ADEMCO 4278EX-SN Installation Instructions

No. 4278EX-SN
PASSIVE INFRARED MOTION DETECTOR
INSTALLATION INSTRUCTIONS
GENERAL INFORMATION
The No. 4278EX-SN PIR is a passive infrared motion detector for use with control
panels that support serial number polling loop devices only. It is not for use with pan-
els that support only DIP switch addressing.
The detector provides 12 zones of wide-angle coverage with a range of up to 40 feet
(12.2m) with the supplied mirror, or long range/curtain coverage (with optional long
range mirror) with a range of up to 80 feet (24.4m).
COVERAGE CONSIDERATIONS AND TYPICAL LAYOUTS
The range will depend upon the mirror system in use. Protective patterns are shown in
Diagrams 1 and 2 for a normal mounting height of 7ft (2.1m). The unit may be mount-
ed higher for increased range but mounting above 8.5 ft (2.6m) is not recom-
mended.
ÒDead ZoneÓ Caution: Note in Diagram 1 that a Òdead zoneÓ is indicated, within which
a person could be moving and not be detected by any of the unitÕs protective zones.
Other dead zones may occur between the detector and the downward fields of view as
the unitÕs mounting height is increased.
Selecting a Mounting Location
The detector responds to changes in energy which occur when an intruder moves into
or out of a protective zone. Best coverage will be obtained if the mounting site is select-
ed such that the likely direction of intruder motion is ACROSS the pattern.
Passive I.R. units are remarkably resistant to false alarm hazards, but the following rec-
ommendations should be observed:
¥ Install the detector at a height of approximately 7 feet (2.1m) from floor. Do not mount
on an unstable surface
IMPORTANT! Avoid running alarm wiring close to heavy-duty electrical power
cables .
¥ Do not install where the detector is exposed to direct sunlight or directly above strong
sources of heat.
¥ Avoid locating a unit in areas which contain objects likely to produce a rapid change
in temperature, such as central heating, radiators or ducts (or heaters of any kind),
air conditioners, open flame, etc.
¥ Make sure the detection area does not have obstructions (curtains, screens, large
pieces of furniture, plants, etc.) which may block the pattern of coverage.
INSTALLATION
A. Changing from Wide Angle to Long Range coverage:
1. Remove front cover by inserting a screwdriver blade in the groove between cover
and base at one of the locations shown in Diag. 3, rotating the blade to override
snap fit, and then lifting cover off.
2. Spread either or both plastic prongs holding the wide angle [40 ft (12.2m)] mirror
and remove the mirror (Diag. 4).
3. Insert one side of the long range [80 ft (24.4m)] mirror under a prong and snap the
other side under the other prong. Make sure that the mirror sides are squarely in
their corner rests and are held securely under the prongs.
NOTE: Mirror surface should be free of dirt, foreign matter and finger
clean dry soft cloth to wipe mirror surfaces, if required.
B. Mounting with Wall Plate
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 Diag. 5). The PIR can only be removed by
cover removal, depression of the tab from the inside with a small-blade screw
driver and then sliding the PIR upward (see Diag. 4).
C. Mounting without Wall Plate
Mount the PIR on a flat wall or in a corner, without a wall plate. Two pairs of knock-
out 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 PIRÕs 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 baseÕs mounting
tabs. In addition, the board should rest securely on the two support posts, and the
wiring entry notch at the boardÕs upper edge should rest on the long wall of the
wiring entry passage. See Diagrams 4 and 5.
N4756–8V1 11/95
TOP VIEW
SIDE VIEW
prints.
Use a
WIRING ENTRY
NOTCH (IN BOARD)
AND PASSAGE
(IN BASE)
PC BOARD
MOUNTING
TABS (2)
SERIAL NUMBER
PC BOARD
SUPPORT
POSTS (2)
PLASTIC PRONG (2)
(HOLD MIRROR
IN PLACE)
DETECTOR
DOWNWARD
APPROX. 4 FT.
(1.2m) DEAD ZONE
Diagram 1: WIDE ANGLE PROTECTION PATTERN
TOP VIEW
10' 40'
(3.0m) (12.2m)
7'
SIDE VIEW (2.1m)
2.3'
(0.7m)
Diagram 2: LONG RANGE/CURTAIN MIRROR COVERAG
(With Optional Long Range Mirror)
LIFT
2
COVER
c
1
INSERT SCREWDRIVER
AT LOCATION a, b or c
AND TWIST
a
Diagram 3: COVER REMOVAL
INSERT SMALL SCREWDRIVER
TO RELEASE WALL PLATE
NOTES:
INTERLOCKING SPRING TAB
A. Thin exterior wall in wiring entry
TERMINAL
BLOCK
B. Hole along upper edge of housing
LED
MIRROR
CORNER
RESTS (4)
MIRROR WIDE ANGLE
HORIZONTAL
ADJUSTABLE
MIRROR
CARRIER
Diagram 4: INTERIOR OF DETECTOR
Previous Menu
INTERMEDIATE
MAIN
7'6"
(2.3m)
80'
(24.4m)
80'
(24.4m)
b
area can be cut/broken away for
surface wiring.
permits use of cover securing
screw (required for VdS/SKAFOR
compliance) and holes within
wiring entry area permit addition
of wiring clamp (required by VdS).
Keep housing screw hole covered
(with label supplied or tape) if
screw not used.