Aaon R81550 Temperature Sensor

The Aaon R81550 Outside Air Temperature Sensor is a critical component for maintaining accurate environmental monitoring and HVAC system efficiency. Designed specifically for integration with Aaon rooftop units and air handlers, this thermistor-based sensor provides precise ambient air readings to the controller, ensuring proper economizer operation and lockout setpoints. This sensor is engineered to withstand harsh exterior conditions, preventing signal drift that often leads to short-cycling or improper outdoor air intake. For contractors performing commercial HVAC maintenance, the R81550 is a direct OEM replacement that ensures seamless communication with Aaon controls without the calibration errors associated with generic alternatives. Correct placement and wiring of this ambient air sensor are vital for optimizing building automation system (BAS) performance and protecting compressors during low-ambient cooling scenarios. Reliable and durable, it is the standard for technicians who prioritize accurate enthalpy control and long-term system stability.

• Precision Resistance: Engineered for accurate temperature-to-resistance mapping, ensuring your Aaon controller receives exact ambient data.
• OEM Compatibility: Guaranteed fit and electrical synchronization with Aaon R81550 specifications, reducing troubleshooting time.
• Weather-Resistant Housing: Built to endure extreme temperature fluctuations, UV exposure, and moisture for consistent outside air temperature tracking.
• System Optimization: Essential for the correct execution of economizer cycles and demand-controlled ventilation strategies.

Common Questions

How do I test the Aaon R81550 for accuracy?
Technicians should use a multimeter to check the thermistor resistance against the manufacturer’s temperature-resistance chart. Disconnect the sensor from the controller before measuring to avoid back-feeding voltage.

Can this sensor be used for supply air sensing?
While the resistance curve may be similar, the R81550 is specifically designed as an outside air temperature sensor. Always verify the part number against your unit’s wiring diagram to ensure proper application.

Why is my economizer not opening despite favorable outdoor conditions?
A failed ambient sensor often sends a default or "out of range" signal to the BAS, causing the controller to lock out the economizer for system protection. Replacing a drifted R81550 typically restores functionality.

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.