System Sensor Complete Guide to 4W-B Wiring Diagram for Smoke Alarms

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Figure 1: Mounting of Detector

S0121-00

The i3 Series heads and bases are keyed so that a 2-wire head will only mount to a 2-wire base, and a 4-wire head will only mount to a 4-wire base. The heads and bases are clearly identified as either 2-wire or 4-wire. When mounting the i3 Series, ensure that the head is mounted to the correct base.

Tamper-Resistant Feature

The i3 Series detectors include a tamper-resistant feature that prevents removal from the mounting base without the use of a tool. To engage the tamper-resistant feature, cut the small plastic tab located on the mounting base (Figure 2), and then install the detector. To remove the detector from the base once it has been made tamper resistant, use a small screwdriver to depress the square tamper release tab, located on the skirt of the mounting base, and turn the detector counterclockwise.

Figure 2: Tamper-Resistant Feature

DIRECT MOUNT

HOLES

Wiring Installation Guidelines

All wiring must be installed in compliance with the National Electrical Code, applicable state and local codes, and any special requirements of the local Authority Having Jurisdiction.

Proper wire gauges should be used. The conductors used to con- nect smoke detectors to the alarm control panel and accessory devices should be color-coded to reduce the likelihood of wiring errors. Improper connections can prevent a system from respond- ing properly in the event of a fire.

The screw terminals in the mounting base will accept 14–22 gauge wire. For best system performance, all wiring should be installed in separate grounded conduit; do not mix fire alarm system wiring in the same conduit as any other electrical wiring. Twisted pair may be used to provide additional protection against extraneous electrical interference.

Wire connections are made by stripping approximately 14-inch of insulation from the end of the feed wire, inserting it into the proper base terminal, and tightening the screw to secure the wire in place.

Two-Wire Compatibility

System Sensor two-wire smoke detectors are marked with a compatibility identifier located on the label on the back of the product. For two-wire models 2W-B and 2WT-B, connect detectors only to compatible alarm control panels as identified by System Sensor’s compatibility chart. This chart contains the current list of detectors and UL Listed compatible control units. A copy of this list is available from System Sensor upon request.

Wiring Diagrams

Figure 3a: Wiring Diagram, 2W-B and 2WT-B

SNAP OFF TAB

FOR TAMPER LOCK

TAMPER

RELEASE TAB

S0226-00

Do NOT Install Detectors in the Following Areas:

In or near areas where particles of combustion are normally

 

present such as kitchens; in garages (vehicle exhaust); near

 

furnaces, hot water heaters, or gas space heaters.

In very cold or very hot areas.

2-WIRE + ZONE –

2-WIRE CONTROL PANEL

RA400Z

(

(

(

(

(

1

2

3

4

5

)

)

)

)

)

+ IN

+ OUT

– IN/OUT

RA +

RA –

2W-B or 2WT-B

EOL

RESISTOR

RA400Z

(

(

(

(

(

1

2

3

4

5

)

)

)

)

)

+ IN

+ OUT

– IN/OUT

RA +

RA –

2W-B or 2WT-B

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• In wet or excessively humid areas, or next to bathrooms with

showers.

• In dusty, dirty, or insect-infested areas.

• Near fresh air inlets or returns or excessively drafty areas. Air

conditioners, heaters, fans, and fresh air intakes and returns

can drive smoke away from the detector.

Consult NFPA 72, the local Authority Having Jurisdiction (AHJ), and/or applicable codes for specific information regarding the spacing and placement of smoke detectors.

CAUTION

Smoke detectors are not to be used with detector guards unless the combination has been evaluated and found suitable for that purpose.

Figure 3b: Wiring Diagram, 4W-B and 4WT-B

AUX OR +

 

 

 

 

 

 

 

 

 

EOL

SMOKE

 

 

 

 

 

 

 

 

 

 

RELAY

POWER

 

 

 

 

 

 

 

 

 

(A77-716B)

IDC

 

 

 

 

 

 

 

 

 

 

+

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EOL

 

 

 

 

 

 

 

 

 

 

 

RESISTOR

 

 

(

(

(

(

(

(

(

(

(

(

4-WIRE

 

1

2

3

4

5

1

2

3

4

5

 

)

)

)

)

)

)

)

)

)

)

CONTROL

+IN

+OUT

–IN/OUT

NO

COM

+IN

+OUT

–IN/OUT

NO

COM

 

 

 

 

 

 

 

 

 

 

PANEL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4W-B or

 

 

4W-B or

 

 

 

 

4WT-B

 

 

4WT-B

 

S0134-00

D100-96-00

2

I56-1800-08R

Image 2
Contents General Description 4W-B, 4WT-B Before InstallingPower-up Sequence for LED Status Indication Detector LED ModesTwo-Wire Compatibility Tamper-Resistant FeatureWiring Installation Guidelines Wiring DiagramsMaintenance InstallationTesting Loop Verification models 2W-B and 2WT-B onlyWire 4-wire Physical Specifications

4WT-B, 2WT-B, 4W-B specifications

The System Sensor 4W-B, 2WT-B, and 4WT-B are advanced fire detection devices designed to enhance safety and ensure rapid response in case of a fire. These detectors are essential components in modern fire alarm systems, renowned for their reliability and technological prowess.

The 4W-B is a photoelectric smoke detector that uses advanced sensing technology to identify the presence of smoke in its environment. Its design includes a highly sensitive photoelectric chamber that absorbs light reflected by smoke particles. This technology enables the 4W-B to respond quickly to smoldering fires, which typically produce large amounts of smoke before flames are visible. One of its standout features is its built-in sounder, which provides an audible alert upon detection, ensuring the occupants are promptly notified.

The 2WT-B and 4WT-B models incorporate both smoke detection and heat sensing features, making them ideal for various environments, including commercial spaces and industrial applications. The 2WT-B, classified as a two-wire technology device, offers simple installation without the need for additional wiring. It integrates seamlessly with fire alarm control panels, allowing for efficient monitoring and maintenance.

The 4WT-B variant is equipped with multiple sensing technologies, combining heat detectors and photoelectric sensing. This dual approach enhances its ability to detect various types of fires, whether they are fast-flaming or smoldering. Its advanced algorithms minimize false alarms, ensuring that only genuine threats trigger alerts.

All three models feature an array of characteristics that make them user-friendly and efficient. They come with adjustable sensitivity settings, allowing customization based on specific environmental conditions. The detectors’ LED indicators provide visual status updates, making it easier for maintenance personnel to monitor their functionality. Additionally, their robust design ensures durability, suitable for both indoor and outdoor applications.

Overall, the System Sensor 4W-B, 2WT-B, and 4WT-B fire detectors represent a significant advancement in fire safety technology. Their combination of reliability, versatility, and ease of installation positions them as preferred choices for architects, engineers, and safety professionals seeking to protect lives and property effectively. With these devices, users can have peace of mind knowing they have a sophisticated fire detection system at their disposal.