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APPLICATION
The ML7425A,B 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
Heating, Ventilating, and Air Conditioning (HVAC)
applications. An internal selector plug can be used to reverse
the direction of action.
® U.S. Registered Trademark
Copyright © 1999 Honeywell Inc. • All Rights Reserved
Spring Return Electric Linear
FEATURES
• Quick and easy installation.
• No separate linkage required.
• ML7425A extends actuator stem on power failure;
ML7425B retracts actuator stem on power failure.
• Conduit connector is standard.
• No adjustments required.
• True spring return on power failure.
• Accurate valve positioning.
• Low power consumption.
• High close-off ratings.
• Force-limiting end switches.
• 0 to 10 Vdc or 2 to 10 Vdc signal input.
• Position feedback signal.
• Direct/reverse action.
• Fail-safe position selection.
• Synchronous motor.
• Corrosion resistant design.
• Maintenance free.
Application .......................................................................
Features ...........................................................................
Specifications ...................................................................
Installation ........................................................................
Operation .........................................................................
Checkout ..........................................................................
Ordering Information ........................................................
ML7425A,B
Valve Actuator
PRODUCT DATA
Contents
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63-2518-3
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Related Manuals for Honeywell ML7425A Series
Summary of Contents for Honeywell ML7425A Series
- Page 1 • Synchronous motor. • Corrosion resistant design. • Maintenance free. Contents Application ............... Features ................Specifications ..............Installation ................ Operation ................. Checkout ................Ordering Information ............® U.S. Registered Trademark 63-2518-3 Copyright © 1999 Honeywell Inc. • All Rights Reserved...
- Page 2 1K ohm maximum. 5 to 95% relative humidity, non condensing. Load: Close-off Pressure Ratings: 1 mA maximum. See Table 1. Table 1. Close-off ratings for ML7425A,B Electric Linear Valve Actuators and Honeywell Valves. Valve Type 1/2 in. 3/4 in. 1 in.
- Page 3 ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR Protection Standard: Accessories: IP54. 43191679-112 Single Auxiliary 220 Ohm Potentiometer. 43191679-111 Single Auxiliary 10 KOhm Potentiometer. Insulation: 43191680-105 Dual Auxiliary Switch (for 24 Vac use only). Protection Class II (24 Vac). 43196000-101 High Temperature Kit (1/2...11/2 in. valves).
- Page 4 ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR CAUTION Personal Injury Hazard. Manual spring handle is under tension and can turn quickly when lifted, pinching fingers between the handle and plastic casing. Use a screwdriver to lift the handle. See Fig. 5. 7.
- Page 5 ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR M6630 Fig. 6. Connecting power and control wiring to ML7425. ML7425 WIRING STRIP M6629 INPUT (FEEDBACK) Fig. 5. Removing spring retaining clip OUTPUT and releasing manual spring handle. – – Wiring CAUTION Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry.
- Page 6 ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR ML7425 SENSOR 100% WIRING 2 ... 10V 0 ... 10V STRIP (HOT) – SINGLE TRANSFORMER 40 VA 24 VAC T775 (WITH 2-10 VDC OUTPUT) M6631 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND Fig. 12. Location of W1, W2 and W3 selector plugs. M7895 OVERLOAD PROTECTION AS REQUIRED.
- Page 7 ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR Output Signal Feedback (F) CAUTION An analog output signal (2 to 10 Vdc) that represents the Equipment Damage Hazard. actual actuator stem position is available at Terminal F. It can Improper voltage through the 43191680 Dual be used for remote indication of the stem position.
- Page 8 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.