Abstract: Hot gas defrosting technology is conducive to energy saving, and more and more light commercial products are beginning to use hot gas defrosting technology to improve energy efficiency. This article proposes a series of solutions to the use of hot gas defrosting compressors that are prone to liquid hammer, overload or even jamming, and proposes a series of solutions such as valve group pressure relief, optimizing elastic pins, limit plates, motors and refrigerating oil, and proposes reliability Operate the SOA area, and conduct targeted reliability tests based on the inflection point of the SOA operating area, which can greatly improve the reliability of the compressor and make the compressor suitable for hot gas defrosting systems.

Key words: Light commercial, Hot air defrosting, Compressor, Reliability, Safe Operating Area region