To remove the detector from the base after it has been made tamper resistant, remove the decorative ring by rotat-
ing it in either direction and pulling it away from the base. Then, insert a small screwdriver (Figure 4B) into the notch
and press the plastic lever toward the mounting surface. Rotate the detector counterclockwise and remove it.
Figure 4A. Activating Tamper-resistance Feature Figure 4B. Removing the Detector Head from the Base
PLASTIC LEVER
BREAK TAB AT
DOTTED LINE BY
TWISTING TOWARD
CENTER OF BASE.
USE SMALL-BLADED
SCREWDRIVER TO
PUSH PLASTIC LEVER
IN DIRECTION OF
ARROW.
WARNING
LIMITATIONS OF SMOKE DETECTORS
This smoke detector used with this base is designed to activate and initiate emergency action, but will do so only
when used in conjunction with an authorized fire alarm system. This detector must be installed in accordance with
NFPA standard 72.
Smoke detectors will not work without power. AC or DC powered smoke detectors will not work if the power
supply is cut off for any reason.
Smoke detectors will not sense fires which start where smoke does not reach the detectors. Smoldering
fires typically do not generate a lot of heat which is needed to drive smoke up to the ceiling where the smoke detec-
tor is usually located. For this reason, there may be large delays in detecting a smoldering fire with either an ioniza-
tion-type detector or a photoelectronic-type detector. Either one of them may alarm only after flaming has initiated,
which will generate the heat needed to drive the smoke to the ceiling.
Smoke from fires in chimneys, in walls, on roofs, or on the other side of a closed door may not reach the smoke
detector and alarm it. A detector cannot quickly detect, or sense at all, a fire developing on another level of a build-
ing. For this reason, detectors shall be located on every level and in every bedroom within a building.
Smoke detectors have sensing limitations, too. Ionization detectors and photoelectronic detectors are required
to pass fire tests of the flaming and smoldering types. This is to ensure that both can detect a wide range of fires.
Ionization detectors offer a broad range of fire-sensing capability, but they are somewhat better at detecting fast-
flaming fires than slow-smoldering fires. Photoelectronic detectors sense smoldering fires better than flaming fires,
which have little, if any, visible smoke. Because fires develop in different ways, and are often unpredictable in their
growth, neither type of detector is always best, and a given detector may not always provide early warning of a spe-
cific type of fire.
In general, detectors cannot be expected to provide warnings for fires resulting from inadequate fire protection prac-
tices, violent explosions, escaping gases that ignite, improper storage of flammable liquids like cleaning solvents
that ignite, other similar safety hazards, arson, smoking in bed, children playing with matches or lighters, etc.
Smoke detectors used in high air velocity conditions may have a delay in alarm due to dilution of smoke densities
created by frequent and rapid air exchanges.Additionally, high air velocity environments may create increased dust
contamination, demanding more frequent detector maintenance.
Smoke detectors cannot last forever. Smoke detectors contain electronic parts. Even though detectors are made
to last over 10 years, any part can fail at any time. Therefore, smoke detectors shall be replaced after being in ser-
vice for 10 years. The smoke detector system that this detector is used in must be tested regularly per NFPA 72.
This smoke detector should be cleaned regularly per NFPA 72 or at least once a year.
N550-03-00 4 I56-647-01
© Notifier 1993
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