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Position the front cover (see Fig. 7) in the detector housing, the
small latches aligned with their corresponding latch holders. Push
the front cover gently until a click is heard. The lens assembly,
which is located behind the front cover, is adjustable vertically.
Locking screws are provided to secure the lens assembly after
vertical adjustment and to hold the detector in the electrical box.
Opening the detector:
Using a screwdriver, release the cover by gently pushing on the
latches from the rear of the detector housing, until the front cover
disengages.
Figure 7. MR-4000 Construction
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Fig. 8 shows parts and construction of MR-4000 Lens Assembly.
Note: The Positioning Guides of model MR-4000R are slightly
different from model MR-4000 and are located on the sides of the
lens housing - see Figure 11. To change or adjust a lens, release
and remove the two lens-locking clips, located on both sides of the
lens, by pushing them from inside the cover (see Figure 9).
Install the new lens with the smooth surface outside and the lens
number held at the upper left corner, opposite the lens positioning
pointer - see figure 8. From inside the lens assembly, carefully
center the lens by sliding it to the right or left. The lens is
centered when both lens edges emerge equally above the frame
of the lens housing.
Holding firmly in place, insert the lens locking clips from the
outside (flanges pointed outward) and firmly push into place until
a click is heard - see Figures 8 and 10.
Before closing the detector, the lens assembly should be held in
the correct position relative to the detector. The positioning
guides and the pointer of the lens assembly assure correct
positioning of the lens assembly relative to the front cover. Figure
11 shows the lens housing positioning of both models: MR-4000
and MR-4000R.
Model MR-4000:
The pointer is placed
close to "A" (imprin-
ted on the inner side
of the cover).
Model MR-4000R:
The pointer is placed
close to "B". The two
guiding studs assure
correct positioning of
the lens assembly in
each model and
allow movement of
the lens assembly for
vertical adjustment.
Figure 8. Lens Assembly (MR-4000)
Figure 9. Removing Lens
Locking Clips
Figure 10. Locking the Lens
Figure 11. Positioning the Lens Housing
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A. The MR-4000 detector is much more sensitive to motion
crossing the beams of its coverage pattern than to motion
towards or away from the detector. Therefore, select the
mounting location so that the expected motion of an intruder will
cross the beams of the selected pattern.
NOTE: Passive infrared detectors are sensitive to changes in
infrared energy caused by an object moving across the unit's field of
view. The changes in infrared energy, detected by a PIR, depend
on the amount of infrared energy transmitted by the moving object.
The changes also depend on the temperature difference between
the object and the background. As a result, the PIR may fail to
respond under certain temperature and background conditions, in
which the temperature difference is too small. It is therefore
recommended that the PIR be aimed towards the coolest place in
the protected area, to obtain the maximum sensitivity in installations
where high ambient temperatures are expected.
B. Select the most convenient mounting height. An adjustment table
determines the recommended angle for any combination of range
and mounting height (see Table 1). Remember that unprotected
areas directly above and below the detector increase when the
covered area is increased.
C. Where pets are present, consider the use of lens No. 5 (Pet
Alley). For best detection performance install the MR-4000 at
the lowest possible height that enables directing of the pattern
above the level of the pets' activity.
D . MAGIC-RED is extremely immune to air turbulence and RFl
interference. However, to minimize false alarms, it is highly
recommended to avoid aiming the detector at heaters, sources
of bright light, or windows subjected to direct sunlight. Also
avoid running wiring close to high-power electrical cables.
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A. The MR-4000 is a flush mounted PIR designed to fit into
virtually any standard single-gang electrical switch box (Figure
7). The box should
be
installed per its specific instructions.
B. Due to its sealed design, the MR-4000 can also be installed
directly into a prepared space in the wall, without requiring a box
enclosure. Figure 12 provides an actual size cutout drawing
which may be used when drilling the holes in the wall.
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Use 22 AWG or larger wires. The maximum wiring length
between the unit and its power source depends on the number of
units connected in parallel and the wire gauge.
