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HVAC: EPA 608 Certification Study Guide Questions and Answers, latest updated 2023
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HVAC: EPA 608 Certification Study Guide Questions and Answers, latest updated 2023 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 wha...
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