Type II — High-Pressure第 137 / 240 题
A technician plans to retrofit an old R-22 system to an HFC blend that uses polyolester (POE) oil. Which statement about the retrofit is correct?
a.Mineral oil works with all HFC blends, so no oil change is needed
b.The R-22 must be recovered, and the mineral oil is typically replaced with the POE oil the new refrigerant requires
c.Retrofitting removes the need for any leak repair
d.The remaining R-22 can be vented since the system is being changed
解析
In a retrofit, the existing R-22 must be recovered, never vented, and because most HFC blends are not compatible with mineral oil, the oil is usually changed to polyolester (POE). Components like the filter-drier are commonly replaced and the metering device may need adjustment. Venting during a retrofit is prohibited under Section 608.
法律依据: 40 CFR §82.154免费刷完整 240 道题库 — 无需注册。
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