Honeywell ATD-L3R-IV Intelligent Heat Detector

The Honeywell ATD-L3R-IV Intelligent Heat Detector is an addressable thermal detector designed for compatible Honeywell/Gamewell-FCI fire alarm systems. It combines a 135°F fixed-temperature threshold with rate-of-rise detection, providing both temperature-limit and rapid-temperature-change detection.

The ivory -IV configuration supports both Velociti and CLIP protocols, making it suitable for compatible current and legacy addressable systems. Honeywell’s current Series 3 documentation specifically identifies ATD-L3R-IV as the ivory 135°F rate-of-rise model.

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Product Functions

• Provides intelligent addressable heat detection
• Provides 135°F fixed-temperature detection
• Provides rate-of-rise heat detection
• Detects rapid temperature increases
• Supports Velociti communication
• Supports CLIP communication
• Uses rotary device addressing
• Provides individual point identification
• Continuously monitors temperature
• Communicates detector status to the fire alarm control panel
• Uses compatible interchangeable detector bases
• Designed for compatible Gamewell-FCI intelligent systems

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135°F Fixed-Temperature Detection

The ATD-L3R-IV has a fixed-temperature alarm rating of:

135°F / approximately 57°C.

When the monitored temperature reaches the detector’s fixed threshold, the device communicates the alarm condition to the compatible fire alarm control panel.

This provides thermal fire detection in areas where smoke detection may be inappropriate or where heat detection is required by the system design.

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Rate-of-Rise Detection

In addition to its fixed-temperature threshold, the ATD-L3R-IV incorporates rate-of-rise detection.

Published Honeywell engineering specifications identify the rate-of-rise element at approximately:

15°F per minute

or roughly:

9.4°C per minute.

This allows the detector to respond to a rapidly developing fire before the ambient temperature necessarily reaches the 135°F fixed-temperature threshold.

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Intelligent Addressable Operation

The ATD-L3R-IV is an intelligent addressable detector.

Each detector communicates individually with the compatible fire alarm control panel, allowing the system to identify the exact detector reporting an alarm or abnormal condition.

The detector continuously monitors temperature and communicates its condition through the signaling line circuit rather than relying on a conventional standalone alarm contact.

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Velociti & CLIP Communication

Honeywell identifies the ATD-L3R-IV as supporting:

Velociti

and

CLIP communication.

This is an important characteristic of the ivory model.

Honeywell’s ordering information distinguishes:

ATD-L3R: Bright white, Velociti

ATD-L3R-IV: Ivory, Velociti/CLIP.

CLIP compatibility provides additional flexibility for use with compatible legacy fire alarm systems.

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Rotary Addressing

The ATD-L3R-IV provides individual point identification using rotary address switches.

Each detector is assigned its own address so the fire alarm control panel can associate an alarm or trouble condition with a specific physical detector location.

This simplifies system annunciation, testing, troubleshooting, and maintenance compared with conventional zone-based heat detection.

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Detector Base Compatibility

The ATD-L3R-IV is compatible with multiple Honeywell/System Sensor detector bases. Honeywell’s compatibility documentation identifies support for base configurations including:

B501-IV

B300-6-IV

B200S-IV / B200S-LF-IV

B200SR-IV / B200SR-LF-IV

B224BI-IV

B224RB-IV.

These options allow the detector to be used with standard, sounder, isolator, and relay-base applications where supported by the fire alarm system.

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Related ATD-L3 Models

Honeywell’s Series 3 thermal detector family includes:

ATD-L3: 135°F fixed-temperature, bright white

ATD-L3-IV: 135°F fixed-temperature, ivory, Velociti/CLIP

ATD-L3R: 135°F fixed-temperature with rate-of-rise, bright white

ATD-L3R-IV: 135°F fixed-temperature with rate-of-rise, ivory, Velociti/CLIP

ATD-L3H: 190°F high-temperature, bright white

ATD-L3H-IV: 190°F high-temperature, ivory, Velociti/CLIP.

The ATD-L3R-IV is therefore specifically the ivory, dual fixed-temperature/rate-of-rise version.

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Electrical & Communication Information

Detector Type: Intelligent thermal detector

Fixed Temperature: 135°F / approximately 57°C

Rate-of-Rise: Approximately 15°F/min

Communication: Velociti / CLIP

Addressable: Yes

Connection: Two-wire signaling line circuit

Color: Ivory.

Exact loop voltage, current consumption, device capacity, and wiring limitations should be calculated using the compatible fire alarm control panel and Honeywell Series 3 documentation.

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Installation Information

The ATD-L3R-IV installs onto a compatible intelligent detector base. The address is set using the detector’s rotary address switches before the detector is placed into service.

Typical installation includes installing and wiring the appropriate detector base, setting the device address, attaching the detector, programming the point into the fire alarm control panel, verifying communication, and functionally testing both alarm reporting and thermal response.

The detector connects to the compatible fire alarm control panel through a two-wire signaling line circuit.

ATD-L3R-IV Datasheet