System Sensor APA151 Annunciator and seat washers for a

and seat washers for a complete valve overhaul

187 inches (approx

Versatile Media Handling: Suitable for natural gas

Its compact frame allows for efficient mounting within crowded control panels

it prevents burner operation under unsafe venting conditions

System Sensor APA151 Annunciator and seat washers for aThe 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