5
95-8576
3.3
Although IR detectors are less affected by smoke
•
than other detectors, the X3302 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 X3302. 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.
DETECTOR ORIENTATION
Refer to Figure 2 and ensure that the
oi
plate will be
oriented as shown when the X3302 is mounted and
sighted. This will ensure proper operation of the
oi
system and will also minimize the accumulation of
moisture and contaminants between the
oi
plate and the
viewing windows. The
oi
plate includes an arrow, which
should be pointed in the up direction, indicating that the
oi
plate and detector are correctly oriented.
IMPORTANT
The
oi
plate
must
be securely tightened to ensure
proper operation of the
oi
system (40 oz./inches
recommended).
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
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.
Conduit raceways should be inclined so that water will
flow to low points for drainage and will not collect inside
enclosures or on conduit seals. If this is not possible, install
conduit drains above the seals to prevent the collection
of water or install a drain loop below the detector with a
conduit drain at the lowest point of the loop.
Conduit seals are not required for compliance with
explosion-proof installation requirements, but are highly
recommended to prevent water ingress in outdoor
applications. Units with M25 thread must use an IP66
washer to prevent water ingress.
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
Figure 1—Detector Orientation Relative to Horizon
Figure 2—Front View of the X3302
VIEWING WINDOW (3)
oi
PLATE
DETECTOR
STATUS INDICATOR
E2068
PLACE MAGNET
HERE TO INITIATE
MAGNETIC
oi
oi
MAGNET
