System Sensor 1551B User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

1551B Plug-in Intelligent

3825 Ohio Avenue, St. Charles, Illinois 60174

Ionization Sensors with Communications

Specifications

Diameter: 6.1 inches (155 mm) installed in B501B

4.1 inches (104 mm) installed in B501
Height: 2.3 inches (58 mm)
Weight: 5 ounces (150 gm)
Operating Temperature Range: -10° to 60°C (14° to 140°F)

Note: Do not install where normal ambient temperatures extend beyond 0° to 49°C

(32° to 120°F)
Operating Humidity Range: 10% to 93% Relative Humidity
Mounting: B501B flanged base

B501 flangeless base

B501 with RMK400 recessed mounting kit

B501BH Base with horn
Maximum Air Velocity: 1500 Ft./Min. (7.6 m/S)
Voltage Range: 15 to 32 VDC
Standby Current: 200 µA maximum @ 24 VDC (with no communication)

300 µA average maximum @ 24 VDC (with one communication every five seconds

and LED blink enabled)
LED Current: 6.5 mA @ 24 VDC

A Division of Pittway

1-800-SENSOR2, FAX: [phone]

Before Installing

Please thoroughly read Guide for Proper Use of System
Smoke Detectors (I56-407-XX), which provides detailed in-

formation on sensor spacing, placement, zoning, and spe­cial applications. Copies of this manual are available from
System Sensor.

General Description

Models 1551B dual-chamber ionization intelligent sensors
utilize a state-of-the-art, unipolar sensing chamber. These
sensors are designed for use with duct housings DH500
and DH500AC/DC only, and to be used with compatible
control panels only. Connect sensors only to compatible
control units. (For installation in Canada, refer to CAN/
ULC-S524-M86, Standard for the Installation of Fire Alarm
Systems and CEC Part 1, Sec. 32.)

Tw o LED’s on each sensor light to pr ovide a local 360° vis­ibility of the sensor indication. The LED’s can be latched
on by code command from the panel for an alarm indica­tion. The LED’s can also be unlatched to the normal condi­tion by code command. Remote LED annunciator
capability is available as an optional accessory (Part No.
RA400).

Wiring Guide

Model 155 1B can be used with an y one of a variety of plug­in bases. Therefore, connect all wiring following the
installation instructions provided with the base that was
selected for use with the 1551B. As Figure 1 indicates,
bases are equipped with screw terminals for all
appropriate connections.

NOTE: All wiring must conform to applicable local codes,

ordinances, and regulations.

NOTE: Verify that all sensor bases are installed and that

the wiring polarity is correct at each base.

WARNING

Remove power from the loop before installing sensors.

1. Install sensors:
a. Verify that the sensor type matches the type written

on the label on the base.

b. Set the sensor to the desired address and record it on

the label on the base.
c. Place the sensor into the sensor base.
d. Rotate the sensor clockwise until it drops into place.
e. Continue rotating the sensor clockwise until it locks

in place.

D500-40-00 1 I56-1436-00

Figure 1. Wiring diagram:

CONTROL PANEL

U.L. LISTED COMPATIBLE

REMOTE ANNUNCIAT OR

+-

+

2

3

1

-

­+

WARNING

CLASS A OPTIONAL WIRING

CAUTION: Do not loop wire under terminal 1 or 2.
Break wire run to provide supervision of connections.

The sensor cannot detect smoke if the dust cover is in­stalled.

2. Tamper-Resist Feature
The sensor bases include a tamper-resist feature that,
when it is enabled, prevents r emoval of the sensor with­out the use of a tool. See the sensor base installation in­struction manual for details on the use of this feature.

3. After all sensors have been installed, apply power to the
control unit.

2

3

1

2

3

1

A78-1253-01

Sensors must be tested after installation and periodic main­tenance. Test the sensor as follows:

A. Test Magnet (Model No. M02-04-00)

1. Place the magnet against the cover opposite the test
module socket to activate the test feature (see Figur e 2).

2. The LED’s should latch on within 10 seconds, indicat­ing alarm and annunciating the panel.

B. Test Tool (Model No. MOD400R)

Use the MOD400R with a DMM or Voltmeter to check
the sensor sensitivity as described in the MOD400R
manual.

4. Test the sensor by positioning a test magnet against the
sensor plastic directly opposite the test meter socket
(Figure 2). The alarm level should be recognized by the

NOTE: The MOD400R can be used to test the sensitivity of

only those sensors connected to control panels that

do NOT use drift compensation.
panel and the LED controlled by communication com­mand from the panel.

C. Aerosol Generator (Gemini 501) per NFPA 72

The field test tool is the GEMINI Model 501 aerosol gen-

5. The reset of the sensor LED is controlled by communica­tion command from the panel.

erator. Set the generator to represent 4%/ft to 5%/ft ob­scuration as described in the GEMINI 501 manual. Using
the bowl shaped applicator, apply aerosol until unit

Testing

alarms.
Before testing, notify the proper authorities that the smoke
sensor system is undergoing maintenance, and therefore
the system will be temporarily out of service. Disable the
zone or system undergoing maintenance to prevent un-

NOTE: This test only verifies smoke's ability to enter the

sensing chamber and initiate an alarm. It does
NOT test sensitivity.

wanted alarms.

Notify the proper authorities that the system is back on line.

D500-40-00 2 I56-1436-00