What is the formula for checking windings on a compressor?

The formula for checking the windings on a compressor is based on the relationship between the run, start, and common windings, which are crucial for the proper operation of the compressor. The formula RC + SC = RS shows that the resistance of the run winding (RC) added to the resistance of the start winding (SC) equals the resistance of the total winding (RS).

This relationship is important because it confirms the integrity and correct functioning of the windings. If the sum of the run and start winding resistances does not equal the total winding resistance, it may indicate a fault such as a short or an open circuit in the windings. Understanding this formula allows technicians to diagnose issues related to compressor windings effectively, ensuring the compressor operates efficiently and reliably.

The other options reflect different manipulations or incorrect relationships regarding the windings, which do not accurately describe the relationship between the run, start, and common windings in a compressor. Therefore, the first formula is the one that correctly defines how to assess the windings' health.