Abstract: A spiral-curved refrigerant coil set of a refrigerant condenser, especially a coil set which each coil winded of a streamlined cross-sectioned metal tube used in a non cooling-fin outdoor condenser apparatus for a separating air conditioning system. The purpose of using spiral-curved refrigerant coil is to save a plurality of U-turn connectors which eliminate a plurality of welding seams for U-turn connectors to promises no leakage thereat, and therefore reduce of the labor, and manufacturing costs. More particularly avoid the gradualness of “pressure drop” which occurs while the refrigerant passing through each U-turn connector due to friction so as to increase the E.E.R value therefore.