Excellent filtration has always been a necessity in refrigeration. Whether the refrigerant/oil combinations are CFCs/HCFCs with mineral or alkylbenzene oil, or HFCs with polyolester (POE) lubricant, proper filtration aids in maximizing system life. However, the proliferation of POE lubricants has made filtration increasingly important in HFC refrigerant systems due to the properties of POE.
Because of its chemical composition, a POE lubricant has the ability to suspend and circulate a large concentration of particles in the system. Circulating particles cause adverse compressor wear, and lead to nuisance plug-ups at thermostatic expansion valves, solenoid valves, pressure regulating valves, and oil level controls.