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Carryover is when the refrigerant entering the compressor is not completely vaporized but instead has some entrained liquid refrigerant.One or more problems can result depending on the design of the refrigerant system.
For some systems, high oil concentration in the evaporator promotes foaming and liquid carryover; the carryover introduces liquid refrigerant into the oil separator; liquid refrigerant in the oil separator reduces the separator's effectiveness; reduced separator effectiveness increases the oil concentration of the refrigerant; which in turn further increases the amount of oil in the evaporator; and that ultimately reduces the refrigerant system's efficiency and possible reduces the compressor's supply of oil. Carryover can damage the compressor cause liquid refrigerant is incompressible.
Liquid-gas separators have been developed to address the problem of carryover but create a flow restriction between the evaporator and the compressor.
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