Kidde KN-COSM-IB User Manual: Comprehensive Guide
This comprehensive guide details the Kidde KN-COSM-IB combination smoke and carbon monoxide alarm, covering installation, operation, maintenance, and troubleshooting procedures.
The Kidde KN-COSM-IB is a versatile combination alarm designed to detect both smoke and carbon monoxide, offering crucial protection in a single unit. This alarm functions effectively as a single station device or integrates seamlessly into a multi-station interconnected system, enhancing safety throughout your home. It’s suitable for various applications, providing early warning signals for both fire hazards and the presence of the odorless, colorless, and deadly carbon monoxide gas.
This user manual provides detailed instructions for proper installation, testing, and maintenance, ensuring optimal performance and reliability. Understanding these guidelines is essential for maximizing the alarm’s protective capabilities and safeguarding your family’s well-being. Refer to this guide for model-specific information regarding the KN-COSM-IB and KN-COSM-IBCA.
Key Features and Benefits
The Kidde KN-COSM-IB offers dual-sensor technology, providing comprehensive protection against both smoke and carbon monoxide. Key benefits include a single-button test function for easy verification of alarm operation and a silence/hush mode to temporarily reduce nuisance alarms. Interconnectivity allows multiple Kidde alarms (up to 24 devices) to activate simultaneously, alerting occupants throughout the entire home.
This model features distinct alarm sound patterns for smoke and CO, enabling quick identification of the hazard. The alarm also incorporates a memory feature, indicating when an alarm occurred in your absence. Its suitability for single or multiple station installations offers flexible protection options, ensuring peace of mind for you and your family.
Package Contents
Upon opening the Kidde KN-COSM-IB package, you should find the following items carefully included. The primary component is, of course, one Kidde Combination Smoke and Carbon Monoxide Alarm, model KN-COSM-IB (or KN-COSM-IBA, depending on the specific variant). A mounting bracket is provided, essential for secure installation on either a wall or ceiling surface.
Included are screws and anchors, designed to facilitate a robust and lasting attachment. A user manual, detailing all aspects of operation, installation, and maintenance, is also present. Please verify that all listed components are present before proceeding with installation. If any items are missing, contact Kidde customer support immediately for assistance.

Installation Guide
Proper installation is crucial for optimal performance. This section provides detailed instructions for mounting, wiring (for interconnected models), and overall setup.
Choosing the Correct Location
Selecting the right location is paramount for effective smoke and carbon monoxide detection. Install alarms on every level of your home, inside each bedroom, and outside sleeping areas. Avoid installing in kitchens, bathrooms, or near fuel-burning appliances where nuisance alarms are common.
Mount the alarm on a wall or ceiling, at least 4 inches from walls and corners, to ensure proper airflow. Do not obstruct the alarm with furniture or curtains. For sloped ceilings, position the alarm within 3 feet of the peak. Consider local regulations and building codes regarding alarm placement for optimal safety and compliance.
Mounting the Alarm
Before mounting, ensure the chosen location meets the guidelines in the ‘Choosing the Correct Location’ section. Use the provided mounting bracket as a template to mark screw holes on the wall or ceiling. Drill pilot holes and insert the provided screws, leaving approximately ¼ inch exposed.
Carefully align the alarm with the mounting bracket and gently twist it clockwise until it locks securely into place. Verify the alarm is firmly attached and does not wobble. Improper mounting can affect performance. Regularly inspect the mounting to ensure it remains secure over time, preventing accidental dislodgement.
Wiring Instructions (for Interconnect Models)
For interconnected models, turn OFF power to the circuit at the breaker. Identify the interconnect wiring terminals on the alarm – typically labeled ‘I’ or ‘INT’. Connect a 18-gauge wire (maximum 500 feet total length) between the interconnect terminals of all alarms in the system.
Ensure all connections are secure and follow local electrical codes. Incorrect wiring can compromise the entire system. After wiring, restore power at the breaker. Test the interconnection by activating one alarm; all interconnected alarms should sound simultaneously. A maximum of 24 Kidde devices can be interconnected.
Interconnecting Multiple Alarms
Interconnecting allows all Kidde KN-COSM-IB alarms to activate simultaneously upon detecting smoke or carbon monoxide, enhancing safety. A maximum of 24 compatible Kidde devices can be interconnected using a single 18-gauge wire. Ensure the circuit breaker is OFF before commencing any wiring.
Connect the interconnect wires to the designated terminals on each alarm. Proper wiring is crucial for reliable operation. After wiring, restore power and test the system by manually activating one alarm; all interconnected units should sound. This confirms successful interconnection and provides comprehensive protection throughout your home.

Understanding Alarm Functions
This section explains the core functionalities of the Kidde KN-COSM-IB, including smoke and carbon monoxide detection technologies, test button usage, and silence mode.
Smoke Detection Technology
The Kidde KN-COSM-IB utilizes photoelectric technology for smoke detection, generally more effective at detecting smoldering fires. This type of sensor alerts you to visible particles of combustion, rather than rapid flame growth. Photoelectric sensors are less prone to false alarms from cooking or steam compared to ionization sensors. However, they may react slower to fast-flaming fires.
Regular testing is crucial to ensure the smoke detection component functions correctly. The alarm continuously monitors the air for smoke particles, triggering an alarm when levels exceed pre-defined thresholds. Proper placement, away from obstructions, is vital for optimal performance. Maintaining a clean sensor chamber, free from dust and debris, also contributes to reliable smoke detection.
Carbon Monoxide Detection Technology
The Kidde KN-COSM-IB employs an electrochemical sensor to detect carbon monoxide (CO), an odorless, colorless, and deadly gas. This technology accurately measures CO levels in the surrounding air, providing early warning of potential hazards. Unlike older sensor types, electrochemical sensors offer increased accuracy and a longer lifespan.
The alarm continuously monitors CO concentrations, sounding a distinct alarm pattern when dangerous levels are detected. It’s crucial to understand that CO can be produced by malfunctioning fuel-burning appliances. Regular maintenance of these appliances is essential. The sensor’s sensitivity is calibrated to meet safety standards, ensuring reliable CO detection and protecting your family.
Test Button Functionality
The Test Button on the Kidde KN-COSM-IB simulates both smoke and carbon monoxide conditions, allowing for regular alarm functionality checks. Pressing and holding the button initiates a loud, electronic chirp, verifying the electronic circuitry, horn, and battery power are working correctly. It’s vital to test the alarm at least monthly to ensure continued reliability.
However, the Test Button does not verify the sensor’s ability to detect actual smoke or CO. It only confirms the alarm’s core components are operational. Always remember that testing doesn’t replace the need for regular maintenance and awareness of potential hazards. Consistent testing provides peace of mind, but doesn’t guarantee detection of every event.
Silence/Hush Mode Operation
The Silence/Hush mode on the Kidde KN-COSM-IB temporarily silences nuisance alarms caused by cooking or steam, but not carbon monoxide detection. Pressing the Hush button will quiet the alarm for approximately 8-10 minutes. The alarm will automatically reset and restore full sensitivity after this period.
It’s crucial to understand that the Hush mode is only effective for smoke alarms triggered by non-threatening events. If the alarm detects carbon monoxide, the Hush button will not silence it. The alarm will continue to sound until the CO levels subside. Never ignore a CO alarm, even if you’ve recently used the Hush function.

Alarm Signals and Indicators
This section explains the distinct sound patterns for smoke and carbon monoxide alarms, low battery warnings, and the alarm’s memory feature functionality.
Smoke Alarm Sound Pattern
The Kidde KN-COSM-IB emits a loud, distinct temporal pattern when smoke is detected. This pattern consists of four loud beeps, followed by a period of silence, repeating continuously. This specific sequence is designed to clearly differentiate a smoke alarm from other warning sounds, ensuring immediate attention.
The alarm will continue this pattern as long as smoke is present. If the smoke dissipates, the alarm will cease the beeping. It’s crucial to understand this sound signifies a potential fire hazard and requires immediate investigation and appropriate action, such as evacuating the premises and contacting emergency services.
Carbon Monoxide Alarm Sound Pattern
When the Kidde KN-COSM-IB detects carbon monoxide (CO), it emits a different alarm pattern than for smoke. This pattern consists of four loud beeps, followed by a pause, repeated continuously. However, the timing and tone are distinct from the smoke alarm signal, allowing for clear differentiation.
This CO alarm pattern is designed to alert occupants to the presence of this odorless, colorless, and potentially deadly gas. Immediate action is critical – evacuate the premises and call emergency services or the fire department. Do not ignore this alarm; CO poisoning can be life-threatening.
Low Battery Warning
The Kidde KN-COSM-IB will provide a low battery warning signal when the installed battery is nearing depletion. This warning consists of a single, intermittent chirp occurring approximately every 30 seconds. This signal is distinct from the smoke or carbon monoxide alarm sounds, alerting you to replace the battery promptly.
Ignoring this chirp can compromise the alarm’s ability to detect hazards. Immediately replace the battery with a fresh one of the correct type as specified in the manual. After battery replacement, test the alarm to ensure proper functionality. Consistent battery checks are vital for reliable protection.
Alarm Memory Feature
The Kidde KN-COSM-IB is equipped with an alarm memory feature, designed to inform you of a previous alarm event even after the hazard has cleared. If an alarm condition was detected while you were away or unable to hear it, the alarm will indicate this with a flashing LED.
To view the alarm memory, press the Test/Silence button. The LED will flash to indicate whether a smoke or carbon monoxide alarm was previously triggered. This feature helps ensure you are aware of potential hazards and can investigate accordingly. The memory resets after you silence the alarm.

Maintenance and Troubleshooting
Regular cleaning, battery replacement, and addressing common issues are crucial for optimal performance and longevity of your Kidde KN-COSM-IB alarm.
Regular Cleaning Procedures
To maintain the effectiveness of your Kidde KN-COSM-IB alarm, periodic cleaning is essential. Dust, dirt, or insects can interfere with the sensor’s ability to detect smoke and carbon monoxide accurately.
Vacuum the alarm’s exterior using a soft brush attachment at least every six months. Avoid using water, cleaning solvents, or detergents, as these can damage the sensor. Gently wipe the alarm casing with a damp cloth if necessary, ensuring it is completely dry afterward.
Do not disassemble the alarm for cleaning, as this will void the warranty and potentially compromise its functionality. Consistent cleaning ensures reliable operation and extends the lifespan of your safety device.
Battery Replacement Instructions
When the alarm chirps intermittently, it signals a low battery condition requiring immediate attention. Use only a fresh, approved battery – typically a 12V alkaline battery.
To replace the battery, locate the battery compartment (refer to the alarm’s diagram). Carefully remove the old battery and disconnect it from the terminal. Insert the new battery, ensuring correct polarity (+ and -).
Test the alarm immediately after battery replacement using the test button. A successful test confirms proper functionality. Dispose of the old battery responsibly, following local regulations. Regular battery checks are crucial for continuous protection.
Troubleshooting Common Issues
If the alarm frequently chirps even after battery replacement, ensure the battery is correctly installed with proper polarity. Verify the alarm isn’t exposed to excessive humidity or contaminants.
For nuisance alarms, ensure proper ventilation and eliminate potential sources of combustion. If the alarm fails to test correctly, replace the entire unit. Intermittent issues with interconnected alarms may require checking the wiring connections.
If the alarm displays an end-of-life signal, it must be replaced immediately. Refer to the manual for specific error codes and their meanings. Consistent problems warrant professional assistance.
Alarm End-of-Life Signal
The Kidde KN-COSM-IB alarm has a limited lifespan, typically around 7-10 years. After this period, the unit will emit a distinct end-of-life signal – a series of chirps or a specific tone – indicating it needs replacement.
This signal isn’t a malfunction but a crucial safety feature, as the sensor’s accuracy degrades over time. Ignoring this signal compromises your protection. Immediately replace the alarm with a new Kidde unit.
Record the date of installation to easily track the alarm’s lifespan. Do not attempt to disable or silence the end-of-life signal; replacement is the only safe solution.

Technical Specifications
This section outlines the Kidde KN-COSM-IB’s power source, detection sensitivity, operating temperature range, and physical dimensions for detailed reference.
Power Source Details
The Kidde KN-COSM-IB operates utilizing a standard 120V, 60Hz AC power supply. As a safety precaution, this alarm is also equipped with a 9V battery backup to ensure continuous protection during power outages. It’s crucial to regularly test the battery, as indicated in the maintenance section, to confirm its functionality. The alarm’s power consumption is designed for energy efficiency, minimizing electricity usage while maintaining reliable performance.
Proper battery installation is vital; only use a 9V battery that meets the specified requirements. Incorrect battery type or installation can compromise the alarm’s ability to detect smoke or carbon monoxide. The alarm will provide a low-battery warning signal, typically a chirp sound, indicating the need for replacement. Always replace the battery immediately upon hearing this warning.
Detection Sensitivity Levels

The Kidde KN-COSM-IB employs advanced detection technologies with pre-defined sensitivity levels for both smoke and carbon monoxide. Smoke detection is optimized to respond quickly to smoldering fires and fast-flaming fires, minimizing nuisance alarms from cooking or steam. Carbon monoxide detection is calibrated to trigger an alarm at CO concentrations exceeding established safety thresholds, as defined by safety standards.
These sensitivity levels are factory-set and generally do not require adjustment. However, environmental factors like humidity and airflow can influence performance. The alarm is designed to minimize false alarms while ensuring prompt detection of dangerous conditions. Regular testing, as outlined in the manual, verifies proper sensor functionality and sensitivity.
Operating Temperature Range
The Kidde KN-COSM-IB is designed to function reliably within a specified temperature range of 40°F (4.4°C) to 100°F (37.8°C). Operating outside this range may compromise the alarm’s accuracy and responsiveness. Exposure to temperatures below 40°F can affect battery performance and sensor functionality, potentially leading to delayed detection or false alarms.
Conversely, temperatures exceeding 100°F can also impact sensor calibration and overall reliability. Avoid installing the alarm in locations prone to extreme temperature fluctuations, such as near heating vents, fireplaces, or in uninsulated attics. Maintaining a stable operating temperature ensures optimal performance and longevity of the device, safeguarding against both fire and carbon monoxide hazards.
Alarm Dimensions and Weight
The Kidde KN-COSM-IB combination smoke and carbon monoxide alarm is designed with a compact profile for discreet installation in various locations. Its dimensions are approximately 5.3 inches (135 mm) in diameter and 2.4 inches (61 mm) in height. These measurements ensure compatibility with standard ceiling and wall mounting brackets.
The alarm’s weight is approximately 0.55 pounds (250 grams). This lightweight design facilitates easy handling during installation and maintenance. The relatively small size and minimal weight prevent undue stress on mounting surfaces, ensuring secure and long-lasting attachment. Accurate dimensions are crucial for planning installation and ensuring proper placement within your home.

Safety Information
This alarm is not a substitute for carefulness! Smoke and CO alarms offer early warning, but limitations exist; regular inspection and testing are vital for safety.
Important Safety Precautions
Prior to installation and use of your Kidde KN-COSM-IB alarm, carefully review all instructions. This device detects both smoke and carbon monoxide, but it’s crucial to understand its limitations. Never disregard any alarm signal; always investigate the source. Ensure all household members recognize the alarm sound and know evacuation procedures.
Do not disable the alarm to silence nuisance alarms from cooking or steam. Instead, utilize the hush feature. Regularly test the alarm to confirm functionality. This alarm is designed as an early warning system and doesn’t eliminate all risks. Maintain a fire escape plan and practice it frequently. Improper installation or maintenance can compromise performance.
Limitations of Smoke and CO Detection
Smoke alarms may not detect fires caused by steam, grease, or rapid chemical reactions. They are generally more effective at detecting smoldering fires than fast-flaming ones. Carbon monoxide alarms are unable to detect toxic gases other than CO. Placement is critical; obstructions can hinder detection.
External factors like humidity and airflow can affect performance. This alarm is not a substitute for regular appliance maintenance or proper ventilation. Battery-operated models rely on battery power; low batteries can compromise detection. Interconnected alarms depend on all units functioning correctly. Always follow safety precautions and maintain a comprehensive fire safety plan.
Recommended Inspection Frequency
To ensure reliable operation, inspect your Kidde KN-COSM-IB alarm monthly. Press the test button to verify the electronic circuitry and horn functionality. Visually check for any obstructions blocking the sensor openings. Clean the alarm regularly, as dust and debris can impair sensitivity.
Replace the batteries at least once a year, or immediately when the low-battery warning chirps. The alarm itself has a limited lifespan – typically 7-10 years. Replace the entire unit after this period, regardless of functionality. Keep a log of inspection and maintenance dates for optimal safety and peace of mind.
Warranty Information
Kidde provides a limited warranty covering defects in materials and workmanship for a specified period. Contact Kidde customer support for details and claim procedures.
Kidde Warranty Coverage
Kidde warrants that this smoke/carbon monoxide alarm will be free from defects in material and workmanship for a period of one (1) year from the date of purchase. This warranty covers defects encountered during normal residential use; it does not cover damage resulting from accident, misuse, or alteration.
During the warranty period, Kidde will repair or replace, at its option, any defective alarm upon return of the alarm with proof of purchase. This warranty is exclusive and in lieu of all other warranties, expressed or implied, including merchantability and fitness for a particular purpose.
Kidde’s liability shall not exceed the purchase price of the alarm. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
Contacting Kidde Customer Support
For assistance with your Kidde KN-COSM-IB alarm, or to inquire about warranty claims, please reach out to Kidde’s dedicated customer support team. You can contact them via phone at 1-800-880-6788, available during standard business hours.
Alternatively, you can visit the Kidde website at www.kidde.com for a wealth of resources, including FAQs, troubleshooting guides, and downloadable manuals. Their online support portal offers a convenient way to find answers to common questions and submit support requests.
When contacting support, please have your model number (KN-COSM-IB) and date of purchase readily available to expedite the process. Kidde is committed to providing excellent customer service and ensuring your safety.