Johnson Controls 2951JR - User Manual

JC-400-005 1 I56-3573-001R
This sensor must be installed in compliance with the control panel system
installation manual. The installation must meet the requirements of the Au-
thority Having Jurisdiction (AHJ). Sensors offer maximum performance when
installed in compliance with the National Fire Protection Association (NFPA);
see NFPA 72.
GENERAL DESCRIPTION
Model 2951JR is an intelligent sensor that combine a state-of-the-art photoelec-
tronic sensing chamber with communications.
Two LEDs on each sensor light to provide a local, visible sensor indication.
Remote LED annunciator capability is available as an optional accessory (Part
No. RA400Z). The sensor will support either FlashScan™ or CLIP (Classic Loop
Interface Protocol) SLC communication mode.
Johnson Controls panels offer different feature sets across different models.
As a result, certain features of the 2951JR may be available on some control
panels, but not on others. The possible features available in the 2951JR, if sup-
ported by the control unit are:
1. The panel controls the LED operation on the sensor. Operational modes are
RED blink, RED continuous, GREEN blink, GREEN continuous, and off.
2. The remote output may be synchronized to the LED operation or con-
trolled independent of the LEDs.
When 2951JR is used in duct applications with a DNR/DNRW, testing can be
done remotely using approved System Sensor test accessories, eliminating the
need for a test coil.
NOTE: Only System Sensor approved accessories may be used with the 2951JR.
The 2951JR requires compatible addressable communications to function
properly. Connect the 2951JR sensor to listed-compatible control panels only.
SPACING
Johnson Controls recommends spacing sensors in compliance with NFPA 72.
In low air flow applications with smooth ceilings, space sensors 30 feet apart.
For specific information regarding sensor spacing, placement, and special ap-
plications, refer to NFPA 72 or the System Smoke Detector Application Guide,
(A05-103-XX) available from Johnson Controls.
Duct Applications: 2951JR is listed for use in ducts. See Duct Applications
Guide A05-1004 for details on pendant mount applications.
WIRING INSTRUCTIONS
All wiring must be installed in compliance with the National Electrical Code,
applicable local codes, and any special requirements of the Authority Having
Jurisdiction. Proper wire gauges should be used. The installation wires should
be color-coded to limit wiring mistakes and ease system troubleshooting. Im-
proper connections will prevent a system from responding properly in the
event of a fire.
Disconnect power from the SLC communication line before installing sensors.
1. Wire the sensor base (supplied separately) per the wiring diagram, Figure 1.
2. Set the desired SLC address on the sensor address switches.
3. Install the sensor into the sensor base. Push the sensor into the base
while turning it clockwise to secure it in place.
I56-3573-001R
INSTALLATION AND MAINTENANCE INSTRUCTIONS
2951JR Intelligent Photoelectric
Smoke Sensor with Remote Test
Capability in Duct Applications
SPECIFICATIONS
Operating Voltage Range: 15 to 32 VDC
Standby Current: 300µA @ 24 VDC (one communication every 5 seconds with LED blink enabled)
Maximum Alarm Current (LED on): 6.5 mA @ 24 VDC
Operating Humidity Range: 10% to 93% Relative Humidity, Non-condensing
Operating Temperature Range: 32°F to 120°F (0°C to 49°C) 2951JR, -4°F to 158°F (-20°C to 70°C) 2951JR in duct applications
Height: 2.0˝ (51 mm) installed in B210LPJ and B501J Bases
Diameter: 6.1˝ (155 mm) installed in B210LPJ Base; 4.1˝ (104 mm) installed in B501J Base
Weight: 5.2 oz. (147 gm)
4. After all sensors have been installed, apply power to the control unit and
activate the communication line.
5. Test the sensor(s) as described in the TESTING section of this manual.
FIGURE 1. WIRING DIAGRAM:
3
2
1
3
2
1
+
-
-
+
+ -
REMOTE
ANNUNCIATOR
UL LISTED COMPATIBLE
CONTROL PANEL
OPTIONAL RETURN LOOP
DO NOT LOOP WIRE
UNDER TERMINAL 1 OR 2.
BREAK WIRE RUN TO
PROVIDE SUPERVISION
OF CONNECTION.
C0147-00
Note: Only System Sensor approved accessories may be used with the 2951JR.
FIGURE 2. ROTARY SLC ADDRESS SWITCHES:
TENS ONES
9
10
11
12
13
14
15
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
0
C0162-00
CAUTION
Dust covers provide limited protection against airborne dust particles during
shipping. Dust covers must be removed before the sensors can sense smoke.
Remove sensors prior to heavy remodeling or construction.
TAMPER-RESISTANCE
Model 2951JR includes a tamper-resistant capability that prevents its removal
from the bracket without the use of a tool. Refer to the base manual for details
on making use of this capability.
TESTING
Before testing, notify the proper authorities that the system is undergoing
maintenance, and will temporarily be out of service. Disable the system to
prevent unwanted alarms.
All sensors must be tested after installation and periodically thereafter. Test-
ing methods must satisfy the Authority Having Jurisdiction (AHJ). Sensors
offer maximum performance when tested and maintained in compliance with
NFPA 72. The sensor can be tested in the following ways:
507 E. Michigan Street
Milwaukee, WI 53201
Phone: 414.524.4000

Summary

Specifications

General Description

Spacing and Duct Applications

Duct Applications

2951JR is listed for use in ducts. Refer to Duct Applications Guide A05-1004 for pendant mount.

Wiring Instructions

Tamper-Resistance

Testing Methods

Functional Magnet Test

Tests sensor electronics and panel connections by simulating smoke with a magnet.

Smoke Entry Testing

Uses aerosol generators or canned smoke agents to test sensor response to smoke.

Remote Test Capability

Utilizes specific accessories for remote testing of the sensor's functionality.

High Sensitivity Setting

Requires a 90-day test period to ensure environment suitability for 0.2%-0.5% per foot settings.

Smoke Detector Guards

Note that smoke detectors should only be used with guards if evaluated and found suitable.

Cleaning Procedure

FCC Statement

Overview

1. Function Description
2. Usage Features
3. Maintenance Features
4. Cleaning Procedure

The 2951JR Intelligent Photoelectric Smoke Sensor is a sophisticated device designed for use in duct applications, integrating a state-of-the-art photoelectric sensing chamber with advanced communication capabilities. This sensor is an intelligent component within a larger fire alarm system, offering reliable smoke detection and remote testing functionalities.

Function Description

The primary function of the 2951JR is to detect smoke within duct systems. It utilizes a photoelectric sensing chamber to identify the presence of smoke particles, triggering an alarm when a predefined obscuration level is reached. The sensor is designed to operate within a wide range of environmental conditions, including varying temperatures and humidity levels, making it suitable for diverse industrial and commercial settings.

The 2951JR is an intelligent sensor, meaning it communicates with a control panel using either FlashScan™ or CLIP (Classic Loop Interface Protocol) SLC communication modes. This intelligent communication allows the control panel to manage the sensor's operation, including its LED indicators and remote output. The sensor features two onboard LEDs that provide local, visible status indications. These LEDs can be controlled by the panel to display various operational modes, such as red blink, red continuous, green blink, green continuous, or off, depending on the system's status and configuration.

A key feature of the 2951JR is its remote test capability, which is particularly beneficial for duct applications. When used with a DNR/DNRW duct smoke detector, the sensor can be tested remotely using approved System Sensor test accessories like the RTS451, RTS451KEY, RTS151, or RTS151KEY. This eliminates the need for a physical test coil, simplifying maintenance and ensuring the sensor's functionality without direct access to the unit. The remote output can be synchronized with the LED operation or controlled independently, offering flexibility in system design and response.

The sensor also incorporates a tamper-resistant capability, designed to prevent unauthorized removal from its mounting bracket without the use of a specialized tool. This enhances the security and integrity of the fire alarm system.

Usage Features

The 2951JR is designed for straightforward installation and integration into compatible control panels. It requires a sensor base (supplied separately) and proper wiring according to the provided wiring diagram, adhering to the National Electrical Code and local regulations. The desired SLC address is set on rotary switches, allowing for unique identification within the system. Once installed, the sensor is secured into its base by pushing and turning it clockwise.

For optimal performance, Johnson Controls recommends spacing sensors in compliance with NFPA 72 guidelines. In low airflow applications with smooth ceilings, a spacing of 30 feet apart is suggested. Specific guidance for sensor spacing, placement, and special applications can be found in NFPA 72 and the System Smoke Detector Application Guide.

The sensor supports high sensitivity settings, specifically 0.2% to 0.5% per foot obscuration. This setting is intended for use in smoke-free, environmentally controlled environments such as computer rooms and clean rooms. When utilizing this high sensitivity, a 90-day test period is required to ensure the detector's environment is suitable. During this period, the detectors must operate continuously, and all environmental factors (temperature, humidity, airflow, occupancy) should be similar to the intended application. An electronic history file or printer must record all events associated with the detectors under testing. If no alarms or pre-alarms are recorded after 90 days, the system can be set to the tested pre-alarm level within the specified range.

Maintenance Features

Regular testing and cleaning are crucial for maintaining the optimal performance of the 2951JR. Before any maintenance, proper authorities must be notified, and the system or relevant zone should be disabled to prevent unwanted alarms.

The sensor can be tested in several ways:

1. Functional Magnet Test: A test magnet (P/N M02-04-01 or M02-09-00) can be held in the designated magnet test area. This electronically simulates smoke in the sensing chamber, testing the sensor's electronics and its connection to the control panel. The sensor should alarm the panel, and the LEDs will indicate its status as controlled by the panel.
2. Smoke Entry Test: Canned aerosol simulated smoke, such as products from Home Safeguard Industries (25S), SDi (CHEK02, CHEK06, SOLOA4, SMOKESABRE-01), or the GEMINI model 501 aerosol generator, can be used to test smoke entry. The aerosol is applied until the panel alarms. It is important to follow the manufacturer's instructions for proper use of these products, as misuse or overuse can have long-term adverse effects on the smoke detector.
3. Remote Test: As mentioned, the 2951JR can be remotely tested using specific System Sensor test accessories, which is particularly convenient for duct applications.

If a sensor fails any of these tests, it should be cleaned and retested. If it continues to fail after cleaning, it must be replaced.

Cleaning Procedure:

1. Remove the sensor from the system.
2. Remove the sensor cover by pressing the four removal tabs.
3. Carefully vacuum the screen. If further cleaning is needed, remove the chamber cover/screen assembly by pulling it straight out.
4. Use a vacuum cleaner or clean, compressed air to remove dust and debris from the sensing chamber.
5. Reinstall the chamber cover/screen assembly, ensuring it is firmly in place.
6. Replace the sensor cover, aligning it with the LEDs, and gently pushing it until it locks into place.
7. Reinstall the detector into the system.
8. Test the detector as described in the TESTING section.
9. Reconnect disabled circuits and notify authorities that the system is back online.

Dust covers are provided during shipping to offer limited protection against airborne dust. However, these covers must be removed before the sensors can sense smoke. It is also recommended to remove sensors prior to heavy remodeling or construction to prevent damage or contamination.

Johnson Controls 2951JR Specifications