EPA Refrigerant Types and Properties Flashcards
6 cards from real EPA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 EPA Refrigerant Types and Properties flashcards as text
What is the primary environmental concern with CFC refrigerants such as R-11 and R-12?
Answer: Ozone layer depletion
CFC refrigerants release chlorine atoms when broken down by UV radiation in the stratosphere, which catalytically destroy ozone molecules.
Which refrigerant has an ASHRAE safety classification of A2L, indicating it is mildly flammable?
Answer: R-32
R-32 is classified as A2L because it is mildly flammable with a low burning velocity, requiring specific handling precautions compared to non-flammable refrigerants.
What is the critical temperature of a refrigerant?
Answer: The temperature above which the refrigerant cannot be liquefied regardless of pressure
The critical temperature is the point above which a substance cannot exist in liquid form no matter how much pressure is applied.
How are refrigerant blends with a temperature glide best charged into a system?
Answer: As a liquid from the cylinder
Zeotropic refrigerant blends with temperature glide should be charged as a liquid to maintain the correct mixture ratios and prevent fractionation.
Which refrigerant was commonly used in automotive air conditioning before being phased out due to ozone depletion concerns?
Answer: R-12
R-12 (dichlorodifluoromethane) was the standard automotive AC refrigerant until it was phased out under the Clean Air Act due to its high ODP.
What does 'ODP' stand for in refrigerant classification?
Answer: Ozone Depletion Potential
ODP (Ozone Depletion Potential) measures how much a refrigerant can destroy stratospheric ozone relative to R-11, which has an ODP of 1.0.