are located in opposing portions 97 and 98 of the melt cooler in a side by side configuration the normal operating mode by which the hot melt polymer is directed by the diverter valve 92 through the melt cooler 90 is shown in the left hand illustration of fig9 marked u201c a u201d the bypass mode is shown in the center illustration of fig9 marked u201c b u201d and the drain mode is shown in the right hand illustration marked u201c c u201d in each mode of operation the diverter valve 92 operates in the same manner as described above for diverter valves 40 and 62 and therefore the description of the operation is not repeated here as shown in fig1 and 11 respectively melt cooler 30 and melt cooler 60 can be configured to vent compressible fluids and to drain the polymeric melt and other fluids fig1 illustrates a vent 95 located on the top 38 of melt cooler 30 fig1 illustrates a vent and drain 101 located on the bottom 100 of melt cooler 60 to provide for the desired melt flow regimes in the top 38 of melt cooler 30 the top 38 can be heated for example as illustrated in fig1 the top 38 can be heated or cooled by a thermal transfer fluid that passes through flow channel 39 in another possible heating configuration as illustrated in fig1 the.