ADT490 TroubleShooting Device Failures

2 Introduction ‣ Many problems are external to FAS ‣ Many are device problems

3 Detection Circuit - Short ‣ 0 V across circuit terminals ‣ Increase in current or decrease in voltage -> Alarm 3

4 Detection Circuit - Short ‣ Smoke Detector circuits have more current to operate the Smoke Detectors ‣ Smoke Detectors must be compatible with FACP ‣ No difference to Fire Alarm Control Panel: ‣ Short through Device -> Alarm ‣ Short between devices -> False Alarm ‣ Maximum current through current limiting resistors 4

5 Detector Compatibility ‣ Sufficiently filtered ‣ Enough current to latch the circuit ‣ Below the foldback level ‣ circuit shut down ‣ device reset ‣ Tested to all FACP operating voltages ‣ Costly Test 5

6 Wire to Wire Short ‣ False Alarm - determine after dvices have been eliminated 6

7 Wire to Wire Short ‣ Supervisory latches - until panel reset 7

8 Manual Station Operation ‣ mechanically operated electrical switch ‣ spring loaded push button or toggle ‣ second is key switch ‣ must be connected to circuit ‣ increase the current 8

9 Manual Station - No Operation ‣ Improper screw connect - found during Tests ‣ wire twisted together under one screw ‣ comes loose over time 9

10 Connections - Proper & Improper 10

11 Open Identified ‣ Station tested but does not go into alarm 11

12 Open Identified ‣ Wire insulation under screw - due to haste 12

13 Device Not Connected ‣ Make connections later - never done ‣ Found during monthly or Annual test 13

14 Wire Break ‣ When cut - scored to much -> wiggles and breaks 14

15 Types of Manual Stations 15

16 Station Problems ‣ Switch out of adjustment ‣ self-wiping switch may grime up in dirty spaces ‣ too much current through switch may damage contact - check station specifications ‣ bridge contacts to test - if alarm -> replace 16

17 Station Problems ‣ corrosion on soldered lugs - check for dull cold solder 17

18 Stations 18

19 Alarm Operation ‣ First check the Stations ‣ Fire Department to find cause of alarm ‣ Reset station after advised by FD ‣ See next slide -> same voltage and current 19

20 Any Difference? 20

21 Manual Station Checklist (p. 15) 21

22 Correct Connections ‣ Wire fully engaged? 22

23 Heat Detectors 23

24 Smoke Detectors 24

25 Smoke Detectors - Damaged 25

26 Fire Detector Checklist (p. 20) 26

27 Sprinkler Flow Devices ‣ Direction? ‣ Vane or Pressure ‣ Pneumatic delay or retard up to 55 seconds ‣ Tamper connection -> should cause Trouble ‣ locating problem is easier - only one device ‣ may still require Boolean search 27

28 Sprinkler Flow Devices 28

29 Flow Switch Checklist (p. 22) 29

30 Supervisory Devices (p. 24) 30

31 Polarized Bells ‣ Contact can be carbonated - 12 to 150 mA ‣ Single stroke - on wrong circuit ‣ striker alignment? 31

32 Signal / Notification Circuits ‣ Signal circuit terminals - Alarm or Supervisory? ‣ Bell connected in reverse ‣ Circuit voltage 2 to 24 volts supervisory ‣ Current limiting fuse or breaker 32

33 Signal / Notification Circuits 33 Signal / Notification Circuits

34 Other Polarized devices ‣ Horns, Strobes, & Electronic Horns ‣ Star Strobe - up to 1.25 A 34

35 Unsupervised Aspects ‣ Placement - not interior components 35

36 Polarized Signal Checklist (p. 28) 36

37 Speakers 37

38 Speaker Checklist (p. 30) 38

39 Telephone Handsets ‣ low level signal mV ‣ Wiring often twisted & shielded ‣ hook-switch controls the supervisory current 39

40 Telephone Handsets 40

41 Telephone Handsets Circuits 41

42 Telephone Checklist (p. 32) 42

43 General Fault Checklist (p. 33) 43

44 Battery Faults 44

45 Battery & Charger Checklist (p. 34) 45

46 Power Supply Faults 46

47 Power Supply Checklist (p. 35) 47

48 End of Presentation