The Aaon P87140 Duct Temperature Sensor is a precision HVAC thermistor designed for high-accuracy air temperature monitoring in HVACR control systems. This 10k ohm Type II thermistor is the direct replacement for the Aaon OE231 temperature sensor, ensuring seamless integration with legacy Aaon rooftop units and heat pump systems. Built for durability in high-airflow environments, the P87140 sensor provides stable resistance output to the main controller, allowing for precise discharge air temperature monitoring and efficient staging of heating or cooling cycles. Its standardized resistance curve facilitates straightforward calibration and troubleshooting for technicians managing commercial HVAC maintenance. By delivering real-time data to the DDC control system, this sensor helps prevent coil icing and ensures the unit operates within specified setpoints. Whether performing a routine HVAC sensor replacement or diagnosing airflow issues, the P87140 serves as a reliable OEM-spec component that maintains system equilibrium and prevents unnecessary compressor cycling in demanding commercial applications. Key Benefits for Technicians Direct OEM Interchange: Fully compatible and identical to the Aaon OE231, eliminating the need for field modifications or bracket fabrication. High-Accuracy Thermistor: Utilizes a 10k Type II curve to provide consistent resistive temperature device (RTD) data for precise environmental control. Rugged Probe Design: Engineered to withstand standard duct velocities and moisture levels found in packaged HVAC units. Streamlined Installation: Features standard wiring leads for fast termination within the control cabinet or terminal block. Common Maintenance Questions Is the P87140 compatible with non-Aaon control boards? While designed as an Aaon replacement part, this sensor utilizes a standard 10k-ohm Type II thermistor curve. It may function with other controllers, but we recommend verifying the resistance-to-temperature chart requirements of your specific DDC system. What are the symptoms of a failing duct temperature sensor? Common indicators include erratic compressor staging, "out of range" alarms on the controller, or incorrect discharge air temperature readings that do not match manual probe measurements. Can the P87140 be used for both supply and return air sensing? Yes, the P87140 duct sensor is versatile enough to monitor either supply or return air streams, provided the mounting location allows for representative airflow exposure. 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.
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