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Recommended Detector Maintenance Procedure

NOTE:

  Notify  the  proper  authorities  that  the  smoke  detector 

system is undergoing maintenance, and therefore the system will 
temporarily  be  out  of  service.  Disable  the  zone  or  system  un-
dergoing maintenance to prevent unwanted alarms and possible 
dispatch of the fire department.
1.  Turn off power to the system.
2.  Remove and inspect sampling tube filters.
3.   If  filters  are  heavily  coated  with  dirt,  replace  them  with  new 

filters. If they are not heavily coated, use a vacuum cleaner or 
compressed air nozzle to remove dust, then reinstall the filters.

4.  Remove detector from housing (See Figure 8).

TESTING

Before  testing,  notify  the  proper  authorities  that  the  system  is 
undergoing maintenance, and will temporarily be out of service. 
Disable the system to prevent unwanted alarms.
All  sensors  must  be  tested  after  installation  and  periodically 
thereafter.  Testing  methods  must  satisfy  the  Authority  Having 
Jurisdiction  (AHJ).  Sensors  offer  maximum  performance  when 
tested and maintained in compliance with NFPA 72. The sensor 
can be tested in the following ways:

A. Functional: Magnet Test (P/N M02-04-00 or M02-09-00) 

 This sensor can be functionally tested with a test magnet. The test 
magnet electronically simulates smoke in the sensing chamber, test-
ing the sensor electronics and connections to the control panel.
1.  Hold  the  test  magnet  in  the  magnet  test  area  as  shown  in  

Figure 7.

2. The sensor should alarm the panel.
 Two LEDs on the sensor are controlled by the panel to indicate 
sensor  status.  Coded  signals,  transmitted  from  the  panel,  can 
cause the LEDs to blink, latch on, or latch off. Refer to the control 
panel  technical  documentation  for  sensor  LED  status  operation 
and expected delay to alarm.

B. Smoke Entry: Aerosol Generator (Gemini 501) 

 The Gemini model 501 aerosol generator can be used for smoke 
entry testing. Set the generator to represent 4%/ft. to 5%/ft. ob-
scuration as described in the Gemini 501 manual. Using the bowl 
shaped applicator, apply aerosol until the panel alarms.
A  sensor  that  fails  any  of  these  tests  should  be  cleaned  as  de-
scribed  under  CLEANING,  and  retested.  If  the  sensor  fails  after 
cleaning, it must be replaced and returned for repair.
When testing is complete, restore the system to normal opera-
tion  and  notify  the  proper  authorities  that  the  system  is  back 
in operation.

SS-400-000 

I56-3065-000R

CLEANING

It is recommended that the detector be removed from its mount-
ing base to facilitate cleaning. The detector is cleaned as follows:

NOTE:

 Before removing the detector, notify the proper authorities 

that  the  smoke  detector  system  is  undergoing  maintenance  and 
will  be  temporarily  out  of  service.  Disable  the  zone  or  system 
undergoing maintenance to prevent unwanted alarms.
1.   Remove the detector cover by prying away the four side tabs 

with a small-bladed screwdriver, and then pulling the cover 
from the base.

2.   Vacuum the screen carefully without removing it. If further clean-

ing is required continue with Step 3, otherwise skip to Step 7.

3.   Remove  the  screen  assembly/chamber  cover  by  pulling  it 

straight out (see Figure 10).

4.   Clean the chamber by vacuuming or blowing out dust and particles.
5.   Replace the sensing chamber cover, aligning the arrow on the 

top with arrow on the printed circuit board.

6.   To  replace  the  screen,  place  it  over  the  chamber  assembly, 

turning it until it snaps into place.

7.   Replace the cover using the LEDs to align the cover and then 

gently pushing it until it locks into place.

8.  Reinstall the detector.
9.  Test the detector as described in TESTING.
10.  Reconnect disabled circuits.
11.   Notify the proper authorities that the system is back on line.

LASER SAFETY INFORMATION

This  smoke  detector  does  not  produce  any  hazardous  laser  ra-
diation and is certified as a Class 1 laser product under the U.S. 
Department  of  Health  and  Human  Services  (DHHS)  Radiation 
Performance  Standard  according  to  the  Radiation  Control  for 
Health and Safety Act of 1968.
Any  radiation  emitted  inside  the  smoke  detector  is  completely 
within the protective housings and external covers. The laser beam 
cannot escape from the detector during any phase of operation.
The  Center  of  Devices  and  Radiological  Health  (CDRH)  of  the 
U.S. Food and Drug Administration implemented regulations for 
laser products on August 2, 1976. These regulations apply to laser 
products manufactured after August 1, 1976. Compliance is man-
datory for products marketed in the United States.

Accessories 

 

 

Part No.

Remote LED 

 

 

RA400ZA

Remote Test Station 

 

RTS451/RTS451KEY

Piezo Alert Sounder 

 

PA400

Replacement Filters 

 

F36-05-00

Magnet   

 

 

M02-04-00

End Plug For Sampling Tube 

P48-21-00

Installation Kit (Parts bag)   

A2650-01

Three-Year Limited Warranty

System  Sensor  warrants  its  enclosed  product  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  the  enclosed  product.  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 replacement of any part of 

the  product  which  is  found  to  be  defective  in  materials  or  workman-

ship  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, Returns 

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    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  limita-

tion  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.

Please refer to insert for the Limitations of Fire Alarm Systems

firealarmresources.com

Summary of Contents for 7251DH

Page 1: ...Station Specifications Length 14 5 inches 36 7 cm Width 5 inches 12 7 cm Depth 3 5 inches 8 9 cm Weight 2 8 lbs 1 1 kg Operating Temperature Range 32 to 100 F 0 to 38 C Operating Humidity Range 10 to 93 Relative Humidity Duct Air Velocity 300 4000 ft min Voltage Range 15 32 VDC Peak Standby Current nominal 230uA at 24 VDC no communication 330uA at 24 VDC one communication every 5 sec with LED enab...

Page 2: ...uct Air Flow Direction and Velocity The 7251DH is designed to be used in air handling systems having air velocities of 300 to 4000 feet per minute Be sure to check en gineering specifications to ensure that the air velocity in the duct falls within these parameters If necessary an Alnor Model 6000 P velocity meter Dwyer 460 differential pressure gauge or their equivalent may be used to check the a...

Page 3: ... Figure 3B Installation of foam gaskets over sam pling tube bushings B Installation for Ducts More Than 8 Feet Wide NOTE To install inlet tubes in ducts more than 8 feet wide work must be performed inside the air duct Sampling of air in ducts wider than 8 feet is accomplished by using the ST 10 inlet sam pling tube Install the inlet tube as follows 1 Any tube over 3 feet long that doesn t protrude...

Page 4: ... EXHAUST TUBE AIR FLOW DIRECTION EXHAUST TUBE INLET TUBE INLET TUBE EXHAUST TUBE DETECTOR HOUSING AIR FLOW DIRECTION EXHAUST TUBE INLET TUBE DETECTOR HOUSING A B C D HORIZONTAL MOUNTING OF HOUSING VERTICAL MOUNTING OF HOUSING Figure 5 Tube mounting configurations with varying air flow direction and orientation of detector housing Vertical as well as horizontal mounting is acceptable H0109 00 the a...

Page 5: ...all the RTS451 RTS451KEY test coil connect the device as shown in Figure 11 wire runs must be limited to 25 ohms or less per interconnecting wire Place the coil in the detector housing with the arrow facing up and pointing toward the detector as in Figure 11 Attach the coil leads to the housing terminals as shown polarity is not important Firmly screw the bracket in place over the test coil 8 4 Tr...

Page 6: ...ine Comm Line Alarm Initiation Loop Comm Line ULC Listed Control Panel 1st Detector in Loop 2nd Detector in Loop The RTS451 RTS451KEY test coil circuit requires an external 24VDC power supply which must be UL listed Figure 9C System wiring diagram for duct detectors using a ULC listed control panel Figure 9A Figure 9B H0542 00 DETECTOR HEAD TEST COIL H0292 00 Figure 11 RTS451 RTS451KEY test coil i...

Page 7: ...y vacuuming or blowing out dust and particles 5 Replace the sensing chamber cover aligning the arrow on the top with arrow on the printed circuit board 6 To replace the screen place it over the chamber assembly turning it until it snaps into place 7 Replace the cover using the LEDs to align the cover and then gently pushing it until it locks into place 8 Reinstall the detector 9 Test the detector ...

Page 8: ...T LOG Detector Identification Information Manufacturer Detector Model Serial Number Date Installed Description of Detector Location The Results and Maintenance Data Date Tested Test Description Test Results Maintenance Performed Comments firealarmresources com ...

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