Bosch Appliances Home Security System DS938Z Manuel D’Utilisation

4  © 2012 Bosch Security Systems, Inc.

Figure 2.1: Coverage Pattern 

Optical module

Interface connector

Cover twist tabs (4)

Test lead
cutout

Enclosure release openings (2)

Anti-vandal 
locking screw
holes (2)

Interface
pins

Enclosure release tabs

Figure 2.2: Opening cover

Slightly rock the enclosure side-to-side during removal to overcome the 

friction caused by the base-to-enclosure terminal pins.

1.  Remove the base from the enclosure by pressing the two enclosure re-

lease tabs inward while lifting the enclosure away from the base. Refer 

to Figure 2.2.

9 m
8 m

6 m

4 m

2 m

0 m

2 m

4 m

6 m

8 m
9 m

30 ft

26 ft

20 ft

13 ft

7 ft

0 ft

7 ft

13 ft

20 ft

26 ft

30 ft

30 ft

26 ft

20 ft

13 ft

7 ft

0 ft

7 ft

13 ft

20 ft

26 ft

30 ft

≤5.5 m

≥4.0 m

4.6 m

0 m

≤4.0 m

3.0 m

≥2.4 m

0 m

9 m

8  m

6  m

4  m

2  m

0  m

2  m

4  m

6  m

8  m

9 m

0 ft

≥8 ft

10 ft

≤13 ft

0 ft

≥13 ft

15 ft

≤18 ft

AR13-18

AR8-13

2.  Open the cover by turning counterclockwise. 
3.  Route wiring as necessary to the rear of the base and through the cen-

ter hole. Refer to Figure 2.3. 

Select a location likely to intercept an intruder moving beneath and across 

the coverage pattern. Refer to Figure 2.1. Recommended mounting height 

range is 8 to 18 feet (2.4 to 5.5 m).
The surface should be solid and vibration-free. (i.e. Drop tiles should be 

secured if the area above the tiles is used as an air return for HVAC sys-

tems).

 F.01U.263.663 | 01 | 05.2012 | 9

Turn on all heating and cooling sources that would normally be in opera-

tion during times of protection. Stand away from the unit and outside the 

coverage pattern, then monitor the background noise for at least three 

minutes.
Readings should not deviate from the reference level more than ±0.15 

VDC. For readings outside these limits; eliminate the cause, rotate the unit 

slightly, or mask out the mirror segment(s) looking down at the thermal 

disturbance.

Again walk across the farthest edge of required coverage.
A minimum voltage change of 1.0 VDC from the reference level is required 

in the wintertime when the background temperature is cool. This will make 

up for summertime, when the background is warmer. If testing the unit in 

the summertime, the minimum recommended voltage change is 0.75 VDC.
When testing is completed, remove the TC6000 Test Cord, and twist-lock 

the cover into place.

The DS938Z performs several supervision features that, combined with 

the advanced motion detection capabilities of the detector, provide an ex-

tremely 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 using coded 

pulses. The supervision trouble signal activates the Trouble Output 

available at terminal 8, which should be connected to a 24-hour zone.

The supervision features function as follows:

ON

Unit alarm

2 Flashes

Motion monitor time out

4 Flashes

PIR self-test failure

PIR:  The operation of the PIR is electronically checked approximately ev-

ery 12 hours. If the PIR fails, the Alarm/Test LED will fl ash four times and 

the Trouble Output will activate.
Motion Monitor Supervision:  This feature verifi es that the detector has a 

clear view of the detection area and has not been blocked. When selected 

using switches S4 and S5, a supervision timer is activated. A trouble con-

dition 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 4.0 Feature Selection for proper switch settings.