A technician must recover a large liquid charge from a supermarket rack quickly. Which recovery method moves the most refrigerant in the least time for large systems?
a.Recovering only from the compressor oil
b.Passive recovery using the system's pressure
c.The push-pull (liquid) method
d.Vapor recovery through a single low-side port
Explanation
The push-pull method recovers liquid refrigerant directly and is the fastest way to move a large charge, making it ideal for big systems like supermarket racks. Recovering vapor through a single port is much slower. Push-pull is generally used only when a system holds a substantial liquid charge (roughly 10 to 15 pounds or more).
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Related questions on this topic
- A technician uses recovery equipment manufactured after November 15, 1993 on an R-22 split system that normally holds less than 200 pounds of refrigerant. To what level must the appliance be evacuated during recovery?
- A supermarket rack system holds 350 pounds of R-404A. Using recovery equipment manufactured after November 15, 1993, to what vacuum must the technician evacuate during recovery?
- A technician recovers R-22 with an older recovery unit manufactured before November 15, 1993 from a system holding 250 pounds. What is the required evacuation level?
- A technician wants to speed up vapor recovery from an R-410A condensing unit. Which practice will increase recovery speed?
- After replacing a compressor on an R-410A system, a technician needs to remove moisture and noncondensables before charging. Which procedure is the correct way to dehydrate the system?
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