Fire-Lite H365HT High-Temperature Heat Detector

The Fire-Lite H365HT High-Temperature Heat Detector is an intelligent addressable thermal detector designed for compatible Fire-Lite fire alarm control panels. It uses thermistor-based sensing technology and provides a 190°F (88°C) fixed-temperature alarm threshold for applications requiring a higher operating temperature than standard 135°F heat detectors.

The H365HT is part of Fire-Lite’s H365 Series and uses LiteSpeed communication, rotary decimal addressing, and individual Point ID identification. It is also a direct replacement-family successor to the older H355 Series.

Product Functions

• Provides intelligent addressable heat detection
• High-temperature fixed-thermal operation
• 190°F / 88°C alarm threshold
• Uses thermistor sensing technology
• Supports LiteSpeed communication
• Uses rotary decimal addressing
• Provides individual Point ID identification
• Uses a two-wire SLC connection
• Provides two visible status LEDs
• Supports remote testing from the control panel
• Supports local magnetic functional testing
• Includes built-in device-type identification
• Includes tamper-resistant capability
• Uses interchangeable detector bases

190°F High-Temperature Detection

The H365HT is specifically designed as a high-temperature fixed thermal detector.

Its factory-set alarm threshold is:

190°F

88°C

Unlike the H365R, the H365HT does not rely on rate-of-rise operation. It responds when the monitored temperature reaches its fixed high-temperature threshold.

This makes it useful for environments where normal ambient temperatures may be too high for a conventional 135°F detector.

Thermistor Technology

The H365HT uses advanced thermistor sensing technology for fast and reliable temperature measurement.

The electronic thermal sensor continuously monitors conditions while the detector’s integral communication electronics report device status to the compatible Fire-Lite control panel.

This provides intelligent thermal detection without relying on traditional mechanical heat-sensing elements.

LiteSpeed Communication

The standard white H365HT operates using:

LiteSpeed Protocol

The related:

H365HT-IV

is the ivory version that supports both CLIP and LiteSpeed communication.

This distinction is important when selecting a replacement detector for older Fire-Lite systems that require CLIP compatibility.

Addressable Point Identification

The H365HT uses rotary decimal address switches to establish its individual SLC address.

This allows the fire alarm control panel to identify the exact detector reporting an alarm or other condition rather than identifying only a conventional detection zone.

Each H365 Series detector occupies one address on the compatible Fire-Lite signaling line circuit.

LED Status Indication

The H365HT incorporates two visible LEDs providing a 360-degree viewing angle.

Typical operation is:

Normal: LEDs blink red when polled

Alarm: LEDs illuminate steady red

This provides local visual confirmation of communication and alarm status.

Remote & Magnetic Testing

The detector supports a remote test function from the fire alarm control panel.

It also incorporates a built-in functional test switch that can be activated using an external magnet.

These features simplify routine functional testing and system commissioning without requiring the detector to be exposed to actual high temperatures during every test.

Detector Base Compatibility

The H365HT is a plug-in detector that uses a separate compatible Fire-Lite/System Sensor base.

Compatible configurations include standard detector bases as well as applicable relay, isolator, and sounder bases.

The separate base architecture allows the detector head to be removed for servicing or replacement without disturbing the field wiring.

Electrical & Detection Information

Detector Type: Intelligent High-Temperature Heat Detector

Temperature Rating: 190°F / 88°C

Communication: LiteSpeed

Addressing: Rotary decimal

SLC: Two-wire

Status Indicators: Dual LEDs

Testing: Panel remote test / magnetic local test

Color: White

Base: Separate, compatible detector base

Exact SLC voltage, standby current, and loop capacity should be calculated using the applicable Fire-Lite panel and detector documentation.

Product Status

Honeywell currently identifies the H365 Series as discontinued. The H365HT remains documented in Fire-Lite compatibility information for existing systems.

For replacement applications, compatibility with the installed control panel, SLC protocol, detector base, and panel firmware should be confirmed before selecting a current replacement.

H365HT Datasheet