Type II — High-PressureCâu 140 / 240
A very-high-pressure appliance using R-13 must have its refrigerant recovered before service. Using recovery equipment made after November 15, 1993, what is the required evacuation level?
a.15 inches Hg vacuum
b.10 inches Hg vacuum
c.0 inches Hg (atmospheric pressure)
d.25 mm Hg absolute
Giải thích
For very-high-pressure appliances (such as those using R-13 or R-503), the required recovery evacuation level is 0 inches Hg (atmospheric), for equipment made before or after November 15, 1993. These refrigerants have such high pressures that reaching atmospheric already removes most of the charge. The deeper 10 and 15 inches Hg levels apply to ordinary high-pressure appliances.
Trích dẫn luật: 40 CFR §82.156Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
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