ADEMCO 4278EX Installation Instructions Manual page 2

B. Mounting With Wall Plate:
NOTE: For ANPI approved installations, you cannot use the mounting bracket.
1. Remove the front cover as shown in Diagram 3.
2. Mount the wall plate to a firm vertical surface (flat on wall or in a corner). See
Diagram 5 and Detail A.
3. Feed wiring through tow access hole of detector but do not connect to terminal block
yet. See Diagram 4, Note A.
4. Attach unit to wall plate by engaging all four hooks on the plate into slots on the rear
of the base and by pressing downward (see Diagram 5).
NOTE: The PIR is locked to the wall plate by a spring tab that engages a small opening
in the housing base (see Diagram 5). The PIR can only be removed by cover removal,
depression of the tab from the inside with a small-blade screwdriver and then sliding the
PIR upward (see Diagram. 4)
C. Mounting Without Wall Plate (Mandatory For VDS/ANPI Installations):
The PIR may be mounted on a flat wall or in a corner directly (without using the wall
plate). Two pairs of knockout areas are provided on the housing base, just above the
mirror, where mounting screws can penetrate the plastic. These are accessible by
removing the circuit board (spread the circuit board mounting tabs shown in Diagrams 4
and 5).
Do not open the knockout areas unless they will be used for mounting, with the heads of
the mounting screws completely covering the openings.
For flat wall mounting, a wiring passage is provided at the rear of the housing base to enable
circuit wires to be routed into the PIR's wire entry area. See Diagram 4, Note A and
Diagram 5, Detail A.
After the base is mounted, the circuit board should be carefully replaced. Align the notches
at the left and right edges of the circuit board with the base's mounting tabs and make
certain that the projections in both notchess fully engage the slots in the mounting tabs. In
addition, the board should rest securely on the two support posts, and the wiring entry notch
at the board's upper edge should rest on the long wall of the wiring entry passage. See
Diagrams 4 and 5.
D. Coverage Adjustment:
The PIR is equipped with a moveable mirror carrier which allows adjustment of the coverage
pattern in the horizontal direction after the unit is mounted (See Diagram 4). Although it
can be used in conjunction with either mirror, this feature is particularly useful when
using the Long Range/Curtain Mirror, because it can compensate for mounting on an
uneven wall, and assist in accurately aiming down long corridors through doorways, and
around obstructions. Adjustment is accomplished by depressing one of the rectangular
plastic ears at the lower left and right sides of the mirror holder. This pivots the mirror
assembly to the left or right up to 5°.
E. Ceiling Mounting:
The versatility of the PIR permits optional ceiling mounting as an alternative to the wall
mounted configurations described herein. Mounting the unit on the ceiling, using the
Long Range Curtain Mirror, can provide a 4.6m to 5.5m forward-looking "curtain" pattern
as illustrated in Diagram 6.
CEILING
CEILING
3m
3.6m
HEIGHT
FLOOR
FLOOR
DIAGRAM 6. CEILING MOUNTED UNIT
USING LONG RANGE ("CURTAIN") MIRROR
F. Inverted Mounting:
If small pets have access to the area protected by the detector, this section pertains.
The detector may be installed approximately 0.9 to 1.1m from the floor, provided
furniture or other objects do not obscure the pattern of protection.
The detector and wall plate must be mounted inverted (the PIR window at the top) with
the wall plate tilted forward (downward). Four self-adhesive rubber spacers have been
provided to aid in tilting the wall plate.
It must be noted that although this procedure adjusts the PIR zones so that small
animals will not be detected, a crawling intruder will ALSO go undetected.
1. The spacers are to be used with the wall plate only when the wide angle mirror is in
use.
Mounting flat on a wall:
Stack two spacers between the wall and each of the two mounting bosses on the rear
of the wall plate at the end opposite to the wiring entry.
Corner mounting:
Affix one of the spacers to the rear surface of each of the two corner mount tabs on the
wall plate, on the end opposite to the wire entry access cutout.
TOP
VIEW
1.2m
(at 3.6m
ceiling
height)
0
5.5m
Mount unit so that
PIR window is towards
detection area.
SIDE
VIEW
0 3m 4.6m 6m
2. Follow the "Normal Mounting" steps 2, 3 and 4 described previously, but orient the
wall plate so that the wire entry access cutout in the wall plate is positioned at the
bottom.
3. When the detector is mounted in an inverted position, those portions of the detector
mirror which normally provide downward beams of protection will now provide
beams that point upward. This will apply to both mirrors (long range and wide
angle). If possible, install the detector so that these now upward-pointing beams
are not directed at ceiling areas that include heating or air conditioning ducts and
vents or light fixtures. If these PIR sources cannot be avoided, the upward-pointing
segment of the mirror should be masked to avoid the possibility of false alarms.
See the section on "Mirror Masking" later in this document.
DOUBLE HALLWAY
TOP VIEW
DOUBLE HALLWAY AND SMALL ROOM
TOP VIEW
SMALL ROOM AND LEFT HALLWAY
TOP VIEW
SMALL ROOM AND RIGHT HALLWAY
TOP VIEW
IMPORTANT: When hallway pattern masking is used, be sure the PIR is set for
Instant Response Mode. Failure to do so results in allowing an intruder to go
undetected.
NOTE: If the hallway is less than 3m wide, the full 12m coverage will not be obtained,
but will be slightly reduced. To minimize this effect, the mirror can be aimed left or right
as described in the "Coverage Adjustment" section of this document.
WIDE ANGLE PET ALLEY (PIR Mounted at 2.1m In A 3m x 3m Room)
3.0m
TOP VIEW
0
3.0m
WIDE ANGLE PET ALLEY (PIR Mounted at 1.7m In A 4.6m x 4.6m Room)
3.0m
TOP VIEW
0
3.0m
The two mirrors included with the detector can be tailored to provide many different
coverage patterns (see examples above). This eliminates the need to purchase
additional optics.
DIAGRAM 7. PROTECTION PATTERNS WITH MASKING SEGMENTS
2
12.2m
SIDE VIEW
2.1m
3.0m 12.2m
12.2m
12.2m
SIDE VIEW
2.1m
3.0m 12.2m
12.2m
12.2m
SIDE VIEW
2.1m
3.0m 12.2m
SIDE VIEW
2.1m
12.2m
3.0m 12.2m
SIDE VIEW
2.1m
3.0m
4.6m
SIDE VIEW
1.6m
3.0m 4.6m 4.6m