System Sensor i3 series

i³ series

Manufacturer	System Sensor {"label": "Manufacturer", "field": "System Sensor"}
Rated Voltage	8.5-35 VDC {"label": "Rated Voltage", "field": "8.5-35 VDC"}
Introduced	2001 {"label": "Introduced", "field": "2001"}
Preceded by	System Sensor 100 series System Sensor 400 series {"label": "Preceded by", "field": "System Sensor 100 series System Sensor 400 series"}

{
    "rows": [],
    "title": "i<sup>3</sup> series",
    "images": [
        "System Sensor i3.webp"
    ]
}

The System Sensor i³ series is a series of conventional detectors.

History

The i³ series was introduced in 2001 as a replacement for the standard 100 series Direct-Wire smoke detectors. The original series consisted of the 2W-B, 2WT-B, 4W-B, and 4WT-B detectors, as well as the 2W-MOD interface required for 2-wire detectors on existing panels; the 2W-MOD had a similar design to the 500 series modules. The Fire-Lite MS-2 and MS-4 were also introduced at this time with integrated i³ protocol support, removing the need for the 2W-MOD on these panels.

In 2002, System Sensor introduced sounder and relay models to replace the specialty 100 series Direct-Wire detectors. The 2W-MOD was not compatible with the 2WTA-B and 2WTR-B, so the 2W-MOD2 was released as a replacement.

Around 2014, the MOD2W was introduced as a successor to the 2W-MOD2 with a similar design to the i⁴ modules.

Standard i3 Mounting Plate

Operation

The detector is microprocessor based. The i³ protocol supported by a select amount of Honeywell panels allows for usage of the MAINTENANCE light to indicate certain faults with the detector on a normal conventional zone. Faults that fall under maintenance include operating out of it's temperature range (Overheat at 135F, freezing at 41F), and the detector falling out of sensitivity which indicates the requirement for cleaning.

On two-wire i³s, the detector is put in alarm by reversing the poles. This means you will need a panel that supports this. An i³ loop test/maintenance module can be used otherwise. DO NOT power it with batteries. This will result in frying the detector.

This table lists the operation modes of the i³.

An i³ head with dust cover

i³ LED Status Modes

Mode	Green LED	Red LED
Detector Power-Up	Blink 10 Seconds	Blink 10 Seconds
Normal Operation	Blink 5 Seconds
Alarm		Solid
Freeze Trouble		Blink 10 Seconds
Out of Sensitivity		Blink 5 Seconds

Models

Model	Wiring	Type	Relay?	Horn?	Replaced
2W-B	2-wire	Photoelectric	No	No	1400 2100S 2400
2WT-B	2-wire	Photoelectric with thermal	No	No	2100TS 2112/24TSRB (with 2W-MOD) 2400TH 2451TH
2WTA-B	2-wire	Photoelectric with thermal	No	Yes	2100AT
2WTR-B	2-wire	Photoelectric with thermal	Yes	No	2100TR
4W-B	4-wire	Photoelectric	No	No	1412B 1424 2112/24S
4WT-B	4-wire	Photoelectric with thermal	No	No	2112/24TS 2451TH
4WTA-B	4-wire	Photoelectric with thermal	No	Yes	2112/24AT
4WTR-B	4-wire	Photoelectric with thermal	Yes	No	1412B 1424 2112/24R 2112/24TR 2412B 2412THB 2424 2424TH
4WTAR-B	4-wire	Photoelectric with thermal	Yes	Yes	2112/24ATR
4WITAR-B	4-wire	Thermal with isolated local photoelectric alarm	Yes	Yes	2112/24AITR

Accessories

2-wire interface modules

MOD2W

The 2-wire interface modules (2W-MOD, 2W-MOD2, and MOD2W) act as sub controllers for i3 detectors. They can be used for panels that don't support i³s or two wire detectors. It supports the EZ WALK TEST feature of the i³ and has 4 indicator lights to annunciate normal activity, walk test indication, wiring faults, smoke sensitivity plus freeze faults, smoke and CO alarms. A trouble relay is provided for the maintenance faults as with a 24V resettable power input, and alarm. Class A is supported.

SENS-RDR

SENS-RDR

A sensitivity reader tool to measure sensitivity on the i3 detectors, plus the 2151 & 2151T 100 series detectors made after April 2006. It is an infared optical interface that reads the sensitivity & status data automatically shot by the detector every ten seconds. Depending on circumstances the reader will display "GOOD", "SERVICE", and "REPLACE".

RRS-MOD

The RRS-MOD reversing relay/synchronization module helps enable the sounder equipped on select i3s as if they were a part of the actual alarm system. This is done by tying it to the NAC circuit.

RT

Specialized removal tool for i3 detectors.

A77-AB2

A 4WTAR-B with the A77-AB2 Retrofit Adapter

"i3 Retrofit Adapter Ring" - This is essentially a lower profile mounting plate for the i3. usually used when retrofitting where a larger smoke detector once was.

Rebrands

Faraday

Faraday briefly rebranded the standard i³ devices as part of the 8400 series until 2004.

DMP

DMP rebrands the i3 detectors as their own addressable models (2W‑BLX, 2WT‑BLX) for the 12V LX-BUS addressable protocol. Detector heads have a DMP sticker put on top of the normal System Sensor one noting no physical difference outside of that, but the detector bases include a DMP monitor module sandwiched in between the screw terminals. Of note is that techs frequently remove this monitor as to make the detector onto a conventional zone rather.

Monaco

Monaco model	System Sensor model	Replaced	Replaced by
723-340-00	2W-B		Still in production
723-340-01	2WT-B		Still in production
723-508-00	4W-B		Still in production
723-508-01	4WT-B		Still in production

Honeywell/Resideo

Honeywell/Resideo produces the 5193 series V-Plex Addressable smoke detectors which are basically addressable i3 detectors. They are meant for the Honeywell Vista Series of addressable Burg/Fire panels. These detectors lack dials to set address and are programmed through the panel.