What is one consequence of high crankcase temperature in a refrigeration unit?

High crankcase temperature in a refrigeration unit can lead to a higher risk of oil breakdown. Refrigeration systems rely on lubricating oil to ensure that the moving parts, particularly in the compressor, operate smoothly and without excessive wear. When the crankcase temperature rises significantly, it can alter the chemical composition of the oil, leading to oxidation, degradation, and the formation of sludge or varnish. This breakdown can compromise the oil’s ability to lubricate effectively, potentially resulting in increased friction and wear on compressor components, reduced efficiency, and ultimately, a shorter lifespan for the compressor.

The other choices do not accurately reflect the effects of high crankcase temperature. For instance, increased energy efficiency and improved compressor lifespan would be counterintuitive outcomes, as high temperatures typically lead to additional stress and inefficiencies within the system. Lower system pressure can also be a symptom of other issues in the refrigeration cycle but is not directly linked to high crankcase temperature. Therefore, the most direct and relevant consequence is the increased risk of oil breakdown.