Type II — High-Pressure第 145 / 240 题
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.Cool the recovery cylinder
b.Disconnect the vacuum pump
c.Warm the recovery cylinder with a torch
d.Add nitrogen to the recovery cylinder
解析
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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同考点相关题目
- During recovery from a Type II system, a technician sees noncondensable gases (air) collected in the recovery cylinder. What is the correct handling under Section 608?
- A DOT-approved refrigerant recovery cylinder must be periodically retested for safety. What is the standard hydrostatic retest interval for these cylinders?
- A technician wants a quick way to know whether a recovery cylinder is a refrigerant recovery cylinder by its color scheme. What is the standard color for a refrigerant recovery cylinder?
- A technician needs to evacuate a Type II system to remove moisture and reaches 500 microns on the micron gauge. After isolating the pump, the reading climbs and stabilizes around 5,000 microns. What does this most likely indicate?
- A technician recovers R-22 from a rooftop unit that holds 150 pounds using equipment made after November 15, 1993. To what vacuum must the system be evacuated during recovery?
- A technician is deciding between liquid and vapor recovery on a Type II system with a moderate charge. Which statement correctly compares the two?
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