Unusually heavy frosting or sweating of the suction line of a reciprocating refrigeration compressor indicates a condition which could result in severe damage due to what condition?
β’ Refrigerant condition at the compressor suction (vapor vs. liquid) β’ Effects of liquid refrigerant entering a reciprocating compressor β’ Relationship between frosting/sweating on the suction line and temperature/pressure in that line
β’ Ask yourself what the suction line should normally be carrying into the compressor: superheated vapor, saturated mixture, or liquid? β’ Think about what happens mechanically inside a reciprocating compressor if an incompressible fluid enters the cylinders. β’ Consider which of the listed options would most likely cause the suction line temperature to drop so much that it frosts heavily.
β’ Verify which option involves liquid refrigerant reaching the compressor suction rather than just vapor. β’ Check which conditions would typically show up as low suction line temperature with heavy frost or sweat, versus conditions that primarily affect system capacity or valve performance. β’ Eliminate any choice that does not directly threaten mechanical damage to the compressor internals.
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