What evacuation level must be reached?
Recovery requirements · EPA 608 Type II. The correct answer, and the reasoning behind it.
Evacuation levels by charge size and equipment date, major repairs, and system-dependent limits.
The question
An R-500 system with a 250-pound charge is being retired. The recovery machine was made in 1992. What evacuation level must be reached?
- 15 inches of Hg vacuum
- 10 inches of Hg vacuum
- 4 inches of Hg vacuumCorrect answer
- 0 inches of Hg vacuum
Why “4 inches of Hg vacuum” is correct
R-500 is listed as a medium-pressure refrigerant. A medium-pressure appliance of 200 pounds or more needs 15 inches with newer equipment, but only 4 inches with equipment made before November 15, 1993. Disposal uses the same table.
Source: 40 CFR 82.156(a), Table 1; 40 CFR 82.152
Why the other answers are wrong
- 15 inches of Hg vacuum — 15 inches would apply if the recovery machine were made on or after November 15, 1993.
- 10 inches of Hg vacuum — 10 inches is the newer-equipment level for medium-pressure appliances under 200 pounds.
- 0 inches of Hg vacuum — 0 inches is not a medium-pressure level in Table 1.
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