When diagnosing a 450-degree high limit trip

ensuring original equipment performance and precise fitment

or control board errors that cannot be traced to a single sensor

Use a multimeter at the DC terminals to confirm the desired voltage before connecting your load

While some control modules may have 208/240V inputs

Trane SHE5939 Sheave 322056-301 When diagnosing a 450-degree highWhen you're out in the field servicing a commercial air handler or a belt driven condenser, you need a replacement sheave that holds its settings under load. The Trane SHE5939 is an industrial grade, single groove variable pitch sheave designed for precision airflow balancing and reliable power transmission. Cast from high quality gray cast iron, this 1VP40 model sheave features a 3. 75 inch outside diameter and a 7 8 inch fixed bore with a standard