Type II — High-PressureCâu 149 / 240
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.It cools the refrigerant too much
b.It has no effect on the compressor
c.It only affects R-410A systems
d.Liquid entering the suction can slug and mechanically damage the compressor
Giải thích
Feeding liquid directly into the suction of a running compressor can cause liquid slugging, which can bend valves or break internal parts because liquid does not compress. When adding liquid to the low side, it must be metered or throttled so it flashes to vapor before reaching the compressor. This risk applies to high-pressure systems in general, not just R-410A.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- 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 deciding between liquid and vapor recovery on a Type II system with a moderate charge. Which statement correctly compares the two?
- 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?
- A technician measures subcooling of 3°F on a TXV-equipped R-410A system when the manufacturer specifies 10°F of subcooling. What does the low subcooling most likely indicate?
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