Concepts and their limits
The small-appliance percentage target is 80% with pre-November-15-1993 recovery equipment or a nonfunctional compressor; 90% applies with later equipment and a functional compressor. The small-appliance percentage target is 80% with pre-November-15-1993 recovery equipment or a nonfunctional compressor; 90% applies with later equipment and a functional compressor. The small-appliance percentage target is 80% with pre-November-15-1993 recovery equipment or a nonfunctional compressor; 90% applies with later equipment and a functional compressor. The small-appliance service rule allows the stated four-inches-of-mercury-vacuum alternative to the percentage recovery method.
Worked decisions
A qualifying small appliance initially contains 2 lb. Recovery equipment was manufactured before November 15, 1993, and the appliance compressor is functional. Using the percentage method, what minimum mass must be recovered? The decision is 1.6 lb. The applicable recovery fraction is 80%; multiply 2 lb by 80/100. This is a rule-based learning calculation, not a field recovery procedure. A qualifying small appliance initially contains 2 lb. Recovery equipment was manufactured after November 15, 1993, and the appliance compressor is functional. Using the percentage method, what minimum mass must be recovered? The decision is 1.8 lb. The applicable recovery fraction is 90%; multiply 2 lb by 90/100. This is a rule-based learning calculation, not a field recovery procedure. A qualifying small appliance initially contains 1 lb. Recovery equipment was manufactured after November 15, 1993, and the appliance compressor is not functional. Using the percentage method, what minimum mass must be recovered? The decision is 0.8 lb. The applicable recovery fraction is 80%; multiply 1 lb by 80/100. This is a rule-based learning calculation, not a field recovery procedure. A technician uses the small-appliance vacuum alternative rather than measuring a recovery percentage. Which target is stated by EPA? The decision is Four inches of mercury vacuum. The small-appliance service rule allows the stated four-inches-of-mercury-vacuum alternative to the percentage recovery method.
Contrasts that change the decision
A qualifying small appliance initially contains 3 lb. Recovery equipment was manufactured before November 15, 1993, and the appliance compressor is functional. Using the percentage method, what minimum mass must be recovered? Here the supported answer is 2.4 lb. The applicable recovery fraction is 80%; multiply 3 lb by 80/100. This is a rule-based learning calculation, not a field recovery procedure. A qualifying small appliance initially contains 3 lb. Recovery equipment was manufactured after November 15, 1993, and the appliance compressor is functional. Using the percentage method, what minimum mass must be recovered? Here the supported answer is 2.7 lb. The applicable recovery fraction is 90%; multiply 3 lb by 90/100. This is a rule-based learning calculation, not a field recovery procedure. A qualifying small appliance initially contains 2 lb. Recovery equipment was manufactured after November 15, 1993, and the appliance compressor is not functional. Using the percentage method, what minimum mass must be recovered? Here the supported answer is 1.6 lb. The applicable recovery fraction is 80%; multiply 2 lb by 80/100. This is a rule-based learning calculation, not a field recovery procedure. A small-appliance worksheet records 4 inches Hg vacuum. Which interpretation is correct? Here the supported answer is A vacuum relative to the stated reference, not 4 psig positive pressure. The small-appliance service rule allows the stated four-inches-of-mercury-vacuum alternative to the percentage recovery method.
Transfer and self-check
A qualifying 4 lb small appliance has a failed appliance compressor and later recovery equipment. What percentage-route mass is required? The failed-compressor branch uses 80 percent:4×0.80=3.2 lb. The later machine date does not turn this case into the functional-compressor 90 percent branch.
A qualifying small appliance initially contains 2 lb. Recovery equipment was manufactured before November 15, 1993, and the appliance compressor is functional. Using the percentage method, what minimum mass must be recovered?
- The relevant stated condition is: A qualifying small appliance initially contains 2 lb.
- Apply the relevant source rule. The applicable recovery fraction is 80%; multiply 2 lb by 80/100. This is a rule-based learning calculation, not a field recovery procedure.
- This supports “1.6 lb”. The alternative “0.4 lb” uses a different condition or conclusion;the applicable rule above explains why it does not answer this case.
Compare the other answer choices
This choice (0.4 lb) does not fit the stated conditions. The small-appliance percentage target is 80% with pre-November-15-1993 recovery equipment or a nonfunctional compressor; 90% applies with later equipment and a functional compressor.
This choice (2 lb) does not fit the stated conditions. The small-appliance percentage target is 80% with pre-November-15-1993 recovery equipment or a nonfunctional compressor; 90% applies with later equipment and a functional compressor.
This choice (1.8 lb) does not fit the stated conditions. The small-appliance percentage target is 80% with pre-November-15-1993 recovery equipment or a nonfunctional compressor; 90% applies with later equipment and a functional compressor.
Try it, then explain it.
Complete a short set without looking at the example. After each answer, explain which evidence or rule supports your decision and why the alternatives do not fit.
Sources & authorship
Original Slope explanations and examples. References support the concepts; they are not the source of copied questions. Independent educator review is pending.
Epa Practices