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.The nitrogen has turned to liquid
c.There must be a large leak
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?
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- 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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