Type II — High-PressureQuestion 145 of 240
A technician performing recovery notices the process is very slow because the recovery cylinder is warm and its pressure is high. Which action will speed recovery?
a.Warm the recovery cylinder with a torch
b.Cool the recovery cylinder (for example in an ice-water bath) to lower its pressure
c.Disconnect the vacuum pump
d.Add nitrogen to the recovery cylinder
Explanation
Cooling the recovery cylinder lowers its internal pressure, increasing the pressure difference that drives refrigerant into it and speeding recovery. Warming the cylinder raises its pressure and slows the process. Adding nitrogen would contaminate the refrigerant with noncondensables and is not acceptable.
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