Wattstopper DT-205 Dual Technology Occupancy Sensor

Specifications

Description and Operation

The Wattstopper DT-205 Dual Technology occupancy sensors combine advanced passive infrared (PIR) and ultrasonic technologies into one unit. This combination helps eliminate false triggering problems even in difficult applications. The DT-205 turns lighting systems on and off based on occupancy, offering numerous operating modes for custom control. Sensors can be configured to turn lighting on and hold it as long as either or both technologies detect occupancy. After no movement is detected for the set time delay (30 seconds to 30 minutes), lights switch off. A "walk-through" mode can turn lights off after 3 minutes if no activity is detected within 30 seconds of an occupancy detection. The DT-205 operates on 24VDC supplied by Wattstopper Power Packs.

Coverage Pattern

The DT-205 provides an elliptical coverage pattern. The coverage shown represents walking motion at a mounting height of 10 feet. For building spaces with lower levels of activity or with obstacles and barriers, coverage size may decrease.

The diagram illustrates the sensor's detection zones. PIR coverage extends up to 55 feet (16.76 m), and ultrasonic coverage extends up to 38 feet (11.58 m). The dense wide-angle lens offers coverage up to 2000 sq ft for walking motion and up to 1000 sq ft for desktop motion.

Placement Guidelines

Consider obstacles like furniture or partitions, which may affect actual coverage distances. It is recommended to place the sensor 4 to 6 feet away from air supply ducts. The DT-205 is designed for a ceiling height of approximately 8-10 feet; mounting outside this range will significantly affect coverage patterns. Generally, each occupant should be able to clearly view the sensor.

Masking the PIR Lens: Opaque adhesive tape is supplied to mask sections of the PIR lens, restricting its view to eliminate coverage in unwanted areas such as hallways. Masking affects coverage bands, so consider this during troubleshooting. Ultrasonic coverage cannot be masked but can be adjusted via sensitivity to reduce the coverage area.

Wiring Directions

Each Wattstopper B347-D power pack can supply power for up to 2 DT-205 sensors. Wattstopper BZ series power packs can supply power for 3 DT-205 sensors. Multiple power packs are required for more than 14 sensors.

Low Voltage Connections:

• Connect the RED wire (+24VDC) from the power pack to the sensor's RED wire.
• Connect the BLACK wire (Return) from the power pack to the sensor's BLACK wire.

Single Lighting Load Connection:

• Connect the BLUE wire from the power pack to the sensor's BLUE wire.

Manual Switch Connection (e.g., LVS-1 Momentary Toggle Switch):

• Connect one side of the switch to the sensor's GRAY wire.
• Connect the other side of the switch to the sensor's RED wire.

The wiring diagrams show connections for BZ-200 and BZ-250 power packs with the DT-205 sensor, including optional manual switch configurations. Ensure power is OFF at the circuit breaker before wiring.

Mounting the Sensor

Sensors can be mounted to walls or ceilings using the supplied swivel bracket and junction box cover plate. Mounting at fixture height is most effective.

Ceiling Mount: Leave approximately six inches between the sensor and the wall for easy access to the tightening screw. Orient the Base Bracket's Half-Circle Notch in the direction the sensor should point.

Wall Mount: Orient the Base Bracket's Half-Circle Notch upwards.

Installation Steps:

1. Mount the Base Bracket to the surface with screws.
2. Drill a hole in the ceiling or wall (large enough for wires) at the center of the Base Bracket, unless mounting to a junction box.
3. Guide sensor wires through the Base Bracket and the hole.
4. Connect the sensor to the Base Bracket by aligning the Post Bracket with the half-circle notch. Push the ball into the opening until it snaps into place, being careful not to pinch wires.
5. Insert the Tightening Screw and Nut into the Base Bracket.
6. Use the Reference Surface Angle to adjust for optimum coverage. At 10 feet mounting height, the angle should be parallel to the wall or vertical. Adjustments for lower/higher mounting heights are described.
7. Tighten the Tightening Screw.

Sensor Angle Adjustment: While observing the PIR (red LED) and ultrasonic (green LED) activity, have someone walk back and forth in the coverage area. Adjust the mounting angle as needed until desired coverage is achieved. Tighten the screw to hold the position.

Service: To override all sensor functions, set the Ultrasonic Sensitivity trimpot fully counterclockwise. This bypasses occupancy control but allows manual light control via a switch.

Junction Box Cover Plate Installation: Wattstopper recommends using a 3.0" mudring with a 4" octagonal box.

Sensor Adjustment

Sensors are factory preset for quick installation. Verify wiring or coverage, or customize settings by following these procedures. Open the front cover with a small screwdriver.

There is a 30-second warm-up period when power is first applied. Before adjustments, ensure furniture is installed, lighting circuits are on, and HVAC systems are in the overridden/on position. Set VAV systems to highest airflow. Set Logic Configuration and Time Delay to desired settings.

To Test Occupancy Sensors:

1. Set Time Delay to "Test Mode/20 minutes" (DIP Switches 1, 2, & 3 OFF).
2. Set Ultrasonic Sensitivity trimpot to approximately 70% clockwise.
3. Remain still: LEDs should not flash. Lights should turn OFF after 5 seconds. (Refer to Troubleshooting if not.)
4. Move within the coverage area: Lights should turn ON. Adjust Ultrasonic Sensitivity as needed for desired coverage (Green LED indicates ultrasonic activation).

After testing and adjustment, reset DIP Switches and lighting levels to desired settings, and replace the sensor cover.

*Test Mode is a temporary state. Setting DIP Switches 1, 2, 3 to OFF initiates Test Mode/20 minutes. To re-initiate Test Mode if switches are already set, toggle DIP Switch 1 ON then OFF. This provides a 10-minute test period with a 5-second time delay.

DIP Switch Setting

Time Delay (Switches 1, 2, 3): Sensor holds lights ON during occupancy. Countdown starts when no motion is detected. Lights turn OFF after the delay period.

Walk-through (Switch 4): Turns lights OFF 3 minutes after initial occupancy if no motion is detected in the first 30 seconds. If motion continues beyond 30 seconds, the selected time delay applies.

PIR Sensitivity (Switch 5): Minimum reduces PIR detection range. Maximum automatically selects maximum sensitivity for reliable operation without false detection.

Occupancy Logic (Switches 6, 7, 8): Provides 8 logic configurations for occupancy triggers. Determine the appropriate option using the Trigger matrix and set DIP switches accordingly.

• Initial Occupancy: Method to change from "Standby" to "Occupied". Options include "Both" (PIR & Ultrasonic), "Either" (one technology), "PIR" (PIR only), or "Man." (Manual Switch activation).
• Maintain Occupancy: Indicates the area is still occupied, keeping lights ON.
• Re-trigger: After time delay and lights turn OFF, detection within the indicated seconds turns lights back ON.

● = ON, ○ = OFF. ○○○ indicates factory setting.

Manual ON Function

The Manual ON function is enabled by installing a momentary switch (e.g., Wattstopper LVSW-101) connected to the sensor's "Man." Switch and +24VDC terminals. Each press changes the load state. Sensor operation relative to the manual switch is determined by DIP Switch settings for Occupancy Logic.

Manual Mode (Trigger Options 6 or 7): The switch is required to turn the load ON. The sensor keeps the load ON based on occupant activity. After the time delay, if no movement is detected within the 30-second re-trigger period, the load turns OFF and must be turned ON again via the manual switch.

Automatic Mode (Options other than 6 or 7): These options use occupancy triggers and switch activation to turn the load ON. A manual switch offers additional functionality: the load can be turned ON by the switch and stays on per the occupancy logic setting. The time delay operates as programmed. When the load turns OFF due to lack of occupancy, it can be turned ON again by occupancy detection or the switch. Activating the manual switch while the load is ON turns the load OFF.

• If the load is turned OFF manually, it stays OFF as long as the sensor detects occupancy. After the time delay expires following the last occupancy detection, lights remain OFF, and the sensor reverts to automatic-on mode.
• If the load is turned OFF manually, pressing the switch again turns the load ON and the sensor reverts to automatic-on mode.
• Once back in automatic-on mode, the load can be turned ON by the switch or by occupancy detection.

Overload Protection

The sensor has built-in overload protection that automatically turns OFF the control output if load current exceeds 200mA. The sensor LEDs will blink rapidly (~10Hz) to indicate an overload condition. The control output returns to normal when the load current is corrected.

Troubleshooting

For any unexpected operation:

1. Verify DIP Switch settings according to the chart.

Lights do not turn on when entering the room:

• Neither LED Flashes: Check circuit breaker, all wire connections (sensor and power pack). Verify 24VDC input to the sensor (red/black wires). If 24VDC is present, replace the sensor. If not, check high-voltage connections to the power pack. If high-voltage connections are good, replace the power pack.
• Red LED does not flash: Allow 30-60 seconds warm-up. Ensure PIR sensitivity is set to 100% (DIP switch #5 OFF).
• Green LED does not flash: Increase ultrasonic sensitivity by turning the trimpot clockwise until the LED flashes with movement.
• Green LED is on steady: Check ultrasonic sensitivity trimpot. Fully counterclockwise is override. Turn clockwise until LED flashes only with movement in the desired area.
• Red and Green LEDs flash: Check all connections. Verify 24VDC at the power pack's blue/black wires to the sensor. If no voltage, replace sensor. If voltage is present, check blue/black wires at power pack; if 24VDC is present and relay doesn't close, replace power pack. If no 24VDC, check for a break in low-voltage wiring.
• LEDs flashing rapidly (~10Hz): Overload condition. Correct the issue; sensor will return to normal. Check blue wire connection; replace power pack if necessary.

Lights do not turn off automatically:

• Green LED flashes: Reduce ultrasonic sensitivity by turning the adjustment pot counter-clockwise until it only flashes with movement.
• Red LED flashes briefly, Green LED does not flash: Check manual switch connection. Do not connect anything to this terminal if not using a low-voltage momentary switch.
• Red LED randomly flashes: Set PIR sensitivity to minimum (DIP switch 5 ON).
• Lights do not turn off: Check all connections. Disconnect blue wire from power pack. If lights stay on, check power pack wiring and replace if necessary. If lights turn off, the issue is likely the sensor or wiring between sensor and power pack. Reconnect blue wire. Set sensitivity and time delay to minimum and allow sensor to time out. If lights turn off, sensor is working; adjust sensitivity/delay. If lights stay on, check wiring; if correct, replace sensor.

Ordering Information

Warranty Information

Wattstopper warrants its products to be free of defects in materials and workmanship for a period of five (5) years. Wattstopper is not liable for consequential damages arising from the use or performance of this product.