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.Refrigerant is still boiling out of the oil or the machine has a leak
b.The recovery is complete and correct
c.The cylinder is empty
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。
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:
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