Mounting The Sensor; Sensor Adjustment - LEGRAND Wattstopper DT-205 Installation Instructions Manual

Dual technology low voltage occupancy sensor

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The DT-205 sensors can be mounted to walls or ceilings with the supplied swivel bracket,

and the supplied junction box cover plate if necessary (see figure B). Mounting at fixture

height is most effective.

Ceiling: It is best to leave approximately six inches between the sensor and the wall so

that the Tightening Screw can be easily accessed. Orient the Base Bracket's Half-Circle

Notch in the direction that the sensor will point.

Wall: Orient the Base Bracket's Half-Circle Notch, up.

1. Mount the Base Bracket to the mounting surface with screws.

2. At the center of the Base Bracket, drill a hole in the ceiling or wall (unless mounting

to a junction box) large enough to thread the sensor's wires through.

3. Guide the sensor's wires into the Base Bracket and through the hole in the ceiling or

wall.

4. Connect the sensor to the Base Bracket by angling the Post Bracket so that it is in

line with the half circle notch, as illustrated in figure A. Push the ball into the Base

Bracket opening until it snaps into place, being careful not to pinch the wires. The

brackets can be easily connected or disconnected using this orientation.

5. Insert the Tightening Screw and Nut into the Base Bracket as illustrated.

6. Use the Reference Surface Angle to adjust the sensor for optimum coverage. When

mounted at ten feet, the Reference Surface Angle should be parallel to the wall or the

vertical (see figure C). (As the mounting height decreases, the sensor will be tilted up

slightly; as the mounting height increases, the sensor will be tilted down slightly).

7. Tighten the Tightening Screw.

Sensor Angle Adjustment

While watching the LEDs for flashes (Red LED indicates activation from the PIR sensor;

Green LED indicates activation from the ultrasonic sensor), have a person walk back and

forth at the far end of the space. Increase or decrease mounting angle as needed until the

desired coverage is achieved.

Tighten the Tightening Screw to hold this position.

Service

To override all sensor functions, set the Ultrasonic Sensitivity trimpot to the fully

counterclockwise (Service) position. This bypasses the occupancy control functions of the

sensor, but still allows the lights to be manually controlled with a light switch, if one is installed.

The sensors are factory preset to allow for quick installation in most applications.

Verification of proper wiring or coverage, or customizing the sensor's settings can be

done using the following procedures. To make adjustments, open the Front Cover with

a small screwdriver.

There is a 30-second warm-up period when power is first applied.

Before making adjustments, make sure the office furniture is installed, lighting circuits

are turned on, and the HVAC systems are in the overridden/on position. VAV systems

should be set to their highest airflow. Set the Logic Configuration and Time Delay to

the desired settings. See Logic Configuration Chart.

To Test Occupancy Sensors

1. Ensure the Time Delay is set for Test Mode* using the "Test Mode/20 minutes"

setting. (DIP Switches 1, 2, & 3 are OFF).

2. Ensure that the Ultrasonic Sensitivity trimpot is set to about 70%, clockwise.