The purpose of the purge valve at the top of the condenser in a refrigerating system is to（）<br>A:remove any air that may accumulate in the system<br>B:take out unpleasant fumes from the refrigerant<br>C:vent off excess refrigerant in an emergency<br>D:permit opening the refrigerating system for cleaning and inspecting

The purpose of the purge valve at the top of the condenser in a refrigerating system is to（）
A:remove any air that may accumulate in the system
B:take out unpleasant fumes from the refrigerant
C:vent off excess refrigerant in an emergency
D:permit opening the refrigerating system for cleaning and inspecting

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