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Examen
ASE A7 Test Prep (HVAC) Exam Questions and Answers.
ASEA7TestPrep(HVAC)ExamQuestionsand 
Answers. 
When the defrost setting is selected, the compressor operates. 
(True or False) - Correct Answer True 
R744 refrigerant is pure CO2 
(True or False) - Correct Answer True 
Technician A says on R134a systems, you may not find any evidence of oil, even with a 
leak, because the lubricant is water soluble, and could wash away. 
Technician B says never use compressed air to leak test or pressure test an R134a 
system. 
Which technician is correct ? - Co...