System Sensor 2112_24B and 2112_24TB Photoelectronic - Manual (Page 4)

D200-62-00 4 I56-932-01
© System Sensor 1996
Three-Year Limited Warranty
System Sensor warrants its enclosed smoke detector to be free from de-
fects in materials and workmanship under normal use and service for a
period of three years from date of manufacture. System Sensor makes no
other express warranty for this smoke detector. No agent, representative,
dealer, or employee of the Company has the authority to increase or alter
the obligations or limitations of this Warranty. The Company’s obliga-
tion of this Warranty shall be limited to the repair or replacement of any
part of the smoke detector which is found to be defective in materials or
workmanship under normal use and service during the three year period
commencing with the date of manufacture. After phoning System Sensor’s
toll free number 800-SENSOR2 (736-7672) for a Return Authorization
number, send defective units postage prepaid to: System Sensor, Repair Department, RA #__________, 3825 Ohio Avenue, St. Charles, IL 60174.
Please include a note describing the malfunction and suspected cause
of failure. The Company shall not be obligated to repair or replace units
which are found to be defective because of damage, unreasonable use,
modifications, or alterations occurring after the date of manufacture. In no
case shall the Company be liable for any consequential or incidental dam-
ages for breach of this or any other Warranty, expressed or implied what-
soever, even if the loss or damage is caused by the Company’s negligence
or fault. Some states do not allow the exclusion or limitation of incidental
or consequential damages, so the above limitation or exclusion may not
apply to you. This Warranty gives you specific legal rights, and you may
also have other rights which vary from state to state.
This smoke detector is designed to activate and initiate emergency ac-
tion, but will do so only when it is 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.
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 the smoke up to the ceiling where the
smoke detector is usually located. For this reason, there may be large de-
lays in detecting a smoldering fire with either an ionization type detector
or a photoelectric 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(s) may not reach the smoke detector and alarm it. A detector
cannot detect a fire developing on another level of a building quickly or
at all. For these reasons, detectors shall be located on every level and in
every bedroom within a building.
Smoke detectors have sensing limitations, too. Ionization detectors and
photoelectric detectors are required to pass fire tests of the flaming and
smoldering type. This is to ensure that both can detect a wide range of types of fires. Ionization detectors offer a broad range of fire sensing ca-
pability but they are somewhat better at detecting fast flaming fires than
slow smoldering fires. Photoelectric detectors sense smoldering fires bet-
ter than flaming fires which have little, if any, visible smoke. Because fires
develop in different ways and are often unpredictable in their growth, nei-
ther 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 practices, violent explosions,
escaping gases which ignite, improper storage of flammable liquids like
cleaning solvents which ignite, other similar safety hazards, arson, smok-
ing 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 maintenance.
Smoke detectors cannot last forever. Smoke detectors contain electronic
parts. Even though smoke 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 detec-
tor 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.
WARNING
The Limitations of Property Protection Smoke Detectors
REMOVABLE
HOUSING
REMOVABLE
SCREEN
BASE
SENSING
CHAMBER
A78-2565-00
Figure 5. Removal of Cover and Screen for Cleaning
Maintenance
NOTE: Before removing the detector, notify the proper
authorities that the smoke detector system is un-
dergoing maintenance and will be temporarily out
of service. Disable the zone or system undergoing
maintenance to prevent unwanted alarms.
NOTE: (Model 2112/24TB only) Before removing the de-
tector cover, note the position of the thermistors.
Make sure the thermistors are not bent over when
the housing is replaced.
1. Remove the detector housing by gently prying the four
housing tabs on the bottom of the base with a small-
bladed screwdriver and pull the housing from the base.
Use caution to avoid damaging the thermistors (2112/
24TB only).
2. Vacuum the screen carefully without removing it.
3. Remove screen assembly, pulling straight out (Figure 5).
4. Clean the sensing chamber by vacuuming or blowing out
dust and particles.
5. Replace the screen by orienting it so that the arrow
on the top aligns with the arrow on the printed circuit
board. Carefully press the screen assembly onto the
sensing chamber, making sure it fits tightly.
6. Replace the housing by aligning the three triangular
slots on the base with their counterparts on the housing.
Gently press the housing until it locks in place. Check
to make sure that the thermistors are in the upright po-
sition (2112/24TB).
7. Reinstall the detector.
8. Notify the proper authorities that the system is back in
operation.