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ML6174, ML7174 Non-Spring Return
ML6174
APPLICATION
The ML6174 and ML7174 are non-spring return direct
coupled actuators (DCA) used to control dampers in
applications such as variable air volume (VAV) terminal units.
Suitable for use with single pole double throw (spdt) floating
thermostats and electronic systems.
® U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • All Rights Reserved
Direct Coupled Actuators
FEATURES
• Damper shaft direct mount.
• 70 lb-in. torque.
• 45
(cw) or counterclockwise (ccw) directions.
• 90-second timing models suitable for use with
pressure-independent VAV systems.
• Seven-minute timing models suitable for use with
pressure-dependent VAV systems.
• Magnetic coupling provides 130 lb-in. (or less) stall
torque, eliminating the need for mechanical stops or
limit switch adjustments.
ML7174
• Two field-addable auxiliary switches.
• Auxiliary feedback potentiometer field-addable on
some models.
°
• 0
direction) on some models.
• Manual declutch on all models.
• W7620 Terminal Unit Controller compatibility.
• 2 to 10 Vdc or 4 to 20 mA control input for ML7174.
• Commercial Zone Damper in W7600 Commercial Zone
System compatibility.
• UL94-5V rated.
Application .......................................................................... 1
Features .............................................................................. 1
Specifications ...................................................................... 2
Ordering Information ........................................................... 2
Installation ........................................................................... 5
Operation ............................................................................ 9
Checkout ............................................................................. 11
°
°
°
, 60
, and 90
selectable stroke in either clockwise
°
to 30
minimum position adjustment (cw or ccw
PRODUCT DATA
Contents
63-2534-1
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Summary of Contents for Honeywell ML6174 Series
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Page 1: Table Of Contents
• UL94-5V rated. Contents Application ................1 Features ................1 Specifications ..............2 Ordering Information ............2 Installation ................5 Operation ................9 Checkout ................11 ® U.S. Registered Trademark 63-2534-1 Copyright © 1997 Honeywell Inc. • All Rights Reserved... -
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 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. - Page 3 ML6174, ML7174 NON-SPRING RETURN DIRECT COUPLED ACTUATORS Three-Minute Models: Noise Output: 90°—180 sec. 45 dBA at 1 meter maximum. 60°—120 sec. 45°—90 sec. Accessories: Seven-Minute Models: 200976A Auxiliary Potentiometer (0 to 500 ohm). 90°—420 sec. 200976C Auxiliary Potentiometer (0 to 2000 ohm). 60°—276 sec.
- Page 4 ML6174, ML7174 NON-SPRING RETURN DIRECT COUPLED ACTUATORS 1-13/16 (46) 3-5/8 (92) (25) 60° 60° 3 IN. (76 MM) MINIMUM SPACING 1-13/16 REQUIRED (46) FOR REMOVING CONDUIT COVER 45° 45° 5-7/8 (149) (22) M11621 3-3/4 (95) Fig. 1A. Approximate dimensions of ML6174C,D DCA in in. (mm). 2-7/8 (73) 1-11/16 (42) OPTIONAL...
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Page 5: Installation
ML6174, ML7174 NON-SPRING RETURN DIRECT COUPLED ACTUATORS INSTALLATION ML6174 and ML7174 Direct Coupled Actuators are shipped in the fully clockwise [cw arrow] 90° position as viewed from the end of the damper actuator shaft. When Installing this Product… CAUTION 1. Read these instructions carefully. Failure to follow them Equipment Damage Hazard. - Page 6 ML6174, ML7174 NON-SPRING RETURN DIRECT COUPLED ACTUATORS NOTE: Dampers with 90° stroke do not require the SHAFT ADAPTER range stop pin. 3. Insert the range stop pin into the appropriate (cw or ccw) 60° slot. The range stop pin is clipped into its final position only after the pin passes through both actuator plates (see Fig.
- Page 7 ML6174, ML7174 NON-SPRING RETURN DIRECT COUPLED ACTUATORS 5. Thread the locknut fully onto the setscrew. RANGE STOP PIN 6. Insert 1/4 in. setscrew into the desired hole, turning clockwise until resistance is encountered or the locknut contacts the housing. 7. If resistance is met before the setscrew is fully inserted, ACTUATOR PLATES stop and review the initial setup procedures as detailed in steps 1 through 3.
- Page 8 ML6174, ML7174 NON-SPRING RETURN DIRECT COUPLED ACTUATORS All wiring must comply with local electrical codes, ordinances 5. Apply power to the actuator. and regulations. Voltage and frequency of the transformer 6. After operational checkout, replace the cover by used with the ML6174 must correspond with the reversing the procedure in step 1.
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Page 9: Operation
ML6174, ML7174 NON-SPRING RETURN DIRECT COUPLED ACTUATORS IMPORTANT OPERATION Failure to follow the calibration procedures can result in improper resistance values at the desired VAV Systems stroke. 200976A,C Calibration VAV systems control the temperature within a space by varying the volume of supply air temperature. The system 1. - Page 10 ML6174, ML7174 NON-SPRING RETURN DIRECT COUPLED ACTUATORS ML6174 T641A THERMOSTAT (HOT) 24 VAC COMMON 24 VAC MOTOR CLOSE MOTOR OPEN PHASE SHIFT CAP 24 VAC T6984A DRIVE DRIVE SYSTEM WINDING WINDING POWER SUPPLY. PROVIDE DISCONNECT MEANS AND TRANSFORMER OVERLOAD PROTECTION, AS REQUIRED. T6984A SHOWN WIRED FOR COOLING ONLY.
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Page 11: Checkout
ML6174, ML7174 NON-SPRING RETURN DIRECT COUPLED ACTUATORS For an ML6174 issued with an spdt floating wall thermostat Current input (4 to 20 mA) (for pressure-dependent systems), use the following checkout procedure: When using a current controller (such as the W7600), parallel 1. - Page 12 ML6174, ML7174 NON-SPRING RETURN DIRECT COUPLED ACTUATORS 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.