Description
Philips Dynalite OccuSwitch Classic Mult-Tech Ceiling Mount Sensors, 360˚ Coverage, High to Low Motion Sensitivity, Passive Infrared (PIR) ans Ultra-Sonic, Low Voltage 24VDC (use Power Pack 120-277V line)
Philips Dynalite OccuSwitch LRM2255 Dual-Technology Ceiling Sensor Guide
Quick Answer: The Philips OccuSwitch LRM2255 (Dynalite / Signify) is an advanced dual-technology ceiling-mount occupancy sensor combining Passive Infrared (PIR) and Ultrasonic (US) detection with integrated daylight-harvesting photocell control. LRM2255 offers extended volumetric sensing up to 2,000 sq ft, advanced manual/auto-on operational modes, and parallel interconnectivity, preventing false triggering in open-plan offices, partitioned classrooms, and large commercial conference facilities.
Philips OccuSwitch LRM2255 Overview & Key Features
The Philips OccuSwitch LRM2255 commercial sensor delivers precision presence detection and automated energy compliance across complex interior layouts:
- Dual-Technology PIR & Ultrasonic Detection: Uses PIR optics for major motion acquisition and 32 kHz active ultrasonic wave analysis to capture micro-motions (such as keyboard typing, phone calls, or reading) around cubicle partitions and obstructions.
- Self-Contained Line Voltage Switching: Operates directly on 24VDC low voltage power with an internal 16A zero-crossing relay rated for high-inrush LED drivers and electronic ballasts without requiring an external power pack.
- Integrated Daylight Hold-Off Photocell: Continuous ambient daylight evaluation prevents the lighting load from switching on if natural light levels exceed the user-calibrated lux setpoint.
- Extended Commercial Coverage: Provides full 360-degree detection covering up to 2,000 sq ft at standard ceiling heights (8–12 ft).
- Intelligent Adaptive Time Delay: Incorporates automatic self-adjusting delay logic that learns usage patterns over time to minimize unnecessary lamp cycling while maximizing energy conservation.
- Parallel Interconnect Capability: Allows multiple OccuSwitch units to be linked in parallel on the same branch circuit to control larger open suites or irregularly shaped rooms.
Philips OccuSwitch LRM2255 Technical Specifications
Core electrical parameters, detection ratings, and performance standards for the Philips OccuSwitch LRM2255:
| Specification Parameter | Rating / Value | Details & Performance Standards |
|---|---|---|
| Operating Line Voltage | 24VDC | Low Voltage |
| Detection Technology | Dual-Tech: PIR + Ultrasonic (32 kHz) | Infrared line-of-sight plus volumetric wave reflection |
| Relay Contact Rating | 16A Electronic / Ballast / LED | Heavy-duty relay with zero-cross switching protection |
| Coverage Pattern | 360° / Up to 2,000 sq ft | Large volumetric coverage at 8–12 ft mounting height |
| Daylight Sensor Range | 100 to 1,000 Lux | Adjustable ambient light hold-off threshold |
| Time Delay Selection | 1 to 30 Minutes + Auto-Adapt | Manual dial setting with dynamic intelligent mode |
| Mounting Style | Ceiling Flush / Junction Box | Direct mount to standard 4" octagonal or square box |
| Operating Temperature | 32°F to 104°F (0°C to 40°C) | Commercial indoor rated |
| Compliance & Certifications | UL Listed, CE, RoHS | ASHRAE 90.1, IECC, and California Title 24 compliant |
Installation & Wiring Guidelines
- Power Isolation: Always isolate electrical power at the main distribution panel prior to servicing, wiring, or mounting the unit.
- Terminal Wiring: Connect incoming AC Line (120–277V) to the Line terminal, system Neutral to the Neutral terminal, and the switched output lead to the lighting load terminal according to the wiring diagram.
- Ceiling Placement: Position centrally in the monitored area. To avoid nuisance triggering from air turbulence, place the sensor a minimum of 4 to 6 feet away from HVAC supply ducts and ceiling air diffusers.
- Commissioning & Calibration: Adjust the ultrasonic sensitivity so detection covers the boundaries of the room without bleeding into exterior hallways, and set the daylight threshold during typical working hours when target light levels are achieved.
Frequently Asked Questions
What is the difference between the OccuSwitch LRM2250 and LRM2255?
While both units feature PIR sensing and the LRM2255 also used ultrasonic provides an expanded volumetric coverage profile (up to 2,000 sq ft) and enhanced adaptive control algorithms tailored for larger open-plan offices and divided commercial spaces.
Does the LRM2255 require a separate auxiliary power pack?
No. The LRM2255 is completely self-contained with an internal power supply and a heavy-duty 16A switching relay, accepting direct 120–277V line-voltage connections without external power modules.
Can multiple LRM2255 sensors be wired to control the same lighting zone?
Yes. Up to 10 OccuSwitch sensors can be interconnected in parallel on the same circuit, allowing any single sensor to maintain the lighting circuit on when occupancy is detected in any portion of the space.
Spec Sheets
Download the official manufacturer documentation and specifications:
Philips Dynalite LRM2255 Brochure / Specification Sheet
Additional Information
Our Part No: |
BSF-PHLPS-LRM2255 |
Mfr Part #: |
LRM2255/00 |
Manufacturer Material Code: |
912400474167 |
Brand: |
Philips DynaLite OccuSwitch |
Sensor Type: |
Occupancy, Vacancy |
Input Voltage: |
24V |
Coverage Type: |
Ceiling |
Detection Type: |
Passive Infrared (PIR) and Ultra-Sonic |
Color: |
White |
Product Data Sheet: |
See PDF Link Provided |
Dimensions: |
4.5” Dia x 1.5” H |
Features: |
Single mounting post and three color-coded wires |
Warranty: |
Manufacturer's |
Case Size: |
ea |
