EPA Section 608 Universal Certification ExamType III (Low-Pressure Appliances)Medium
A technician is performing a recovery of R-123 from a low-pressure chiller. Which of the following statements about the recovery process is true?
- AA water-cooled recovery unit is generally faster than an air-cooled unit for low-pressure refrigerants.
- BThe recovery unit should be operated at the highest possible discharge pressure.
- CIt is acceptable to recover R-123 into a cylinder containing R-22 if both are Type III refrigerants.
- DThe recovery cylinder must be heated to speed up the recovery rate.
Show answer & explanationAnswer & explanation
Correct answer: A. A water-cooled recovery unit is generally faster than an air-cooled unit for low-pressure refrigerants.
Water-cooled recovery units are typically more efficient and faster than air-cooled units, especially for low-pressure refrigerants. The water helps to cool the refrigerant in the recovery unit's condenser, creating a greater pressure differential and thus a faster recovery rate.
Why the other options are wrong
- B. Operating at the highest discharge pressure would slow down recovery by reducing the pressure differential.
- C. Mixing refrigerants is strictly prohibited as it creates an unusable mixture and requires special disposal.
- D. Heating the recovery cylinder is dangerous and can cause over-pressurization; it should be cooled.
Low-Pressure Recovery Unit Efficiency
Factors and types of recovery units that impact the speed and effectiveness of refrigerant recovery from low-pressure systems.
- Water-cooled units are generally faster.
- Efficient cooling of the recovery cylinder is crucial.
- Pressure differential drives recovery rate.
Memory trick: Water cools the tank, recovery's a bank!