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Good ventilation is recommended when household cleaning supplies or similar contaminants
are used.

Excessive spillage or reverse venting of fuel-burning appliances caused by outdoor ambient
conditions, such as:

Wind direction and/or velocity, including high gusts of wind. Heavy air in the vent pipes (cold/
humid air with extended periods between cycles).

Negative pressure differential resulting from the use of exhaust fans.

Simultaneous operation of several fuel-burning appliances competing for limited internal air.

Vent pipe connections vibrating loose from clothes dryers, furnaces or water heaters.

Obstructions in or unconventional vent pipe designs which can amplify the above situations.

HOW TO INSTALL THIS CO AND GAS ALARM

IMPORTANT: Read all instructions before using this product.

1. Determine the best location for your CO and Gas Alarm.
2. Your alarm is equipped to be mounted as a direct plug-in unit. The unit can be plugged

directly into a wall outlet.

3. Activate the 9 Volt battery. Remove and discard the pull tab. Make sure the battery door is closed

and latched.

4. The green power LED should be on continuously. It may take up to 3 minutes for the alarm to

begin monitoring for CO and gas.

5. Test the alarm following installation and weekly thereafter.

WHAT YOU SHOULD DO IF THE ALARM SOUNDS

Never disconnect your CO and Gas Alarm to silence an alarm. The alarm will automatically sense
when the level of CO and natural gas in the air falls below the danger level. You should stay outside
the residence in fresh air until the alarm is silenced. When the alarm sounds, do not stand too close
to the alarm. The sound produced by the alarm is loud because it is designed to awaken a person in
an emergency. Prolonged exposure to the alarm at a close distance may be harmful to your
hearing.

Two self-adhesive labels have been provided with instructions indicating what to do if the alarm
sounds. Add the phone numbers of our emergency services provider and a qualified technician
to each label. Place one of the labels in a visible area next to the alarm and place the other label
near a source of fresh air which will be used as a gathering place if the alarm sounds.

Page 5

READ CAREFULLY.

THIS UNIT IS SEALED. THE ALARM COVER IS NOT REMOVABLE

!

Leave your CO and Gas Alarm plugged in year-round. CO and gas problems can occur any
time during the year and this alarm can only alert you if it is plugged in and receiving power.

This Alarm

 i

s intended for use in a standard, unswitched 120VAC wall outlet. It is not intended

for use in extension cords, power strips or outlets controlled by a switch or dimmer. These may
not provide continuous power to the unit. When fully powered, it samples the air continuously. A
microchip inside the unit stores each reading and remembers the levels it has been exposed to
over time. The unit goes into alarm mode when it has been exposed to a "critical" level.

Test the alarm once a week. If the alarm ever fails to test correctly, have it replaced immediately.
If the alarm is not working properly, it cannot alert you to a problem.

This combination CO and Natural Gas Alarm is intended for residential use and is not suitable
for use in hazardous locations as defined in the NFPA 70, National Electrical Code.

This unit must be powered by a 24 hour circuit. Be sure the circuit cannot be turned off by a
switch, dimmer or ground fault circuit interrupter (GFCI). Failure to connect this unit to a 24
hour circuit may prevent it from providing constant protection.

This alarm must have AC or battery power to operate. If AC power fails and the battery is dead
or missing, the alarm cannot operate.

The alarm will check for the presence of gas at the sensor less frequently when powered by
the backup battery. Gas could be present during the period between checks without going into
alarm, especially during a condition that results in a rapid buildup of gas.

This product is intended for use in ordinary indoor locations or family living units. It is not designed
to measure CO levels in compliance with Occupational Safety and Health Administration (OSHA)
commercial or industrial standards. Individuals with medical conditions which may make them
more sensitive to carbon monoxide may consider using warning devices which provide audible
and visual signals for carbon monoxide concentrations under 30 ppm. For additional information
on carbon monoxide and your medical condition, contact your physician.

Summary of Contents for MCN400

Page 1: ...t Levels of CO Cause anAlarm 2 Basic Safety Information 3 Recommended Location ofAlarms 4 Avoid These Locations 4 How to Install 5 Reset Feature 6 Operation Alarm Characteristics 6 What To Do If The A...

Page 2: ...MINUTES This product is intended for use in ordinary indoor locations of family living units It is not designed to measure compliance with Occupational Safety and HealthAdministration OSHA commercial...

Page 3: ...er gas Carbon monoxide and natural gas may be present in other areas The CO and Natural Gas Alarm will only indicate the presence of CO or natural gas which reaches the sensor The CO and Natural Gas A...

Page 4: ...n particles stove furnace water heater space heater if possible In areas where a 20 foot 6m distance is not possible in modular mobile or smaller homes for example it is recommended the alarm be place...

Page 5: ...which will be used as a gathering place if the alarm sounds Page 5 READ CAREFULLY THIS UNIT IS SEALED THE ALARM COVER IS NOT REMOVABLE Leave your CO and Gas Alarm plugged in year round CO and gas pro...

Page 6: ...ously detected CO and had alarmed The red LED is off and blinks on approx every 5 seconds until reset Follow the reset instructions to remove the latching LED see below GAS ALARM LATCHING LED INDICATO...

Page 7: ...n return to normal operation It will continue to monitor the air for CO Ventilate area After up to 5 minutes depending on the level of CO detected if CO levels remain potentially dangerous the horn wi...

Page 8: ...memory reading is cleared The alarm will chirp once to indicate the reset is now complete The screen will temporarily display 000 when the peak CO level is reset and then return to after several seco...

Page 9: ...install smoke alarms even though carbon monoxide can be generated by a fire CO and Gas Alarms are not a substitute for property disability life or other insurance of any kind Appropriate coverage is y...

Page 10: ...nies and HVAC companies offer appliance inspections for a nominal fee Make regular visual inspections of all fuel burning appliances Check appliances for excessive rust and scaling Also check the flam...

Page 11: ...lete MCND401 and MCND601 Series only To reset the peak CO memory press and hold the PEAK RESET button for 10 seconds until the peak level is cleared The alarm will chirp once to indicate the reset is...

Page 12: ...of this Warranty contact Customer Service at 1 800 390 4321 Ext 238 for current postage and handling fees USI DOES NOT WARRANT AND SPECIFICALLY DISCLAIMS ANY WARRANTY WHETHER EXPRESS OR IMPLIED OF FI...

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