Core (Universal)Câu 21 / 240
A technician is recovering R-134a from a high-pressure appliance manufactured after November 15, 1993, that normally holds less than 200 pounds. To what level must the system be evacuated using recovery equipment?
a.0 inches of mercury (Hg) vacuum
b.25 inches Hg vacuum
c.29.9 inches Hg vacuum
d.15 psig positive pressure
Giải thích
For a high-pressure appliance normally containing less than 200 pounds and manufactured on or after November 15, 1993, the required recovery level is 0 inches of mercury (Hg) vacuum, meaning down to atmospheric pressure. The deeper 25 inch Hg level applies to low-pressure appliances, and leaving positive pressure would leave refrigerant behind. Recovery levels depend on the appliance type, size, and manufacture date.
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 wants a single certification that allows work on small appliances, high-pressure systems, and low-pressure systems. Which does the technician need?
- How long does an EPA Section 608 technician certification remain valid?
- A parts counter clerk is asked to sell a 25-pound cylinder of R-410A to a walk-in customer. Under Section 608 sales restrictions, the clerk may sell it only to someone who:
- A technician is disposing of a low-pressure chiller manufactured after November 15, 1993. Which evacuation level generally applies to low-pressure appliances during recovery?
- A technician recovers refrigerant from a household window air conditioner (a small appliance) whose compressor still runs. Recovery equipment made after November 15, 1993 must remove at least what percentage of the charge?
- What is 'system-dependent' (passive) recovery?
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