9
63-2483—2
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.
To make sure proper phasing occurs, connect all four
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.
Fig. 11—Common transformer with one
controller output and two actuators.
Fig. 10—Common transformer with two
controller outputs and two actuators.
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
spring returns; therefore, the actuator can be unpowered
daily for night shutdown control. However, rapidly
cycling the actuator by removing control voltage will
lead to premature spring failure.
Operation
L1
(HOT)
L2
1
1
BLUE
YELLOW
RED
BLACK
ML6185
BLUE
YELLOW
RED
BLACK
ML6185
M7225A
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
CONTROLLER
CONTROLLER
R
B
W
R
B
W
L1
(HOT)
L2
1
1
BLUE
YELLOW
RED
BLACK
ML6185
BLUE
YELLOW
RED
BLACK
ML6185
M7226A
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
CONTROLLER
R
B
W
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
