REFRIGERANT OIL COMPOSITION FOR PACKAGE AIR CONDITIONER

摘要

PPROBLEM TO BE SOLVED: To provide a refrigerant oil composition that can achieve a high-level balance of all the properties including stability against air and moisture, compatibility with the coolant, oil returning properties and lubricity, and can stably operate package air conditioners using an HFC coolant or the like for a long time. PSOLUTION: This refrigerant oil composition for package air conditioners comprises a basic oil mixture of a tetra ester of pentaerythritol and a fatty acid, and a diester of neopentyl glycol and a fatty acid; a phosphorothionate; a phosphorus-type additive other than the phosphorothionate; and a glycidyl ester-type epoxy compound. PCOPYRIGHT: (C)2006,JPO&NCIPI