Spanish translation: circuito por cuartos de serpentín
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In fact,after speaking to the customer, I translated as "circuito por cuartos, por mitades, completo o doble", for this is what was happening: the refrigerant was flowing through the entire coil, but one quarter (or half) at a time. I am, of course, very thankful to my colleagues for taking the time to answer. 2 KudoZ points were awarded for this answer