Type II — High-PressureCâu 148 / 240
A technician is deciding between liquid and vapor recovery on a Type II system with a moderate charge. Which statement correctly compares the two?
a.Vapor recovery is always faster than liquid recovery
b.Liquid recovery is illegal under Section 608
c.Liquid recovery is faster for larger charges, while vapor recovery is used to finish and clear the remaining refrigerant
d.Only vapor recovery can be used on high-pressure systems
Giải thích
Liquid recovery moves refrigerant faster and is preferred for larger charges, while vapor recovery is typically used to pull down and clear the last of the refrigerant after the liquid is gone. Many jobs start in liquid mode and switch to vapor to finish. Both methods are legal, and liquid recovery is common on high-pressure systems.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A technician performing recovery notices the process is very slow because the recovery cylinder is warm and its pressure is high. Which action will speed recovery?
- A technician needs to evacuate a Type II system to remove moisture and reaches 500 microns on the micron gauge. After isolating the pump, the reading climbs and stabilizes around 5,000 microns. What does this most likely indicate?
- A technician recovers R-22 from a rooftop unit that holds 150 pounds using equipment made after November 15, 1993. To what vacuum must the system be evacuated during recovery?
- A technician is about to add liquid refrigerant into the suction line of a running compressor to charge faster. Why is this dangerous on a Type II system?
- A technician replaces a leaking evaporator on an R-410A system and must protect the new POE oil during the repair. Why is POE oil handling important?
- Virgin (newly produced) HCFC-22 was subject to a production and import phaseout. As of January 1, 2020, what happened to the supply of virgin R-22?
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