Type I — Small Appliances第 117 / 240 题
A technician evacuates a small appliance to 4 inches Hg vacuum and, after closing the valves, watches the pressure rise back toward zero. What does this rising pressure most likely indicate?
a.Refrigerant is still boiling out of the oil, so recovery should continue until the vacuum holds
b.The recovery is complete and the reading can be recorded
c.The appliance is a Type II unit
d.The vacuum pump is oversized
解析
A vacuum that rebounds after the valves are closed usually means refrigerant is still coming out of the oil and internal surfaces, so the system is not fully recovered. The technician should continue recovering until the vacuum holds at the required level. A stable 4 inches Hg vacuum is what confirms the small-appliance requirement is met.
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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