System Sensor APA151 Annunciator

The System Sensor APA151 is a critical remote annunciator with piezo alert designed for HVAC duct smoke detection systems. Engineered to meet NFPA 90A requirements, this accessory provides both audible and visual notification for 4-wire conventional duct smoke detectors when a system control panel is not present. Operating at 24 VDC (nominal range 16 to 33 VDC), the APA151 features a high-visibility red alarm LED and a green power LED to ensure continuous monitoring of system status. The integrated piezoelectric horn delivers a minimum output of 85 dBA at 10 feet, facilitating rapid identification of smoke conditions within air handling units. Designed for durability and ease of installation, this fire alarm annunciator mounts securely to a standard single-gang electrical box. When integrating this duct smoke detector accessory into your fire safety layout, ensure all wiring connections maintain a resistance of 25 ohms or less to ensure optimal performance and code compliance for localized HVAC fire safety applications.

Key Benefits

• Ensures NFPA 90A compliance for 4-wire duct smoke detection systems operating without a central fire alarm control panel.
• Features a high-decibel piezoelectric alarm rated for 85 dBA, providing clear audible alerts in noisy mechanical environments.
• Includes dual LED indicators for instantaneous visual status monitoring of system power and alarm conditions.
• Offers wide electrical compatibility with an operating voltage range of 16 to 33 VDC, optimized for standard 24Vdc systems.
• Simplifies field installation with standard single-gang mounting and support for 12 to 18 AWG field wiring.

Common Questions

Is the System Sensor APA151 compatible with 2-wire duct detectors?
No, the APA151 is specifically engineered for use with 4-wire conventional duct smoke detectors, such as the D4120 series, and requires a dedicated power source to drive the piezo sounder and LEDs.

Does the APA151 require a separate fire alarm control panel to function?
The APA151 is designed primarily for standalone applications where a fire alarm control panel is not used, allowing the duct detector to trigger the annunciator directly.

What is the maximum wire run distance for this annunciator?
For reliable signal transmission, total wire loop resistance should not exceed 25 ohms between the smoke detector and the APA151 annunciator. Always use 12 to 18 AWG copper wire based on the distance of the run.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.