Patent ID: 8703662

Claim:
A lubricating oil composition/refrigerant combination, comprising a refrigerant, which consists of a C 2 to C 3 unsaturated fluorinated hydrocarbon refrigerant, and a base oil consisting of a polyol ester compound in an amount of at least 50% by mass, wherein the polyol ester compound is obtained from a polyhydric alcohol selected from the group consisting of pentaerythritol, dipentaerythritol, trimethylolpropane and neopentyl glycol, and a C 6 to C 20 aliphatic monocarboxylic acid, wherein said polyol ester compound has an acid value of 0.02 mgKOH/g or less and a hydroxyl value of 5 mgKOH/g or less, wherein the base oil has a kinematic viscosity at 100° C. of 4 to 30 mm 2 /s and a molecular weight of 500 to 3000.