HVAC: EPA 608 Certification Study Guide| Questions and 100% correct answers| Latest Update

HVAC: EPA 608 Certification Study Guide| Questions and 100% correct answers| Latest Update Are there drop-in replacements for R-12 systems? Why or why not? No because the new refrigerants are incompatible with the oils and lubricants used in R-12 systems. What type of oil is used in R-134a and what oils will it mix with? Ester based oils and they do not mix with other oils What type of lubricant is used with HCFCs? Alkylbenzene lubricantWhat is difference b/w ternary blend a azeotropic blend? Ternary blends are three-part mixtures whereas azeotropic blends are blends of two or more compounds that act like a single compound. What is the trait of a hygroscopic lubricant? It absorbs (takes on) moisture What is temperature glide and what type of blend won't have it? Temp. blend is the difference between the dew point and the bubble point Dew PointOccurs when saturation temp in evaporator causes refrigerant to change from liquid to vapor Bubble Point Occurs when saturation temp in condenser changes refrigerant from vapor to liquid Will the gases in a ternary blend leak at the same rate? Why or why not?