Type III — Low-PressureCâu 193 / 240
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
Giải thích
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.
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
- 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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