Type III — Low-Pressure第 168 / 240 题
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
解析
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.
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同考点相关题目
- Which of the following is a low-pressure refrigerant used in centrifugal chillers?
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