20 Conventional Products—6424 Projected Beam Type Smoke Detector
At the Transmitter . . .
1.
Select the proper range using the range selection switch (SW2) in the
transmitter.
Table 4: Range
Range
Distance
Short Range (S)
30 to 100 ft
Long Range (L)
100 to 330 ft
2.
If the transmitter is directly wired to the receiver (Figure 8), slide the
alignment switch (SW1) in the transmitter to the A (Align) position
and go to Step 1 in the At the Receiver. . . section of this technical
bulletin.
3.
If the transmitter is wired directly to the power supply, temporarily
wire the transmitter to the receiver (Figure 9).
4.
Make sure the alignment switch in the transmitter is in the
N (Normal) position.
Do not switch it to the A position if power to the transmitter is not
supplied through the receiver.
At the Receiver . . .
1.
Select the proper sensitivity using the switch in the back of the
receiver.
Selecting the sensitivity depends on the separation of the transmitter
and receiver. The sensitivities and ranges shown below are in
accordance with Underwriters Laboratories (UL) Standard UL 268,
Smoke Detectors For Fire Protective Signaling Systems.
Table 5: Sensitivity/Distance Qualifications
Sensitivity
Distance
30%
30 to 92 ft
30% or 55% (30% is more sensitive)
92 to 178 ft
55%
178 to 330 ft
2.
Use a small, standard screwdriver and make sure the alignment adjust
pot on the receiver is turned fully counterclockwise when looking at it
from the bottom (maximum gain, Figure 15).
The alignment adjust pot only changes the gain of the amplifier to
compensate for differences in separation between the receiver and the
transmitter; it has no effect on the sensitivity of the detector.
3.
Turn on power to the system.
Aligning the 6424
Model
