usi MCN108 Installation Instructions Manual Download Page 4

BASIC SAFETY INFORMATION

• 

This combination Carbon Monoxide and Natural Gas alarm has separate alarms. This alarm is 

not designed to detect smoke, heat or any other 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.

• 

Do not paint  the alarm. Paint may clog the openings to the sensing chambers and prevent the 

unit from operating properly.

• 

Do not stand too close to the unit when the alarm is sounding. It is loud to wake you in an 

emergency. Exposure to the horn at close range may harm your hearing.

Make sure the alarm is not receiving excessively noisy power. Examples of noisy power 

could be major appliances on the same circuit, power from a generator or solar power, light 

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may cause damage to your alarm.

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grid installations, such as solar or wind derived power sources. These power sources may produce 

high peak voltages which will damage the alarm.

Do not install this alarm into an electrical circuit controlled by a dimmer or switch or ground 

fault circuit interrupter.

• 

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• 

An alarm should be centrally located outside of each separate sleeping area in the immediate 

vicinity of the bedrooms. Where bedrooms are separated and audibility of the alarm to occupants 

within the bedroom area could be seriously impaired, more than one alarm could be needed.

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escape route as the bedrooms are usually farthest from an exit. If more than one sleeping area 

exists, locate additional combination alarms in each sleeping area. If a hall is more than 40 feet 

(12 meters) long, install a combination alarm at each end.

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In general, install combination CO and Gas Alarms:

• 

WHERE YOU CAN HEAR THE ALARM FROM ALL SLEEPING AREAS.

• 

In or near bedrooms and living areas or wherever you suspect a natural gas or CO exposure is 

likely.

• 

On each level of a multilevel home.

IMPORTANT!

Installation in an improper location can affect the sensitive electronic components in this alarm. 

Please review WHERE THIS ALARM SHOULD NOT BE INSTALLED (see Page 4).
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alarm will detect natural gas primarily and carbon monoxide secondarily. Natural gas events will 

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refer to natural gas.
When on AC power, this alarm is designed to act as a continuous monitor. It is not designed for use 

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Page 3

RECOMMENDED PLACEMENT:

Page 4

NOTE:

 For any location, make sure no door or other obstruction could prevent the carbon monoxide 

or gas from reaching the alarm.

WHERE THIS ALARM SHOULD NOT BE INSTALLED

To avoid causing damage to the unit, to provide optimum protection, and to prevent 

unnecessary alarms. Do NOT locate this alarm:

• 

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areas. Installation in these areas could lead to nuisance alarms, may expose the sensor to 

substances which could damage or contaminate it, or the alarm may not be heard by people in 

other areas of the home, especially if they are sleeping.

• 

In the garage, vehicle exhaust can contain some carbon monoxide. These levels are higher when 

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levels present over time can activate the alarm and become a nuisance.

• 

In the kitchen, some gas appliances can emit a short burst of CO or gas upon startup. This is 

normal. If your CO and Natural Gas Alarm is installed too close to these appliances, it may alarm 

often and become a nuisance.

• 

Keep alarms at least 20 feet (6m) from the sources or combustion 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 placed as far 

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Ventilate these areas as much as possible. 

If you must install the alarm near a cooking or 

heating appliance, install at least 5 feet (1.5m) from appliance.

• 

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the sensor.

• 

In extremely humid areas. This alarm should be at least 10 feet (3m) from a bath or shower, 

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humidity.

• 

In very cold or very hot environments or in unheated buildings or outdoor rooms where the 

temperature can go below or above the operating range of the alarm. Temperature limits for 

proper operation are 40

o

 to 100

o

F (4.4

o

 to 37.8

o

C).

• 

In turbulent air, such as near ceiling fans, heat vents, air conditioners, fresh air returns or open 

windows. Blowing air may prevent CO or natural gas from reaching the sensors.

• 

Good ventilation is recommended when household cleaning supplies or similar contaminants 

are used.

• 

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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. 



 

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air.

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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.

Page 5

THIS ALARM WILL NOT WORK WITHOUT 120 VAC POWER AND A GOOD 

BATTERY PROPERLY INSTALLED. THE ALARM SHOULD BE TESTED WHEN 

INSTALLED AND THEN TESTED WEEKLY AFTER THAT.

INSTALLATION INSTRUCTIONS: CAUTION!! READ CAREFULLY.

Installation of this alarm must conform to the electrical codes in your area; Article 760 of 

the National Electrical Code, NFPA 72, 101; SBC (SBCCI); UBC (ICBO); NBC (BOCA): OTFDC 

(CABO), and any other local or building codes that may apply. Wiring and installation must 

be performed by a licensed electrician. Failure to follow these guidelines may result in 

injury or property damage.
This alarm must be powered by a 24-hour, 120V AC 60Hz circuit. Be sure the circuit cannot 

be turned off by a switch, dimmer or ground fault circuit interrupter. Failure to connect this 

alarm to a 24-hour circuit may prevent it from providing constant protection.
IMPORTANT: Do not subject this alarm to megger, high voltage or high-pot tests. Remove 

the  alarm(s) before high-potting tests occur on the circuit or system.  (Ref. Section 550-17, 

National Electrical Code, 2002 Edition).

ELECTRICAL SHOCK HAZARD

Turn off power to the area where you will install this alarm at the circuit breaker or fuse box 

before beginning installation. Failure to turn off the power before installation may result in 

serious electrical shock, injury or death.

CAUTION: THIS CO AND NATURAL GAS ALARM IS SEALED. THE COVER IS 

NOT REMOVABLE

!

•  A mounting bracket is provided on the back of the alarm.
•  The alarm deactivation key will not be used for this model.
•  Remove the mounting bracket from the back of the alarm by holding the mounting bracket and 

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the alarm base.

OPTIONAL TAMPER RESISTANT FEATURES:

 There are two separate tamper resistant locking 

features provided for this model. Activating one or both of these features deters someone from 

removing the alarm from the mounting bracket or removing the battery from the alarm. The 

breakaway locking pins are clearly marked and molded into the mounting bracket. Refer to the 

diagram on the next page.

TO ACTIVATE THE LOCKING FEATURES:

 Do not activate the locking features until you have 

activated the battery, mounted the alarm to the bracket and tested the alarm. Refer to OPERATION, 

TESTING & MAINTENANCE instructions on Page 6.
1.  Detach the breakaway alarm locking pin from the mounting bracket.

TO DEACTIVATE THE LOCKING FEATURES:

 To remove the alarm for cleaning or servicing or to 

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1.  Turn off AC power to the circuit.

2.  Use long nose pliers to pull the locking pin out of the hole.

3.  It is now possible to remove the alarm or replace the battery.

WIRING INSTRUCTIONS:

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switchable circuit NOT protected by a ground fault circuit interrupter.

2.  Insert the pin into the hole for the feature you are activating. Refer to the diagram below for 

correct placement.

INSERT ALARM LOCKING 

PIN HERE

INSERT BATTERY 

LOCKING PIN HERE

ALARM/BRACKET 

LOCKING PIN

BATTERY DRAWER LOCKING PIN

Summary of Contents for MCN108

Page 1: ...L GAS ALARM WITH SILENCE FEATURE THANK YOU for purchasing this combination alarm This manual includes important information regarding where to install the alarm how to operate maintenance testing and...

Page 2: ...ATELY 7 YEARS OF OPERATION FROM INITIAL POWER UP NOTE MANUFACTURER RECOMMENDS REPLACEMENT OF THIS ALARM 7 YEARS AFTER DATE OF INSTALLATION WHAT YOU SHOULD KNOW ABOUT NATURAL GAS Natural gas is a fossi...

Page 3: ...be centrally located outside of each separate sleeping area in the immediate vicinity of the bedrooms Where bedrooms are separated and audibility of the alarm to occupants within the bedroom area cou...

Page 4: ...HFWO QH W WR D IXHO EXUQLQJ VRXUFH Ventilate these areas as much as possible If you must install the alarm near a cooking or heating appliance install at least 5 feet 1 5m from appliance HVV WKDQ LQFK...

Page 5: ...nting bracket from the back of the alarm by holding the mounting bracket and WZLVWLQJ WKH DODUP LQ WKH GLUHFWLRQ LQGLFDWHG E WKH 7 67 72 5 029 DUURZ RQ WKH VLGH RI the alarm base OPTIONAL TAMPER RESIS...

Page 6: ...n silent Interconnected combination CO and natural gas alarms will only respond if a natural gas event initiated the alarm All other alarms remain silent Natural gas detection is only present in model...

Page 7: ...he battery backup will not work unless a good battery is properly installed When the alarm utilizes battery backup power the natural gas sensor will operate the alarm and will sample less frequently t...

Page 8: ...all electronic circuitry and horn are working If no alarm sounds the alarm may have a power supply failure Test the alarm weekly to assure proper operation ALARM ORIGINATION Patented Quick Find Alarm...

Page 9: ...n condition press and hold the TEST SILENCE button on any alarm for at least 10 seconds or until the blue LED turns on and then release Reset after each alarm The reset feature will reset all intercon...

Page 10: ...controlled labatory environment can produce an explosion and death NEVER use a gas UDQJH RU DQ RSHQ DPH RI DQ NLQG WR WHVW WKLV DODUP RX PLJKW DFFLGHQWDOO GDPDJH or set UH WR WKH DODUP RU WR RXU KRPH...

Page 11: ...DQHRXV RSHUDWLRQ RI VHYHUDO IXHO EXUQLQJ DSSOLDQFHV FRPSHWLQJ IRU OLPLWHG LQWHUQDO DLU Vent pipe connections vibrating loose from clothes dryers furnaces or water heaters Obstructions in or unconventi...

Page 12: ...ice and getting out of the home Turns off when the 1 beeps starts Off or Blinks On in sync with the 1 beep Condition Nuisance Alarm Recommendation If there is no hazard present verify the alarm is mou...

Page 13: ...als are making contact with the smoke alarm contacts in the battery drawer If chirp continues replace the 9V battery see User s Manual for recommended battery types 3 Chirps approx every 20 seconds Of...

Page 14: ...t PRGL FDWLRQV DOWHUDWLRQ QHJOHFW RU PLVKDQGOLQJ 7KLV DUUDQW VKDOO QRW DSSO WR DQ SURGXFW ZKLFK LV IRXQG WR KDYH EHHQ LPSURSHUO LQVWDOOHG VHW XS RU XVHG LQ DQ ZD QRW LQ DFFRUGDQFH ZLWK WKH instruction...

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