EPA Section 608 Universal Certification ExamType III (Low-Pressure Appliances)Easy
A technician is performing a recovery on a low-pressure chiller containing R-123. The EPA-mandated recovery vacuum level for appliances with a full charge of 35 pounds or more, using recovery equipment manufactured after November 15, 1993, is:
- A25 mm Hg absolute
- B0 psig
- C4 inches of Hg vacuum
- D10 inches of Hg vacuum
Show answer & explanationAnswer & explanation
Correct answer: A. 25 mm Hg absolute
For low-pressure appliances with a full charge of 35 pounds or more, using recovery equipment manufactured after November 15, 1993, the EPA-mandated recovery vacuum is 25 mm Hg absolute. This ensures thorough removal of refrigerant.
Why the other options are wrong
- B. 0 psig is atmospheric pressure and not a sufficient vacuum for recovery.
- C. 4 inches of Hg vacuum is not the correct specific vacuum level for this type of appliance.
- D. 10 inches of Hg vacuum is not the correct specific vacuum level for this type of appliance.
Low-Pressure Appliance Recovery Standard (Post-1993)
The EPA-mandated vacuum level for recovering refrigerant from low-pressure appliances with a full charge of 35 lbs or more, using equipment manufactured after Nov 15, 1993.
- Applies to low-pressure appliances.
- Charge size: 35 lbs or more.
- Equipment manufactured after November 15, 1993.
- Required vacuum: 25 mm Hg absolute.
Memory trick: Low pressure, deep vacuum, 25 is the key, post-93, for 35 and free.