Bosch Appliances DS938Z Mounting, False Alarm Prevention, Coverage Margin, Supervision Feature

2 Mounting

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).

6.2 False Alarm Prevention

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

30 ft				30 ft
26 ft 20 ft 13 ft	7 ft	0 ft	7 ft	13 ft 20 ft 26 ft

9 m	30 ft
8 m	26 ft
6 m	20 ft
4 m	13 ft
2 m	7 ft
0 m	0 ft
2 m	7 ft
4 m	13 ft
6 m	20 ft
8 m	26 ft
9 m	30 ft

≤5.5 m		≤18 ft
4.6 m	AR13-18	15 ft
≥4.0 m		≥13 ft
0 m		0 ft
≤4.0 m		≤13 ft
3.0 m	AR8-13	10 ft
≥2.4 m		≥8 ft
0 m		0 ft
	8 m 6 m 4 m 2 m 0 m 2 m 4 m 6 m 8 m
9 m		9 m

disturbance.

6.3 Coverage Margin

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.

6.4 Supervision Feature

Figure 2.1: Coverage Pattern

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.

	Enclosure release tabs
Test lead
cutout	Interface connector
Optical module
	Cover twist tabs (4)

Enclosure release openings (2)

Anti-vandal
locking screw	Interface
holes (2)
	pins

Figure 2.2: Opening cover

NOTICE!

Slightly rock the enclosure side-to-side during removal to overcome the friction caused by the base-to-enclosure terminal pins.

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.

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:

LED	CAUSE
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 flash four times and the Trouble Output will activate.

Motion Monitor Supervision: This feature verifies 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.

4 © 2012 Bosch Security Systems, Inc. F.01U.263.663 01 05.2012 9