Honeywell ML9185 User manual

PRODUCT DATA
Copyright © 1996 Honeywell Inc. • All Rights Reserved
GENERAL
The ML9185 Spring Return Direct Coupled Rotary Actuator is
a proportioning control motor that can be used with Series 90
controls to operate dampers in heating, ventilation, and air
conditioning (HVAC) applications.
ML9185 Spring Return
Direct Coupled Rotary Actuator
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 shipped with 1/2 in.
insert.
•Provides 50 lb-in. running and spring return torque.
•Magnetic coupling eliminates the need for mechanical
stops or limit switch adjustments by limiting stall
torque to 130 lb-in. maximum.
•95°stroke provides necessary compression of rubber/
neoprene gaskets commonly used on 90°low leakage
dampers.
•Removable splined output hub permits premounting
of the hub on the 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, providing 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
are available for various shaft sizes that allow the
damper shaft to operate centered inside the output hub.
•Standard one-meter cable with color-coded leadwires
for external wire connections with 1/2 in. conduit
connectors.
•Can mount two or more actuators on one damper
shaft to increase output torque for use on dampers
larger than 16 square feet.
CONTENTS
General ............................................................................... 1
Features .............................................................................. 1
Specifications ...................................................................... 2
Ordering Information ........................................................... 2
Installation ........................................................................... 4
Operation ............................................................................ 9
Checkout ............................................................................. 10
63-2494-1

ML9185 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR
63-2494—1 2
SPECIFICATIONS
Models:
ML9185 Spring Return Direct Coupled Rotary Actuators.
ML9185A: High Torque (50 lb-in.) Direct Coupled Rotary
Actuator without auxiliary switches and without time-out
function.
ML9185C: High Torque (50 lb-in.) Direct Coupled Rotary
Actuator with two line voltage rated auxiliary switches,
without time-out function.
ML9185D: High Torque (50 lb-in.) Direct Coupled Rotary
Actuator without auxiliary switches and with time-out
function.
ML9185F: High Torque (50 lb-in.) Direct Coupled Rotary
Actuator with two line voltage auxiliary switches and
time-out function.
Electrical Ratings:
Power Input: 24 Vac ±20%, 50/60 Hz.
Power Consumption:
ML9185A-C: 12 VA maximum at 24 Vac.
ML9185D,F: 12 VA maximum at 24 Vac.
Auxiliary Switch Ratings: 120, 240 Vac: 3 AFL, 18 ALR, 1A
pilot duty.
Cable Ratings:
Control: Standard models include nonplenum UL/CSA
rated, 30V, 60°C, 20 gauge cable.
Auxiliary Switch: UL/CSA rated, 300V, 90°C, 18 gauge
cable.
Controller Type:
Series 90 control circuit, 135 ohm, Series 90 proportioning
controller.
Torque Ratings (At Rated Voltages):
Lift and Hold: 50 lb-in. (6 N•m).
Breakaway Minimum: 50 lb-in. (6 N•m).
Stall Minimum: 50 lb-in. (6 N•m) spring return.
Stall Maximum: 130 lb-in. (15 N•m).
Actuator Stroke:
95°nominal ±2°, mechanically limited.
Actuator Timing at 90°Stroke:
88 +/- 2 seconds synchronous at 60 Hz from 0°F to 140°F.
106 +/- 2 seconds at 50 Hz.
Spring Wind Timing (Upon Power Restoration Only): 100 sec-
onds nominal at 60 Hz, 120 seconds at 50 Hz.
Spring Return Timing:
10 seconds minimum per 90°at 72°F no load.
30 seconds maximum per 90°at 72°F at rated load.
5 minute maximum at -30°F at rated load.
Ambient Temperature Range:
-30°F to +140°F (-35°C to +60°C).
Storage Temperature:
-30°F to 150°F (-35°C to 65°C).
Humidity:
5 to 95 percent relative humidity, noncondensing.
Mounting:
Mounts directly on horizontal 3/8 in. to 5/8 in. (12 to 16 mm)
round or square damper shaft.
Minimum Shaft Length Required:
•3.5 in. (76 mm) when the shaft attachment is made on
the side of the actuator opposite the duct.
•0.65 in. (16 mm) when the hub is mounted on the shaft
before the actuator is installed.
Most actuators are shipped with specifically sized hubs.
Some models contain an assembly with assorted hub
inserts. Mounting bracket included with most models.
Dimensions:
See Fig. 1.
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, or specify.
1. Model number.
2. Application.
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 Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Logistics
Honeywell Inc., 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitee, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. 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.

ML9185 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR
63-2494—1
3
M8257
135
o
± 15
o
1-3/32
(28)
1-13/32
(36)
5/16
(8)
13/32
(10)
10-13/32 (264)
3/4 (19)
1-5/8 (41)
1-13/32 (36)
4-13/32 (112)
3/8
(10)
CLEARANCE
REQUIRED
FOR SPLINED
HUB MOUNTING
1-5/32 (29)
3-1/2
(89)
13/64 (5)
MOUNTING BRACKET
1/2 (13)
1-9/32
(32)
3-15/16 (100)
23/32
(18)
8-9/32 (210)
3-29/32
(99)
1-21/32
(42)
1-5/8
(41)
3-29/32
(99)
3-1/16
(79)
17/32 (39)
6-25/32 (173)
Fig. 1. Approximate dimensions of ML9185 Spring Return Direct Coupled Actuator and mounting bracket in in. (mm).

ML9185 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR
63-2494—1 4
Device Weight:
4.0 lb (1.82 kg).
Noise Rating (Driving Only):
45 dBA maximum at 1.0m.
Spring Rotation:
Clockwise (cw); counterclockwise (ccw) by reverse mounting.
Position Indicator:
Mounted on actuator hub.
Actuator Design Life:
Full Stroke Cycles: 60,000.
Repositions: 1,500,000.
Spring Return Cycles: 7,500.
Approvals:
UL94-5V (enclosure) plenum rating.
UL873 (line voltage auxiliary switches).
CSA: File Number E4436, Guide Number XAPX.
Environmental Protection Ratings:
NEMA1 standard with shaft in the horizontal position.
Mounting Tab:
For use with Universal mounting bracket.
Accessories:
205820A 3-Point Mounting Kit.
205830A Crank-Arm Accessory.
205753 Hub Sleeve, 3/8 in.
205758 Hub Sleeve, 5/8 in.
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
specification to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation 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.
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.
Location
Install the actuator in any location free from acid fumes or
other deteriorating vapors that can 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 clearance
for mounting accessories and for servicing.
Mounting
The ML9185 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 ML9185 Direct Coupled Actuator is designed for single-
point mounting when using an adapter bracket. Single-point
mounting is typically used when the actuator is mounted on
the damper frame.
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 ML9185 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 mounting the actuator internally in
the duct when direct shaft coupling is not possible.
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.
Preparation
Before installing the ML9185 on the damper shaft, determine
the opening direction of the damper shaft to select the correct
spring return rotation and correctly connect the wiring. The
ML9185 can be mounted to provide clockwise or
counterclockwise spring return. Reverse the actuator, if
necessary, to provide the desired spring action.
Installing Actuator and Mounting Bracket (Single
Point Mounting)
When the direction of the damper shaft rotation is determined
(either cw or ccw ), proceed as follows:
쐃Place the ML9185 Direct Coupled Actuator over the
damper shaft.
쐇Position the actuator for best access to the actuator
damper shaft locking screw.
쐋Install 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.

ML9185 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR
63-2494—1
5
쐏Remove the mounting bracket and actuator.
쐄Drill or center punch the starting holes for the mounting
bracket screws (or use no. 10 self-tapping sheet metal
screws).
쐂Place the actuator and mounting bracket back into
position over the damper shaft and install the mounting
bracket screws.
쐆Tighten the two 8 mm x 12 mm long set screws firmly
against the damper shaft (maximum tightening torque is
100 lb-in.).
60
30
90
M9386
Installing Actuator for Three-Point Mounting
The ML9185 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 ML9185 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.
The ML9185 Direct Coupled Actuator can be mounted directly
on the motor shaft with the actuator in any position if the
actuator housing is parallel with the damper housing or frame.
(See Fig. 7.)
The ML9185 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 retaining ring that
secures the output hub to the actuator housing. Use a
flatheaded screwdriver to loosen the ring.
Other possible mounting configurations and standard
connections are shown in Fig. 4 through 7.
.500
.500
30
30
0
60
60 90
M7228
1
6
4
5
2
3
DETENT
INSERT
INDICATOR
DETENTS
Fig. 3. Mounting hub to inside of actuator.
Fig. 2. Installing mounting bracket on ML9185 Direct
Coupled Actuator.

ML9185 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR
63-2494—1 6
30
30
0
60
6090
M7230A
INDICATOR
DETENTS
1
1COUNTERCLOCKWISE SPRING ROTATION ARROW
Fig. 4. ML9185 Actuator mounted for counterclockwise spring rotation with output hub inside actuator.
(NOTE: NEMA rating applies only with damper shaft in horizontal position.)

ML9185 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR
63-2494—1
7
.500
.500
30
30
60
6090
M7229
Fig. 5. Standard direct coupled mounting of ML9185 to damper with counterclockwise spring rotation.

ML9185 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR
63-2494—1 8
WIRING
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 ML9185 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 with those of the power supply. See Fig. 8 for a
typical wiring connection.
The ML9185 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.
ML9185 Models with Factory-mounted
Auxiliary Switches (See Fig. 9)
ML9185C,F models have two nonadjustable line voltage
rated spdt auxiliary switches that are 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 cannot be synchronized
with each other. In normal operation, when all
actuators are driven to the fully open or fully closed
position, the actuators are again synchronized.
M4442A
ML9185
SERIES 90
CONTROLLER
B
W
R
BLUE
YELLOW
135 OHM
BLACK
RED
B
W
24V COMMON (T1)
R (T2)
24 VAC
L1
(HOT)
L2
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 8. ML9185 typical wiring diagram.
Fig. 9. ML9185C,F wiring for auxiliary switches.
12°
82°
M7877
COMMON
COMMON
NO
NO
NC
NC
WHT/RED
WHT/BLU
WHT/YEL
BLACK/RED
BLACK/BLU
BLACK/YEL
INTERNAL
AUXILIARY
SWITCH
3A 24V AC
SWITCHES SHOWN AT ACTUATOR CLOSED POSITION
.500
.500
30
30
60
60 90
M7231
MOUNTING
BRACKET
TO JUNCTION
BOX (UP TO
3 FT AWAY)
Fig. 6. ML9185 Actuator standard electrical connection.
M9384
30
0
60
500
500
90 60
30
Fig. 7. ML9185 Actuator can be mounted in any position.
NOTE: NEMA rating applies only with damper shaft in
horizontal position.)

ML9185 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR
63-2494—1
9
Connecting ML9185 Actuators in Parallel
ML9185 Actuators can be stacked on one damper shaft to
increase the output torque required to drive dampers larger
than 16 square feet.
To make sure proper phasing occurs, connect all four
leadwires (red, black, yellow and blue) in parallel. The
number of actuators that can be wired in parallel is dependent
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.
OPERATION
The ML9185 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. When the power fails, the actuator spring returns to
the starting position. The actuator is designed 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 ML9185 Direct Coupled Actuator is operated by an
electronic proportional controller simulating a 135 ohm
slidewire. The standard Series 90 controller has R, B and W
terminals. As the controller reduces the resistance between
terminals R and W, the motor drives closed. When the
controller increases the resistance, the motor drives open.
IMPORTANT
The ML9185 is designed to respond to
instantaneous contact closures from a DDC
Controller. Be careful not to short cycle the actuator.
Unstable damper control can cause premature
actuator 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 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. When the spring return position is in
the open position, rotate the indicator until it points to 90 on
the scale. When the spring return position is in 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 ML9185D and ML9185F models provide a time-out
function that removes power from the actuator sub-motor
when the actuator remains in one position (closed, open or
any intermediate position) for longer than a nominal 100 sec-
onds. This time-out function helps to extend actuator life.
IMPORTANT
The ML9185 was designed to provide 7500 spring
returns; therefore, the actuator can be unpowered
daily for night shutdown control. However, rapidly
cycling the actuator by removing control voltage
leads to premature spring failure.
L1
(HOT)
L2
1
1
BLUE
YELLOW
RED (T2)
BLACK (T1)
ML9185
BLUE
YELLOW
RED (T2)
BLACK (T1)
ML9185
M4436A
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
SERIES 90
CONTROLLER
SERIES 90
CONTROLLER
RB
W
RB
W
Fig. 10. Common transformer with two controller outputs
and two actuators.
L1
(HOT)
L2
1
1
BLUE
YELLOW
RED (T2)
BLACK (T1)
ML9185
BLUE
YELLOW
RED (T2)
BLACK (T1)
ML9185
M4440A
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
SERIES 90
CONTROLLER
RB
140
OHM
W
Fig. 11. Common transformer with one controller output
and two actuators.

ML9185 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR
63-2494—1 10
30
30
60
60 90
00
30
30
60
60 90
00
30
30
60
60 90
00
30
30
60
60 90
00
FULLY COUNTERCLOCKWISE SPRING RETURN INDICATOR START POSITIONS
FULLY CLOCKWISE SPRING RETURN INDICATOR START POSITIONS
DRIVE CLOCKWISE TO CLOSE
(REVERSE ACTING)
DRIVE COUNTERCLOCKWISE
TO CLOSE (REVERSE ACTING) DRIVE COUNTERCLOCKWISE
TO OPEN (DIRECT ACTING)
DRIVE CLOCKWISE TO OPEN
(DIRECT ACTING)
M7235
DETENT IN INSERT DETENT IN INSERT
DETENT IN INSERT DETENT IN INSERT
POINTER AT 90°
POINTER AT 90°
POINTER AT 0°
POINTER AT 0°
M7235B
Fig. 12. ML9185 indicator start positions.
CHECKOUT
The ML9185 Direct Coupled Actuator can be checked out
either directly or by using a controller.
IMPORTANT
When power is interrupted, the actuator returns to
the normal starting position using the spring
mechanism. When power is restored, the controller
input cannot 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 (for example, 10
° of spring return
remaining takes ten seconds). When the spring is
locked in its fully wound position, the actuator
responds to inputs to the red-to-blue or red-to-yellow
leadwires.
Direct Checkout
쐃Mount the actuator for the required application (either
cw or ccw rotation to open the damper).
쐇Check the damper position and make sure 24 Vac is
present on the red and black leadwires.
쐋Make sure the actuator spring is fully wound and locked
by having power applied for at least 100 seconds.
쐏Connect 24 Vac to the appropriate leadwires (red to
blue or red to yellow). Increase the control signal to
move the damper to the opposite position. The ML9185
should drive the damper.
쐄If the actuator does not run, verify that the actuator is
properly installed for either cw or ccw
rotation.
쐂If the actuator operates in the opposite direction than
desired, reverse the blue and yellow leadwires.
쐆If the actuator is correctly installed but does not run,
replace the actuator.
Controller Checkout
쐃Adjust the setpoint of the controller to call for cooling.
Observe the actuator.
쐇If the damper is closed, it should begin to open.
쐋If the damper remains closed, move the setpoint of the
controller farther below the room temperature.
쐏If the damper still does not move, check for the
presence of 24 Vac in the input.
쐄Make sure the actuator spring is fully wound by having
power applied for at least 100 seconds.
쐂If 24 Vac is present and the actuator does not operate,
reverse the controller leadwires to determine if the
device was miswired.
쐆If the wiring is correct and 24 Vac is present on the
input terminals, but the actuator does not run, replace
the actuator.

ML9185 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR
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ML9185 SPRING RETURN DIRECT COUPLED ROTARY ACTUATOR
63-2494—1 12
63-2494—1 G.R. Rev. 7-96 Printed in U.S.A. www.honeywell.com/building/components
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