This manual provides information on the installation and operation of the SF450 Carbon Monoxide alarm.
The SF450EN carbon monoxide alarm detects CO using an electro‑chemical cell and alerts users with a flashing red light and audible alarm. It is intended for indoor use in areas with fuel‑burning appliances such as wood, gas, or oil heaters.
The manual covers proper positioning, wall‑mounting installation, activation, monthly testing, hush feature, maintenance, battery life, and troubleshooting. Safety warnings, disposal instructions, and contact information for Honeywell Analytics are also included.
| Model | SF450EN |
|---|---|
| Gas Detected | Carbon Monoxide |
| Detection Principle | Electro‑chemical cell |
| Alarm Indication | Flashing red light and audible alarm |
| Alarm Level (50 ppm) | 60‑90 min |
| Operating Temperature | -10 °C to 40 °C |
| Humidity Range | 30 %‑90 % RH |
| Warm‑up Time | Instantaneous |
| Normal Operating Life | Up to 6.5 years |
| Battery Life (alarm condition) | At least 5 days |
| Dimensions | 110 mm × 76 mm × 34 mm |
| Weight | ≈ 180 g |
The unit should be tested monthly by pressing and holding the test button for 5 seconds.
It silences the audible alarm for 5 minutes while the red light continues to flash.
The alarm signals at 50 ppm after 60‑90 min, at 100 ppm after 10‑40 min, and at 300 ppm in less than 3 min.
With normal use the batteries can last up to 7 years, but they provide at least 5 days of operation when the alarm is active.