Which of these repairs on an R-123 chiller is not a major repair under 40 CFR 82.152?
Recovery requirements · EPA 608 Type III. The correct answer, and the reasoning behind it.
Evacuation levels for low-pressure appliances, and major versus non-major repairs.
The question
Which of these repairs on an R-123 chiller is not a major repair under 40 CFR 82.152?
- Removing the compressor for a rebuild
- Removing an auxiliary heat exchange coil
- Uncovering a 6-square-inch opening for 30 minutes
- Uncovering a 3-square-inch opening for 20 minutesCorrect answer
Why “Uncovering a 3-square-inch opening for 20 minutes” is correct
An opening makes a repair major only when it is more than 4 square inches of flow area and lasts more than 15 minutes. A 3-square-inch opening fails the area test even though it lasts 20 minutes, so that repair is not major.
Source: 40 CFR 82.152
Why the other answers are wrong
- Removing the compressor for a rebuild — Removing the compressor is a major repair by definition.
- Removing an auxiliary heat exchange coil — Removing an auxiliary heat exchange coil is listed as a major repair.
- Uncovering a 6-square-inch opening for 30 minutes — This exceeds both 4 square inches and 15 minutes, so it is major.
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