Type II — High-Pressure第 126 / 240 题
A technician wants to speed up vapor recovery from an R-410A condensing unit. Which practice will increase recovery speed?
a.Making the connecting hoses as long and thin as possible
b.Using large-diameter, short hoses and cooling the recovery cylinder
c.Closing the recovery machine's discharge valve partway
d.Recovering only through the smallest available Schrader port
解析
Recovery speed improves with large-diameter, short hoses that reduce flow restriction, and with a cool recovery cylinder that keeps its internal pressure low so refrigerant flows into it. Long, thin hoses and tiny ports restrict flow and slow recovery. Chilling the cylinder (for example in ice water) creates a favorable pressure difference.
免费刷完整 240 道题库 — 无需注册。
同考点相关题目
- A supermarket rack system holds 350 pounds of R-404A. Using recovery equipment manufactured after November 15, 1993, to what vacuum must the technician evacuate during recovery?
- A technician recovers R-22 with an older recovery unit manufactured before November 15, 1993 from a system holding 250 pounds. What is the required evacuation level?
- A technician must recover a large liquid charge from a supermarket rack quickly. Which recovery method moves the most refrigerant in the least time for large systems?
- After replacing a compressor on an R-410A system, a technician needs to remove moisture and noncondensables before charging. Which procedure is the correct way to dehydrate the system?
- During evacuation of a Type II system, a technician wants to confirm the system has reached a deep, dry vacuum. Which instrument gives the precise reading needed?
- A technician performs triple evacuation on a Type II system. What gas is used to break the vacuum between evacuations?