What is the consequence of returning liquid refrigerant to the crankcase?

Returning liquid refrigerant to the crankcase can risk raising the oil level to a potentially dangerous level. When refrigerant enters the crankcase as a liquid, it can mix with the compressor oil. If too much liquid refrigerant is returned, it can displace the oil, leading to the risk of overfilling the crankcase. This can create problems such as foaming of the oil, which can reduce lubrication efficacy, increase wear on the compressor components, and even result in compressor failure. Proper oil levels are critical for the safe and efficient operation of a compressor, as oil not only lubricates but also helps in sealing and cooling the compressor. Keeping the oil level in check is essential for maintaining system reliability and performance.