Type III — Low-Pressure第 175 / 240 题
Compared with older designs, a high-efficiency purge unit is desirable because it:
a.Purges air faster by venting more refrigerant
b.Releases very little refrigerant per pound of air purged
c.Eliminates the need for leak repair
d.Runs continuously to keep pressure high
解析
A high-efficiency purge unit recovers refrigerant vapor before releasing the non-condensable air, so it loses far less refrigerant per pound of air purged than older units. It reduces both refrigerant emissions and operating cost. It does not replace the need to find and repair the air leak causing frequent purging.
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