Honeywell ML7421- Manual
Honeywell ML7421– Manual, read for free online in PDF format. We hope this helps you resolve any issues you may have. If you have further questions, please contact us through the contact form.
Table of Contents:
- Page 2 – ORDERING INFORMATION
- Page 3 – INSTALLATION; When Installing this Product...; Location; CAUTION
- Page 4 – Mounting; Wiring
- Page 5 – Auxiliary Potentiometers; Auxiliary Switches
- Page 6 – OPERATION; General; Signal Input Failure
- Page 7 – Actuator Override; CHECKOUT; Direct Checkout
PRODUCT DATA
63-2515-4
® U.S. Registered Trademark
Copyright © 2002 Honeywell • All Rights Reserved
®
ML6421, ML7421
Non-Spring Return
Electric Linear Valve Actuators
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.
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.
Contents
Application ........................................................................
Features ...........................................................................
Specifications ...................................................................
Ordering Information ........................................................
Installation ........................................................................
Operation ..........................................................................
Checkout ..........................................................................
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Summary
ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS 63-2515—4 2 ORDERING INFORMATION When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number. If you have additiona...
ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS 3 63-2515—4 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 cau...
ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS 63-2515—4 4 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. 2. Place the U-bolt against the valve...
