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D400-05-00

4

 I56-285-03

 © System Sensor 1996

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 capa-
bility 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 de-
velop 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 re-
sulting from inadequate fire protection practices, violent explosions, es-
caping 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 dilu-
tion of smoke densities created by frequent and rapid air exchanges. Addi-
tionally, 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 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.

WARNING

The Limitations of Property Protection Smoke Detectors

Maintenance

NOTE:

Before removing the detector, notify the proper au-
thorities the smoke detector system is undergoing
maintenance and, therefore, will be temporarily
out of service. Disable the zone or system undergo-
ing maintenance to prevent unwanted alarms.

1. Remove the detector cover by placing a small bladed

screwdriver in the side slot of the detector cover, twist-
ing it slightly until the cover can be turned counterclock-
wise for removal.

2. Vacuum the screen carefully without removing it. If fur-

ther cleaning is required continue with step 3, otherwise
skip to step 6.

3. See Figure 5. Remove the screen by pulling it straight

out. Vacuum the inside.

4. Clean the vaned chamber piece by vacuuming or blow-

ing out dust and particles.

5. To replace the screen, orient it so that the arrow on top

aligns with the test module socket of the detector. Care-
fully push the screen onto the base, making sure it fits
tightly to the chamber.

6. Replace the cover by gently rotating it clockwise until it

Figure 5. Removal of cover and screen for cleaning:

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 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 com-
mencing 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 Depart-

ment, 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, modifica-
tions, 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 conse-
quential 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.

locks in place.

7. Notify the proper authorities the system is back on line.

A78-1213-01

REMOVABLE HEAD COVER

CLEANABLE SCREEN

HEAD COVER
REMOVAL SLOT

VANED CHAMBER

TEST SLOT

P/N RS24 (W/O THERMAL)

Technical Manuals Online! - http://www.tech-man.com

Summary of Contents for 1412

Page 1: ...ty 10 to 93 Relative Humidity Noncondensing Electrical Ratings System Voltage 12 24 VDC Maximum Ripple Voltage 4 Volts peak to peak Start up Capacitance 0 02 uA Maximum Standby Ratings 8 5 VDC Minimum 35 VDC Maximum 100 uA Maximum Alarm Ratings 4 2 VDC Minimum at 10 mA 6 6 VDC Minimum at 100 mA Alarm current must be limited to 100 mA maximum by the control panel If used the RA400Z Remote Annunciat...

Page 2: ...inal to ensure that the connections are supervised Do NOT loop the wire under the terminals System Sensor smoke detectors are marked with a compat ibility identifier located as the last digit of a five digit code stamped on the back of the product Connect detectors only to compatible control units as indicated in System Sensor s compatibility chart which contains a current list of UL listed contro...

Page 3: ...D400R The MOD400R is used with an analog or digital voltme ter to check the detector sensitivity as described in the test module manual C Aerosol Generator Gemini 501 Set the generator to represent 4 Ft to 5 Ft obscura tion as described in the Gemini 501 manual Using the bowl shaped applicator apply aerosol until the unit alarms Notify the proper authorities that the system is back on line Detecto...

Page 4: ... 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 capa bility but they a...

Page 5: ... Reset by momentary power interruption Relay Contact Ratings Resistive or Inductive 60 power factor load Form A 2 0A 30VAC DC Form C 0 6A 110VDC 2 0A 30VDC 1 0A 125VAC 2 0A 30VAC For Canadian installations relay contact rating is 2 0A 30VAC DC Electrical Ratings 1412 1424 System Voltage 12 24 DC 4V Maximum Ripple Supply Voltages 11 3 20 VDC Minimum 17 3 29 VDC Maximum Reset Voltages 73 8 VDC Minim...

Page 6: ...e run to provide system supervision of connections For signal wiring the wiring between interconnected de tectors it is recommended that the wire be no smaller than 18 gauge Wire sizes up to 12 gauge wire may be used For best system performance the power and loop wires should be twisted pair and installed in separate grounded conduit to protect the loop from extraneous elec trical interference Smo...

Page 7: ...ny dust covers before placing system in service Testing NOTE Before testing notify the proper authorities that the smoke detector system is undergoing mainte nance and therefore will temporarily be out of ser vice Disable the zone or system undergoing maintenance to prevent unwanted alarms Before testing the detector look for the presence of the flashing LED If it does not flash power has been los...

Page 8: ...ons 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 capa bility but they are so...

Page 9: ... Operating Humidity Range 10 to 93 Relative Humidity Non condensing Maximum Air Velocity 3000 ft min 15m s Locking Alarm Reset by momentary power interruption Electrical Ratings System Voltage 12 24 VDC Maximum Ripple Voltage 4 Volts peak to peak Start up Capacitance 0 02 µF Maximum Standby Ratings 8 5 VDC Minimum 35 VDC Maximum 120 µA Maximum Alarm Ratings 4 2 VDC Minimum at 10 mA 6 6 VDC Maximum...

Page 10: ...g of 2400TH smoke detector on 3 1 2 inch and 4 inch octagonal box Figure 3 Wiring diagram for 2400 smoke detector used with two wire control panel REMOTE ANNUNCIATOR REMOTE ANNUNCIATOR CLASS A OPTIONAL WIRING NOTE IF REMOTE ANNUNCIATOR IS NOT USED POLARITY TO DETECTOR MAY BE REVERSED EOL RESISTOR INITIATING LOOP UL LISTED CONTROL PANEL 3 2 1 3 2 1 A78 1554 00 Make wire connections by stripping abo...

Page 11: ...crewdriver in the side slot of the detector cover twisting it slightly until the cover can be turned coun terclockwise for removal 2 Insert the NO ALARM end of the test card fully into the test slot See Figure 5 then slide it counterclock wise until it stops 3 The detector should not alarm after 20 seconds 4 Remove the test card by sliding it clockwise before re moving then insert the ALARM end 5 ...

Page 12: ...oke detector should be cleaned regularly per NFPA 72 or at least once a year WARNING The Limitations of Property Protection Smoke Detectors Maintenance NOTE Before removing the detector notify the proper au thorities the smoke detector system is undergoing maintenance and therefore will be temporarily out of service Disable the zone or system undergo ing maintenance to prevent unwanted alarms 1 Re...

Page 13: ...ral Description System Sensor 2400AT and 2400AIT photoelectronic smoke detectors listed to UL 268 provide open area protection and are intended for use with UL listed compatible 2 wire control panels The sensor in this detector operates on the light scattering principle and features a unique photo optic sensing chamber that optimizes smoke entry while mini mizing the effects of ambient light These...

Page 14: ...cated in System Sensor s compatibility chart This chart contains a current list of UL listed control units and detector combinations and is avail able from System Sensor upon request CAUTION Dust covers provide limited protection against airborne dust particles during shipping Dust covers MUST be re moved before the smoke detectors can sense smoke Re move sensors before beginning remodeling or hea...

Page 15: ... to represent 4 Ft to 5 Ft obscura tion as described in the aerosol generator manual Using the bowl shaped applicator apply aerosol until the unit alarms E Direct Heat Method Hair dryer of 1000 1500 watts Direct the heat toward the bimetallic collector Hold the heat source about 12 inches from the detector in order to avoid damage to the plastic When the heat rises to greater than 135 F the detect...

Page 16: ...vents 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 dilu tion of smoke densities created by frequent and rapid air exchanges Addi tionally high air velocity environments may create increased dust contamination demanding more frequent detector maintenan...

Page 17: ...umidity 10 to 95 Relative Humidity Non condensing Visual Indicator Solid State LED Locking Alarm Reset by momentary power interruption Audible Signal 85dBA minimum interrupted tone when individual unit is in alarm or when the supply voltage is reversed Electrical Ratings 2412AT 2424AT or 2424AIT Operating Voltage 12VDC 24VDC Full wave Unfiltered Full wave Unfiltered Current Standby 120 µA Max 120 ...

Page 18: ...AB EXTENSION AT SCRIBED LINE A78 1411 00 A78 534 00 Figure 1 Flush mounting of detector on 4 inch octagon box Figure 2 Detector mounting bracket system and all smoke alarms before the panel gives the required battery low signal When the battery low signal is given the battery should be capable of providing power for another 7 days after which the backup battery should have enough energy left to al...

Page 19: ... 2 Insert the NO ALARM end of the test card fully into the test slot see Figure 6 then slide it counterclockwise until it stops 4 5 4 5 SUGGESTED EOL RESISTOR UL LISTED TWO OR FOUR WIRE PANEL INITIATING LOOP Figure 4 Additional wiring needed for the isolated thermal unit of the 2424AIT detector thermal units are wired to a separate loop A78 1392 01 TEST MODULE SOCKET LED RECESSED TEST SWITCH PUSH ...

Page 20: ...ed on every level of a building Smoke detectors have sensing limitations too Ionization detectors of fer broad range fire sensing capability but they are better at detecting fast flaming fires than slow smoldering fires Photoelectronic detectors sense smoldering fires better than flaming fires Because fires develop in different ways and are often unpredictable in their growth neither type of detec...

Page 21: ...ity 3000 Ft Min 15 M S Latching Alarm Reset by momentary power interruption Electrical Ratings 2412 2424 System Voltage 12 24 DC 4V Maximum Ripple Supply Voltage 11 3 20 VDC Minimum 17 29 VDC Maximum Reset Voltage 73 8 VDC Minimum Standby Current 120 120 µA Maximum Alarm Currents 35 21 3 mA Minimum 77 40 6 mA Maximum The alarm and auxiliary relay operate within the specified voltage ratings Start ...

Page 22: ...wire under terminals Break wire run to provide system supervision of connec tions NOTE Contacts are shown in stand by mode and will transfer in alarm condition Wire connections are made by stripping about 3 8 inch of insulation from the end of the wire sliding the bare end of the wire under the clamping plate and tightening the clamping plate screw Tamper resistance Feature This detector includes ...

Page 23: ...g position of recessed test switch A78 1393 00 1 Remove the detector cover by placing a small bladed screwdriver in the side slot of the detector cover twisting slightly until the cover can be turned coun terclockwise for removal 2 Insert the NO ALARM end of the test card fully into the test slot see Figure 5 then slide it counterclock wise until it stops 3 The detector should not alarm after 20 s...

Page 24: ... 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 capa bility but they are somewhat better at detecting fast flaming fires than slow sm...

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