Type III — Low-PressureCâu 175 / 240
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
Giải thích
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.
Luyện miễn phí toàn bộ 240 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- The 25 mm Hg absolute recovery requirement for low-pressure appliances applies to:
- Approximately what inches-of-mercury vacuum reading corresponds to the 25 mm Hg absolute recovery level for low-pressure appliances?
- Non-condensable gases such as air that collect in a low-pressure chiller will:
- A technician wants to warm the refrigerant in a low-pressure chiller to speed recovery. Which method is acceptable?
- Low-pressure chillers most commonly use which type of compressor?
- If a low-pressure chiller's high-pressure limit control trips during operation, the technician should first:
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