Honeywell ML6284 User Manual
ML6284  
Non-Spring Return  
Direct Coupled Damper Actuator  
PRODUCT DATA  
FEATURES  
•
Mounts directly on 3/8 in. to 5/8 in. (10 to 17 mm) round  
and square and 3/4 in. (19 mm) round damper shafts by  
using the appropriate insert. Most models are shipped  
with 1/2 in. insert.  
•
•
Provides 150 lb-in. (17 N•m) running torque.  
Magnetic coupling eliminates the need for mechanical  
stops or limit switch adjustments by limiting stall  
torque to 250 lb-in. (28.3 N•m) maximum.  
•
95° stroke provides necessary compression of  
rubber/neoprene gaskets commonly used on 90° low  
leakage dampers.  
•
•
Manual clutch allows for manual adjustment.  
92-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.  
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.  
APPLICATION  
The ML6284 Non-Spring Return Direct Coupled Damper  
Actuator provides single pole double throw (spdt) floating  
control of dampers in heating, ventilation, and air conditioning  
(HVAC) applications. The actuator has an internal,  
electrically isolated feedback potentiometer that can be used  
to provide indication of the motor output hub position or  
control a slave Series 90 actuator.  
•
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.  
Contents  
Application ........................................................................  
Features ...........................................................................  
Specifications ...................................................................  
POUR COMMANDER ......................................................  
French  
Installation ........................................................................  
Operation ..........................................................................  
Checkout ..........................................................................  
1
1
2
2
4
6
8
® U.S. Registered Trademark  
© 2004 Honeywell International Inc.  
All Rights Reserved  
63-2505  
   
ML6284 NON-SPRING RETURN DIRECT COUPLED DAMPER ACTUATOR  
4 (102)  
3-3/32 (79)  
7/16 (11)  
1-17/32  
(39)  
9/32 (7)  
3 PLACES  
1-1/4  
(32)  
1
8-7/16  
(215)  
7-11/16  
(196)  
1/2  
(12)  
36  
(914)  
1-29/32  
(48)  
13/32 (10)  
5/8 (17)  
3-5/32  
(80)  
1/4 (6)  
2
(51)  
1/8 (3)  
1/4 (6)  
1 (25)  
3/4  
(19)  
7/8 (22)  
1/2  
(13)  
15/16  
(24)  
1/2 (13)  
1-11/16 (43)  
2-1/2 (63)  
1/2 (13)  
3-5/16 (84)  
1
REMOVABLE RETAINING RING FOR  
REMOVAL OF HUB SLEEVE  
4-1/2 (114)  
5 (127)  
M7618B  
6 (152)  
Fig. 1. Approximate dimensions of ML6284 Non-Spring Return Direct Coupled Damper Actuator  
and mounting bracket in in. (mm).  
3
63-2505  
ML6284 NON-SPRING RETURN DIRECT COUPLED DAMPER ACTUATOR  
Environmental Protection Ratings: NEMA1 standard with  
Install the actuator in a location that allows enough clearance  
for mounting accessories and for servicing.  
damper shaft in horizontal position.  
Accessories:  
Mounting  
205617 Hub Insert, 3/4 in. round.  
205753 Hub Insert, 3/8 in.  
205758 Hub Insert, 5/8 in.  
205820A 3-Point Mounting Kit.  
205685 Crank-Arm Accessory.  
205850B End Stop Kit.  
The ML6284 Non-Spring Return Direct Coupled Damper  
Actuator is designed to operate a damper by driving the  
damper shaft either cw  
damper design. All actuators are shipped in the fully closed  
position.  
or ccw  
depending on  
The ML6284 Non-Spring Return Direct Coupled Damper  
Actuator is designed with removable hub inserts 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 ML6284  
Actuators are shipped with a 1/2 in. hub insert. For field use,  
two hub insert sizes are available. See the Accessories listing  
in the Specifications section. Shaft sizes are stamped on the  
inserts.  
INSTALLATION  
When Installing this Product…  
1. Read instructions carefully. Failure to follow them could  
damage the product or cause a hazardous condition.  
2. Check ratings and description given in the specifications  
to make sure the product is suitable for your application.  
3. Installer must be a trained, experienced service  
technician.  
The ML6284 Non-Spring Return Direct Coupled Damper  
Actuator is designed for single-point mounting when using a  
mounting bracket. Single-point mounting is typically used  
when the actuator is mounted on the damper shaft.  
4. After installation is complete, check out product  
operation as provided in these instructions.  
The ML6284 Non-Spring Return Direct Coupled Damper  
Actuator can be mounted directly on the damper shaft with the  
actuator in any position.  
WARNING  
Electrical Shock Hazard.  
Can cause severe injury, death or property  
damage.  
Disconnect power before installation to prevent  
electrical shock or equipment damage.  
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 allow the bracket tab to be centered in the actuator  
slot.  
CAUTION  
Can cause equipment damage or failure.  
1. Never turn motor output hub by hand or wrench.  
2. Do not install actuator in areas with acid fumes or  
other deteriorating vapors that might attack the  
metal parts of the actuator.  
CAUTION  
Improper mounting can damage the equipment or  
Equipment Damage Hazard.  
Equipment Damage Hazard.  
interfere with proper operation.  
The mounting bracket must not bind or clamp the  
actuator to the duct. The mounting bracket only  
prevents the actuator housing from rotating.  
The ML6284 Direct Coupled Damper 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 2.5 in. (64 mm) long, or for ease of mounting,  
the output hub may be mounted to the back of the actuator  
gear housing. See Fig. 3. Be careful when removing the  
retaining ring which secures the output hub sleeve to the  
actuator housing. Use a flat headed screwdriver to pry the  
retaining ring loose.  
WARNING  
Can cause severe injury, death or property  
damage.  
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.  
Fire or Explosion Hazard.  
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.  
63-2505  
4
 
ML6284 NON-SPRING RETURN DIRECT COUPLED DAMPER ACTUATOR  
Installation  
Installing Actuator and Mounting Bracket  
(Single Point Mounting)  
1. Place the ML6284 Non-Spring Return Direct Coupled  
Damper 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 so  
the bracket tab is midway in the actuator slot. 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 mounting  
bracket screws (or use no.10 self-tapping sheet metal  
screws—not supplied).  
6. Place the actuator and mounting bracket back into  
position over the damper shaft and install the mounting  
bracket screws.  
7. Move damper shaft either fully clockwise  
counterclockwise  
8. Fully depress and hold disengage button while moving  
the actuator hub either fully clockwise or fully  
counterclockwise to match the damper shaft.  
or fully  
.
ACTUATOR  
SLOT  
Release disengage button.  
9. Tighten the two 8 mm by 12 mm long set screws firmly  
against the damper shaft (maximum tightening torque is  
100 lb-in.).  
M7876  
Wiring  
Fig. 2. Installing mounting bracket on ML6284 Non-Spring  
Return Direct Coupled Damper Actuator. NOTE: Install  
mounting bracket so mounting bracket tab is centered in  
actuator slot.  
WARNING  
Electrical Shock Hazard.  
Can cause severe injury, death or property  
damage.  
Disconnect power supply before wiring to prevent  
A typical actuator mechanical connection is shown in Fig. 4;  
wiring diagrams in Fig. 5 through 10.  
electrical shock or equipment damage.  
The ML6284 Non-Spring Return Direct Coupled Damper  
Actuator can also be three-point mounted using the two front  
gear housing slots and the adapter bracket. Two screws are  
secured through the two front gear housing slots and the  
adapter bracket positioned 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.  
All wiring must comply with local electrical codes, ordinances  
and regulations. The ML6284 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. Standard electrical connection  
is shown in Fig. 4. See Fig. 5 and 6 for typical wiring  
connections.  
The ML6284 has a plastic housing with two taped holes on  
the end of the device for 1/2 in. conduit fittings.  
CAUTION  
Equipment Damage Hazard.  
Improper mounting will damage the actuator.  
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.  
ML6284 Models with Factory-mounted Auxiliary Switches  
(See Fig. 7)  
ML6284C,F models have two nonadjustable low voltage rated  
spdt auxiliary switches that are factory set to make common to  
normally open at 12° and 82° rotation from the closed  
counter-clockwise stop. See Fig. 7.  
Preparation  
Before installing the ML6284 on the damper shaft, determine  
the opening direction of the damper shaft (see Fig. 2) to  
correctly connect the wiring.  
5
63-2505  
ML6284 NON-SPRING RETURN DIRECT COUPLED DAMPER ACTUATOR  
RETAINING  
RING  
60  
30  
90  
DETENT  
INSERT  
60  
30  
0
POSITION  
INDICATOR  
12  
INDICATOR  
DETENTS  
1 2  
HUB  
SLEEVE  
HUB  
INSERTS  
DISENGAGE  
BUTTON  
M7875  
Fig. 3. Mounting hub to inside of actuator.  
IMPORTANT  
Actuators driving in parallel may not be synchronized  
IMPORTANT  
The ML6284 can operate with DDC controller that  
emulates an spdt break-before-make switch. Do not  
short-cycle the actuator. Short-cycling of the actuator  
can cause premature failure.  
with each other. In normal operation, when all  
actuators are driven to the fully open or fully closed  
position, the actuators are again synchronized.  
The actuator has a position indicator to show 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 position indication. The indicator can be  
indexed to show cw or ccw open or closed, using the detents  
that are 90° apart. See Fig. 3.  
OPERATION  
The ML6284 Non-Spring Return Direct Coupled Damper  
Actuator is designed to be used in ventilating and air  
conditioning installations to operate dampers, ventilation flaps  
and louvers requiring up to 150 lb-in. torque.  
The ML6284D and ML6284F models provide a time-out  
function that removes power from the actuator submotor if the  
actuator remains in the fully open or fully closed position for  
longer than a nominal five minutes. This time-out function  
helps to extend actuator life.  
The ML6284 Non-Spring Return Direct Coupled Damper  
Actuator is operated by an spdt floating controller. When using  
an spdt floating controller, the actuator is driven toward its fully  
open (clockwise  
) position when the controller makes B  
contact and toward the fully closed (counterclockwise  
)
position when the controller makes W contact. It stops when  
neither contact is made.  
63-2505  
6
 
ML6284 NON-SPRING RETURN DIRECT COUPLED DAMPER ACTUATOR  
ML6284  
B
BLUE  
MOTOR  
W
YELLOW  
2
1
TIME OUT  
T2  
L1  
(HOT)  
RED  
T1  
24 VAC  
L2  
BLACK  
0
6
0
3
0
9
TAN  
3
0
6
GREEN (CLOSED)  
ORANGE (OPEN)  
0
3
12  
0
1 2  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
2
3
TIME OUT FUNCTION AVAILABLE WITH ML6284D,F MODELS.  
M4884A  
500 OHM POTENTIOMETER.  
Fig. 6. ML6284D,F typical wiring diagram.  
COMMON  
WHITE/RED  
12  
NO  
WHITE/BLUE  
INTERNAL  
AUXILIARY  
SWITCH  
NC  
WHITE/YELLOW  
BLACK/RED  
COMMON  
82  
3A, 24 VAC  
NO  
NC  
BLACK/BLUE  
BLACK/YELLOW  
M7877A  
SWITCHES SHOWN AT ACTUATOR (CCW)  
CLOSED POSITION.  
TO JUNCTION  
BOX (UP TO  
3 FT AWAY)  
MOUNTING  
BRACKET  
Fig. 7. ML6284 Actuator wiring for auxiliary switches.  
M7874  
ML6284A,C  
Fig. 4. ML6284 Actuator typical mechanical connection.  
CONTROLLER  
BLUE  
YELLOW  
ML6284A,C  
1
B
L1  
(HOT)  
BLUE  
BLACK  
MOTOR  
L2  
1
W
L1  
(HOT)  
YELLOW  
24 VAC  
T1 BLACK  
ML6284A,C  
L2  
TAN  
2
CONTROLLER  
BLUE  
GREEN (CLOSED)  
ORANGE (OPEN)  
YELLOW  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
BLACK  
M4883A  
500 OHM POTENTIOMETER.  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
M4885A  
Fig. 5. ML6284A,C typical wiring diagram.  
Fig. 8. Common transformer with two controller outputs  
and two ML6284A,C actuators.  
7
63-2505  
ML6284 NON-SPRING RETURN DIRECT COUPLED DAMPER ACTUATOR  
3. Apply 24 Vac control signal to blue (B) lead with respect  
to black (T1) lead (see Fig. 5). Actuator should drive  
damper open.  
ML6284D,F  
CONTROLLER  
4. Apply 24 Vac control signal to yellow (W) lead with  
respect to black (T1) lead (see Fig. 5). Actuator should  
drive damper closed.  
BLUE  
YELLOW  
1
RED  
5. If 24 Vac control signal is removed, actuator should  
L1  
(HOT)  
BLACK  
stop.  
L2  
ML6284D,F  
TROUBLESHOOTING  
CONTROLLER  
BLUE  
Perform the following troubleshooting steps if the actuator  
does not drive, travel full stroke, or operate properly during the  
checkout.  
YELLOW  
RED  
BLACK  
NOTE: Perform these steps before replacing the actuator.  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
M4886A  
1. Check the actuator label to verify that proper power and  
control signal requirements have been met.  
2. Check for 24 Vac at actuator black (T1), yellow (W) or  
blue (B), and red (T2) [if actuator has time-out function]  
leads when the actuator should be driving. If the voltage  
is not present or is low, check power supply and  
controller.  
Fig. 9. Common transformer with two controller outputs  
and two ML6284D,F actuators.  
ML6284A,C  
3. If the actuator does not drive in the correct direction  
when a control signal is applied, reverse the yellow and  
blue wires.  
CONTROLLER  
BLUE  
YELLOW  
4. Remove power and fully depress and hold disengage  
1
L1  
(HOT)  
button down while turning damper shaft clockwise  
BLACK  
and counterclockwise  
. If the damper shaft turns  
L2  
freely through the entire 90¡ stroke and the actuator is  
installed correctly, replace the actuator.  
ML6284A,C  
5. If the damper shaft will not turn freely for the full 90°  
check for any bind and make sure the actuator is loose  
on the mounting bracket. If necessary, adjust mounting  
bracket to prevent binding.  
BLUE  
YELLOW  
6. If no binding is noticed in the actuator and damper  
assembly, remove the actuator and turn the damper  
BLACK  
shaft clockwise  
and counterclockwise  
. If  
the damper does not turn freely, repair or replace the  
damper.  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
M4887A  
7. If the damper turns, fully depress and hold the actuator  
disengage button down and turn the actuator hub  
Fig. 10. Common transformer with one controller output  
and two ML6284A,C actuators.  
clockwise  
and counterclockwise  
. If the  
actuator hub does not turn, replace the actuator.  
8. If the actuator and damper turn freely, remount the  
actuator to the damper in accordance with the  
CHECKOUT  
instructions in the Installation section. Make sure the  
actuator and mounting bracket do not bind. Make sure  
the actuator and damper are both at the same end stop  
Perform the following steps to checkout the ML6284  
Non-Spring Return Direct Coupled Damper Actuator.  
(clockwise  
or counterclockwise  
) when they  
are assembled. Hook up the wires and repeat the  
checkout. Troubleshoot again, if necessary.  
1. Check the actuator position indicator and the damper  
shaft position to see that they agree.  
2. If the actuator has time-out function, apply 24 Vac to  
black (T1) lead and red (T2) lead. See Fig. 5.  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
Golden Valley, MN 55422  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
Scarborough, Ontario  
M1V 4Z9  
63-2505 G.R. 06-04  
www.honeywell.com  
   

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