Actuators are
modulating control actuators used with controllers 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. An
internal selector plug can be used to reverse the direction of
action.
FEATURES
ML6425 and ML7425
• Accurate valve positioning.
• Quick and easy installation.
• No separate linkage required.
• On power failure:
ML6425A and ML7425A drive valve stem down.
ML6425B and ML7425B draw valve stem up.
• Conduit connector is standard.
• No adjustments required.
• True spring return on power failure.
• Low power consumption.
• High close-off ratings.
• Force-limiting end switches.
• Direct/reverse action.
• Synchronous motor.
• Corrosion resistant design.
• Maintenance free.
ML7425
• Position Feedback signal.
• Fail-safe position selection for control signal loss.
Application ........................................................................
Features ...........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
WIring ...............................................................................
Operation ..........................................................................
Checkout ..........................................................................
PRODUCT DATA
Contents
1
1
2
2
3
4
7
8
63-2516-04
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Related Manuals for Honeywell ML6425 Series
Summary of Contents for Honeywell ML6425 Series
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Page 1: Table Of Contents
• Corrosion resistant design. floating control actuators used with controllers that provide a • Maintenance free. switched or floating single-pole double-throw (spdt) output. These actuators operate standard Honeywell valves in heating, ventilating, and air conditioning (HVAC) applications. ML7425 • Position Feedback signal. -
Page 2: Specifications
If you have additional questions, need further information, or would like to comment on our products or services, please write or phone: 1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory). 2. Honeywell Customer Care... -
Page 3: Installation
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS Table 1. Close-off Ratings for ML6425, ML7425 Electric Linear Valve Actuators and Honeywell Valves (psi). Type Valve 1/2 in. 3/4 in. 1 in. 1-1/4 in. 1-1/2 in. 2 in. 2-1/2 in. 3 in. -
Page 4: Wiring
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS M6629 Fig. 5. Removing Spring Retaining Clip and Releasing Manual Spring Handle. M6632 Fig. 2. Attaching Actuator to Valve Collar. WIRING CAUTION Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry. Disconnect power supply before installation. - Page 5 ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS ML6425A,B WIRING T6984 (FLOATING CONTROLLER) ML7425 STRIP WIRING MOTOR OPEN STRIP MOTOR CLOSE INPUT (FEEDBACK) 24 Vac OUTPUT COMMON – – POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. ALL WIRING BLOCKS HAVE THE SAME NUMBER OF TERMINALS (8), BUT THE ONLY TERMINALS THAT ARE ACTIVE ON THIS BLOCK ARE T1, T5, W, AND B.
- Page 6 ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS SENSOR ML7425 ML7425 SENSOR WIRING WIRING STRIP STRIP (HOT) (HOT) – – SINGLE SINGLE TRANSFORMER TRANSFORMER 40 VA 24 VAC 40 VA 24 VAC 500 OHM RESISTOR T775 T775 (WITH 2-10 VDC OUTPUT) (WITH 4-20 MA OUTPUT) POWER SUPPLY.
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Page 7: Operation
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS Auxiliary Potentiometers Output Signal Feedback (F) The 43191679 Auxiliary Potentiometers can be used as An analog output signal (2 to 10 Vdc) that represents the actual feedback potentiometers and to provide remote indication of actuator stem position is available at terminal F. -
Page 8: Checkout
Automation and Control Solutions Honeywell International Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9 customer.honeywell.com ® U.S. Registered Trademark © 2007 Honeywell International Inc. 63-2516—04 J.I. Rev. 10-07...