ML6185
Spring Return
Direct CoupledActuator
The ML6185 Spring Return Direct Coupled
RotaryActuatorisafloatingcontrolmotorthatcan
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.
■ 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.
■ 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.
■ Provides 50 lb-in. running and spring return torque.
■ Standard models have two 8 mm x 12 mm long set
screws for securing the damper shaft. Actuator
models are available for various shaft sizes that will
allow the damper shaft to operate centered inside the
output hub.
■ Magnetic coupling eliminates the need for mechani-
cal stops or limit switch adjustments by limiting
stall torque to 130 lb-in. maximum.
■ 95° stroke provides necessary compression of rub-
ber/neoprene gaskets commonly used on 90° low
leakage dampers.
■ Standard one-meter cable with color-coded lead-
wires allows external wire connections with 1/2 in.
conduit connectors.
■ 88 second synchronous timing can eliminate need
forfeedbackpositionindicationinclosed-looptem-
perature control applications.
■ Can mount two or more actuators on one damper
shaft to increase output torque for use on dampers
larger than 16 square feet.
■ Removable splined output hub permits premounting
ofthehubonthedampershaft, providinginstallation
flexibility.
■ Reversible mounting allows actuator to be used for
either clockwise (cw) or counterclockwise (ccw)
spring rotation.
CONTENTS
Specifications ................................................. 2
Ordering Information ..................................... 2
Installation ..................................................... 4
Operation ....................................................... 9
Checkout....................................................... 11
■ Designedforbothsingle-pointandthree-pointmount-
ing, providing installation flexibility.
G.R. • Rev. 4-95 • ©Honeywell Inc. 1995
63-2483-2
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ML6185
SPECIFICATIONS
Fig. 1—Approximate dimensions of ML6185 Spring Return Direct Coupled Actuator and mounting
bracket in in. (mm).
1-5/32 (29)
6-25/32 (173)
1-17/32 (39)
3-1/16
(79)
8-9/32 (210)
3-29/32
(99)
23/32
(18)
3-15/16 (100)
1-21/32
(42)
3-1/2
(89)
1-5/8
(41)
1-9/32
(32)
CLEARANCE
REQUIRED
FOR SPLINED
HUB MOUNTING
1/2 (13)
3-29/32
(99)
1-13/32
(36)
1-3/32
(28)
135o
± 15o
13/32
(10)
13/64 (5)
3/4 (19)
5/16
(8)
3/8
(10)
1-13/32 (36)
4-13/32 (112)
1-5/8 (41)
10-13/32 (264)
M8257
MOUNTING BRACKET
3
63-2483—2
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ML6185
SPECIFICATIONS • INSTALLATION
DEVICE WEIGHT: 4.0 lb (1.82 kg).
NOISE RATING: (Driving only) 45 dBA maximum at
0.9m.
UL873: (Line voltage auxiliary switches).
CSA: FILE NUMBER E4436, Guide Number XAPX.
ENVIRONMENTALPROTECTIONRATINGS:NEMA1
standard with damper shaft in horizontal position.
MOUNTINGTAB:ForusewithUniversalmountingbracket.
ACCESSORIES:
SPRING ROTATION: Clockwise (cw); counterclockwise
(ccw) by reverse mounting.
POSITION INDICATOR: Mounted on actuator hub.
ACTUATOR DESIGN LIFE:
205820A 3-Point Mounting Kit.
Full Stroke Cycles: 60,000.
Repositions: 1,500,000.
205830A Crank-Arm Accessory.
205753 Hub Sleeve, 3/8 in.
Spring Return Cycles: 7,500.
205758 Hub Sleeve, 5/8 in.
APPROVALS:
UL94-5V: (Enclosure) Plenum rating.
Installation
WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous
condition.
2. Check the ratings and description given in this specifi-
cationtomakesuretheproductissuitableforyourapplication.
3. Installer must be a trained, experienced service
technician.
A mounting bracket (see Fig. 1) is provided with some
models to aid in installing the actuator. The bracket can be
bent to any shape to support the actuator at the correct
height.
The ML6185 Direct Coupled Actuator can also be three-
point mounted using the two front gear housing slots and
the adapter bracket. Secure two screws through the two
front gear housing slots and position the adapter bracket to
secure the rear of the actuator. Three point mounting is used
for foot mounting the actuator or internally mounting the
actuator in the duct, when direct shaft coupling is not
possible.
4. After installation is complete, check out product op-
eration as provided in these instructions.
CAUTION
1. Disconnect power before installation to prevent
electrical shock or equipment damage.
2. Never turn motor output hub by hand or with a
wrench.
CAUTION
Do not use the actuator as a shaft bearing. The
actuator must be used only to supply rotational
torque. To prevent damage to the actuator, avoid
any side loads to the actuator output coupling
bearings.
3. Do not install actuator in areas with acid fumes
or other deteriorating vapors that might attack
the metal parts of the actuator.
4. Do not install actuator in areas with escaping
gas or other explosive vapors that could be
ignited by a spark from the actuator or attached
accessories.
PREPARATION
Before installing the ML6185 on the damper shaft,
determine the opening direction of the damper shaft to
determine the correct spring return rotation and correctly
connect the wiring. The ML6185 can be mounted to pro-
vide clockwise or counterclockwise spring return. Reverse
the actuator, if necessary, to provide the desired spring
action.
LOCATION
Install the actuator in any location free from acid fumes or
other deteriorating vapors that might attack the metal parts of
the actuator. Make sure the location is not subject to escaping
gas or other explosive vapors that could accidentally be
ignited by a spark from the actuator or its attached parts.
Install the actuator in a location that allows enough clear-
ance for mounting accessories and for servicing.
INSTALLATION
Installing the Actuator and Mounting Bracket (Single
Point Mounting)
When the direction of the damper shaft rotation is deter-
mined (either cw
1. Place the ML6185 Direct Coupled Actuator over the
damper shaft.
2. Position the actuator for best access to the actuator
damper shaft locking screw.
3. Install the mounting bracket (see Fig. 2) and adjust it
to support the actuator at the correct height. Mark the screw
holes for installing the mounting bracket on the damper
housing.
or ccw
), proceed as follows:
MOUNTING
The ML6185 Direct Coupled Actuator is designed to
operate a damper by driving the damper shaft either
cw
or ccw
depending on damper design. All
actuators are shipped in the fully closed position.
The ML6185 Direct Coupled Actuator is designed for
single-pointmountingwhenusinganadapterbracket. Single-
pointmountingistypicallyusedwhentheactuatorismounted
on the damper frame.
63-2483—2
4
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ML6185
INSTALLATION
4. Remove the mounting bracket and actuator.
5. Drill or center punch the starting holes for the mount-
ing bracket screws (or use no. 10 self-tapping sheet metal
screws).
6. Place the actuator and mounting bracket back into
position over the damper shaft and install the mounting
bracket screws.
7. Tighten the two 8 mm x 12 mm long set screws firmly
against the damper shaft (maximum tightening torque is
100 lb-in.).
Fig. 2—Installing mounting bracket on ML6185
Direct Coupled Actuator.
Installing the Actuator for Three-Point Mounting
The ML6185 Direct Coupled Actuator is designed with
removable hub sleeves to accommodate specific damper
shaft sizes. Proper sleeve selection is necessary when three-
point mounting is used to avoid excessive strain on the
output gear. Most ML6185 Actuators are shipped with a
1/2 in. hub sleeve. For field use, several hub sleeve sizes are
available. See the Accessories listing in the Specifications
section. Shaft sizes are stamped on the sleeves.
90
60
30
The ML6185 Direct Coupled Actuator can be mounted
directly on the motor shaft with the actuator in any position
when the actuator housing is parallel with the damper
housing or frame. (See Fig. 7.)
The ML6185 Direct Coupled Actuator has a reversible
output hub. The hub is factory mounted on the top of the
actuator gear housing. When attaching to damper shafts
less than 3.5 in. (76 mm) long, or for ease of mounting, the
output hub can be mounted to the inside of the actuator gear
housing. See Fig. 3. Be careful when removing the retain-
ing ring that secures the output hub to the actuator housing.
Use a flatheaded screwdriver to pry the ring loose.
M9386
Fig. 3—Mounting hub to inside of actuator.
2
6
1
3
60
30
90
DETENT
INSERT
60
30
0
4
5
.500
INDICATOR
DETENTS
. 5 0 0
M7228
5
63-2483—2
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ML6185
INSTALLATION
Other possible mounting configurations and standard
connections are shown in Fig. 4 through 7.
Fig. 4—ML6185 Actuator mounted for counterclockwise spring rotation with the output hub inside the
actuator. (NOTE: NEMA rating applies only with damper shaft in the horizontal position.)
60
30
90
60
30
0
1
INDICATOR
DETENTS
1
COUNTER CLOCKWISE SPRING ROTATION ARROW
M7230A
63-2483—2
6
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ML6185
INSTALLATION
Fig. 5—Standard direct coupled mounting of ML6185 to a damper with counterclockwise spring rotation.
60
30
90
60
30
.500
. 5 0 0
M7229
7
63-2483—2
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ML6185
INSTALLATION
WIRING
Fig. 6—ML6185 Actuator standard electrical
connection.
CAUTION
Disconnect power supply before wiring to prevent
electrical shock or equipment damage.
All wiring must comply with local electrical codes,
ordinances and regulations. The ML6185 is designed for
use with a Class 2 power supply. Voltage and frequency of
the transformer used must correspond with the characteris-
tics of the motor and those of the power supply. See Fig. 8
for a typical wiring connection.
60
30
90
The ML6185 has an aluminum die cast housing with
two integral cast bosses on the end of the device, tapped for
1/2 in. conduit fittings. Some models are shipped with a
water seal in the conduit opening. When conduit is needed,
remove the seal before routing the cable.
60
30
.500
. 5 0 0
ML6185 models with Factory-mounted Auxiliary
Switches (See Fig. 9)
ML6185C,F models have two nonadjustable line volt-
age rated spdt auxiliary switches with switches factory set
to make common to normally open at 12° and 82° rotation
from the counterclockwise stop. See Fig. 9.
IMPORTANT: Actuators driving in parallel may not be
synchronized with each other. In normal operation, if
all actuators are driven to the fully open or fully closed
position, the actuators will again be synchronized.
TO JUNCTION
BOX (UP TO
3 FT. AWAY)
MOUNTING
BRACKET
Fig. 8—ML6185 typical wiring diagram.
M7231
ML6185
OPEN
BLUE
Fig. 7—ML6185 Actuator can be mounted in
any position. (NOTE: NEMA rating applies only
with damper shaft in the horizontal position.)
MOTOR
CLOSE
YELLOW
OPTIONAL
TIME OUT
2
24 HOT
RED
POWER
SUPPLY
1
SPRING
CONTROL
L1
(HOT)
24 VAC
24 GND
BLACK
L2
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
TIME OUT FUNCTION AVAILABLE WITH ML6185D,F MODELS.
M7224
60
Fig. 9—ML6185C,F wiring for auxiliary
switches.
30
90
60
30
0
500
5 0 0
WHITE/RED
12°
82°
AUX. SWITCHES
3A 120 VAC
WHITE/BLUE
WHITE/YELLOW
BLACK/RED
BLACK/BLUE
BLACK/YELLOW
M7227A
M9384
63-2483—2
8
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ML6185
INSTALLATION • OPERATION
Connecting ML6185 Actuators in Parallel
ML6185 Actuators can be stacked on one damper shaft
to increase the output torque required to drive dampers
larger than 16 square feet.
leadwires (red, black, yellow and blue) in parallel. The
number of actuators that may be wired in parallel is depen-
dent on the transformer VA rating. Make certain that the
connected load does not exceed the current capacity of the
controller/thermostat. See Fig. 10 and 11.
To make sure proper phasing occurs, connect all four
Fig. 10—Common transformer with two
controller outputs and two actuators.
Fig. 11—Common transformer with one
controller output and two actuators.
ML6185
ML6185
CONTROLLER
BLUE
CONTROLLER
BLUE
R
B
R
B
YELLOW
YELLOW
1
W
1
W
RED
L1
(HOT)
RED
L1
(HOT)
BLACK
BLACK
L2
L2
ML6185
ML6185
CONTROLLER
BLUE
BLUE
R
B
YELLOW
YELLOW
W
RED
RED
BLACK
BLACK
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
M7226A
M7225A
Operation
The ML6185 Direct Coupled Actuator is designed to be
used in ventilating and air conditioning installations to
operate dampers, ventilation flaps and louvers requiring up
to 50 lb-in. torque. If the power fails, the actuator will
spring return to the starting position. The actuator is de-
signed for reversible mounting. Arrows are molded into the
covers to show the spring return direction. The larger cover
shows a counterclockwise (ccw) spring rotation; the smaller
cover shows a clockwise (cw) spring rotation.
The ML6185 Direct Coupled Actuator is operated by an
spdt floating controller. When using an spdt floating con-
troller, the actuator will be driven toward its fully open
position when the controller makes R to B and toward the
fully closed position when the controller makes R to W. It
stops when neither contact is made.
four distinct positions where the indicator can be placed.
The indicator can be removed (by first removing the output
hub) to provide proper damper orientation. The indicator
can be indexed to show cw or ccw open or closed, using the
detents that are 90° apart. See Fig. 12. If the spring return
position is the open position, rotate the indicator until it
points to 90 on the scale. If the spring return position is the
closed position, rotate the indicator until it points to zero on
the scale. A detent can be felt at both stops; the detents
maintain the indicator position.
The ML6185D and ML6185F models provide a time-
out function that removes power from the actuator sub-
motor if the actuator remains in one position (closed, open
or any intermediate position) for longer than a nominal 100
seconds. This time-out function helps to extend actuator
life.
IMPORTANT: The ML6185 is designed to respond to
instantaneous contact closures from a DDC Con-
troller. Be careful not to short cycle the actuator.
Unstabledampercontrolmaycauseprematureactua-
tor failure.
IMPORTANT: The ML6185 was designed to provide 7500
springreturns;therefore,theactuatorcanbeunpowered
daily for night shutdown control. However, rapidly
cycling the actuator by removing control voltage will
lead to premature spring failure.
The actuator has a position indicator to depict shaft
position. As the indicator moves with the shaft, it gives an
angular representation of the damper position. There are
9
63-2483—2
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ML6185
OPERATION
Fig. 12—ML6185 indicator start positions.
FULLY COUNTERCLOCKWISE SPRING RETURN INDICATOR START POSITIONS
POINTER AT 90°
POINTER AT 0°
90
90
60
60
60
60
30
0
30
0
30
0
30
0
DETENT IN INSERT
DETENT IN INSERT
DRIVE CLOCKWISE TO CLOSE
(REVERSE ACTING)
DRIVE CLOCKWISE TO OPEN
(DIRECT ACTING)
FULLY CLOCKWISE SPRING RETURN INDICATOR START POSITIONS
POINTER AT 90°
POINTER AT 0°
90
90
60
60
60
60
30
0
30
0
30
0
30
0
M7235
DETENT IN INSERT
DETENT IN INSERT
DRIVE COUNTERCLOCKWISE
TO CLOSE (REVERSE ACTING)
M7235B
DRIVE COUNTERCLOCKWISE
TO OPEN (DIRECT ACTING)
63-2483—2
10
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ML6185
CHECKOUT
Checkout
The ML6185 Direct Coupled Actuator can be checked
out either directly or by using a controller.
4. Connect 24 Vac to the appropriate leadwires (red to
blue or red to yellow) to move the damper to the opposite
position. The ML6185 should drive the damper.
IMPORTANT: When power is interrupted, the actuator
returnstothenormalstartingpositionusingthespring
mechanism. When power is restored, the controller
input will not operate the actuator until the spring is
fully wound and locked. The spring winding process
takes approximately 100 seconds, depending on the
number of degrees of spring return remaining at power
interrupt (i.e., 10° of spring return remaining takes 10
seconds). (If the actuator is not in the closed position,
it will run to the closed position as the spring is
winding.) Once the spring is locked in its fully wound
position, the actuator responds to inputs to the red-to-
blue or red-to-yellow leadwires.
5. If the actuator does not run, verify that the actuator is
properly installed for either cw
or ccw
rotation.
6. If the actuator operates in the opposite direction than
desired, reverse the blue and yellow leadwires.
7. If the actuator is correctly installed and still does not
run, replace the actuator.
CONTROLLER CHECKOUT
1. Adjust the setpoint of the controller to call for cooling.
Observe the actuator.
2. If the damper is closed, it should begin to open.
3. If the damper remains closed, move the setpoint of the
controller farther below the room temperature.
4. If the damper still does not move, check for the
presence of 24 Vac in the input.
5. Make sure the actuator spring is fully wound by
applying power for at least 100 seconds.
6. If 24 Vac is present and the actuator does not operate,
reverse the controller leadwires to determine if the device
was miswired.
DIRECT CHECKOUT
1. Mount the actuator for the required application (either
cw
or ccw
rotation to open the damper).
2. Checkthedamperposition andmakesurethat24Vacis
present on the red and black leadwires.
3. Make sure the actuator spring is fully wound and
locked by applying power for at least 100 seconds.
7. Ifthewiringiscorrectand24Vacispresentontheinput
terminals but the actuator does not run, replace the actuator.
11
63-2483—2
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Home and Building Control
Honeywell Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Home and Building Control
Honeywell Limited—Honeywell Limitée
740 Ellesmere Road
Helping You Control Your World
Scarborough, Ontario
M1P 2V9
QUALITY IS KEY
Printed in U.S.A.
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