Enhanced Safety Logic: Reliable SPST switching prevents ignition if the draft inducer or venting system is obstructed

a reading of "Open" or no beep indicates the fuse has tripped and must be replaced

ensure the flange bolts are tightened in a secondary pattern to approximately 300 lb-in (34 Nm) to ensure a leak-free seal on the gaskets

Precise Signal: Delivers a consistent 20-28 mV open circuit range to ensure reliable safety valve hold-in

making it a suitable upgrade for older 370V systems requiring extra dielectric strength

Trane WHL1278 Wheel Els PW 17895 Enhanced Safety Logic: Reliable SPSTWhen you're dealing with a vibration issue or a complete airflow failure in a Trane air handler, the Trane WHL1278 is the exact OEM replacement blower wheel you need to restore system balance. This is a heavy duty centrifugal fan wheel featuring a 6 1 2" diameter and a 7 5 8" width, specifically engineered for clockwise (CW) rotation. The hub is machined for a standard 1 2 inch bore, ensuring a precise fit on the motor shaft to prevent the "walking"