of the three principal modes of operation which are shown in fig3 and 5 the ice storage tank 10 which contains ice freezing coils 11 made of metal tubing spaced on about 2 inch centers and connected by means of a top header 12 and bottom connections 13 which in turn are connected to a side port distributor 14 the distributor tubes 38 connecting the ice freezing coils 11 to the side port distributor 14 are of smaller diameters than the ice freezing coils 11 typically the ice freezing coils 11 are 3 16 inch diameter while the distributor tubes are typically 1 8 inch diameter these distributor tubes are brazed into the ice freezing coils 11 at each of the several circuits the actual number of circuits is determined by the size of the ice storage tank 10 the top header 12 is connected to the accumulator 15 by two lines 16 and 17 line 16 contains a check valve 25 which allows flow to occur upward into the top of the accumulator 15 while line 17 contains a check valve 40 which allows flow downward to header 12 thereby draining liquid and vapor from accumulator 15 when pressure inside the accumulator is greater than the pressure in the ice freezing coils 11 located in tank 10 34 j 34 tube 18 located in the accumulator 15 contains a small diameter hole 19 in its lower portion to allow oil to return to compressor 21 through suction line 20 during compressor operations the condensing unit 1 includes the compressor 21 and an outdoor coil 22 connected together by line 23 the liquid line 24 carries the condensed liquid to the remote evaporators that is either indoor evaporator coil.