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Combination Smoke Alarm and Carbon Monoxide Alarm Helpful Hints

The combination smoke alarm and carbon monoxide alarm is suitable as a Single Station and/or Multiple Station (24 devices) alarm. This alarm was designed to detect both smoke and carbon monoxide from any source of combustion in a residential environment. It is not designed for use in a recreational vehicle (RV) or boat. It is designed to operate on 120 volts of AC power, with fresh batteries as backup.

Smoke Alarm

The smoke alarm monitors the air for products of combustion that are produce when something is burning or smoldering. When smoke particles in the smoke sensor reach a specified concentration, the alarm/voice message warning system will sound, and be accompanied by the flashing red LED light. The smoke alarm takes precedence when both smoke and carbon monoxide are present.

Carbon Monoxide (CO) Alarm

The Carbon Monoxide (CO) alarm monitors the air for the presence of CO. It will alarm when there are high levels of CO present, and when there are low levels of CO over a longer period of time. When a CO condition matches either of these situations, the alarm/voice message warning system will sound, and be accompanied by the flashing red LED light. The carbon monoxide sensor uses an electrochemical technology.
Caution: This alarm will only indicate the presence of carbon monoxide gas at the sensor. Carbon monoxide gas may be present in other areas.

Individuals with medical problems may consider using warning devices which provide audible and visual signals for carbon monoxide concentrations under 30 ppm.

Smart Hush Control

The HUSH feature has the capability of temporarily desensitizing the smoke alarm circuit for approximately 9 minutes. This feature is to be used only when a known alarm condition, such as smoke from cooking, activates the alarm. When the unit is in alarm, you can put your Smoke/CO Alarm in HUSH mode by pushing the test/reset button. If the smoke is not too dense, the alarm will silence immediately, the unit will verbally announce “HUSH MODE ACTIVATED”, and the green LED will flash every 2 seconds for approximately 9 minutes. This indicates that the smoke alarm is in a temporarily desensitized condition. Your Smoke/CO Alarm will automatically reset after approximately 9 minutes. When the unit returns to normal operation after being in HUSH mode, it will verbally announce, “Hush mode cancelled”, and sound the alarm if smoke is still present. The HUSH feature can be used repeatedly until the air has been cleared of the condition causing the alarm. While the unit is in HUSH mode, pushing the test/reset button on the alarm will also end the HUSH period.

NOTE: DENSE SMOKE WILL OVERRIDE THE HUSH CONTROL FEATURE AND SOUND A CONTINUOUS ALARM.

Alarm/Voice Message Warning System

The Alarm/Voice message warning system alerts you of the following conditions in the manner described below, thus eliminating any confusion over which alarm is sounding:

  • Fire: The alarm/voice pattern is three long alarm beeps followed by the verbal warning message, “Fire!” This pattern is repeated until the smoke is eliminated. The red LED light will flash while in alarm/voice mode.
  • Carbon Monoxide: The alarm/voice pattern is four short alarm beeps followed by the verbal warning message, “Warning! Carbon Monoxide!” This continues until the unit is reset or the CO is eliminated. While powered by battery only, after four minutes the alarm/voice pattern will sound once every minute. The red LED will flash while in alarm/voice mode.
  • Low Battery: When the batteries are low and need replacing the red LED will flash and the unit will “chirp” one time, followed by the warning message, “Low Battery.” This cycle will occur once every minute and will continue for at least seven days. Under battery power, the “Low Battery” voice only occurs once every 15 minutes.

Battery Replacement

Alarm Removal

IF TAMPER RESIST FEATURE HAS BEEN ACTIVATED, REFER TO TAMPER RESIST FEATURE DESCRIPTION ON PAGE 17 OF THE USER GUIDE FOR REMOVAL INSTRUCTIONS. If you have misplaced the user guide, you can download the pdf.

Remove the alarm from the mounting bracket by rotating the alarm in the direction of the “OFF” arrow on the cover.

Battery Replacement

If any form of battery failure is detected the red LED light will flash and the unit will “chirp” one time, followed by the warning message, “LOW BATTERY”. This cycle will occur once every minute and will continue for at least seven days. On battery power, the “LOW BATTERY” voice occurs once every 15 minutes.

If the red LED light flashes along with a chirp every 30 seconds, and is not followed by the voice message “LOW BATTERY” as described above, and if the green LED flashes twice per second (AC power only) your unit has malfunctioned. Call Kidde’s toll free Product Support Line at 1-800-880-6788 for instructions on how to return the unit.

Battery Installation and Removal

To replace or install the batteries slide the battery door in the direction indicated on the cover of the alarm. When installing new batteries into the carrier, make sure that the polarity matches the markings printed on the inside of the battery compartment, press the battery reminder finger down into the battery compartment and install the battery (see Figure 6).

Completely slide the battery door to the closed position. A missing or improperly installed battery will prevent the battery door from closing and result in improper alarm operation.

Replace batteries with one of the following approved brands:

These batteries can be purchased at your local retailer.

WARNING! Use only the batteries specified. Use of different batteries may have a detrimental effect on the Smoke/CO alarm.

False Readings

When household cleaning supplies or similar contaminates are used, the area must be well ventilated. The following substances can effect the CO sensor and may cause false readings and damage to the sensor:

  • Methane
  • Propane
  • Iso-butane
  • Iso-propanol
  • Ethyl acetate
  • Hydrogen sulfide
  • Sulfide dioxides
  • Alcohol based products
  • Paints
  • Thinner
  • Solvents
  • Adhesives
  • Hair spray
  • After shave
  • Perfume
  • Some cleaning agents

Smoke alarms are designed to minimize false alarms. Cigarette smoke will not normally set off the alarm, unless the smoke is blown directly into the alarm. Combustion particles from cooking may set off the alarm if located too close to the cooking area. Large quantities of combustible particles are generated from spills or when broiling. Using the fan on a range hood which vents to the outside (non recirculating type) will also help remove these combustible products from the kitchen.

Click here to view/download the instructions for this combo smoke alarm and carbon monoxide alarm.

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