Note:
Head removal after the tamper resistant capability has been activated first requires removal of the decorative
ring.
The tamper resistance can be defeated by breaking and removing the plastic lever from the base. However, this perma-
nently disables the tamper resistant capability.
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.
A78-1175-03
Figure 3A. Activating Tamper-resistance Feature
Figure 3B. Removing Detector Head from Base
N550-04-00
4
I56-636-01
© Notifier 1993
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 stan-
dard 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 detector is usu-
ally located. For this reason, there may be large delays in detecting a smoldering fire with either an ionization-type de-
tector or a photoelectronic-type detector. Either one of them may alarm only after flaming has initiated, which will gener-
ate 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 building. 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. Ioniza-
tion 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 specific 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 detec-
tors 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, demand-
ing 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 service 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.
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