Which operational problem is caused when refrigerants accumulate excessive oil within an evaporator core?

💡 Explanation

When excessive oil accumulates in the evaporator core of a refrigeration system, it coats the internal surfaces because of its higher viscosity, impeding heat transfer and reducing the available surface area for refrigerant evaporation. Therefore a reduced cooling capacity results, rather than motor overheating, increased pressure or icing which result from different faults.

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