Type I — Small AppliancesCâu 112 / 240
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.Do nothing special because R-410A is nontoxic
b.Evacuate the system to 25 mm Hg absolute
c.Add refrigerant to raise the pressure first
d.Recover the refrigerant to the small-appliance level (80%/90% or 4 inches Hg vacuum)
Giải thích
A factory-sealed PTAC with less than five pounds of refrigerant is a small appliance, so recovery must meet the 80%/90% or 4 inches Hg vacuum requirement before opening the system. The deeper 25 mm Hg absolute level applies to low-pressure (Type III) appliances. Recovery is mandatory before any repair that opens the sealed circuit.
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 finds a household refrigerator whose sealed system was already opened and is now at 0 psig (atmospheric). During service the technician plans to recover any refrigerant present. What is the best action?
- A water cooler and a household freezer are both factory-sealed with about 3 pounds of refrigerant each. A technician servicing them must, at minimum, hold which certification and follow which recovery rule?
- After recovering refrigerant into a recovery cylinder from several small appliances, a technician wants to reuse the recovered refrigerant in a customer's unit without sending it out. What is generally required?
- 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?
- Which statement about system-dependent (passive) recovery on small appliances is correct?
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