Carrier HH79NZ029 Thermistor Sensor

The Carrier HH79NZ029 Thermistor Sensor is a high-precision 5k Ohm water temperature sensor designed for critical monitoring in industrial chillers, air handlers, and packaged units. This 4-inch thermistor provides the essential feedback loop required for accurate saturated suction temperature and fluid thermal monitoring, ensuring your HVAC control system maintains optimal setpoints. As a factory-authorized part, it guarantees seamless integration with Carrier 30GT series and other high-end chillers where low-tolerance resistance is mandatory for refrigerant temperature sensing.

When troubleshooting HVAC sensor errors or erratic discharge air readings, installing an OEM thermistor replacement like the HH79NZ029 eliminates the calibration drift often found in universal components. The thermistor resistance-temperature curve of this unit is specifically matched to Carrier’s internal logic, allowing for rapid response times of approximately 0.2 seconds. This level of precision is vital for building automation systems (BAS) and chiller plant optimization, where even a slight deviation can lead to inefficient compressor cycling or freeze-up conditions. Its robust, moisture-resistant housing is engineered to withstand the thermal cycling typical of commercial HVAC applications.

• 5k Ohm Precision: Delivers high-accuracy resistance-to-temperature conversion for HVAC diagnostics and reliable system feedback.
• Optimized for Water & Refrigerant: Specifically designed as a water temperature sensor for boilers, chillers, and fluid monitoring in refrigerant suction lines.
• Rapid Response: Features a high-sensitivity element that reacts to thermal shifts in just 0.2 seconds, preventing HVAC equipment lag and overshoot.
• Durable 4-Inch Probe: The 4-inch sensor length ensures deep immersion in sensor wells for better thermal contact and more accurate core readings.

• What are the symptoms of a failing HH79NZ029 sensor? Common indicators include erratic temperature displays on the HVAC controller, "Sensor Out of Range" alarms (such as AL909 or AL910), and unexpected compressor staging or shutdowns.
• Is this compatible with non-Carrier equipment? While optimized for Carrier, Bryant, and Payne chillers like the 30GT-210-510, it can be used in any 5k Ohm thermistor circuit requiring a 4-inch probe, provided the resistance curve matches the controller's requirements.
• How do I verify the sensor's health? Use a multimeter to perform an ohm check at the back of the controller pins; a reading significantly outside the standard 5k Ohm range at 25°C (77°F) indicates a failed or drifted sensor.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.