Exam (elaborations)
HVAC: EPA 608 Certification exam with correct answ
- Course
- Institution
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 ...
[Show more]