Type II — High-Pressure第 123 / 240 题
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.15 inches Hg vacuum
b.10 inches Hg vacuum
c.4 inches Hg vacuum
d.25 mm Hg absolute
解析
For a high-pressure appliance containing 200 pounds or more of refrigerant, recovery equipment made after November 15, 1993 must reach 15 inches of mercury vacuum. Systems under 200 pounds require only 10 inches Hg. The 25 mm Hg absolute level applies to low-pressure (Type III) appliances, not high-pressure racks.
法律依据: 40 CFR §82.156免费刷完整 240 道题库 — 无需注册。
同考点相关题目
- A technician is certifying to work on R-22 and R-410A air conditioners, supermarket racks, and heat pumps. Which EPA technician type covers high-pressure and very-high-pressure appliances?
- A technician uses recovery equipment manufactured after November 15, 1993 on an R-22 split system that normally holds less than 200 pounds of refrigerant. To what level must the appliance be evacuated 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?
- A technician wants to speed up vapor recovery from an R-410A condensing unit. Which practice will increase recovery speed?
- 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?