1. Product Overview
The Kidde KN-COPE-IC is a hardwired combination smoke and carbon monoxide (CO) alarm designed to provide protection against two hazards: fire and carbon monoxide. This unit features a photoelectric smoke sensor for detecting visible particles associated with smoldering fires and a fuel cell CO sensor for accurate carbon monoxide detection. It includes a 9V battery backup for continued operation during power outages and voice warnings to clearly announce the type of danger.

Figure 1: Kidde KN-COPE-IC Combination Smoke and Carbon Monoxide Alarm with front-loading battery compartment visible.
2. Installation and Setup
2.1 Placement Guidelines
Install the alarm on the surface of any wall or ceiling, following UL/NFPA/Manufacturer’s recommended placement guidelines. It can be installed on any standard single gang electrical box, up to a 4-inch octagon junction box. For optimal protection, install smoke alarms on every floor, in hallways, inside bedrooms, and outside of sleeping areas.
2.2 Wiring and Power
This unit is powered by a 120VAC, 60Hz source with a 9V battery backup. The electrical connection to the alarm is made with a plug-in connector. An included 9V battery protects the unit during short-term power outages. Ensure the main power supply is off before installation.
2.3 Battery Installation
The uniquely designed front-loading battery compartment makes battery replacement quick and easy, ensuring proper installation. To install or replace the 9V battery:
- Open the front-loading battery door.
- Connect the 9V battery to the battery clips.
- Insert the battery into the compartment.
- Close the battery door securely.
2.4 Interconnection
A maximum of 24 Kidde devices can be interconnected in a multiple station arrangement. The interconnect system must not exceed the NFPA (National Fire Protection Association) limit of 18 initiating devices, of which 12 can be smoke alarms. With 18 initiating devices (smoke, heat, CO, etc.) interconnected, it is still possible to interconnect 6 strobe lights and/or relay modules.
3. Operating Instructions
3.1 Normal Operation
During normal operation, the green LED will be steadily on when AC power is present. If operating on battery only, the green LED will flash every 30 seconds.
3.2 Alarm Indications
- Fire Warning: The red LED will flash and be accompanied by three long alarm beeps followed by a verbal warning message “Fire! Fire!” The alarm will repeat this pattern until the unit is reset or smoke is eliminated.
- Carbon Monoxide Warning: Four short alarm beeps followed by a verbal warning “Warning, Carbon Monoxide.” This continues until the unit is reset or the CO is eliminated.
- Low Battery Warning: One chirp followed by the warning “Low Battery.” The red LED light will flash. This pattern will continue every minute for the first hour. After the first hour, the red LED light will flash once every minute accompanied by the chirp sound. The “Low Battery” warning will only sound once every fifteen minutes.
- Alarm Memory: The green LED will blink once every 16 seconds to alert a user when the unit has alarmed for smoke or has detected a concentration of CO. If the alarm has detected a CO level of 100ppm or greater, when the test/reset button is pressed, the unit will announce “CO previously detected.” If the alarm has detected abnormal levels of smoke since its last test, it will produce three rapid beeps.
3.3 Smart Hush™ Feature
The Smart Hush™ feature silences the unit for approximately 8 minutes if a nuisance alarm condition occurs. The green LED on the alarm will flash every 2 seconds while in Smart Hush™ mode and will automatically reset itself. It also provides voice annunciation of “Hush Activated” when Smart Hush™ is activated and “Hush Cancelled” when the Hush cycle ends.
4. Maintenance
4.1 Testing the Alarm
The alarm includes a test button that will electronically simulate the presence of smoke and CO and cause the unit to go into both modes of alarm. This sequence tests the unit’s electronics to ensure proper operation. Press and hold the test button weekly to ensure the alarm is functioning correctly.
4.2 Battery Replacement
Replace the 9V battery annually or when the low battery warning sounds. Use only recommended replacement batteries. The front-loading battery compartment simplifies this process.
4.3 Cleaning
Regularly clean the alarm to prevent dust and debris from interfering with its sensors. Use a soft brush attachment on your vacuum cleaner to gently clean around the alarm’s vents. Do not paint the alarm.
5. Troubleshooting
If the alarm sounds or indicates a fault, take the following actions:
- Smoke Alarm: If the “Fire! Fire!” voice warning sounds, evacuate the premises immediately and call emergency services.
- Carbon Monoxide Alarm: If the “Warning, Carbon Monoxide” voice warning sounds, move to fresh air immediately and call emergency services.
- Low Battery Chirp: Replace the 9V battery.
- Nuisance Alarms: If the alarm sounds due to cooking smoke or steam, activate the Smart Hush™ feature by pressing the test/reset button.
- Persistent Chirping/Fault: If chirping continues after battery replacement or if the unit indicates a fault, consult the full user manual or contact Kidde customer support.
6. Specifications
| Feature | Detail |
|---|---|
| Brand | Kidde |
| Model Number | 21007624 (KN-COPE-IC) |
| Power Source | 120 Volts (AC) with 9V Battery Backup |
| Sensor Type | Photoelectric (Smoke), Electrochemical (CO) |
| Alarm Type | Voice and Visual (85 decibels at 10 feet) |
| Color | White |
| Product Dimensions | 1.85"D x 5.79"W x 5.79"H |
| Item Weight | 0.92 Pounds (14.7 ounces) |
| Operating Temperature | 40°F to 100°F (4°C to 38°C) |
| Operating Humidity | 5% - 95% relative humidity |
| Compatible Devices | Up to 24 Kidde devices (max 18 initiating) |
| CO Alarm Response Times | 70 ppm: 60-240 min; 150 ppm: 10-50 min; 400 ppm: 4-15 min |
| Certifications | UL 2034, UL217, NFPA72, NFPA101, California State Fire Marshall, FHA, HUD |

Figure 2: Dimensions of the Kidde KN-COPE-IC Combination Smoke and Carbon Monoxide Alarm.
7. Warranty and Support
This Kidde alarm includes a 7-year limited manufacturer’s warranty. For technical support or warranty claims, please refer to the contact information provided in the packaging or visit the official Kidde website.
8. Additional Safety Information
For comprehensive fire preparedness information and additional safety tips, you may find the following video helpful. This video provides general guidance on home fire safety and preparedness.
Video 1: Fire Preparedness Tips. This video offers general advice on preparing for fire emergencies in your home.





