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COSMO-2W - Honeywell System Sensor i4 Hardwired 2-Wire Smoke and Carbon Monoxide Detector

COSMO-2W - Honeywell System Sensor i4 Hardwired 2-Wire Smoke and Carbon Monoxide Detector
COSMO-2W - Honeywell System Sensor i4 Hardwired 2-Wire Smoke and Carbon Monoxide Detector
Item# COSMO-2W

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List Price: $226.86
Special Order: $151.24
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Please Note: The System Sensor COSMO-2W hardwired 2-wire smoke/carbon monoxide detector is a special order item.

Honeywell Home COSMO-2W Product Description:


The Honeywell System Sensor COSMO-2W is a i4-Series combination, two-wire, photoelectric carbon monoxide (CO) and smoke detector. The COSMO-2W features the best-in-class dual-combination CO and smoke detection technology in a single, system-connected device.

The COSMO-2W i4-Series combines CO and smoke detection into one device, requiring less wiring and fewer back boxes than two separate devices. The i4-Series is compatible with i3 (2WTA-B or 4WTA-B), so an attractive CO monitoring solution can easily be retrofitted into existing i3 installations. The i4-Series CO cell can be easily replaced at end-of-life, resulting in a much lower life cost than having to replace the entire detector.

The COSMO-2W i4-Series Combination CO/Smoke detector requires less wiring than two separate CO and smoke devices. DIYer's can pre-wire its plug-in base, while its large wire-entry port and in-line terminals provide ample room for neatly routing wiring. The base accommodates several back box options and also direct mounts using drywall anchors. The i4 head plugs into the base with a simple Stop-Drop 'N Lock™ action. When the detector's CO cell reaches end-of-life, it can be easily replaced in the field without a tool.

With the help of the module, the COSMO-2W i4-Series transmits distinct CO and smoke signals, allowing appropriate response from the central monitoring station. Intelligent features, such as drift compensation and smoothing algorithms, reduce nuisance alarms.The COSMO-2W LED's enable instant inspection of detector status signaling normal/standby condition, alarm condition, maintenance/trouble condition or functional test mode. 2-wire devices allow loop testing via the EZ Walk feature where wiring can easily be verified by checking the LED status at each detector.

Smoke sensitivity can be easily measured using the wireless SENS-RDR device. CO cell functionality can also be quickly validated in the field with canned CO per NFPA 720: 2009 requirements using the detector's RealTest functionality.

Product Features:

  • Single device for CO and smoke detection that uses less wiring and fewer junction boxes
  • Compatible with a wide range of control panels with the use of the required i4 Interface Module
  • Sends distinct smoke and CO signals to the panel
  • Sounds Temporal 3 for smoke and Temporal 4 for CO
  • Built-in 85dB sounder
  • LEDs display both CO and smoke status
  • External IR LED provides extended range sensitivity testing
  • Versatile mounting allows for wall or ceiling placement
  • Easily replaceable electrochemical CO cell with 6-year end-of-life timer that signals the panel and chirps to alert the homeowner
  • RealTest® enables functional test using canned CO
  • Drift compensation and smoothing algorithms provide false alarm immunity
  • Compatible with SENS-RDR sensitivity tester
  • Full agency compliance with UL 268 and UL 2075

Honeywell Home COSMO-2W Product Specifications:


  • Dimensions: Diameter: 5.5"; Depth: 2.5" (includes base)
  • Operating Temperature Range: 32°F to 122°F (0°C to 50°C)
  • Storage Temperature Range: -10 70° C (14 158° F)
  • Operating Relative Humidity: 20-95% RH
  • Operating Voltage: Nominal: 12/24V non-polarized | Minimum: 8.5V | Maximum: 35V
  • Maximum Standby Current: 50 µA
  • Maximum Alarm Current: 2-Wire 50mA; 4-Wire 40mA
  • Audible Signal: 85 dBA
  • Maximum Reverse Polarity Current: 20 mA
  • Maximum Start-up Current: 200µA
  • Maximum Start-up Capacitance: 10 µF
  • Weight: 9.2 oz. (261 g)
  • Sensitivity: 2.5%/ft nominal
  • Input Terminals: 14 to 22 AWG
  • Mounting: 3½-inch octagonal back box | 4-inch octagonal back box | Single-gang back box | 4-inch square back box with a plaster ring | Direct mount to ceiling

Honeywell Home COSMO-2W Product Compatibility:


• Hardwired Control Panels (works universally across brands)*

* Depends upon the power availability of the control panel "brains" of the security system.

Product Reviews

Other customers rated this item:
5 out of 5 stars
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  Quick replacement,
Posted By:

We?re doing a whole house remodel so it was a perfect time for new smoke detectors. I like that they are powered by house power with a battery backup. I like that they?re linked and have voice alerts. The backup battery is easy to get to when they need replacing. Thanks



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  Most Valuable for Your Home,
Posted By:

This is very awesome, easy to install, inexpensive, and doesn?t stick out.



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  Easy to install. No false alarms.,
Posted By:

This is our favorite fire alarm. We bought this for a cabin bunkhouse which is required by the county for sleeping areas. It doesn?t have to be hardwired but we chose to do so since an electrician was doing the main wiring for the bunkhouse. It looks nice and had a reasonable price. It also came the next day!



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  It's perfect, no issues at all.,
Posted By:
1 people found this review helpful

Luckily bought this Smoke & Carbon monoxide all in one unit at a special discount and it fits nicely over the existing hole and the provided mount is designed very well. Highly recommend.



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