System Sensor 2112_24D and 2112_24TD Photoelectronic - Manual (Page 4)

D200-62-00 4 I56-932-07
© System Sensor 1998
Three-Year Limited Warranty
System Sensor warrants its enclosed smoke detector to be free from defects 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 obligation 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 work-
manship 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, modi-
fications, or alterations occurring after the date of manufacture. In no case shall the
Company be liable for any consequential or incidental damages for breach of this or
any other Warranty, expressed or implied whatsoever, 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 ex-
clusion 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 action, 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. (For installation
in Canada, refer to CAN/ULC-S524-M91, Standard for the Installation of Fire Alarm
Systems, and CEC Part 1, sec. 32.)
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 delays 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, de-
tectors shall be located on every level and in every bedroom within a building.
Smoke detectors have sensing limitations, too. Ionization detectors and photo-
electric 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 detec-
tors offer a broad range of fire sensing capability but they are somewhat better at detecting fast flaming fires than slow smoldering fires. Photoelectric 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 practices, violent explosions, escaping gases which ignite,
improper storage of flammable liquids like cleaning solvents which ignite, other sim-
ilar 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. Ad-
ditionally, high air velocity environments may create increased dust contamination,
demanding more frequent maintenance.
To keep your equipment in excellent working order, ongoing maintenance is re-
quired per the manufacturer’s recommendations and UL and NFPA standards. At
a minimum, the requirements of Chapter 7 of NFPA 72, the National Fire Alarm
Code, shall be followed. A preventative maintenance agreement should be arranged
through the local manufacturer’s representative. Though smoke detectors are de-
signed for long life, they may fail at any time. Any smoke detector, fire alarm equip-
ment, or any component of that system which fails shall be repaired or replaced as
soon as possible.
WARNING
The Limitations of Property Protection Smoke Detectors
REMOVABLE
HOUSING
REMOVABLE
SCREEN
SENSING CHAMBER
COVER
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 2112/24TD(A) only) Before removing the
detector 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/
24TD(A) only).
2. Vacuum the screen carefully without removing it.
3. Remove screen assembly, pulling straight out (see Fig-
ure 5).
4. Remove the sensing chamber cover.
5. Clean the sensing chamber by vacuuming or blowing
out dust and particles.
6. Replace the sensing chamber cover, aligning the arrow
on the cover top with the arrow on the printed circuit
board.
7. Replace the screen by placing the screen assembly over
the sensing chamber cover and twisting until it snaps
into place.
8. Replace the housing by aligning the three triangular
slots on the base with their counterparts on the hous-
ing. Gently press the housing until it locks in place.
Check to make sure that the thermistors are in the up-
right position (2112/24TD(A)).
9. Reinstall the detector.
10. Notify the proper authorities that the system is back in
operation.