Type I — Small AppliancesCâu 115 / 240
Which statement about system-dependent (passive) recovery on small appliances is correct?
a.It requires an EPA-approved 25 mm Hg absolute vacuum
b.It may be used on any high-pressure appliance up to 50 pounds
c.It always recovers 100% of the charge
d.It can rely on the appliance's own pressure or compressor and is limited to appliances with 5 pounds or less of refrigerant
Giải thích
Passive (system-dependent) recovery uses the appliance's internal pressure or its compressor to move refrigerant and is limited to small appliances with five pounds or less of refrigerant. It cannot legally be used on larger appliances. No recovery method removes 100% of the charge, and the deep 25 mm Hg absolute vacuum applies to low-pressure equipment.
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 PTAC unit in a hotel room holds 4.5 pounds of R-410A and is factory-sealed. A technician must replace the compressor. Before opening the sealed system, the technician must:
- A technician's self-contained recovery machine is labeled as certified for small-appliance recovery. What performance does that certification confirm it can meet?
- 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?
- 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 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 new hire will only recover, service, and dispose of household refrigerators and window units. Which is the minimum certification the employer should require?
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