This unit serves as the R40638-001 direct replacement

this kit contains the internal pressure change mechanism only

Streamlined Integration: Features standard thermocouple connectors for rapid field replacement and minimal downtime

Quiet Operation: Designed to minimize harmonic noise and provide smooth ramp-up cycles

OEM Compatibility: Guaranteed fit for Carrier 356066-0801 to maintain factory specifications

Trane SEN1809 Temp Sensor 319848-301 This unit serves as theWhen you're troubleshooting a lockout or erratic discharge air temperature on a Trane or American Standard unit, a failing thermistor is often the culprit. The Trane SEN1809 is a genuine OEM thermistor temperature sensor designed specifically for a 3 4" tube mount. This NTC (Negative Temperature Coefficient) sensor provides high accuracy resistance feedback to the control board, ensuring the system maintains precise setpoints and avoids coil freeze