System Sensor P2RLED-P LED Horn Strobe

The System Sensor P2RLED-P LED Horn Strobe is a red, wall-mounted audible/visual notification appliance from the L-Series with LED family. It combines a high-output horn with an energy-efficient LED strobe in a two-wire design for fire alarm and life-safety notification systems. The “-P” designation identifies the plain housing version with no “FIRE” marking on the cover.

The P2RLED-P uses LED strobe technology to reduce current draw compared with earlier Xenon-based notification appliances. It provides multiple field-selectable candela settings, selectable horn tone and volume options, a plug-in mounting design, and compatibility with the System Sensor synchronization protocol.

Product Functions

• Provides combined audible and visual life-safety notification
• Uses LED strobe technology for reduced current draw
• Red wall-mount housing
• Plain front cover with no “FIRE” lettering
• Uses two-wire horn/strobe operation
• Operates from regulated 24 VDC notification appliance circuits
• Provides seven field-selectable candela settings
• Supports selectable Temporal 3 and non-temporal horn patterns
• Provides high and low volume selections
• Supports 3.1 kHz horn tone options
• Uses rotary switches for candela, tone, and volume selection
• Supports System Sensor synchronization
• Electrically compatible with legacy SpectrAlert, SpectrAlert Advance, and L-Series notification appliances
• Includes DVM diagnostic voltage test points
• Uses a plug-in mounting plate
• Includes onboard shorting springs for circuit continuity testing
• Provides tamper-resistant construction
• Designed for indoor applications
• Supports standard wall-mount electrical boxes

LED Horn Strobe Operation

The P2RLED-P combines an audible horn and a visual LED strobe in a single notification appliance.

When the connected Notification Appliance Circuit activates, the device produces the selected audible horn pattern while the strobe flashes to provide visual notification. The LED platform significantly reduces strobe current requirements compared with traditional Xenon technology, which can help increase the number of appliances supported on a NAC or reduce supplemental power supply requirements.

The horn and strobe operate from the same two-wire circuit, simplifying field wiring where simultaneous audible and visual activation is required.

Plain Housing

The P2RLED-P is specifically the plain-cover version of the red P2RLED horn strobe.

System Sensor identifies the model as:

P2RLED-P — 2-Wire, Horn Strobe, Wall, Red, Plain

All “-P” models have a plain housing with no “FIRE” marking on the cover.

This configuration can be useful in applications where standard fire lettering is not desired or where alternate identification is provided by system design, signage, or other requirements.

Selectable Candela

The P2RLED-P provides seven field-selectable wall-mount strobe intensities:

• 15 candela
• 30 candela
• 75 candela
• 95 candela
• 110 candela
• 135 candela
• 185 candela

Candela output is selected using a rotary switch on the appliance. The selected setting can be viewed through the candela window on the front of the device.

The correct candela setting should be determined from the approved fire alarm design, room dimensions, mounting location, notification requirements, and applicable codes.

Horn Tone & Volume Selection

The P2RLED-P provides eight field-selectable horn tone and volume combinations.

Available settings include:

• Temporal 3 – High
• Temporal 3 – Low
• Non-Temporal – High
• Non-Temporal – Low
• 3.1 kHz Temporal 3 – High
• 3.1 kHz Temporal 3 – Low
• 3.1 kHz Non-Temporal – High
• 3.1 kHz Non-Temporal – Low

The horn output ranges from approximately 79 to 87 dBA, depending on the selected tone and volume setting under the manufacturer’s specified test conditions.

The selection is made using a rotary switch on the rear of the appliance.

Temporal 3 Signaling

The P2RLED-P supports the standardized Temporal 3 evacuation pattern used for fire alarm notification.

Temporal 3 provides a repeating three-pulse audible pattern designed to distinguish fire alarm evacuation signaling from other audible signals. System Sensor also provides non-temporal continuous horn settings for applications where a different signaling pattern is required.

System Sensor Synchronization

The P2RLED-P is compatible with the System Sensor synchronization protocol.

Synchronization can be provided through:

• A compatible fire alarm control panel NAC
• A compatible power supply capable of System Sensor Sync
• A System Sensor MDL3 synchronization module

Synchronization allows compatible strobes to flash together and coordinated horns to produce synchronized signaling where required.

DVM Diagnostic Test Points

The L-Series LED horn strobes include Digital Voltage Meter (DVM) diagnostic test points on the appliance face.

These test points allow technicians to measure device voltage without removing the notification appliance from the wall. This can simplify troubleshooting and end-of-line voltage verification while reducing unnecessary removal and handling of the device.

Electrical Specifications

The P2RLED-P electrical specifications include:

Nominal Voltage: Regulated 24 VDC
Operating Voltage Range: 16–33 VDC
Strobe Flash Rate: 1 flash per second
Input Wire Gauge: 12–18 AWG
Horn/Strobe Circuit: Two-wire
Wall Candela Settings: 15, 30, 75, 95, 110, 135, 185 cd
Maximum Strobe Current at 15 cd: 18 mA
Maximum Strobe Current at 30 cd: 22 mA
Maximum Strobe Current at 75 cd: 70 mA
Maximum Strobe Current at 95 cd: 75 mA
Maximum Strobe Current at 110 cd: 85 mA
Maximum Strobe Current at 135 cd: 105 mA
Maximum Strobe Current at 185 cd: 120 mA

Actual horn/strobe current draw depends on the selected candela, horn tone, and volume setting and should be calculated using the manufacturer’s current tables when determining NAC loading.

Physical Dimensions

The P2RLED-P uses the standard L-Series LED wall horn/strobe housing.

Height: 5.67 in / 144 mm
Width: 4.70 in / 119.4 mm
Depth: 2.07 in / 52.6 mm
Color: Red
Mounting: Wall
Housing Marking: Plain / No “FIRE” marking

With the compatible SBBRL surface-mount backbox installed, the assembly measures approximately:

Height: 5.77 in / 146.7 mm
Width: 4.82 in / 122.3 mm
Depth: 3.92 in / 99.6 mm

Environmental Specifications

The P2RLED-P is intended for indoor applications.

Operating Temperature: 32°F to 120°F / 0°C to 49°C
Relative Humidity: 10% to 93%, non-condensing
Environment: Indoor
Nominal Voltage: 24 VDC
Operating Range: 16–33 VDC

The device should not be used in outdoor or weather-exposed locations unless a specifically listed outdoor notification appliance is selected.

Installation Information

The P2RLED-P uses a plug-in mounting plate designed to simplify field installation.

Supported mounting boxes for the standard two-wire wall appliance include:

• 4 × 4 × 1.5-inch electrical box
• Single-gang box
• Double-gang box
• 4-inch octagonal box
• SBBRL red surface-mount backbox

Typical installation includes:

• Connecting the notification appliance circuit wiring
• Maintaining correct polarity
• Selecting the required candela
• Selecting the horn tone
• Selecting high or low horn volume
• Testing wiring continuity using the mounting plate shorting spring
• Installing the appliance onto the mounting plate
• Verifying operating voltage
• Confirming System Sensor synchronization where required
• Performing audible and visual functional testing

The plug-in design allows wiring to be completed and tested before the appliance itself is installed, helping protect the horn strobe during construction.

Legacy Compatibility

The P2RLED-P is electrically compatible with previous System Sensor notification appliance generations, including:

• SpectrAlert
• SpectrAlert Advance
• Earlier L-Series devices

This compatibility can make L-Series LED appliances useful in system upgrades or expansions, subject to fire alarm control panel, power supply, synchronization, and listing requirements.

Testing & Maintenance

Testing should confirm:

• Proper horn activation
• Proper LED strobe activation
• Correct selected candela
• Correct horn tone
• Correct high or low volume setting
• Proper Temporal 3 operation where selected
• Proper System Sensor synchronization
• Correct NAC voltage
• Correct circuit polarity
• Secure field wiring
• Secure mounting
• Proper DVM test-point operation
• Correct restoration after testing

System Sensor specifies that notification appliances must be tested and maintained according to NFPA 72 for UL applications or CAN/ULC S536 for applicable ULC installations.

Product Identification

Manufacturer: System Sensor / Honeywell
Model: P2RLED-P
Series: L-Series with LED
Product Type: LED Horn Strobe
Primary Function: Audible / Visual Life-Safety Notification
Housing Color: Red
Housing Marking: Plain / No FIRE Lettering
Mounting: Wall
Wiring: Two-Wire
Nominal Voltage: 24 VDC
Operating Voltage: 16–33 VDC
Candela Settings: 15 / 30 / 75 / 95 / 110 / 135 / 185 cd
Horn Settings: 8 Tone / Volume Combinations
Sound Patterns: Temporal 3 / Non-Temporal / 3.1 kHz Options
Sound Output: Up to approximately 87 dBA under specified conditions
Strobe Flash Rate: 1 flash per second
Wire Gauge: 12–18 AWG
Operating Temperature: 32°F to 120°F / 0°C to 49°C
Humidity: 10%–93%, non-condensing
Dimensions: 5.67 × 4.70 × 2.07 in
Synchronization: System Sensor Sync Protocol
Diagnostic Feature: DVM Voltage Test Points
Environment: Indoor

Protection & Applications

Suitable applications include:

• Commercial Fire Alarm Systems
• Audible and Visual Notification
• LED Fire Alarm Notification
• Emergency Evacuation Signaling
• Two-Wire Notification Appliance Circuits
• Synchronized Horn Strobe Systems
• Plain-Cover Notification Applications
• Office Buildings
• Hospitals and Healthcare Facilities
• Schools and Universities
• Hotels
• Government Buildings
• High-Rise Buildings
• Apartment Buildings
• Retail Facilities
• Industrial Facilities
• Warehouses
• Institutional Buildings
• Commercial Life Safety Systems