System Sensor HRL2-LF-BP10 Low Frequency Horn Pack of 10

The System Sensor HRL2-LF-BP10 Low Frequency Horn Pack of 10 is a bulk package containing 10 red HRL2-LF L-Series second-generation low-frequency wall sounders. Each appliance produces a 520 Hz ±10% square-wave audible signal and is designed for life-safety applications requiring low-frequency notification, particularly sleeping spaces addressed by NFPA 72 requirements.

The HRL2-LF is a sounder-only notification appliance with no visual strobe. It operates from a regulated 24 VDC notification circuit and provides selectable audible patterns and output levels, System Sensor synchronization compatibility, plug-in mounting, onboard wiring-continuity testing, and DVM diagnostic voltage test points. The HRL2-LF-BP10 packages these devices in bulk for projects requiring multiple identical red low-frequency sounders.

Product Functions

• Bulk package containing 10 low-frequency sounders
• Provides 520 Hz ±10% low-frequency audible notification
• Produces a square-wave tone
• Designed for sleeping-space notification applications
• Red wall-mount configuration
• Plain housing with no FIRE marking
• Sounder-only design with no strobe
• Operates from regulated 24 VDC
• Provides high and low output selections
• Supports Temporal 3 signaling
• Supports Temporal 4 signaling
• Provides coded operation on sounder-only models
• Uses a rotary switch for tone and volume selection
• Supports System Sensor synchronization
• Includes DVM diagnostic voltage test points
• Uses plug-in mounting plate design
• Includes shorting springs for wiring continuity testing
• Electrically compatible with supported legacy SpectrAlert, SpectrAlert Advance, and L-Series appliances
• Designed for indoor fire alarm notification applications

Pack of 10 Configuration

The “-BP10” suffix identifies the bulk-pack configuration of the HRL2-LF.

The HRL2-LF-BP10 is described in distribution listings as:

L-Series 2nd Generation LF Sounder; Wall; Red; Bulk Pack; Plain.

The package contains 10 HRL2-LF low-frequency sounders, making it convenient for larger installations such as hotels, apartments, dormitories, healthcare facilities, and other projects requiring multiple identical appliances.

The individual appliance specifications and operating characteristics are those of the HRL2-LF.

Low Frequency Sounder Operation

The primary function of each HRL2-LF is to generate a 520 Hz ±10% square-wave audible signal.

System Sensor designed the L-Series low-frequency sounder family specifically to address NFPA 72 sleeping-space requirements calling for low-frequency notification appliances operating around 520 Hz.

Low-frequency signaling is commonly specified in sleeping areas because it is intended to provide more effective awakening notification than conventional higher-frequency fire alarm horns for applicable occupants and installations.

Red Plain Housing

The HRL2-LF is the red, plain-marked wall sounder in the second-generation L-Series low-frequency family.

System Sensor’s current product matrix identifies:

HRL2-LF — Sounder, Red, Plain.

Because it is a sounder-only appliance, it does not use the prominent FIRE lettering commonly found on horn-strobes and other visual notification appliances.

Temporal 3 Signaling

The HRL2-LF supports Temporal 3 audible signaling.

Temporal 3 is the standardized three-pulse evacuation pattern commonly used for fire alarm notification. When configured for this mode, the appliance produces the Temporal 3 pattern using its distinctive 520 Hz low-frequency square-wave tone.

The exact signaling arrangement must correspond with the approved fire alarm system design and connected control equipment.

Temporal 4 Signaling

The HRL2-LF also supports Temporal 4 signaling.

Temporal 4 provides a distinguishable coded audible pattern for applications where the emergency signaling strategy requires it.

The use of Temporal 4 depends on the applicable codes, system programming, occupancy requirements, and approved sequence of operations.

Coded Operation

System Sensor specifically provides a coded setting on the sounder-only models, including the HRL2-LF.

This provides additional flexibility for fire alarm systems where the audible notification pattern is controlled according to the system’s required signaling strategy.

Tone and volume selection are made using the appliance’s rotary configuration switch.

High & Low Output Selection

The HRL2-LF provides high and low audible output options.

Selectable output allows installers to optimize the appliance according to:

• Required sound pressure level
• Ambient noise
• Room dimensions
• Sounder spacing
• Sleeping-space requirements
• NAC loading
• Voltage drop
• Approved fire alarm design

Lower-output settings can also help reduce notification circuit current where the higher setting is not required.

System Sensor Synchronization

The HRL2-LF supports the System Sensor synchronization protocol.

Synchronization can be provided through compatible UL-approved power supplies that support System Sensor Sync or compatible System Sensor synchronization equipment.

This allows multiple compatible low-frequency notification appliances to operate in a coordinated manner according to the system design.

DVM Diagnostic Test Points

Each HRL2-LF includes Digital Voltage Meter (DVM) diagnostic test points on the appliance.

These allow technicians to measure operating voltage without removing the complete sounder from the wall.

DVM test points can simplify:

• NAC voltage verification
• End-of-line voltage checks
• Voltage-drop measurements
• Commissioning
• Troubleshooting
• Inspection and maintenance

This feature reduces the need to remove appliances simply to obtain voltage measurements.

Plug-In Mounting System

The HRL2-LF uses the System Sensor L-Series plug-in mounting design.

The universal mounting plate can be installed and wired before the sounder is attached. An onboard shorting spring allows field wiring continuity to be checked before the appliance itself is installed.

This arrangement can help:

• Simplify rough-in wiring
• Protect sounders during construction
• Reduce installation time
• Minimize intrusion into the electrical backbox
• Reduce wiring-related installation problems
• Simplify final appliance installation

Legacy Compatibility

System Sensor identifies the second-generation low-frequency appliances as electrically compatible with supported legacy notification products operating within the documented 16–33 VDC range, including SpectrAlert, SpectrAlert Advance, and earlier L-Series devices.

The current HRL2-LF replaces the previous HRL-LF model.

Compatibility with the actual fire alarm control panel, power supply, synchronization method, and existing appliances should still be verified before retrofit installation.

Electrical Specifications

• Nominal Voltage: Regulated 24 VDC
• Operating Voltage Range: 16–33 V
• Fundamental Frequency: 520 Hz ±10%
• Waveform: Square wave
• Audible Patterns: Temporal 3 / Temporal 4 / Coded
• Output Selection: High / Low
• Input Wire Gauge: 12–18 AWG
• Synchronization: System Sensor Sync compatible
• Configuration: Sounder only / no strobe

Actual current draw depends on the selected operating configuration and should be calculated using System Sensor’s applicable current tables when determining NAC loading and voltage drop.

Physical Specifications

• Model: HRL2-LF-BP10
• Individual Appliance: HRL2-LF
• Package Quantity: 10
• Mounting: Wall
• Color: Red
• Marking: Plain
• Strobe: None
• Individual Sounder Height: 5.67 in / 144 mm
• Individual Sounder Width: 4.70 in / approximately 119 mm
• Individual Sounder Depth: 1.63 in / approximately 41 mm

The appliance uses the standard L-Series wall profile and shares common aesthetics with other current System Sensor notification products.

Environmental Specifications

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

Outdoor or weather-exposed installations require appropriately listed outdoor notification appliances.

Installation Information

Typical HRL2-LF installation includes:

• Installing the universal mounting plate
• Connecting the notification appliance circuit
• Maintaining correct circuit polarity
• Selecting the required audible pattern
• Selecting high or low output
• Testing wiring continuity through the mounting plate
• Installing the sounder onto the mounting plate
• Securing the appliance
• Measuring operating voltage through the DVM test points
• Verifying System Sensor synchronization where required
• Testing the 520 Hz low-frequency signal
• Confirming fire alarm control panel supervision

Each appliance accepts 12–18 AWG field wiring and is designed for a regulated 24 VDC notification circuit.

Testing & Maintenance

Testing should confirm:

• Proper low-frequency sounder activation
• Correct 520 Hz ±10% square-wave output
• Correct Temporal 3 operation where selected
• Correct Temporal 4 operation where selected
• Correct coded operation where configured
• Correct high or low output setting
• Proper System Sensor synchronization
• Correct NAC voltage
• Correct circuit polarity
• Proper DVM test-point operation
• Secure field wiring
• Secure wall mounting
• Correct fire alarm control panel supervision
• Proper restoration following testing

Each sounder should also be inspected for physical damage, paint, contamination, obstruction, or other conditions that could interfere with audible notification.

Product Identification

• Manufacturer: System Sensor / Honeywell
• Model: HRL2-LF-BP10
• Individual Model: HRL2-LF
• Series: L-Series Second Generation
• Product Type: Low Frequency Wall Sounder Bulk Pack
• Package Quantity: 10
• Primary Function: Audible Life-Safety Notification
• Mounting: Wall
• Color: Red
• Marking: Plain
• Strobe: No
• Fundamental Frequency: 520 Hz ±10%
• Waveform: Square Wave
• Audible Patterns: Temporal 3 / Temporal 4 / Coded
• Output Settings: High / Low
• Nominal Voltage: 24 VDC
• Operating Voltage: 16–33 V
• Wire Gauge: 12–18 AWG
• Operating Temperature: 32°F–120°F / 0°C–49°C
• Humidity: 10%–93%, non-condensing
• Individual Dimensions: 5.67 × 4.70 × 1.63 in
• Synchronization: System Sensor Sync
• Diagnostic Feature: DVM Voltage Test Points
• Previous Individual Model: HRL-LF
• Environment: Indoor

Applications

Suitable for:

• Commercial Fire Alarm Systems
• Low-Frequency Fire Alarm Notification
• 520 Hz Audible Notification
• Sleeping-Area Fire Alarm Systems
• Emergency Evacuation Signaling
• Wall-Mount Notification Applications
• System Sensor Synchronized Notification Systems
• Multi-Room Fire Alarm Projects
• Fire Alarm System Retrofits
• Hotels and Motels
• Apartment Buildings
• Residential Buildings
• College Dormitories
• Assisted-Living Facilities
• Healthcare Facilities
• Hospitals
• Institutional Facilities
• Schools and Universities
• High-Rise Residential Buildings
• Mixed-Use Buildings
• Commercial Life-Safety Systems

The System Sensor HRL2-LF-BP10 Low Frequency Horn Pack of 10 is particularly useful for larger projects requiring multiple matching red wall-mounted 520 Hz low-frequency sounders. The 10-pack combines the HRL2-LF’s selectable signaling, System Sensor synchronization, plug-in installation, and DVM diagnostic features with bulk packaging for multi-device installations.