Type III — Low-PressureQuestion 168 of 240
To speed up refrigerant recovery from a low-pressure chiller, a technician should:
a.Cool the chiller and warm the cylinder
b.Apply a torch to the chiller shell
c.Add nitrogen to raise pressure to 20 psig
d.Warm the refrigerant and keep the recovery cylinder cool
Explanation
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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