• Nu-Calgon naphthenic mineral oil is available in three grades: C-3s (150 SUS), C-4s (300 SUS) and C-5s (500 SUS). All viscosities are manufactured by Calumet Lubricant Co. and are approved by Copeland, Trane and other compressor manufacturers, approvals varying by viscosity. • They are specifically designed for today’s high performance air conditioning and refrigeration compressors. These modern compressors run at higher speeds and generate higher temperatures, and they need better lubrication. • Use of C-3s, C-4s, and C-5s mineral oil will insure continued efficient system operation, providing the important properties required from a good refrigeration oil. Nu-Calgon mineral oils combine excellent solubility and stability with good floc and pour points to provide excellent low temperature performance. • The basic purpose of refrigeration oil is to lubricate the moving parts in an air conditioning or refrigeration compressor. The refrigeration oil must function without maintenance or service at higher than usual temperatures for the life of the unit. It must also be miscible with the refrigerant while retaining its lubricant properties. • Nu-Calgon mineral oils are designed to provide years of trouble-free service in refrigeration and air conditioning units. There is no finer mineral refrigeration lubricant on the market today. • Small amounts of refrigeration oil are carried with the refrigerant through the entire system and are subject to very low temperatures. Poor low temperature solubility or miscibility can cause the oil to separate from the refrigerant and form wax-like deposits which can clog a system. And this is more critical in R-22 and R-502 systems because they have limited miscibility with mineral oil. Therefore, it is important that the mineral oil have good low temperature miscibility. • The “Floc Point Test” is used to determine low temperature performance. The floc point is determined by cooling a mixture of 10% oil and 90% refrigerant in a sealed tube. The mixture is observed at 5° increments for cloudiness due to flocculant formation. • Recommended by OEM’s for use with CFC’s and HCFC’s • Approved by OEM’s including Copeland, Carlyle, etc. • C-3s is approved replacement for 3GS
