Refrigeration apparatus and lubricating oil composition

A compressor for a refrigerating apparatus, wherein said compressor is sealed and contains an HFC refrigerant and refrigerant oil compatible with the HFC refrigerant, characterized in that:

• said refrigerant oil contains as base oil components a polyol-ester oil formed by reacting a fatty acid with pentaerythritol (PET), to which are added 0.1% to 2.0% by weight of tricresylphosphate (TCP), 0.01% to 10% by weight of carbodiimide, and 0.01% to 1.0% by weight of a phenol oxidation prevention agent;
• and
• said compressor is a rotary compressor comprising a roller made of an iron material and a vane made of an iron material surface-treated with chromium nitride.

A compressor for a refrigerating apparatus, wherein said compressor is sealed and contains an HFC refrigerant and refrigerator oil compatible with the HFC refrigerant, characterized in that:

• said refrigerator oil contains as base oil components a polyol-ester oil formed by reacting a fatty acid with a polyhydric alcohol selected from Pentaerythritol (PET), trimethylolpropane (TMP) or neopentylglycol (NPG), to which are added 0.1% to 2.0% by weight of tricresylphosphate (TCP) and 0.01% to 10% by weight of an epoxy compound, wherein the epoxy compound comprises glycidyl ether or 0.01% to 10% by weight of carbodiimide;
• and
• wherein said compressor is a reciprocating compressor comprising piston/cylinder, rotary shaft/bearing combinations made of a material selected from composite materials of aluminum and carbon, or iron materials surface-treated with chromium nitride.