LUBRICATING OIL FOR COMPRESSION REFRIGERATOR AND REFRIGERATING/AIR CONDITIONING APPARATUS USING THE SAME

摘要

PAG having a viscosity of not more than 70 cST (40 DEG C) is added in an amount of 0.1 to 20 % by weight (preferably 2 to 10 % by weight) to a synthetic lubricating oil such as PVE or ester oil to prepare a lubricating agent having good compatibility with both HFC refrigerants and contaminants. Therefore, a refrigerating/air conditioning apparatus provided with a compressor using this lubricating agent together with an HFC refrigerant as a hydraulic fluid neither causes uneven proportion of the mixture in the apparatus nor lowers the effect of cleaning capillary tubes. In this case, no modification of the refrigerating/air conditioning apparatus is required and a highly reliable refrigerating/air conditioning apparatus can be provided at low cost.