Type I — Small AppliancesCâu 117 / 240
A technician evacuates a small appliance to 4 inches Hg vacuum and, after closing the valves, watches the pressure rise back toward zero. What does this rising pressure most likely indicate?
a.The recovery is complete and the reading can be recorded
b.Refrigerant is still boiling out of the oil, so recovery should continue until the vacuum holds
c.The appliance is a Type II unit
d.The vacuum pump is oversized
Giải thích
A vacuum that rebounds after the valves are closed usually means refrigerant is still coming out of the oil and internal surfaces, so the system is not fully recovered. The technician should continue recovering until the vacuum holds at the required level. A stable 4 inches Hg vacuum is what confirms the small-appliance requirement is met.
Trích dẫn luật: 40 CFR §82.156Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- A technician recovers refrigerant from ten small appliances into one recovery cylinder over a day. What must the technician watch to avoid overfilling the cylinder?
- Which statement about system-dependent (passive) recovery on small appliances is correct?
- A homeowner offers to help a Type I technician 'top off' a leaking mini-fridge instead of finding the leak. What is the best professional practice?
- A new hire will only recover, service, and dispose of household refrigerators and window units. Which is the minimum certification the employer should require?
- A technician needs a permanent, leak-free access point after servicing a small sealed refrigerator. Which method is preferred over leaving a bolt-on piercing valve?
- A technician plans to recover from a chest freezer whose compressor is seized (inoperable). Which combination correctly describes the required equipment and recovery level?
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