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 is still boiling out of the oil or the machine has a leak
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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