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ACTUATOR
SLOT
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.
A typical actuator mechanical connection is shown in Fig. 4;
wiring diagrams in Fig. 5 through 10.
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.
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.
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.
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
counterclockwise
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
WARNING
Electrical Shock Hazard.
Can cause severe injury, death or property
damage.
Disconnect power supply before wiring to prevent
electrical shock or equipment damage.
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.
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.
5
or fully
.
or fully
to match the damper shaft.
63-2505
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