System Sensor 4WT-B Mounting of Detector, Tamper-ResistantFeature, Wiring Installation Guidelines

Figure 1: Mounting of Detector

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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 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.

Wiring Diagrams

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

SNAP OFF TAB

FOR TAMPER LOCK

TAMPER

RELEASE TAB

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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

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D100-96-00 2 I56-1800-08R