Type III — Low-Pressure第 198 / 240 题
The deep 25 mm Hg absolute recovery requirement exists for low-pressure appliances because:
a.They operate above atmospheric pressure
b.Their charge is very small
c.Their refrigerant boils near room temp
d.They contain no oil
解析
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.
法律依据: 40 CFR §82.156免费刷完整 240 道题库 — 无需注册。
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同考点相关题目
- 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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