22 Conventional Products—6424 Projected Beam Type Smoke Detector
15. Shut the sliding door and return to the receiver. It is important that
three alignment LEDs are on (not four) when leaving alignment mode.
This ensures that the amplifier is not saturated with signal and will be
capable of detecting smoke within its sensitivity limits.
16. Verify that three alignment LEDs are on, and switch to normal mode
(N) at the receiver.
17. Wait at least a minute before continuing. It is important that the beam
is not blocked or disturbed during this time because the detector is
self-calibrating. Any interference could cause a trouble signal.
18. If there is a trouble signal during this period, switch the receiver back
to the align mode making sure that three and only three align LEDs
are on. If so, switch back to normal mode and wait again.
If three alignment LEDs are not on, readjust the alignment adjustment
pot.
19. When the detector has completed its self-calibration, the green normal
operation LED will flash every two to three seconds.
20. Carefully shut the sliding door.
21. Alignment is now complete.
