Bosch DS794Z User manual

Installation Instructions
DS794Z Long Range Passive Infrared
Intrusion Detector with Self-test
Trademark names are used throughout this document. In most cases,
these designations are claimed as trademarks or registered trademarks in
one or more countries by their respective owners. Rather than placing a
trademark symbol in every occurrence of a trademark name, Bosch
Security Systems, Inc. (hereinafter referred to as Bosch) uses the
names only in an editorial fashion and to the benefit of the trademark
owner with no intention of infringing the trademark.
1.0 General Description
The DS794Z is a high performance intrusion detector designed to
provide an alarm condition upon the detection of an intruder moving
into or through its coverage pattern.
Technology designed into the DS794Z is based on the transmission
ofinfraredenergy;allobjectstransmitinfraredenergy.Thewarmeran
object is, the more infrared energy transmitted. The DS794Z detects
the change in infrared energy that occurs when a target passes
through its view.
The coverage pattern, consisting of sensor fingers (to detect the
target) is arranged in a side-by-side array. The total number of fingers
is determined by the optical module used. The fingers are grouped
by polarity into pairs, with each pair consisting of one zone.
To detect motion, the DS794Z must first see a change in infrared
energy in one finger followed by a change of energy in the remaining
finger. Therefore, disturbances that occur in only one finger do not
constitute motion and are ignored.
The “catch sensitivity” may be changed by the installer to provide a
degree of sensitivity determined by each installation.
2.0Specifications
•Coverage:
TheDS794ZisshippedwiththeOA8080foot(24.4m)Mirrorinstalled.
If a 200 foot (61 m) range is desired, it will be necessary to install the
OA200 Mirror that is sent along with the unit.
StandardRange:
Broad(OA80Mirror): 80 ft. by 50 ft. (24.4 m by 15.3 m)
Long(OA200Mirror): 200 ft. by 10 ft. (61.0 m by 3.1 m)
OptionalRange:
Long(OA120Mirror): 120 ft. by 25 ft. (36.6 m by 7.6 m)
•Input Power: 6.0 to 15.0 VDC; 18 mA at 12 VDC.
•Standby Power: There is no internal standby battery. Connect to
DC power sources capable of supplying standby power if primary
power fails. Eighteen mA-H required for each hour of standby time
needed. Four hours (72 mA-H minimum) are required for UL Listed
Requirements.
•Sensitivity: Field selectable for Standard, Intermediate, or High.
•Alarm Relay: Silent operating Form “C” relay. Contacts rated 125
mA, 28 VDC maximum for DC resistive loads. Do not use with
capacitive or inductive loads.
•Tamper: Normally Closed (with cover in place) tamper switch.
Contacts rated at 28 VDC, 125 mA maximum.
•Trouble Output: A solid state open collector shorts to ground (-)
when the detector is in a trouble condition. Maximum current load
is 25 mA.
•Temperature: The storage and operating range is -20° to +120°F
(-29° to +49°C). For UL Listed Requirements, the range is +32° to
+120°F (0° to +49°C).
•SonalertConnector: Using a Sonalert type sounder (low voltage)
will provide an audible tone when the unit is in alarm. A sounder is
intended only as an aid for walk testing during installation.
• Reading Bosch Security Systems, Inc. Product Date Codes
For Product Date Code information, refer to the Bosch Security
Systems, Inc. Web site at: http://www.boschsecurity.com/datecodes/
Front view with cover off
TERMINAL
STRIP SETUP SWITCH BANK
(UNDER MIRROR ASSEMBLY) SONALERT™ CONNECTOR
(UNDER MIRROR ASSEMBLY)
COVER TAMPER SWITCH
CIRCUIT BOARD RETAINER TAB (2)
WALK TEST/ALARM
LED INDICATOR
8
7
6
5
4
REPLACEABLE
OPTICAL MODULE PERMANENT
RELFECTING MIRROR
BACKGROUND NOISE
VOLTAGE CONNECTOR
TAMPER RELAY
TO REPLACE OPTICAL MODULE,
LIFT THIS EDGE UP
REAR WIRE
ENTRANCE
REAR WIRE
ENTRANCE
SURFACE WIRE
ENTRANCE
BRACKET WIRE ENTRANCE
CORNER MOUNT
HOLES (4)
SURFACE MOUNT
HOLES (4)
COVER TABS (4)
TAMPER SCREW
HOLE TEST/SOUNDER
CORD SLOT
Base
•Options: OA120-2* Mirror and TC6000 Test Cord.
* Shipped in packages of 2.
3.0Mounting
Select a location likely to intercept an intruder moving across the
coverage pattern (review patterns on page 4). The recommended
mounting height is 7.5 ft. (2.3 m) for the DS794Z with the OA80 or
OA120 Mirror, or 10 ft. (3.1 m) for the OA200 Mirror. Each mounting
surface should be solid and vibration free. When mounting, avoid hot
and cold drafts, heat sources, animals and pets and direct sunlight.
Do not mount outdoors.
• Removethecoverbyinsertingathinscrewdriverintoeachofthefour
slots on the cover. Twist gently until the cover snaps free of the tabs
on the base.

Page 2 © 2011 Bosch Security Systems, Inc. DS794Z Installation Instructions
3.1 Bracket Mounting
NOTE: The use of the B334 Mounting Bracket (included) is strongly
recommended when installing this detector.
Because variations exist in the surfaces of most mounting walls, most
units are not mounted at perfect angles to the floor or walls. This may
cause the pattern to point away from the “ideal” direction.
For example: A shift of only 1 degree will cause a pattern shift of
1.7 ft. (0.52 m) at 100 ft. (30.5 m). Under worst case conditions, this
will cause the pattern to be aimed over the head of intruders at
maximum range, or into walls of narrow corridors. What may seem to
be poor range or catch performance, may be the result of improper
alignment.
THREADED STUD
DS794Z BASE
B334 BODY
B334 COVER
NOTCH
WASHER EARS OUT
NOTCHED SIDE DOWN
CURVED WASHER
HEX NUT
Bracket to Base Assembly
Lock Washer
To insure proper catch performance, a bracket
mounted detector permits the flexibility needed to
properlyadjustthedirectionofthecoveragepattern.
If Mounting to the B334 Mounting Bracket:
• Remove the cover of the bracket by inserting a thin screwdriver into
the notch on the side of the bracket and twisting gently.
• Insert the alarm and power wiring through the center hole from the
rear of the B334 base. (Do not insert wiring if the bracket is to be
surface mounted).
• MounttheB334 to a standard single-gang switchoroutletboxusing
the supplied Bevel Head screws. (If surface mounting the unit, use
the wall screw/anchor assemblies or appropriate alternatives).
• Remove the circuit board from its base. Press the two circuit board
retainer tabs outward and lift the circuit board away from the base.
• Remove the sticker covering the entrance from the back of the
detector base.
• Insert the threaded stud through the appropriate stud hole in the
B334bracket.Usethebottomholeforwallmountingorthefronthole
for ceiling mounting. Make sure the hex head is seated in place.
• Complete the assembly by securing the detector base to the B334
bracketusingthesuppliedcurvedwasherandhexnut(seedrawing).
• Hand tighten the hex nut.
• Thread the bracket wiring through the stud and along the wiring
channel in the detector’s base to the area of the circuit board’s
terminal strip.
• Returnthe circuitboardto itsbase.Slide thebackof thecircuitboard
underthetabsatthebackofthebase,then snap the front into place.
• Aim the detector in the desired general direction and tighten the hex
nut using the supplied hex wrench.
• Should the detector require realignment, loosen the hex nut,
reposition the detector, and then retighten the nut.
MOUNTING
HOLES (4)
WIRE ENTRANCE
STUD HOLE FOR
CEILING MOUNTED
BRACKET
STUD HOLE (HIDDEN)
FOR WALL MOUNTED
BRACKET
B334 Bracket
3.2 Surface or Corner Mounting
• Remove the circuit board from its base. Press the two circuit board
retainer tabs outward and lift the circuit board away from the base.
• Select and break away the appropriate thin-wall wire entrance
covering the detector base.
• Using the base as a template, mark the location of the mounting
holes on the mounting surface. Pre-start the mounting screws.
• Route the wiring to the rear of the base and through the wire
entrance. Firmly mount the base to the mounting surface.
NOTE: Besureallwiringisunpowered(de-energized) beforerouting.
• Returnthe circuitboardto itsbase.Slide thebackof thecircuitboard
underthetabsatthebackofthebase,then snap the front into place.
4.0 Wiring
ONLY APPLY POWER AFTER ALL CONNECTIONS
HAVE BEEN MADE AND INSPECTED.
NOTE: Do not coil excess wiring inside unit.
Locate the two-piece terminal strip on the side of the circuit board
assembly. Remove the wiring connector from the terminal strip by
inserting a screwdriver between the wiring connector and terminal
strip, and gently prying apart.
•Terminals1(-)&2(+): Powerlimitsare6to15VDC.Usenosmaller
than #22 AWG (0.8 mm) wire pair between the unit and the power
source.
•Terminals 3, 4, & 5: Alarm relay contacts rated 125 mA, 28 VDC
maximum for DC resistive loads. Use terminals 4 & 5 for Normally
Closed circuits. Do not use with capacitive or inductive loads.
•Terminals 6 & 7: Tamper contacts rated at 28 VDC, 125 mA.
•Terminal 8: Trouble. Solid State Trouble output.Shortstoground
(-) when the detector is in a Trouble condition.
Re-install the wiring connector to the terminal strip.

DS794Z Installation Instructions © 2011 Bosch Security Systems, Inc. Page 3
5.0 Configuration Switch Settings
The DS794Z has several features that are controlled using the
configuration switches.
CONFIGURATION
SWITCHES ON
OFF
1 ON = LED ON
1 OFF = LED OFF
2 ON and 3 ON = Standard Sensitivity
2 OFF and 3 ON = Intermediate Sensitivity
2 ON and 3 OFF = High Sensitivity
4 ON and 5 OFF = 4 Day Motion Monitor
4 OFF and 5 ON = 30 Day Motion Monitor
4 OFF and 5 OFF = Motion Monitor Off
1 2 3 54
5.1LED Operation (S1)
•ON: Allows the Alarm/Test LED to operate when activated by
motion.
•OFF: TheLEDwillnotoperateonalarmactivation,butwill indicate
a supervision trouble condition.
5.2 Sensitivity Mode (S2 and S3)
Sensitivity modes depend on the type of coverage desired and the
installation environment.
•Standard Sensitivity: The recommended setting for the DS794Z
with the 80 ft. (24.4 m) Mirror installed. Tolerates environment
extremes on this setting. Not recommended for the 120 ft. (36.6 m)
and 200 ft. (61 m) coverages.
•Intermediate Sensitivity: The recommended setting for the 120 ft.
and 200 ft. (36.6 m and 61 m) coverages or for locations where an
intruder is expected to cover only a small portion of the protected
area. Tolerates normal environments on this setting.
•High Sensitivity: The setting for fast response to intruder signals.
For use in quiet environments where thermal and illumination
transients are not anticipated.
If both switches are in the Off position, the unit will default to the
Intermediate setting.
NOTE: Although the sensitivity modes provide different degrees of
tolerance to environmentally caused alarms, the installer
should assure peak background noise voltage readings do
not exceed ±0.15 VDC. (See Section 8.0 Final Tests).
5.3 Motion Monitor (S4 and S5)
Set switches S4 and S5 for the desired Motion Monitor time (see
Supervision Features). The detector is shipped with the Motion
Monitor feature Off.
6.0 Supervision Features
The DS794Z performs several supervision features that, combined
with the advanced motion detection capabilities of the detector,
provide an extremely high level of security. A supervision trouble
condition is indicated at the detector by the Alarm/Test LED (see the
Supervision Display Chart).
• The LED indicates the cause of the supervision trouble once per
secondusingcodedpulses.Thesupervisiontroublesignalactivates
the Trouble Output available on terminal 8.
The supervision features function as follows:
•PIR: TheoperationofthePIRiselectronicallycheckedapproximately
every 12 hours. If the PIR fails, the Alarm/Test LED will flash 4 times
and the Trouble Output will activate.
•MotionMonitor Supervision: Thisfeatureverifiesthatthe detector
hasa clearviewofthedetection area.Whenselected usingswitches
S4 and S5, a supervision timer is activated. A trouble condition will
be indicated if the detector has not alarmed at least once during the
selected time period (this feature can be disabled by placing both
switches in the Off position). The time period selected should be
long enough to allow adequate time for holiday weekends.
Refer to Section 5.0 (Configuration Switch Settings) for proper
switch settings.
If the time period selected has elapsed from the last alarm, the LED
will flash 2 times and the Trouble Output will activate.
It is recommended that the 30 day timer be selected. This verifies
that the unit is operational and avoids nuisance trouble conditions
caused by holidays, vacations, etc.
LED
ON
Flashing 2
Flashing 4
CAUSE
Unit Alarm
Motion Monitor Timeout
PIR Self-test Failure
Supervision Display Chart
7.0 Setup and Walk Testing
If a different optical module is to be used:
• Slidethe current module freefrom its housing. Install thenew optical
module onto the housing. Make sure it snaps into place.
NOTE: Excessive handling of the front mirrored surfaces may lead
to performance degradation.
• Replace the front cover.
NOTE: All testing must be performed with the front cover in place.
• Apply power to the unit.
•Wait at least two minutes, after applying power, to start walk tests.
For best results, wait at least 1 minute between walk tests to allow
the processing to adjust to the background.
NOTE: Walk testing should be done across the coverage pattern as
shown.
• TheedgeofthecoveragepatternisdeterminedwhentheAlarm/Test
LED indicator (and optional Sonalert, if installed) first turns on.
NOTE: The use of a Sonalert type device (sounder) will provide an
audible tone during the time the unit is in alarm. Of the three
available connector pins, the center pin is positive (+) with
respect to either outside pin (outside pins are common (-)).
Walk test the unit from all directions to determine the boundaries.
• After completion of the walk tests, remove the Sonalert (if installed).

3/11
DS794Z Installation Instructions
P/N: F01U068930-06 Page 4
© 2011 Bosch Security Systems, Inc.
130 Perinton Parkway, Fairport, New York 14450
www.boschsecurity.com
8.0 Final Tests
NOTE: Meterreadingsareveryimportantindeterminingbackground
disturbance levels and catch margin sensitivity.
• Connecta20,000ohm/volt(orgreater)DCVOMtotheNoiseVoltage
connector pins as shown. Set meter scale for about 3 VDC. Route
meter wiring through the slot in the base. (Use of the TC6000 is
recommended, but is not essential for meter use.)
• The base reference level for reading background noise or target
voltages is approximately 2.0 VDC. Installations in quiet
environments, therefore, will result in a steady meter reading
between 1.9 and 2.1 VDC.
Voltagechangesgreaterthan0.75VDC fromthereferencelevelare
desirable for good catch performance. If changes are less than
±0.75 VDC, the device may fail to respond at this distance if the
temperature difference between the intruder and the background is
very small.
• Turn on all heating and cooling sources that would normally be in
operation during times of protection. Stand away from the unit and
outside the coverage pattern, then monitor the background noise
for at least three minutes.
DS794Z readings should not deviate from the reference level more
than ±0.15 VDC. For readings outside these limits; eliminate the
cause, re-point the unit slightly, or mask off the affected zones.
9.0 Other Information
9.1LEDIndicatorOperation
• If viewing the operation of the Alarm/Test LED indicator is not
desiredaftersetupandwalktestsarecompleted,placeconfiguration
switch S1 in the Off position.
9.2 Sealing the Wire Entrance
• The foam plug that is provided with the unit is for sealing the wire
entrance from drafts and insects.
9.3 Maintenance
• At least once a year, the range and coverage should be checked
according to Sections 7.0 and 8.0 (Walk Testing and Final Tests).
• To ensure continued daily operation, the end user should be
instructed to daily walk through the far end of the coverage pattern.
This assures an alarm output prior to arming the system.
9.4 Mirror Module Information
• Shouldthemirror surfaces become soiled or dirty, clean usingasoft
clean cloth and any commonly available mild window cleaner.
9.5 Masking
• Refer to the mirror module and pattern drawings for masking
information.
• Before attempting any masking, be sure the chosen mirror surface
is the correct one. When attempting to remove any masking, many
adhesives will either destroy the mirror’s surface or leave enough
residue behind to reduce coverage performance.
• Shaded areas of the mirror drawings do not affect the pattern and,
therefore, are not maskable.
10.0 Coverage Patterns
Mirror to Pattern
Reference
OA80
A
BCDE
H
G
FIJ
K
20
20
0 METERS 36
TOP VIEW
0
10
10
0 FEET 120
0 FEET 120
7.5
10
SIDE VIEW
D-FG,H
I
0
0 METERS 36
A-C
C
A
B
G
HF
D
E
I
OA120 Mirror Coverage OA120
A
BC
D
F
GH
E
I
Mirror to Pattern
Reference
0
50 METERS 61
TOP VIEW
5
SIDE VIEW
0 FEET 200
0 FEET 200
0
10
200
61
0 METERS
OA200 Mirror Coverage
OA200
E
D
C
B
A
Mirror to Pattern
Reference
SIDE VIEW
0 FEET 80
0
10
KI, J F - H
0 METERS 24
A - E
OA80 Mirror Coverage
TOP VIEW
0 METERS 24
0
10
20
30
30
20
10
A
B
C
D
0 FEET 80
F
E
H
G
K
J
I