Type III — Low-PressureCâu 191 / 240
The main reason a torch must never be used to warm a low-pressure chiller during recovery is that:
a.It wastes propane
b.It cools the refrigerant too fast
c.Open flame can decompose refrigerant into toxic gases and is a burn and pressure hazard
d.It has no effect on recovery speed
Giải thích
An open flame can break refrigerant down into toxic gases such as phosgene and hydrogen chloride, and localized heating can raise pressure dangerously and cause burns. Warm water or built-in heaters are the safe way to add heat. This is why torches are prohibited for warming the shell.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Low-loss fittings on recovery hoses are important on low-pressure work because they:
- Which refrigerant is a CFC once widely used in low-pressure chillers and now available only as reclaimed stock?
- A machine room housing a low-pressure chiller should have a refrigerant monitor and ventilation mainly to protect against:
- In a low-pressure chiller, the evaporator normally operates:
- A technician recovering R-123 reaches 25 mm Hg absolute but the reading rises back up after the recovery machine stops. This usually indicates:
- Which of the following is NOT a low-pressure appliance refrigerant?
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