System Sensor apa451 Duct Smoke Detector Remote Annunciator

Product Description

The SYSTEM SENSOR apa451 is a remote annunciator designed for use with duct smoke detectors in commercial HVAC systems. It provides a local audible and visual alarm indication at a convenient mounting location away from the duct detector itself, allowing building personnel and HVAC technicians to quickly identify alarm conditions without accessing the duct housing directly. The unit operates on 16 to 33 volts DC and is equipped with a piezo alarm for audible notification. Wire connections accept 12 to 18 AWG wire gauge. Licensed HVAC and fire alarm contractors typically handle installation and commissioning of this device.

The apa451 is suited for commercial and industrial HVAC installations where duct smoke detection is required by fire codes or building specifications. It mounts remotely from the duct detector, making it useful in mechanical rooms, corridors, or air handling unit enclosures where direct detector access is limited. The annunciator gives on-site personnel a clear alarm signal without requiring them to locate the duct-mounted sensor head.

Key Features

• Piezo alarm provides audible alert at the remote annunciator location
• Operating voltage range of 16 to 33 volts DC accommodates standard fire alarm panel power supplies
• Accepts 12 to 18 AWG field wiring for installation flexibility
• UL S4011 listed for use in duct smoke detection applications
• Compact form factor at 2.9 inches wide, 45 inches deep, and 4.6 inches tall

Compatibility

Designed as an OEM-style remote annunciator for use with compatible duct smoke detector units in commercial HVAC fire detection systems. Verify compatibility with the specific duct detector model before installation.

Installation Notes

Installation should be performed by a licensed fire alarm or HVAC technician in accordance with NFPA 72 and local authority having jurisdiction requirements. Disconnect and lock out all power to the fire alarm circuit before wiring the annunciator. Confirm wire gauge and polarity requirements match the connected duct detector and panel specifications before energizing the system. Do not install in environments outside the rated voltage range of 16 to 33 volts DC.

Technical Specifications

• Voltage Rating: 16 to 33 volts DC
• Maximum DC Voltage Rating: 24 volts
• Alarm Current: 30 mA
• Wire Gauge: 12 to 18 AWG
• Width: 2.9 inches
• Depth: 45 inches
• Height: 4.6 inches
• Approval: UL S4011

Standard Information

• Brand: SYSTEM SENSOR
• Manufacturer Part Number: apa451