Refer to the air conditioning condensing unit drawing. The device indicated by the letter “E” has bubbles flowing in it constantly when the unit is running. The device at letter “D” is warm at the inlet and co nsiderably cooler at its outlet. The conditions described are an indication that the refrigeration system is ___.

Refer to the air conditioning condensing unit drawing. The device indicated by the letter “E” has bubbles flowing in it constantly when the unit is running. The device at letter “D” is warm at the inlet and co nsiderably cooler at its outlet. The conditions described are an indication that the refrigeration system is ___.