Type III — Low-PressureQuestion 194 of 240
Which of the following is NOT a low-pressure appliance refrigerant?
a.CFC-11
b.HFC-404A
c.HCFC-123
d.R-1233zd
Explanation
HFC-404A is a high-pressure blend used in commercial refrigeration, not a low-pressure chiller refrigerant. CFC-11, HCFC-123, and R-1233zd are all low-pressure refrigerants that run in a vacuum. Sorting refrigerants by pressure class is a common exam task.
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