Refrigerant in the oil will cause oil _______ at start-up.

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Multiple Choice

Refrigerant in the oil will cause oil _______ at start-up.

Foaming is the result you’d expect when refrigerant is in the oil. At start-up, the refrigerant tends to exsolve from the oil and form gas bubbles, creating a foamy mixture. This foam disrupts the oil’s ability to form a stable lubricating film, which can increase wear during initial operation. The other effects don’t fit this scenario: thinning would imply a simple drop in viscosity without foam, gelling means the oil would thicken into a gel, and sludging refers to solid or sludge formation from contaminants—none of which describe the foamy, bubbly condition caused by refrigerant in the oil.

Foaming is the result you’d expect when refrigerant is in the oil. At start-up, the refrigerant tends to exsolve from the oil and form gas bubbles, creating a foamy mixture. This foam disrupts the oil’s ability to form a stable lubricating film, which can increase wear during initial operation.

The other effects don’t fit this scenario: thinning would imply a simple drop in viscosity without foam, gelling means the oil would thicken into a gel, and sludging refers to solid or sludge formation from contaminants—none of which describe the foamy, bubbly condition caused by refrigerant in the oil.

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