usi MCN108 Installation Instructions Manual Download Page 11

Page 10

BACKUP BATTERY REPLACEMENT

Disconnect AC power before changing battery. Shock hazard exists if AC power is 

miswired.

The alarm uses a 9 Volt battery. The battery should last for at least one year under normal operating 

conditions. The alarm has a low battery indicator, an audible beep or chirp. It will operate at approx. 

40 second intervals for a minimum of 7 days. When this indication occurs, replace the battery with 

an Alkaline type (Energizer #522, Duracell #MN1604, Zeus 9V), or Lithium type (Energizer LA522, 

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OPTIONAL BATTERY DRAWER TAMPER LOCKING PIN: To make your battery drawer tamper 

resistant, a locking pin has been provided (breakaway part on mounting bracket).
NOTE: If this feature has been activated, you will need to deactivate it by removing the battery 

drawer tamper pin located at side of battery drawer. Refer to Page 5.
Pull the QUICK DRAW

(R) 

battery drawer open and remove the battery. While observing polarity, 

push the replacement battery into the battery drawer until it is held securely in place. Carefully 

close  the battery drawer and reinstall the tamper pin.
Test the alarm by pushing the TEST button on the alarm cover until the alarm sounds, then 

release.

REPAIRS AND SERVICES

If this alarm is defective in any way, do not tamper with it. Return the alarm for servicing. See warranty 

for instructions. There will be a service charge for repairing out of warranty alarms.

WEEKLY TESTING
This alarm is designed to act as a monitor, not for use as a short-term testing device, to 

perform a quick check for the presence of CO or gas. WARNING: Natural gas (methane) 

is highly explosive. An attempt to test the unit by exposing it to natural gas outside of a 

controlled labatory environment can produce an explosion and death. NEVER use a gas 

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 or set 

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operation as required by ANSI/UL2034 Standard for Safety. If, at any time, you test the alarm and 

it does not perform as described, replace it immediately.     

It is important to test this alarm every week to make sure it is working properly.

USING THE TEST FEATURE:

Press and release the TEST button on the alarm cover.
During testing, you will hear: 4 beeps (red LED on), 5 second pause, 1 beep (blue LED on).

If the alarm does not sound properly:

1.  Make sure the AC power is applied and the battery is fresh and installed correctly.
2.  Test the alarm again.
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or thumb. Use of any other instrument(s) is strictly prohibited.

REGULAR MAINTENANCE

CLEANING YOUR ALARM:

DO NOT use spray cleaning chemicals or insect sprays directly on or near the alarm. DO NOT 

paint over the alarm. Doing so may permanently damage the alarm.
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based cleaners, paints, varnishes, most aerosol sprays including compressed gas dusters or any 

other chemical on or near your alarm. 

AFTER CLEANING, REINSTALL YOUR ALARM. TEST 

YOUR ALARM BY USING THE TEST BUTTON.

Page 11

CO AND NATURAL GAS ALARM LIMITATIONS

Alarms have limitations. Like any other electronic device, CO and Natural Gas alarms are not 
foolproof.
CO and Natural Gas alarms have a limited operational life. Your alarm must be tested weekly, 
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test reveals a malfunction, immediately have the unit replaced (see last page for warranty 
information).
CO and Natural Gas alarms can only sense CO which reaches the alarm’s sensor. Carbon monoxide 
may be present in other areas without reaching the alarm.
CO or gas could be present on one level of the home and not reach the alarm installed on a different 
level. For example, CO or gas in the basement may not reach an alarm on the second level, near 
the bedrooms. For this reason, we recommend you provide complete coverage by placing a CO 
and Natural Gas alarm on every level of the home.
CO and Natural Gas alarms are not a substitute for property, disability, life or other insurance of 
any kind. Appropriate coverage is your responsibility.

POTENTIAL SOURCES OF CO IN THE HOME

Fuel-burning appliances, such as;

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or cooktops, gas clothes dryers.

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 corroded or disconnected water heaters, vent pipes, 

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Improper use of appliances/devices;

 operating a barbeque grill or vehicle in an enclosed area 

(such as a garage or screened porch).

Transient CO Problems: 

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conditions and other special circumstances.

The following conditions can result in transient CO situations:

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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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• 

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.

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3.  Temperature inversions which can trap exhaust close to the ground.
4.  A car idling in an open or closed attached garage or near a home.

HOW CAN I PROTECT MY FAMILY FROM CO POISONING?

This alarm is an excellent means of protection. It monitors the air and sounds a loud alarm before 

carbon monoxide levels become threatening to the average, healthy adult.

An alarm is not a substitute for proper maintenance of home appliances.

To help prevent CO problems and reduce the risk of CO poisoning:

• 

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• 

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HVAC companies offer appliance inspections for a nominal fee.

• 

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appliances. Make sure appliances are vented to the outside. Do not grill or barbecue indoors 

or in garages or screen porches.

• 

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for a backdraft. Look for cracks on furnace heat exchangers.

• 

Check the house or garage on the other side of a shared wall.

• 

Keep windows and doors open slightly. If you suspect that CO is escaping into your home, 

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Page 12

GAS

BLUE LED

AUDIBLE & VISUAL SIGNALS

POWER

GREEN LED

HORN

OPERATIONAL SUMMARY

CONDITION / RECOMMENDATION

Silent

Off

On and Blinks

Off approx

every 20

seconds

Off

Condition:

 AC power is present. DC power is present.

Recommendation:

 None

CO

RED LED

Silent

(alarmed

previously)

On and Blinks

Off approx

every 20

seconds

Off and Blinks

On approx.

every 5

seconds until 

reset

Silent

Off

Off and Blinks

On approx

every 40

seconds

Off

Condition:

 Alarm is powered by battery backup. AC Power is not  

present.

Recommendation:

 Check the breaker or fuse box for power. If the breaker 

or fuse box looks normal, call a licensed electrician for assistance.

4 Beeps,

5 second pause, 

1 beep

Blinks On in

sync with

the 1 beep

Turns off

when the

3 beeps start

Blinks On in sync 

with the cycle of

4 beeps and

turns off

Condition:

 The test/silence button has been pressed. The test sequence 

lasts for approx. 7 seconds.

Recommendation:

 None

Off

*See below

Off

Horn does not

sound when

other alarms

are active

or when 

interconnected

alarm’s

test/reset

button is

pressed

4 Beeps,

5 second pause, 

repeat

Off

Blinks On in

sync with

4 beeps

Condition:

 Originating CO Alarm.

Recommendation:

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sounds by calling an Emergency Service and getting out of the home.

4 Beeps,

5 second pause, 

repeat

Off

Turns off

when the

4 beeps start

Off

Condition:

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Recommendation:

 An interconnected CO alarm has sensed CO, causing 

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if an alarm sounds by calling an Emergency Service and getting out of 

the home.

Turns off

when the

4 beeps start

1 Beep,

2 second pause, 

repeat

Off

Blinks On

in sync

with the

1 beep

Condition:

 Originating GAS Alarm.

Recommendation:

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sounds by calling an Emergency Service and getting out of the home.

1 Beep,

2 second pause, 

repeat

Off

Turns off

when the

1 beeps starts

Off

Condition:

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Recommendation:

 An interconnected GAS alarm has sensed GAS, 

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precautions if an alarm sounds by calling an Emergency Service 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 

mounted in the correct location (see User’s Manual). Reset alarm as 

instructed below.

Horn sounds

when no

hazard is

present

Off or Blinks

On in sync

with 4 beeps

Turns off

 when the

beeps start

4 Beeps,

5 second pause, 

repeat

Blinks

On in sync

with 4 beeps

Off

Turns off

 when the

4 beeps start

Condition:

 CO alarm when cause of alarm is known and poses no threat.

Recommendation:

 The CO alarm Silence Feature can be activated by pressing 

and releasing the Test/CO Silence button on the initiating alarm while in alarm 

condition. The alarm will remain silent for approx. 5 minutes (with the red LED 

blinking on approx. every 10 seconds), depending on the level of CO detected. 

If CO levels drop below alarm levels, the alarm will remain silent and return to 

normal operation. If CO levels remain constant or increase, this indicates a 

potentially dangerous situation and the horn will sound again. Ventilate area.

Off and

Blinks On

approx.

every 5

seconds

until reset

Condition:

 One or more alarms not responding to interconnected alarm.

Recommendation:

 Press and hold the alarm Test/Silence button for at least 

5 seconds. If still no alarm, turn off AC Power at the circuit breaker or fuse 

box and disconnect the alarm from the mounting bracket and make sure 

the connector plug is securely attached on units that did not alarm. If still no 

alarm, have a licensed electrician make sure the yellow wire is not mistakenly 

or accidentally connected to the white (neutral) wire.

Condition:

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Recommendation:

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V\VWHPLWLVGLI¿FXOWWRGHWHUPLQHZKLFKDODUPLQLWLDWHGWKHDODUPVWRVRXQG

The QUICK FIND® feature will immediately allow you to locate the originating 

alarm (once the alarms have stopped sounding). To initiate QUICK FIND®,  

press and hold the test/silence button on any alarm until the test sequence 

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sequence is designated by the alarm type. Once this test sequence ends, 

the originating alarm continues to sound for approximately 60 seconds.

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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