1. Introduction
The Wattstopper DT-305 Dual Technology Ceiling Occupancy Sensor combines passive infrared (PIR) and ultrasonic technologies to accurately detect occupancy within a designated area. This sensor is designed for ceiling mounting, offering a 360-degree coverage pattern and a low-profile appearance. It is intended to automatically control lighting or other electrical loads based on room occupancy, contributing to energy savings.
2. Key Features
- Dual Technology Sensing: Utilizes both Passive Infrared (PIR) and Ultrasonic technologies for enhanced occupancy detection and false trigger prevention.
- 360-Degree Coverage: Provides comprehensive coverage from a single ceiling-mounted unit.
- Architecturally Appealing Design: Features a low-profile, unobtrusive appearance that blends with various interior designs.
- Auto Set Functionality: Automatically selects optimal settings for each space, simplifying setup.
- Walk-Through Mode: Increases energy savings potential by turning off lights quickly when occupants briefly pass through an area.
- Ultrasonic Diffusers: Designed to provide more comprehensive coverage.
- Plug Terminal Wiring: Facilitates quick and easy installation.
3. Setup and Installation
Important Safety Information: Installation should be performed by a qualified electrician in accordance with all national and local electrical codes. Turn off power at the circuit breaker before installation to prevent electrical shock.
3.1 Mounting Location
The DT-305 sensor is designed for ceiling mount applications. Choose a central location within the desired coverage area, free from obstructions that could block the sensor's line of sight (for PIR) or ultrasonic waves. Avoid mounting near HVAC vents, direct sunlight, or heat sources that could cause false triggers.
3.2 Wiring
The sensor features plug terminal wiring for simplified connection. Connect the sensor to a compatible power pack (e.g., BZ-50) and the lighting load according to the wiring diagram provided with the power pack and sensor. Ensure all connections are secure.
Figure 1: Wattstopper DT-305 Dual Technology Ceiling Occupancy Sensor. This image shows the white, circular sensor unit designed for ceiling installation.
3.3 Initial Power-Up and Auto Set
After wiring, restore power at the circuit breaker. The sensor will typically enter a warm-up period. The 'Auto Set' feature will automatically begin to optimize settings for the space. Allow sufficient time for the sensor to calibrate.
4. Operating Instructions
The DT-305 sensor operates by detecting both heat signatures (PIR) and motion via ultrasonic waves. When occupancy is detected, the connected lights or loads will activate. When no occupancy is detected for a pre-set time, the loads will deactivate.
4.1 Dual Technology Operation
For the sensor to activate, both PIR and ultrasonic technologies must typically detect occupancy. This dual verification helps to minimize false activations and ensures reliable performance.
4.2 Walk-Through Mode
The Walk-Through Mode is an energy-saving feature. If the sensor detects occupancy for a very short period (e.g., someone walking through a hallway) and then no further occupancy, it will turn off the lights more quickly than the standard time delay, reducing unnecessary energy consumption.
4.3 Adjusting Settings (if applicable)
While the 'Auto Set' feature provides optimal settings, some models may allow for manual adjustments of sensitivity or time delay. Refer to the detailed instructions provided with your specific sensor model for information on accessing and modifying these settings, often via dip switches or a remote control (sold separately).
5. Maintenance
The Wattstopper DT-305 sensor requires minimal maintenance. To ensure optimal performance:
- Cleaning: Periodically wipe the sensor lens and housing with a soft, dry cloth to remove dust or debris. Do not use abrasive cleaners or solvents.
- Obstructions: Ensure that no new furniture, partitions, or other objects are blocking the sensor's view or ultrasonic path.
- Power Cycle: If the sensor appears to be malfunctioning, try turning off the power at the circuit breaker for 30 seconds and then restoring it. This can sometimes reset the device.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Lights do not turn on when entering the room. | No power to sensor; Sensor not detecting motion; Sensor sensitivity too low; Obstruction in coverage area. | Check circuit breaker; Verify wiring connections; Clear obstructions; Adjust sensor sensitivity (if applicable). |
| Lights remain on or turn on unexpectedly. | Sensor detecting minor motion; Sensor sensitivity too high; HVAC drafts; Heat sources; Incorrect time delay setting. | Reduce sensor sensitivity (if applicable); Check for drafts or heat sources; Adjust time delay setting (if applicable). |
| Sensor LED indicator not functioning. | No power to sensor; Faulty sensor. | Check power supply; If power is present, sensor may require replacement. |
If troubleshooting steps do not resolve the issue, contact a qualified electrician or technical support.
7. Specifications
| Specification | Detail |
|---|---|
| Model Number | DT-305 |
| Manufacturer | Lumtopia (Watt Stopper) |
| Item Weight | 1.6 ounces |
| Color | White |
| Power Source | Wired Electric |
| Voltage | 1 Volts (typically low voltage for control, requires power pack) |
| Mounting Type | Ceiling Mount |
| Certification | UL Listed |
| Assembled Diameter | 4.8 Inches |
| Coverage | 360 degrees |
| Technology | Dual Technology (PIR & Ultrasonic) |
8. Warranty Information
Specific warranty details for the Wattstopper DT-305 sensor are not provided in this document. Please refer to the product packaging or the manufacturer's official website for the most current warranty information.
9. Support
For technical assistance, installation questions, or troubleshooting beyond the scope of this manual, please contact Watt Stopper customer support or visit their official website. Contact information is typically available on the product packaging or the manufacturer's website.