NOTICE!

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 connec- tor pins, the center pin is positive (+) with respect to either outside pin (outside pins are common (-)).

CAUTION!

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

Use of the sounder is intended only as an aid for walk testing during installation.

3. Place the cover on the unit, and twist-lock it clockwise into place.

NOTICE!

Be sure the TC6000 and Sonalert leads are dressed through the cut- out.

4.Apply power to the unit.

5.Wait at least two minutes, after applying power, to start walk tests.

NOTICE!

Walk testing should be done across the coverage pattern as shown.

REAR WIRE

TERMINAL

ENTRANCE

STRIP

 

1

WIRE

8

TIE-DOWNS (2)

 

MOUNTING

INTERFACE

SLOTS (4)

PINS

Mounting Base

Figure 2.3: Overview

ANTI-T AMPER SCREW HOLE

REQUIRED FOR EN50131

INST ALLA TIONS

 

TEST LEAD SOUNDER

ALARM/TEST LED

 

INDICATOR (3)

 

CUTOUT

 

 

NOISE

 

 

VOLTAGE

 

 

LO

 

 

HI

 

 

ON

 

 

OFF

 

GAIN SELECT

 

JUMPER

 

LO

 

COVER

 

 

HI

CONFIGURATION

TAMPER

 

 

SWITCHES

 

 

ANTI-TAMPER SCREW HOLE

 

 

REQUIRED FOR EN50131

 

 

INSTALLATIONS

 

 

Top View of Enclosure

 

with Cover and Optical Module Removed

6.The edge of the coverage pattern is determined when the Alarm/Test LED indicator (and optional Sonalert®, if installed) first turns on.

7.Walk test the unit from all directions to determine the boundaries.

8.After completion of the walk tests, remove the Sonalert® (if installed).

6 Final Tests

6.1 Noise Measurement

NOTICE!

Meter readings are very important in determining background distur- bance levels and catch margin sensitivity.

1.Connect a 20,000 ohm/volt (or greater) DC VOM to the Noise Voltage connector using the TC6000 as shown. Set meter scale for about 3.0 VDC.

2.The base reference level for reading background noise or target volt- ages is approximately 2.0 VDC. Installations in quiet environments, therefore, will result in a steady meter reading between 1.9 and 2.1 VDC. Look for areas and sources of thermal disturbances if the meter fluctuates greatly.

4.Firmly mount the base. Depending on local regulations, the base may be directly surface mounted using anchors, mollies, or wing-nuts, or may be mounted to standard 4-inch octagonal or square electrical boxes.

NOTICE!

The DS938Z base will not completely cover a 4-inch square box. Where aesthetics are important, a 4-inch octagonal box is recommended.

NOTICE!

Mounting to removable ceiling tiles is not recommended unless a sandwich is made of the base, ceiling tile, and a back plate behind the tile. Covers used for 4-inch octagonal and square boxes make a suitable back plate (when used with bolts and wing nuts, as an example).

3 Wiring

CAUTION!

Only apply power after all connections have been made and inspected. Do not coil excess wiring inside detector. Use no smaller than #22 AWG (0.8 mm) wire in the terminal strip.

8 © 2012 Bosch Security Systems, Inc.

F.01U.263.663 01 05.2012 5

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Bosch Appliances DS938Z manual Final Tests Noise Measurement, Wiring

DS938Z specifications

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