Type II — High-Pressure第 147 / 240 题
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.10 inches Hg vacuum
b.15 inches Hg vacuum
c.4 inches Hg vacuum
d.0 inches Hg
解析
Because the unit holds less than 200 pounds and the recovery equipment is post-1993, the required recovery evacuation level is 10 inches Hg vacuum. Units holding 200 pounds or more require 15 inches Hg with post-1993 equipment. The 0 and 4 inches Hg figures apply only to pre-1993 recovery equipment.
法律依据: 40 CFR §82.156免费刷完整 240 道题库 — 无需注册。
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