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Installation Instructions

D296 and D297

Long Range Beam Smoke Detectors

1.0 Description

The D296 and D297 are long range projected beam type smoke

detectors which consist of a separate transmitter and receiver. Internal

pointability provides coverage flexibility without the need for brackets.

Automatic Signal Synchronization and Range Adjustment reduce

installation costs. Selectable sensitivity and alarm response time

provide installation flexibility.

2.0 Specifications

• Operating Voltage: D296: 18.0 to 32.0 VDC

D297: 10.2 to 15.0 VDC

• Standby Current: D296: Receiver - 45 mA @ 24.0 VDC

Transmitter - 20 mA @ 24.0 VDC

D297: Receiver - 50 mA @ 12.0 VDC

Transmitter - 20 mA @ 12.0 VDC

• Receiver Alarm

Current: D296: 60 mA @ 24.0 VDC

D297: 75 mA @ 12.0 VDC

• Range (distance

between transmitter

and receiver): 30 to 350 ft. (9 to 107 m)

• Spacing (distance

between systems): Allow no more than 60 ft. (18 m) between

systems. Sixty foot spacing is confirmed

by Underwriters Laboratories, Inc. testing.

• Pointability: Internally pointable optics for ±90°

horizontal, and ±10° vertical adjustment.

• Sensitivity: Field selectable for 20, 30, 40, 50, 60, or

70 percent beam obscuration.

• Alarm Contacts: Normally Open contacts rated 1 amp,

60 VDC maximum for DC resistive loads.

Do not use with capacitive or inductive

loads.

• Trouble Contacts: Normally Closed contacts rated 1 amp,

60 VDC maximum for DC resistive loads.

Do not use with capacitive or inductive

loads.

• Aux. Alarm

Contacts: Form "C" (NO, C, NC) contacts rated

1 amp, 60 VDC maximum for DC resistive

loads. Do not use with capacitive or

inductive loads.

• Tamper: Receiver: Access door tamper switch in

series with trouble contacts.

Transmitter: Upon cover’s removal, cover

tamper switch interrupts

transmission.

• System Signaling: Conventional 4-wire system. Not for use

with systems that incorporate an alarm

verification feature.

• Signal Delay: Fire: Selectable 30 seconds or 5

seconds

Trouble: 20 ± 2 seconds.

• Temperature: The storage and operating temperature

range is -22° to +130°F (-30° to +54°C).

For UL Listed installations, the range is

+32° to +130°F (0° to +54°C).

• Mounting: The units are designed to be mounted to

4 in. (10 cm) square or octagonal

electrical boxes (not supplied).

• Listings and

Approvals: UL S3019

ULC CS692

MSFM Permit #1943

NY City MEA Acceptance #MEA274-93-E

CSFM #7260-1062:106

FM Job #OX2A9.AY



• Standard

Accessories: D306 Remote Test/Indicator Plate and

Test Cable

• Options: D307 Remote Indicator Plate, D308

Field Test Kit, D309 Alignment Light, and

D1005 Test Cord.

3.0 Principle of Operation

Each D296 or D297 beam smoke detector has a separate transmitter

and receiver. The transmitter transmits an invisible infrared beam of

a specific frequency and intensity. The receiver detects, then measures

the beam’s intensity (see Figure 1).

Figure 1 - Infrared Transmission

As the beam is obscured by smoke, the receiver senses a decrease

in the signal strength and measures that decrease. The receiver

compares the signal level with two preset thresholds: an alarm

threshold which is set using the sensitivity switch and a trouble

threshold which is preset at approximately 10%. If the signal falls

below the alarm threshold for the programmed alarm period, the

receiver signals an alarm (see Figure 2).

Figure 2 - Beam Obscuration

If the signal falls below the trouble threshold for more than 20 seconds,

such as might happen if the beam is blocked by a foreign object, the

receiver signals a trouble condition (see Figure 3).

Figure 3 - Beam Blockage

The receiver automatically compensates for the gradual loss of signal

due to dust/dirt build-up on the cover. After 50 percent of the signal is

lost, the receiver will indicate a trouble. When the dust/dirt build-up is

cleaned or the blockage is removed, the detector automatically goes

back to its normal operation level.

A trouble will be indicated at the receiver if the beam strength is

increased by more than 20% for greater than 20 seconds. Causes

include improper initial alignment or the removal of a partial beam

blockage at the time of alignment. Preform a fine-tune alignment

(see Section 7.3).

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Résumé du contenu

Page 1 - 3.0 Principle of Operation

Installation InstructionsD296 and D297Long Range Beam Smoke Detectors1.0 DescriptionThe D296 and D297 are long range projected beam type smokedetector

Page 2

Page 3 - 5.0 Mounting

Page 4 - 7.0 SET-UP

Page 5 - Front Bore Sigh

Page 6 - 8.0 Other Information

Page 7 - 30% 40% 50%

Page 8

Page 9 - 9.0 Troubleshooting

Page 10

Page 11

Page 12

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Bosch D296/D297 Spécifications

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