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 of infrared energy; all objects transmit infrared energy. The warmer an 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.

2.0 Specifications

• Coverage:

• 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).

• Sonalert

Connector: 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/

CIRCUIT BOARD RETAINER TAB (2)

COVER TAMPER SWITCH

TAMPER RELAY

TO REPLACE OPTICAL MODULE,

4 5 6 7 8

TERMINAL

STRIP

LIFT THIS EDGE UP

SETUP SWITCH BANK

(UNDER MIRROR ASSEMBLY)

REPLACEABLE

OPTICAL MODULE

SONALERT™ CONNECTOR

(UNDER MIRROR ASSEMBLY)

RELFECTING MIRROR

WALK TEST/ALARM

LED INDICATOR

BACKGROUND NOISE

VOLTAGE CONN ECTOR

PERMANENT

Front view with cover off

SURFACE WIRE

REAR WIRE ENTRANCE

ENTRANCE

BRACKET WIRE ENTRANCE

REAR WIRE ENTRANCE

SURFACE MOUNT

HOLES (4)

CORNER MOUNT

HOLES (4)

The DS794Z is shipped with the OA80 80 foot (24.4 m) Mirror installed. 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.

Standard Range:

Broad (OA80 Mirror): 80 ft. by 50 ft. (24.4 m by 15.3 m) Long (OA200 Mirror): 200 ft. by 10 ft. (61.0 m by 3.1 m)

Optional Range:

Long (OA120 Mirror): 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.

TAMPER SCREW

HOLE

TEST/SOUNDER

CORD SLOT

COVER TABS (4)

Base

• Options: OA120-2* Mirror and TC6000 Test Cord.

* Shipped in packages of 2.

3.0 Mounting

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.

• Remove the cover by inserting a thin screwdriver into each of the four slots on the cover. Twist gently until the cover snaps free of the tabs on the base.

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.

B334 COVER

NOTCH

CURVED WASHER

HEX NUT

DS794Z BASE

WASHER EARS OUT

NOTCHED SIDE DOWN

THREADED STUD

B334 BODY

Lock Washer

Bracket to Base Assembly

To insure proper catch performance, a bracket mounted detector permits the flexibility needed to properly adjust the direction of the coverage pattern.

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.

• 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.

• Return the circuit board to its base. Slide the back of the circuit board under the tabs at the back of the base, 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.

WIRE ENTRANCE

STUD HOLE FOR

CEILING MOUNTED

BRACKET

STUD HOLE (HIDDEN) FOR WALL MOUNTED

BRACKET

MOUNTING

HOLES (4)

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: Be sure all wiring is unpowered (de-energized) before routing.

• Return the circuit board to its base. Slide the back of the circuit board under the tabs at the back of the base, then snap the front into place.

4.0 Wiring

• 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).

• Mount the B334 to a standard single-gang switch or outlet box using

NOTE: Do not coil excess wiring inside unit.

ONLY APPLY POWER AFTER ALL CONNECTIONS HAVE BEEN MADE AND INSPECTED.

the supplied Bevel Head screws. (If surface mounting the unit, use the wall screw/anchor assemblies or appropriate alternatives).

Locate the two-piece terminal strip on the side of the circuit board assembly. Remove the wiring connector from the terminal strip by

• 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 B334 bracket. Use the bottom hole for wall mounting or the front hole for ceiling mounting. Make sure the hex head is seated in place.

• Complete the assembly by securing the detector base to the B334 bracket using the supplied curved washer and hex nut (see drawing).

• Hand tighten the hex nut.

inserting a screwdriver between the wiring connector and terminal strip, and gently prying apart.

• Terminals 1 (-) & 2 (+): Power limits are 6 to 15 VDC. Use no smaller 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. Shorts to ground (-) when the detector is in a Trouble condition.

Re-install the wiring connector to the terminal strip.

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