System Sensor 3251 Intelligent - Manual (Page 2)

D. Direct Heat Method (Hair Dryer of 1000-1500 watts).
A hair dryer of 1000-1500 watts should be used to test the thermistors.
Direct the heat toward either of the two thermistors (see figure 4),
holding the heat source approximately 12 inches from the detector in
order to avoid damaging the plastic housing. The detector will reset
only after it has had sufficient time to cool. Make sure both ther-
mistors are tested individually.
Both smoke and heat detection testing are recommended for verifying sys-
tem protection capability.
A sensor that fails any of these tests should be cleaned as described under
CLEANING and retested. If the sensor fails after cleaning, it must be re-
placed and returned for repair. When testing is complete, restore the sys-
tem to normal operation and notify the proper authorities that the system
is back in operation.
Cleaning
Before cleaning, notify the proper authorities that the system is undergo-
ing maintenance, and will be temporarily out of service. Disable the sys-
tem to prevent unwanted alarms.
1. Remove the sensor to be cleaned from the system.
2. Remove the sensor cover using a small standard screwdriver to release
each of the four cover removal tabs that hold the cover in place. Use
caution to avoid damaging the thermistors.
3. Vacuum the outside of the screen without removing it.
4. Remove the outer chamber assembly being careful not to damage the
thermistors. Pull the assembly straight away from the sensing chamber
until it snaps out of place. Use a vacuum or clean compressed air to
clean the inside of the outer chamber assembly.
5. Use a vacuum or clean compressed air to remove dust and debris from
the sensing chamber.
6. Reinstall the outer chamber assembly. Align the arrow on the outer
chamber assembly with the arrow on the printed circuit board. Push
the outer chamber assembly over the sensing chamber until it snaps
into place. Check to make sure that the screen is in the screen contact.
7. Reinstall the sensor cover. Use the thermistors and LED’s to align the
cover with the sensor. Snap the cover into place. Check to make sure
the thermistors are in the upright position.
8. Reinstall the sensor.
9. When all the sensors have been cleaned, restore system operation for
testing purposes and test the sensor(s) as described in the TESTING
section of this manual.
P
O
D
N
O
T
IN
T
A
TEST
MAGNET
PAINTED
SURFACE
MAGNET TEST
MARKER
LED STATUS
INDICATORS
SENSOR
TEST
MAGNET
SURFACE
PAINTED
Figure 3. Test magnet position:
COVER
COVER REMOVAL
TABS
OUTER CHAMBER
ASSEMBLY
SENSING
CHAMBER
THERMISTOR
Three-Year Limited Warranty
System Sensor warrants its enclosed smoke detector to be free from defects in materi-
als 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 au-
thority 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 post-
age 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, modifi-
cations, 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.
Figure 4. Thermistor positions:
D200-57-00 2 I56-749-05
© System Sensor 1999
The smoke detector used with this base 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.
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 photoelec-
tric 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 capability but they are somewhat better at detect-
ing fast flaming fires than slow smoldering fires. Photoelectric detectors sense smol-
dering 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
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 ex-
changes. Additionally, high air velocity environments may create increased dust con-
tamination, demanding more frequent maintenance.
To keep your equipment in excellent working order, ongoing maintenance is required
per the manufacturer’s recommendations and UL and NFPA standards. At a mini-
mum, 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 designed for long
life, they may fail at any time. Any smoke detector, fire alarm equipment, or any com-
ponent of that system which fails shall be repaired or replaced as soon as possible.
WARNING
The Limitations of Property Protection Smoke Detectors