Type III — Low-Pressure第 169 / 240 题
Frequent operation of the purge unit on a low-pressure chiller is usually a sign that:
a.The machine has a leak drawing air in
b.The refrigerant charge is too high
c.The condenser water is too cold
d.The compressor is overcharged with oil
解析
A rising purge rate means air is leaking into the vacuum side of the chiller, so the purge unit runs more often to remove it. The correct response is to find and repair the leak, not simply purge more. Modern high-efficiency purge units also track how much they run as a diagnostic.
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同考点相关题目
- Because a low-pressure chiller operates in a vacuum on the low side, what happens when it develops a leak?
- Water entering the refrigerant side of a low-pressure chiller through a leaking tube is dangerous mainly because it can:
- To speed up refrigerant recovery from a low-pressure chiller, a technician should:
- A low-pressure refrigerant is defined as one with a boiling point at atmospheric pressure that is:
- Which gas is safe to use, along with a trace of refrigerant, to raise pressure in a low-pressure appliance for leak detection?
- The 25 mm Hg absolute recovery requirement for low-pressure appliances applies to: