Type III — Low-PressureCâu 168 / 240
To speed up refrigerant recovery from a low-pressure chiller, a technician should:
a.Apply a torch to the chiller shell
b.Add nitrogen to raise pressure to 20 psig
c.Cool the chiller and warm the cylinder
d.Warm the refrigerant and keep the recovery cylinder cool
Giải thích
Recovery moves fastest when the refrigerant is warm and the recovery cylinder is cooler, so vapor naturally migrates toward the cold cylinder. Warm the chiller by circulating warm water or using built-in heaters, never a torch. Overpressurizing with nitrogen or applying open flame is unsafe.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Which of the following is a low-pressure refrigerant used in centrifugal chillers?
- Because a low-pressure chiller operates in a vacuum on the low side, what happens when it develops a leak?
- Water entering the refrigerant side of a low-pressure chiller through a leaking tube is dangerous mainly because it can:
- Frequent operation of the purge unit on a low-pressure chiller is usually a sign that:
- A low-pressure refrigerant is defined as one with a boiling point at atmospheric pressure that is:
- Which gas is safe to use, along with a trace of refrigerant, to raise pressure in a low-pressure appliance for leak detection?
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