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APPLICATION
The ML6275 Spring Return Direct Coupled Rotary Actuator is
a floating control motor with an internal, electrically isolated
feedback potentiometer that can be used with controls that
provide switched or floating single pole double throw (spdt)
control output to operate dampers in heating, ventilation, and
air conditioning (HVAC) applications. The feedback potentio-
meter provides indication of the motor output hub position and
can be used for rebalancing an internal control circuit.
Copyright © 1995 Honeywell Inc. • All Rights Reserved
Direct Coupled Rotary Actuator
Spring Return
FEATURES
• Mounts directly on horizontal 3/8 in., 1/2 in., and
5/8 in. round and square damper shafts by using
the appropriate insert. Most models are shipped with
1/2 in. insert.
• Provides 25 lb-in. running and spring return torque.
• Magnetic coupling eliminates the need for mechanical
stops or limit switch adjustments by limiting stall
torque to 60 lb-in. maximum.
• 95° stroke provides necessary compression of rubber/
neoprene gaskets commonly used on 90° low leakage
dampers.
• 88 second synchronous timing can eliminate need for
feedback position indication in closed-loop
temperature control applications.
• Removable splined output hub permits premounting of
hub on damper shaft, providing installation flexibility.
• Reversible mounting allows actuator to be used for
either clockwise (cw) or counterclockwise (ccw)
spring rotation.
• Designed for both single-point and three-point
mounting, to allow installation flexibility.
• Available with or without a time-out feature. Models
without the time-out feature are designed to be used
with intelligent building management system and/or
controller.
• Standard models have two 8 mm by 12 mm long set
screws for securing the damper shaft. Actuator models
available for various shaft sizes that allow damper shaft
to operate centered inside the output hub.
• Standard one-meter cable with color-coded leadwires
allows external wire connections with 1/2 in. conduit
connectors.
• Two or more actuators can be mounted on one
damper shaft to increase output torque for use on
dampers larger than eight square feet.
General ............................................................................... 1
Features .............................................................................. 1
Specifications ...................................................................... 2
Ordering Information ........................................................... 2
Installation ........................................................................... 4
Operation ............................................................................ 9
Checkout ............................................................................. 11
ML6275
PRODUCT DATA
Contents
63-2493-1
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Summary of Contents for Honeywell ML6275
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Page 1: Table Of Contents
APPLICATION controller. • Standard models have two 8 mm by 12 mm long set The ML6275 Spring Return Direct Coupled Rotary Actuator is screws for securing the damper shaft. Actuator models a floating control motor with an internal, electrically isolated... -
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 Home and Building Control Sales Office (check white pages of your phone directory). 2. Home and Building Control Customer Relations... - Page 3 1-5/8 (41) 10-13/32 (264) MOUNTING BRACKET M8257 Fig. 1. Approximate dimensions of ML6275 Spring Return Direct Coupled Actuator and mounting bracket in in. (mm). Accessories: Environmental Protection Ratings: 205753 Hub Sleeve, 3/8 in NEMA1 standard with damper shaft in horizontal position...
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Page 4: Installation
Preparation to make sure the product is suitable for your application. Installer must be a trained, experienced service Before installing the ML6275 on the damper shaft, determine technician. the opening direction of the damper shaft to determine the After installation is complete, check out product operation correct spring return rotation and correctly connect the wiring. - Page 5 Fig. 3. Be careful when removing the retaining ring that gear. Most ML6275 Actuators are shipped with a 1/2 in. hub secures the output hub to the actuator housing. Use a sleeve.
- Page 6 ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR INDICATOR DETENTS 1 COUNTERCLOCKWISE SPRING ROTATION ARROW M7230A Fig. 4. ML6275 Actuator mounted for counterclockwise spring rotation with output hub inside actuator. (NOTE: NEMA rating applies only with damper shaft in horizontal position.) 63-2493—1...
- Page 7 ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR M7229 Fig. 5. Standard direct coupled mounting of ML6275 to a damper with counterclockwise spring rotation. 63-2493—1...
- Page 8 All wiring must comply with local electrical codes, ordinances and regulations. The ML6275 is designed for use with a Class 2 power supply. Voltage and frequency of the transformer used must correspond with the characteristics of the motor and those of the power supply.
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Page 9: Operation
12° OPERATION AUX. SWITCHES 3A, 120 VAC WHITE/BLUE WHITE/YELLOW The ML6275 Direct Coupled Actuator is designed to be used BLACK/RED 82° in ventilating and air conditioning installations to operate BLACK/BLUE dampers, ventilation flaps and louvers requiring up to 25 lb-in. - Page 10 ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR FULLY COUNTERCLOCKWISE SPRING RETURN INDICATOR START POSITIONS POINTER AT 90° POINTER AT 0° DETENT IN INSERT DETENT IN INSERT DRIVE CLOCKWISE TO CLOSE DRIVE CLOCKWISE TO OPEN (REVERSE ACTING) (DIRECT ACTING) FULLY CLOCKWISE SPRING RETURN INDICATOR START POSITIONS POINTER AT 90°...
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Page 11: Checkout
4. Connect 24 Vac to the appropriate leadwires (red to blue or red to yellow) to move the damper to the opposite position. The ML6275 should drive the The ML6275 Direct Coupled Actuator can be checked out damper. either directly or by using a controller. - Page 12 ML6275 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR Home and Building Control Home and Building Control Helping You Control Your World Honeywell Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 740 Ellesmere Road Golden Valley, MN 55422 Scarborough, Ontario M1P 2V9 QUALITY IS KEY 63-2493—1 G.R.