What Are the Specifications of the USI/SM/HWREP Smoke Alarm?
The USI/SM/HWREP and USI/SM/HWREP/3 are hardwired photoelectric smoke alarms designed to deliver fast, accurate detection of smoke while reducing the risk of false alarms. They’re built for reliability, equipped with a 9v battery backup, and feature interconnect capabilities for added protection throughout your home. Whether you’re upgrading or installing new alarms, this model is built for dependable everyday safety.
Key Areas Covered:
Model Number: USI/SM/HWREP & USI/SM/HWREP/3
Product Overview
Specifications
Features & Benefits
Installation Requirements
FAQs
Usage & Tips
Specifications:
Power Source: 120VAC/60Hz, 9V Battery Backup
Operating Temperature: 40°F to 100°F (4.4°C to 37.8°C)
Humidity Range: 10% – 95% RH (non-condensing)
Dimensions: 5.66 x 1.49 in (144 x 38 mm)
Weight: Approx. 240g (with battery)
Voltage: 120V AC
Audible Alarm: ≥ 85dB at 10 feet
Alarm Indicators: Red and Green LEDs
Alarm Mode: Sound and Light
Mount Type: Ceiling or wall
Rated Life: 10 years
Safety Rating: UL STD 217 Compliant
Warranty: 10 years (from date of purchase)
Features & Benefits:
Photoelectric sensor for fast smoke detection and fewer false alarms
Hardwired with 9v battery backup to ensure protection even during power outages
Interconnects with up to 12 compatible alarms for whole-home coverage
Silence button for nuisance alarms
Visual alerts via red and green LEDs
Dust cover for installation during construction
Flame-retardant housing
Installation Requirements:
Mount on the ceiling or wall with UL Listed junction box
Powered by a 120VAC circuit (non-switchable)
Suitable wiring setup including black (live), white (neutral), and red (interconnect)
Not for recessed mounting
Avoid areas with extreme humidity, temperature, dust, or airflow obstructions
FAQs:
Q: Does it work during power outages?
A: Yes, it uses a 9v battery backup to ensure continuous operation.Q: Can I use lithium batteries?
A: No, only use recommended carbon zinc batteries like GP1604S or EVEREADY 1222.Q: How often should I test the alarm?
A: Weekly testing is recommended using the test/silence button.
Usage & Tips:
Always test weekly by pressing and holding the test button
Replace the backup battery annually
Keep the dust cover until after construction is complete
Use a vacuum or soft brush to clean the outer vents monthly
Never paint over the alarm