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CRST Certified Refrigeration Service Technician VIP Exam
CRST — The CRST (Certified Refrigeration Service Technician) certification is administered by RSES International (Refrigeration Service Engineers Society); the exam consists of approximately 100 questions covering refrigeration fundamentals, system components, electrical systems, service procedures, EPA regulations, and commercial refrigeration troubleshooting, with a passing score of 70%.
30
Questions
180m
Time Limit
70.00%
To Pass
Question 1 of 30👑 VIP
A technician is servicing a medium-temperature walk-in cooler operating with R-448A refrigerant. The suction pressure reads 40 psig and the discharge pressure reads 225 psig. The ambient temperature in the machine room is 85°F. Using a pressure-temperature chart, the technician determines the suction saturation temperature is approximately 20°F, but the product inside the cooler is being held at 35°F. Which of the following BEST explains the 15°F difference between the saturation temperature and the cooler air temperature?
Questions 2–30 and full explanations are VIP-exclusive.