If a refrigeration compressor crankcase is sweating or frosting and this is accompanied by unsusual noises coming from the compressor, what is most likely the cause?
β’ Behavior of a refrigeration compressor when liquid refrigerant returns to it (liquid slugging) β’ What happens to the crankcase temperature and appearance when liquid refrigerant or excess refrigerant reaches it β’ How an expansion valve that is not regulating properly affects evaporator and compressor conditions
β’ Which choice would allow too much refrigerant (possibly in liquid form) to leave the evaporator and reach the compressor crankcase? β’ What condition around the compressor crankcase would cause sweating or frosting β higher heat or very low temperatures? β’ Which options describe relatively mild or normal conditions, and which describe a fault serious enough to cause unusual noises in the compressor?
β’ Compare which option could lead to liquid refrigerant entering the compressor, causing noise and crankcase frosting β’ Decide whether excessive superheat would make the compressor colder or hotter at the crankcase β’ Ask yourself if normal oil circulation or a small amount of air in the system would usually cause loud, unusual noises and visible frosting at the compressor
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