System Sensor HWL2-LF-BP10 Low Frequency Horn Pack of 10

The System Sensor HWL2-LF-BP10 Low Frequency Horn Pack of 10 is a bulk package containing 10 white HWL2-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. Honeywell’s current L-Series documentation identifies HWL2-LF as the white wall-mounted low-frequency sounder.

The HWL2-LF is a sounder-only notification appliance with no strobe. It operates from a regulated 24 VDC notification circuit and provides selectable audible patterns and output levels, System Sensor synchronization, plug-in mounting, onboard continuity testing, and DVM diagnostic voltage test points. The BP10 configuration packages ten matching white units for larger projects requiring multiple low-frequency sounders.

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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
• White wall-mount configuration
• Sounder-only design with no strobe
• Operates from regulated 24 VDC
• Supports high and low output selections
• Supports Temporal 3 signaling
• Supports Temporal 4 signaling
• Supports coded operation
• Uses a rotary switch for tone and volume selection
• Supports System Sensor synchronization
• Includes DVM diagnostic voltage test points
• Uses a plug-in mounting plate
• Includes shorting springs for circuit continuity testing
• Accepts 12–18 AWG field wiring
• Designed for indoor fire alarm notification applications

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Pack of 10 Configuration

The “-BP10” suffix identifies a bulk package containing 10 appliances.

Honeywell/System Sensor documentation has used the BP10 designation for ten-unit bulk packs of low-frequency sounders. Earlier product documentation specifically lists HWL-LF-BP10 as a white low-frequency wall sounder bulk pack of 10, establishing the manufacturer’s BP10 packaging convention.

The current HWL2-LF-BP10 therefore provides ten second-generation HWL2-LF sounders for multi-room and multi-device installations.

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Low Frequency Sounder Operation

Each HWL2-LF generates a 520 Hz ±10% square-wave audible signal.

System Sensor’s current installation documentation identifies the second-generation HWL2-LF as part of its L-Series low-frequency sounder family and specifies regulated 24 VDC operation with a 16–33 V operating range.

Low-frequency signaling is commonly used in sleeping spaces because applicable fire alarm codes may require a lower-frequency audible signal intended to improve occupant awakening.

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White Wall-Mount Design

The HWL2-LF is the white wall-mounted version of System Sensor’s second-generation low-frequency sounder.

System Sensor’s current product table distinguishes:

• HRL2-LF — Red wall low-frequency sounder
• HWL2-LF — White wall low-frequency sounder
• HCRL2-LF — Red ceiling low-frequency sounder
• HCWL2-LF — White ceiling low-frequency sounder

This makes the HWL2-LF-BP10 suitable where a white finish is preferred for finished architectural interiors.

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Temporal 3 Signaling

The HWL2-LF supports Temporal 3 fire alarm signaling.

Temporal 3 provides the standardized three-pulse audible evacuation pattern commonly associated with fire alarm systems.

When configured in this mode, the appliance produces the Temporal 3 pattern using its 520 Hz low-frequency waveform.

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Temporal 4 Signaling

The HWL2-LF also supports Temporal 4 operation.

Temporal 4 provides a distinguishable audible pattern that may be used where the approved emergency signaling strategy requires a different notification sequence from standard Temporal 3.

The exact use of Temporal 4 depends on system design, applicable codes, and control-panel programming.

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Coded Operation

Sounder-only models in the L-Series low-frequency family support coded operation in addition to temporal patterns.

This gives the system designer additional flexibility when the fire alarm control equipment provides or requires coded audible signaling.

Tone and output settings are configured at the appliance according to System Sensor installation instructions.

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High & Low Output Selection

The HWL2-LF provides high and low audible output settings.

Selectable output allows the installer to optimize the appliance for:

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

The selected setting should be verified during system testing to ensure the required audibility is achieved.

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System Sensor Synchronization

The HWL2-LF supports the System Sensor synchronization protocol.

Compatible fire alarm control panels, power supplies, or synchronization modules can coordinate supported notification appliances so they operate according to the system’s intended signaling pattern.

This is particularly useful in installations with multiple low-frequency sounders operating in the same area.

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DVM Diagnostic Test Points

Each HWL2-LF includes Digital Voltage Meter (DVM) diagnostic test points.

These allow technicians to check notification appliance circuit voltage without removing the sounder from its mounting position.

This can simplify:

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

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Plug-In Mounting System

The HWL2-LF uses the System Sensor plug-in mounting plate design.

The mounting plate can be installed and wired before the sounder itself is attached. Integrated shorting springs allow technicians to verify field-wiring continuity during rough-in.

This can help:

• Protect appliances during construction
• Simplify circuit testing
• Reduce installation time
• Make final appliance installation easier
• Reduce unnecessary handling of finished devices

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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
• Configuration: Sounder only
• Strobe: None

Actual current draw depends on the selected operating mode and should be calculated from the manufacturer’s applicable current tables when determining NAC capacity and voltage drop.

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Physical Specifications

• Model: HWL2-LF-BP10
• Individual Appliance: HWL2-LF
• Package Quantity: 10
• Mounting: Wall
• Color: White
• Strobe: None
• Individual Height: 5.67 in / 144 mm
• Individual Width: 4.70 in / approximately 119 mm
• Individual Depth: 1.63 in / approximately 41 mm

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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 applications require an appropriately listed outdoor notification appliance.

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Installation Information

Typical HWL2-LF installation includes:

• Installing the universal mounting plate
• Connecting the notification appliance circuit
• Maintaining correct circuit polarity
• Selecting the required signaling 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 output
• Confirming fire alarm control panel supervision

Each sounder accepts 12–18 AWG field wiring.

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Testing & Maintenance

Testing should confirm:

• Proper low-frequency sounder activation
• Correct 520 Hz ±10% output
• Correct Temporal 3 operation where selected
• Correct Temporal 4 operation where selected
• Correct coded operation where configured
• Correct high or low output
• 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

The sounders should also be inspected for physical damage, paint, contamination, obstruction, or other conditions that could reduce audible output.

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Product Identification

• Manufacturer: System Sensor / Honeywell
• Model: HWL2-LF-BP10
• Individual Model: HWL2-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: White
• 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
• Environment: Indoor

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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
• 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 HWL2-LF-BP10 Low Frequency Horn Pack of 10 is particularly useful for projects requiring multiple matching white wall-mounted 520 Hz low-frequency sounders. Its bulk packaging, selectable signaling, synchronization capability, plug-in mounting design, and diagnostic test points make it well suited to larger sleeping-area and life-safety installations.