7) Turn on power to the system.
8) Slide the alignment switch on the receiver to A (see
Figure 14). The yellow trouble LED should light to in-
dicate alignment mode, but the trouble relay will not
activate. If the receiver is left in the alignment mode
for more than an hour, the trouble relay will activate.
9) Point the receiver directly at the transmitter.
B) RECEIVER ALIGNMENT PROCEDURE:
1) Align the receiver by slowly moving it back and forth,
and up and down until all four LEDs light. (NOTE: If
it is impossible to get all four LEDs to light, the trans-
mitter may need to be adjusted. Go to the transmitter
and align it so that all four LEDs light, and then go
back to the receiver and continue with step 2.)
2) Adjust the alignment adjust pot until only three align-
ment LEDs are lit.
3) Further align the receiver by slowly moving it back
and forth, and up and down, trying to get all four
LEDs to light.
REPEAT STEPS 2 AND 3 UNTIL IT IS IMPOSSIBLE TO
GET MORE THAN THREE LEDs TO LIGHT. (NOTE: If
steps 2 and 3 are carefully executed, it should take
two to five tries to align the receiver.)
4) Carefully tighten the horizontal adjustment screws
first and then the two vertical adjustment screws on
the receiver bracket, making sure all three alignment
LEDs remain lit.
C) TRANSMITTER ALIGNMENT PROCEDURE:
1) Slowly move the transmitter back and forth, and up
and down, trying to get all four LEDs to light.
2) If four LEDs light, adjust the alignment adjust pot on
the receiver until only three alignment LEDs are on.
REPEAT STEPS 1 AND 2 UNTIL IT IS IMPOSSIBLE TO
GET MORE THAN THREE LEDs TO LIGHT. (NOTE: If
steps 1 and 2 are carefully executed, it should take
between two and five tries to achieve this.)
3) When it is impossible to get more than three LEDs to
light, carefully tighten the horizontal adjustment
screws and then the vertical adjustment screws on the
transmitter bracket, making sure all three alignment
LEDs stay lit.
4) Slide the alignment switch on the transmitter to the
NORMAL MODE (N) position (see figure 15) and dis-
connect any temporary wiring. Carefully close the
door on the transmitter and go to the receiver.
5) Verify that three alignment LEDs are lit and switch
back to NORMAL MODE (N) at the receiver. It is im-
portant 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 ca-
pable of detecting smoke within its sensitivity limits.
Wait at least one minute before continuing. Do not
block or disturb the beam while it is calibrating. Any
interference could cause a trouble signal. If there is a
trouble signal during this period, switch the receiver
back to ALIGN MODE to make sure that only three
LEDs are lit. Switch back to NORMAL MODE and
wait again. If three alignment LEDs are not on, repeat
the transmitter alignment procedure.
6) When the detector has completed it’s self-calibration,
the green (normal) operation LED will flash every two
or three seconds. Alignment is now complete.
Sensitivity
Total obscuration can be converted to percent per foot, as-
suming uniform smoke density for the entire length of the
beam. The chart below converts total obscuration to per-
cent per foot at both 30% and 55% sensitivity settings.
SENSITIVITY IN %/FT VS DISTANCE
ASSUMING UNIFORM SMOKE DISTRIBUTION
DISTANCE (FEET)
OBSCURA
TION (%/FT)
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
260
270
280
290
300
310
320
330
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
= 30% Sensitivity Setting
= 55% Sensitivity Setting
A78-2321-00
D400-18-00
10
I56-494-10R
