Bosch DS778 - User Manual

Installation Instructions
for the DS778
ASIC-Based
Passive Infrared Intrusion Detector
1.0 Specifications
• Input Power: 6.0 VDC to 15.0 VDC; 18 mA @ 12.0 VDC
• Standby Power: There is no internal standby battery.
Connect to DC power sources capable of
supplying standby power if primary power
fails. For each hour of standby time
needed, 18 mAh are required. For UL
Certificated Installations, A minimum of
4 hours (72 mAh) is required.
• Coverage: 200 ft. by 15 ft. (60 m by 4.5 m)
• Sensitivity: Adjustable for Intermediate or High.
• Alarm Relay: Form “C” reed relay with contacts rated at
28 VDC, 125 mA max. for DC resistive
loads.
• Tamper Switch: Normally Closed (with cover in place)
tamper switch. Contacts rated at 28 VDC,
125 mA max.
• Temperature: The storage and operating range is -40°F
to +120°F (-40°C to +49°C). For UL
Certificated installations, the temperature
range is +32°F to +120°F (0°C to +49°C).
• Options: B328 Gimbal Mount Bracket, B335 Low
Profile Mount Bracket, B338 Ceiling Mount
Bracket, TC6000 Test Cord.
Note: Misalignment of the detector when using an optional
mounting bracket may reduce range.
2.0 Mounting
2.1 Mounting Considerations
• Select a location that is most likely to intercept an intruder moving
across the coverage pattern. The recommended mounting height
range is 6.5 ft. to 8.5 ft. (2 m to 2.6 m).
* The mounting surface should be solid and vibration free.
• Avoid direct hot and/or cold drafts, direct sunlight, heat sources,
windows, air conditioning outlets, and small animals.
• This detector won’t detect through glass.
• See Section 8.0 Coverage Patterns .
2.2 Surface or Corner Mounting
Note: For bracket mounting, refer to the installations supplied
with the bracket.
• Remove the cover. Insert a thin flathead screwdriver into the
notch at the bottom of the cover and pry up.
• Remove the chassis screw in the upper right corner of the
assembly (see Figure A ). To remove the circuit board/mirror unit
from the enclosure, push the circuit board/mirror unit toward the
top of the enclosure until it clears its four retainer tabs, then lift
out.
• Open two holes (see Figure A ) for surface or corner mounting.
Corner
Mounting
Holes (4)
Surface Mounting Holes
or Single Gang
Box Holes (2)
Bracket
Mounting
Hole
Wiring Knockouts
+2
0
-8
-16
+2
0
-8
-16
Noise
Voltage
12
3
Tamper Switch
LED
Configuration
Switches
T-Strip
Chassis
Screw
OPEN
-+
NO NCCTT
Figure A - Location of Major Items -
Circuit Board and Detector Enclosure
• Mark the location for the mounting screws. Use the enclosure
as a template. Pre-start the mounting screws.
• Open the appropriate wiring knockout and route the wiring
through (see Section 3.0 Wiring ).
• Securely attach the detector.
• Replace the circuit board/mirror unit.
• Adjust the mirror.
Note: Excessive handling of the mirror surfaces may lead to
performance degradation.
- Adjust vertically from +2° to -18° by sliding the mirror forward
or back. See
Figures B and C to set the correct Vertical Angle
based on the mounting height and desired range.
Mounting Height [ft. (m)]
6.5 (2)
7.5 (2.3)
8.5 (2.6)
Vertical Angle Setting
-1°
-2°
-2°
200 ft. (60 m)
100 ft. (30 m)
-2°
-2°
-3°
Figure B - Mounting Height/Range Chart
- The angle adjust markings are on the sides of the mirror
(see Figure C ).
-16
-8
0
+2
Mirror
+2
0
-8
-16
+2
0
-8
-16
Set
at
-1°
Figure C - Setting Vertical Angle
- Slide the mirror forward or back until the angle hash marks
are in-line with the markers on each side of the frame.

Summary

Specifications

Input Power

Specifies the required voltage and current for the detector's operation.

Standby Power

Details requirements for backup power and minimum standby time for UL certifications.

Coverage

Defines the detection range and width of the sensor's pattern.

Sensitivity

Describes the adjustable sensitivity settings for detection.

Alarm Relay

Details the specifications of the Form "C" relay contacts.

Tamper Switch

Specifies the normally closed tamper switch contacts.

Temperature

Outlines the operating and storage temperature ranges.

Options

Lists available optional mounting brackets and accessories.

Mounting

Mounting Considerations

Guidance on selecting optimal locations and avoiding interference.

Surface or Corner Mounting

Instructions for physical installation and enclosure removal.

Wiring

Terminal Descriptions

Explains the function of each terminal connection on the detector.

Configuration Switches

LED Operation

Configuration options for the LED indicator's behavior during an alarm.

Sensitivity Mode

Settings for adjusting detection sensitivity based on environmental conditions.

Setup and Walk Testing

Final Tests

Maintenance

Coverage Patterns

Masking Information

Guidance on using masking tape to modify coverage areas.

Bosch DS778 Specifications

General

Brand	Bosch
Model	DS778
Category	Security Sensors
Language	English