HVAC EPA 608 Certification Study Guide
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HVAC EPA 608 Certification Study Guide 1. Are there drop-in substitutes for R-12 systems? If so, why or why not? - ️ No, there are no drop-in replacements for R-12 systems because the new refrigerants are incompatible with the oils and lubricants used in those systems. 2. What type of oil is used with R-134a, and how does it interact with other oils? - ️ R-134a systems use ester-based oils, which do not mix with other types of oils. 3. What lubricant is utilized with HCFCs? - ️ HCF...