Type III — Low-PressureCâu 161 / 240
A technician is recovering R-11 from a low-pressure centrifugal chiller for a tear-down. To what evacuation level must the appliance be recovered?
a.25 mm Hg absolute
b.10 inches Hg vacuum
c.15 psig
d.4 inches Hg vacuum
Giải thích
Low-pressure appliances must be evacuated to 25 mm Hg absolute, a deep vacuum roughly equal to 29 inches of mercury vacuum. This level is the same whether the recovery equipment was made before or after November 15, 1993. The inches-of-mercury figures apply to high-pressure systems, not low-pressure chillers.
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
- When pressurizing a low-pressure appliance to search for leaks, what is the maximum pressure a technician may apply?
- The rupture disk on a low-pressure chiller is a safety device that is typically designed to relieve at what pressure?
- What is the primary purpose of a purge unit on a low-pressure centrifugal chiller?
- Which of the following is a low-pressure refrigerant used in centrifugal chillers?
- Because a low-pressure chiller operates in a vacuum on the low side, what happens when it develops a leak?
- Water entering the refrigerant side of a low-pressure chiller through a leaking tube is dangerous mainly because it can:
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