Trane WHL2170 Wheel 319825 402 technicians can perform an operational technicians can perform an operational test using an SD MAG test magnet on the sensor module or via a remote test reset station wired to the controller’s interface terminals the System Sensor 2W B ensures long term reliability in commercial and residential applications Replacing a warped or unbalanced wheel with this genuine OEM part restores laminar airflow and eliminates the vibration that can lead to premature motor bearing failure or noisy operation OEM Airflow Balance: Restores factory spec indoor air quality (IAQ) and system capacity by maintaining the intended CFM across the evaporator coil