Type III — Low-Pressure第 193 / 240 题
A technician recovering R-123 reaches 25 mm Hg absolute but the reading rises back up after the recovery machine stops. This usually indicates:
a.The recovery is complete and correct
b.The cylinder is empty
c.Refrigerant still in the oil
d.The rupture disk has failed
解析
If the vacuum will not hold and pressure rises after the machine stops, refrigerant is still off-gassing from the oil, or air is leaking into the appliance or hoses. You must continue recovery or find the leak before considering the job done. A stable 25 mm Hg absolute is the target.
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
- A machine room housing a low-pressure chiller should have a refrigerant monitor and ventilation mainly to protect against:
- The main reason a torch must never be used to warm a low-pressure chiller during recovery is that:
- In a low-pressure chiller, the evaporator normally operates:
- 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:
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