C-38 Refrigeration
California CSLB C-38 Refrigeration Examination
Refrigeration System MaintenanceEnglish
Exam overviewPractice session
During annual preventive maintenance on an R-507A rack compressor using Polyolester (POE) oil, a synthetic oil sample test indicates an acid number exceeding 0.20 mg KOH/g. What maintenance action is required?
Loading your practice session…