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Electrical Myths - Hard Starts Reduce Start Current - Short #156
In this short podcast, Bryan busts the myth that hard starts reduce the start current on the run winding of a compressor.
A single-phase motor's main winding is the run winding; it has a lower resistance and a higher current than the auxiliary winding, also known as the start winding.
Hard start kits are often used on HVAC systems with single-phase compressors (which usually have PSC motors). These kits usually consist of a start capacitor and a potential relay, which takes the start capacitor out of the circuit. We don't typically use hard starts on three-phase motors or ECMs.
Single-phase…
The skinny
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