should be positioned so that its field of view does not
cover areas outside the hazardous area. This will
minimize the possibility of false alarms caused by
activities outside the area requiring protection.
• For best performance, the detector should be
mounted on a rigid surface in a low vibration area.
• Dense fog, rain or ice can absorb IR radiation and
reduce the sensitivity of the detector.
• Although IR detectors are less affected by smoke than
other detectors, the X3300 should not be placed
where rising combustion products can obscure its
vision. If smoke is expected before fire, smoke or
other alternative detectors should be used in
conjunction with the X3300. For indoor applications, if
dense smoke is expected to accumulate at the onset
of a fire, mount the detector on a side wall at least a
few feet (approximately 1 meter) down from the
ceiling.
• If possible, fire tests should be conducted to verify
correct detector positioning and coverage.
WIRING REQUIREMENTS
WIRE SIZE AND TYPE
The system should be wired using a 14 to 22 gauge (1.3
to 0.5 mm2) cable. The wire size selected should be
based on the number of detectors connected, the
supply voltage and the cable length. See Table 2. In
some cases where the X3300 is replacing existing pulse
output detectors, the wiring and power supplies may not
be adequate. Consult the factory for assistance.
A minimum input voltage of 18 vdc must be present at
the X3300.
The use of shielded cable is required to protect against
interference caused by EMI and RFI. Consult the
factory if not using shielded cable.
The “B” (pulse output) and “D” (
oi
driver) leads from
each detector should be shielded from the “B” and “D”
leads of all other detectors in order to prevent false
alarms resulting from crosstalk between zones. It is
recommended that the “A” and “C” leads also be
shielded to provide maximum immunity to EMI/RFI.
(See Figures 6 to 10.)
In applications where the wiring cable is installed in
conduit, the conduit should not be used for wiring to
other electrical equipment.
CAUTION
Installation of the detector and wiring should be
performed only by qualified personnel.
PROTECTION AGAINST MOISTURE DAMAGE
It is important to take proper precautions during
installation to ensure that moisture will not come in
contact with the electrical connections or components
of the system. The wiring pigtail for the X3300 is factory
sealed for easy installation onto a junction box where
electrical connections are made. The integrity of the
system regarding moisture protection must be
maintained for proper operation and is the responsibility
of the installer.
If conduit is used, drains must be installed at water
collection points to automatically drain accumulated
moisture. Conduit breathers should be installed at
upper locations to provide ventilation and allow water
vapor to escape. At least one breather should be used
with each drain.
3
95-8517
Figure 1—Detector Orientation Relative to Horizon
CENTER AXIS
OF DETECTOR
FIELD OF VIEW
CENTER AXIS
OF DETECTOR
FIELD OF VIEW
INCORRECT
CORRECT
NOTE: DETECTOR MUST ALWAYS BE AIMED
DOWNWARD AT LEAST 10 TO 20 DEGREES.
B1974
Table 2—Detector Wiring Requirements
Wire Size
Minimum Voltage
Maximum Distance
AWG
at Controller
Feet
Meters
22
23 VDC
500
152
22
20.5 VDC
250
76
18
22 VDC
1000
305
18
20 VDC
500
152
16
23 VDC
2000
610
16
20.5 VDC
1000
305
14
21.5 VDC
2000
610
14
20 VDC
1000
305
