???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 50 lb-in. running and spring return torque.

???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.

???88 second synchronous timing can eliminate need for feedback position indication in closed-loop tem- perature control applications.

???Removable splined output hub permits premounting of the hub on the damper shaft, 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 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.

???Standard one-meter cable with color-coded lead- wires allows 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.

???Reversible mounting allows actuator to be used for either clockwise (cw) or counterclockwise (ccw) spring rotation.

???Designed for both single-point and three-point mount- ing, providing installation flexibility.

MODELS: ML6185 Spring Return Direct Coupled Rotary Actuators.

ML6185A: Medium Torque (50 lb-in.) Direct Coupled Rotary Actuator without auxiliary switches and without time-out function.

ML6185C: Medium Torque (50 lb-in.) Direct Coupled Rotary Actuator with two line voltage rated aux- iliary switches, without time-out function.

ML6185D: Medium Torque (50 lb-in.) Direct Coupled Rotary Actuator without auxiliary switches and with time-out function.

ML6185F: Medium 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:

ML6185A-C: 12 VA maximum at 24 Vac.

ML6185D,F: 12 VA maximum at 24 Vac. Auxiliary Switch Ratings: 120, 240 Vac: 3 AFL, 18 ALR,

1A pilot duty.

Control: Standard models include nonplenum UL/ CSA rated, 30V, 60??C, 20 gauge cable.

Auxiliary Switch: UL/CSA rated 300V 90??C, 18 gauge.

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 Driving 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;

100 seconds at -30??F.

Spring Wind Timing (Upon Power Restoration Only): 100 seconds 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 minutes 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 is included with most models.

DIMENSIONS: See Fig. 1.

3/8

5/16

(8)

1-13/32 (36)

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- cation 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 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.

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 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.

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-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 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.

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 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.

INSTALLATION

Installing the Actuator and Mounting Bracket (Single

Point Mounting)

When the direction of the damper shaft rotation is deter- mined (either cw or ccw ), proceed as follows:

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.

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).

Fig. 2???Installing mounting bracket on ML6185 Direct Coupled Actuator.

90 60 30

M9386

Fig. 3???Mounting hub to inside of actuator.

ML6185

INSTALLATION

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.).

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.

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.

60

30

0

DETENT

INSERT

4

ML6185

INSTALLATION

Fig. 6???ML6185 Actuator standard electrical connection.

Fig. 7???ML6185 Actuator can be mounted in

any position. (NOTE: NEMA rating applies only with damper shaft in the horizontal position.)

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 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.

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.

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.

Fig. 8???ML6185 typical wiring diagram.

1POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

2TIME OUT FUNCTION AVAILABLE WITH ML6185D,F MODELS.

M7224

M9384

Fig. 9???ML6185C,F wiring for auxiliary switches.

12??

82??

M7227A

Fig. 10???Common transformer with two controller outputs and two actuators.

Fig. 11???Common transformer with one controller output and two actuators.

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.

IMPORTANT: The ML6185 is designed to respond to instantaneous contact closures from a DDC Con- troller. Be careful not to short cycle the actuator. Unstable damper control may cause premature actua- tor 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. 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 was designed to provide 7500 springreturns; therefore,theactuatorcan be unpowered daily for night shutdown control. However, rapidly cycling the actuator by removing control voltage will lead to premature spring failure.

The ML6185 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 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.

DIRECT CHECKOUT

2.Check the damper position and make sure that 24 Vac is 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.

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.

5.If the actuator does not run, verify that the actuator is

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.

7.If the wiring is correct and 24 Vac is present on the input terminals but the actuator does not run, replace the actuator.