Daikin-McQuay 5009496 Thermistor Assembly

The Daikin-McQuay 5009496 Thermistor Assembly is a high-precision NTC (Negative Temperature Coefficient) sensor designed for critical monitoring in light commercial and industrial HVACR platforms. This OEM replacement part is engineered to deliver a specific resistance-to-temperature curve, ensuring the controller receives accurate data for discharge air, liquid line, or ambient temperature sensing. By maintaining tight tolerances at the R25 reference point, this assembly prevents common issues such as short-cycling, improper expansion valve hunting, or inaccurate freeze protection alerts.

Constructed with a rugged, moisture-resistant probe tip, the 5009496 sensor is built to withstand the thermal cycling and vibration typical of Daikin and McQuay packaged units and chiller systems. This HVAC thermistor assembly allows for seamless integration with existing control boards, eliminating the need for field calibration. When troubleshooting sensor error codes or hunting for "drift" in your system’s performance, replacing a compromised thermistor with this genuine thermistor assembly 5009496 restores original equipment efficiency and system logic staging.

Key Benefits

• Precision Resistance Mapping: Matches original equipment curves to prevent temperature sensing offsets and controller errors.
• OEM Reliability: Direct replacement for Daikin-McQuay parts, ensuring physical fit and electrical compatibility with factory wiring harnesses.
• Fast Thermal Response: Optimized thermal time constant for rapid detection of temperature fluctuations in air or fluid streams.
• Enhanced Durability: Robust lead-wire insulation and probe encapsulation protect against environmental ingress and electrical noise interference.

Common Questions

How do I test the Daikin 5009496 thermistor for accuracy?
Using a calibrated multimeter, measure the resistance across the leads at a known temperature (typically 77°F/25°C). Compare the k-ohm reading against the Daikin thermistor resistance chart to verify if the sensor has drifted out of its specified tolerance range.

Can I use an aftermarket generic 10k thermistor instead of the 5009496?
It is not recommended. While many HVAC sensors use a 10k-ohm base, the specific Beta constant and curve slope for Daikin 5009496 are unique to its control logic. Using a non-matching sensor will result in inaccurate readings and suboptimal system performance.

What are the signs that this thermistor assembly needs replacement?
Common indicators include active fault codes (such as sensor open/short errors), irregular compressor staging, or the unit failing to transition into defrost or economizer modes due to false temperature data.

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.