Description The HD202B Addressable Heat Detector is an intelligent fire detection device designed to deliver fast and reliable heat sensing in addressable fire alarm systems. It utilizes a state-of-the-art thermistor sensing circuit to ensure rapid response to temperature changes, making it ideal for environments where smoke detection may not be suitable. This detector provides open-area protection with up to 50 ft spacing capability and operates as a rate-of-rise heat detector with a fixed temperature alarm threshold of 135°F (57°C). Each detector’s unique address is securely stored in the MCU’s EEPROM and can be easily programmed using a portable address-setting device. Equipped with dual high-visibility LEDs, the HD202B offers 360° visual indication of device status. The LEDs can be latched ON by command from the fire alarm control panel during alarm conditions or unlatched automatically when normal conditions are restored. The HD202B requires compatible addressable communication protocols and must be connected only to listed, compatible fire alarm control panels. It is suitable for commercial, industrial, and residential fire safety applications. Specifications Detector Type: Addressable Heat Detector Model: HD202B Sensing Method: Thermistor-based heat sensing Alarm Type: Rate-of-Rise Fixed Temperature: 135°F (57°C) Coverage Area: Open-area protection up to 50 ft spacing Height: 2.2 in (55 mm) installed in base Diameter: 4.0 in (103 mm) Weight: 5.5 oz (155 g) Operating Temperature Range: 14°F to 122°F (-10°C to +50°C) Operating Humidity Range: 10% to 93% RH (Non-condensing) Addressing Method: EEPROM-stored, programmable via portable address setting device LED Indicators: Dual LEDs with 360° visibility, panel-controlled Mounting Type: Plug-in Compatibility: Listed addressable fire alarm control panels only Application: Commercial, industrial, and residential installations