Type III — Low-PressureCâu 198 / 240
The deep 25 mm Hg absolute recovery requirement exists for low-pressure appliances because:
a.Their charge is very small
b.Their refrigerant boils near room temperature and must be pulled out thoroughly under deep vacuum
c.They contain no oil
d.They operate above atmospheric pressure
Giải thích
Low-pressure refrigerant boils near room temperature, so recovering it fully requires pulling the appliance down to a deep vacuum of 25 mm Hg absolute to draw out the remaining vapor. Shallow vacuums would leave significant refrigerant behind. The deep level ensures thorough recovery from these vacuum-operating machines.
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
- Which of the following is NOT a low-pressure appliance refrigerant?
- Excessive water in a low-pressure chiller can freeze and rupture tubes because low-pressure refrigerants:
- When handling a large recovery cylinder of R-11 removed from a chiller, the technician must remember to:
- A high-efficiency purge unit on a chiller is often equipped with a purge-rate log because a rising rate:
- Which practice is correct when leak testing a low-pressure chiller that is under a vacuum?
- The main safety concern that sets the 10 psig pressurization limit on low-pressure appliances is:
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