ADEMCO Accord User Instructions - Page 9

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Intruders may gain access through unprotected openings or

have the technical sophistication to bypass an alarm sensor or

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disconnect an alarm warning device.

Intrusion detectors (e.g. passive infrared detectors), smoke

detectors, and many other sensing devices will not work

without power. Battery operated devices will not work

without batteries, with dead batteries, or if the batteries are

not put in properly. Devices powered solely by AC will not

work if their AC power supply is cut off for any reason,

however briefly.

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A user may not be able to reach a P.A. or emergency button

quickly enough.

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While smoke detectors have played a key role in reducing

residential fire deaths, they may not activate or provide early

warning for a variety of reasons in as many as 35% of all

fires. Some of the reasons smoke detectors used in

conjunction with this System may not work are as follows.

Smoke detectors may have been improperly installed and

positioned. Smoke detectors may not sense fires that start

where smoke cannot reach the detectors, such as in chimneys,

in walls, or roofs, or on the other side of closed doors.

Smoke detectors also may not sense a fire on another level of

a residence or building. A second floor detector, for example,

may not sense a first floor or basement fire. Moreover,

smoke detectors have sensing limitations. No smoke detector

can sense every kind of fire every time. In general, detectors

may not always warn about fires caused by carelessness and

safety hazards like smoking in bed, violent explosions,

escaping gas, improper storage or flammable materials,

overloaded electrical circuits, children playing with matches,

or arson. Depending on the nature of the fire and/or the

location of the smoke detectors, the detector, even if it

operates as anticipated, may not provide sufficient warning to

allow all occupants to escape in time to prevent injury or

death.

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Passive Infrared Motion Detectors can only detect intrusion

within the designed ranges as diagrammed in their installation

manual. Passive Infrared Detectors do not provide

volumetric area protection. They do create multiple beams of

protection, and intrusion can only be detected in unobstructed

areas covered by the beams. They cannot detect motion or

intrusion that takes place behind walls, ceilings, floors,

closed doors, glass partitions, glass doors, or windows.

Mechanical tampering, masking, painting or spraying of any

material on the mirrors, windows or any part of the optical

system can reduce their detection ability. Passive Infrared

Detectors sense changes in temperature; however, as the

ambient temperature of the protected area approaches the

temperature range of 32–40 °C, the detection performance

can decrease.

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Alarm warning devices such as sirens, bells or horns may not

alert people or wake up sleepers who are located on the other

side of a closed or partly open doors. If warning device sound

on a different level of the residence from the bedrooms, then

they are less likely to waken or alert people inside the

bedrooms. Even persons who are awake may not hear the

warning if the alarm is muffle by noise from a stereo, air

conditioner or other appliances, or by passing traffic. Finally,

alarm warning devices, however loud, may not warn hearing-

impaired people or waken deep sleepers.

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Telephone lines needed to transmit alarm signals from a

premises to a central monitoring station may be out of