Low-pressure refrigerants such as R-123 are most often used in which type of equipment?
Refrigeration · EPA 608 Type III. The correct answer, and the reasoning behind it.
Purge units and pressure-temperature behaviour of low-pressure refrigerants.
The question
Low-pressure refrigerants such as R-123 are most often used in which type of equipment?
- Household refrigerators
- Residential split heat pumps
- Supermarket display cases
- Large centrifugal chillersCorrect answer
Why “Large centrifugal chillers” is correct
Low-pressure refrigerants have low vapor density and suit centrifugal compressors that move very large volumes of vapor. That is why the Type III exam centers on centrifugal chillers.
Source: EPA: Test Topics; 40 CFR 82.152
Why the other answers are wrong
- Household refrigerators — Household refrigerators are small appliances, covered by Type I.
- Residential split heat pumps — Residential splits use higher-pressure refrigerants such as R-410A.
- Supermarket display cases — Display cases use medium- or high-pressure refrigerants.
Practice more of this
More EPA 608 Type III practice questions, or see every EPA 608 practice test.
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