System Sensor 2W-B User Manual

INSTALLATION AND MAINTENANCE INSTRUCTIONS

Series

Photoelectric Smoke Detector	3825 Ohio Avenue, St. Charles, Illinois 60174
	1-800-SENSOR2, FAX: [phone]
Models: 2W-B, 2WT-B	www.systemsensor.com
4W-B, 4WT-B

Before Installing

Please read thoroughly System Sensor manual A05-1003,

Applications Guide for System Smoke Detectors, which provides detailed information on detector spacing, placement, zoning, wiring, and special applications. Copies of this manual are available from System Sensor at no charge.

NOTICE: This manual shall be left with the owner/user of this equipment.

IMPORTANT: This detector must be tested and maintained regularly following NFPA 72 requirements. At a minimum, cleaning should be performed annually.

General Description

Models 2W-B and 2WT-B are 2-wire photoelectric smoke detectors; models 4W-B and 4WT-B are 4-wire photoelectric smoke detectors. All models incorporate a state-of-the-art optical sensing chamber and an advanced microprocessor. The microprocessor allows the detector to automatically adjust its sensitivity back to the factory setting when it becomes more sensitive due to contaminants settling in its chamber. In order for this feature to work properly, the chamber must never be opened while power is applied to the smoke detector. This includes cleaning, maintenance or screen replacement. Should it become necessary, the screen/sensing chamber is field replaceable. Models 2WT-B and 4WT-B also feature a restorable, built-in, fixed temperature (135°F) thermal detector and are also capable of sensing a freeze condition if the temperature is below 41°F.

All i3 Series detectors are designed to provide open area protection. Two-wire models must be used with compatible UL Listed panels only.

When used with an i3 Series compatible control panel or the i3 Series 2W-MOD module (refer to installation manual D500-46-00), the 2W-B and 2WT-B are capable of generating a “maintenance needed” signal. The 2W-MOD can indicate a need for cleaning, replacement, or a freeze condition (2WT-B only) at the control panel or module.

Installation of the 2W-B, 2WT-B, 4W-B, and 4WT-B detectors is simplified by the use of a mounting base that may be pre-wired to the system, allowing the detector to be easily installed or removed. The mounting base installation is further simplified by the incorporation of features compatible with drywall fasteners.

Two LEDs on the detector provide a local visual indication of the detector’s status:

Table 1: Detector LED Modes

	Green LED	Red LED
Power-up	Blink 10 sec	Blink 10 sec
Normal (standby)	Blink 5 sec	—
Out of sensitivity	—	Blink 5 sec
Freeze Trouble	—	Blink 10 sec
Alarm	—	Solid

After an initial power-up delay, the red and green LEDs will blink synchronously once every ten seconds. It will take approximately 80 seconds for the detector to finish the power-up cycle (see Table 2).

Table 2: Power-up Sequence for LED Status Indication*

Condition	Duration
Initial LED Status Indication	80 seconds
Initial LED Status Indication	4 minutes
(if excessive electrical noise is present)

*Refer to Electrical Specifications for start-up time in conjunction with panel alarm verification.

NOTE: If, during power-up, the detector determines there is excessive electrical noise in the system such as those caused by improper grounding of the system or the conduit, both LEDs will blink for up to 4 minutes before displaying detector status (see Table 2).

After power-up has completed and the detector is functioning normally within its listed sensitivity range, the green LED blinks once every five seconds. If the detector is in need of maintenance because its sensitivity has shifted outside the listed limits, the red LED blinks once every five seconds. When the detector is in the alarm mode, the red LED latches on. The LED indication must not be used in lieu of the tests specified under Testing. In a freeze trouble condition, the red LED will blink once every 10 seconds (refer to Table 1).

To measure the detector’s sensitivity, the i3 Series Model SENSRDR Infrared Sensitivity Reader tool (see Figure 4) should be used.

Models 2W-B and 2WT-B also include an output that allows an optional Model RA400Z Remote Annunciator to be connected.

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I56-1800-07R

Mounting

Each i3 Series detector is supplied with a mounting base that can be mounted:

1.To a single gang box, or

2.To a 31⁄2-inch or 4-inch octagonal box, or

3.To a 4-inch square box with a plaster ring, or

4.Direct mount or to ceiling using drywall fasteners (Figure 2).

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

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.

•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.

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 connect 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 responding 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 1⁄4-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. NOTE: Style

D initiating circuits require the use of a 2W-MOD for models 2W-B and 2WT-B.

Wiring Diagrams

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

	2-WIRE +				EOL
	ZONE –				RESISTOR
				RA400Z	RA400Z
	2-WIRE	)1(	)4( )3( )2(	)5(	)5( )4( )3( )2( )1(
		IN+	+RA IN/OUT– OUT+	–RA	–RA +RA IN/OUT– OUT+ IN+
	CONTROL
	PANEL
			2W-B or		2W-B or
			2WT-B		2WT-B
					S0133-00

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