System Sensor HCWL-LF L-Series Low-Frequency Ceiling Sounder, White

System Sensor HCWL-LF Low-Frequency Ceiling Sounder

The System Sensor HCWL-LF Low-Frequency Ceiling Sounder is a white indoor fire notification appliance that produces a 520 Hz ± 10% square-wave tone. Designed for ceiling installation and sleeping-space notification, it operates from a nominal 24 V power source across a specified 16 to 33 V operating range.

This L-Series audible appliance supports Temporal 3, Temporal 4, continuous, and coded signaling, giving installers multiple operating choices for fire and emergency notification systems. High and low volume selections help balance audible output with notification appliance circuit current requirements. Its round ceiling format fits applications such as hotels, apartments, dormitories, healthcare facilities, and other occupancies requiring low-frequency notification.

The HCWL-LF uses plug-in construction and a mounting plate with an onboard shorting spring, allowing technicians to verify wiring continuity before installing the sounder. It accepts 12 to 18 AWG field wiring and is electrically compatible with legacy SpectrAlert and SpectrAlert Advance appliances. Agency approvals include UL, FM, and CSFM listings for professional fire-protective installations.

Key Features

• 520 Hz Low-Frequency Tone: Generates a 520 Hz ± 10% square-wave signal for low-frequency notification applications.
• Ceiling-Mount Configuration: Uses a round housing designed specifically for indoor ceiling installations.
• Selectable Tone Patterns: Supports Temporal 3, Temporal 4, continuous, and coded signaling modes.
• High and Low Volume: Lets installers select the appropriate audible level while managing circuit current.
• Plug-In Construction: Reduces intrusion into the electrical back box for easier installation and servicing.
• Wiring Continuity Check: The mounting plate incorporates a shorting spring for testing field wiring before device installation.
• Legacy Compatibility: Electrically compatible with SpectrAlert and SpectrAlert Advance notification appliances.

Technical Specifications

• Brand: System Sensor
• Model: HCWL-LF
• Series: L-Series
• Product Type: Low-Frequency Sounder
• Alarm Type: Audible
• Color: White
• Face Marking: None
• Application: Indoor
• Mounting: Ceiling
• Connectivity: Wired, 2-wire
• Frequency Range: 520 Hz ± 10%
• Waveform: Square wave
• Tone Settings: Temporal 3, Temporal 4, continuous, coded
• Volume Settings: High and low
• UL Reverberant Sound Output, High: 80 dBA
• UL Reverberant Sound Output, Low: 76 dBA
• ULC Anechoic Sound Output, High: 82 dBA
• ULC Anechoic Sound Output, Low: 78 dBA
• Temporal 3 High Current Draw: 108 mA DC, 150 mA FWR
• Temporal 3 Low Current Draw: 78 mA DC, 76 mA FWR
• Temporal 4 High Current Draw: 111 mA DC, 151 mA FWR
• Temporal 4 Low Current Draw: 80 mA DC, 76 mA FWR
• Continuous High Current Draw: 111 mA DC, 151 mA FWR
• Continuous Low Current Draw: 80 mA DC, 76 mA FWR
• Coded High Current Draw: 111 mA DC, 151 mA FWR
• Coded Low Current Draw: 80 mA DC, 76 mA FWR
• Nominal Voltage: Regulated 24 V DC or full-wave rectified (FWR)
• Operating Voltage Range: 16 to 33 V
• MDL3 Sync Module Operating Range: 16.5 to 33 V
• Input Terminal Wire Gauge: 12 to 18 AWG
• Operating Temperature: 32°F to 120°F
• Humidity Range: 10% to 93% non-condensing
• Dimensions: 6.8" diameter x 1.4" high
• Compatible Surface-Mount Back Box: SBBCWL
• Dimensions with SBBCWL: 6.9" diameter x 3.9" high
• Electrical Compatibility: Legacy SpectrAlert and SpectrAlert Advance devices
• Synchronization Compatibility: System Sensor MDL3 SyncCircuit module
• UL Listing: UL 464, S4011
• FM Approval: PR452768
• CSFM: 7135-1653:0516
• Country of Origin: Mexico