Type II — High-PressureCâu 154 / 240
A technician performs a standing pressure (leak) test on a repaired Type II system using dry nitrogen. Over several hours the pressure holds steady with no drop. What does this indicate?
a.The system definitely needs more refrigerant
b.There must be a large leak
c.The nitrogen has turned to liquid
d.No detectable leak is present, so evacuation and charging can proceed
Giải thích
A standing pressure test that holds steady over time (after correcting for temperature changes) indicates no detectable leak. The technician can then evacuate and charge the system. A pressure drop, by contrast, would signal a leak that must be found and repaired before charging.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- 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?
- Before opening a Type II system for a compressor change, a technician recovers the refrigerant. Which sequence best protects both the technician and the environment?
- A technician is selecting a vacuum pump to properly dehydrate a Type II R-410A system. Why is a dedicated vacuum pump used instead of the recovery machine to pull the final vacuum?
- A technician retrofitting an R-22 system to an HFC replacement changes the oil and refrigerant. Which additional component is most commonly replaced during the retrofit?
- A technician is unsure which required vacuum applies to a high-pressure appliance during recovery. Which two factors determine the required evacuation level?
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