Refrigeration systems including evaporator with 2 speed fan motor

Claim 1

An improved refrigeration system having conduit connected compressor, condenser (46), restrictor (62), and evaporator (66); first motor (36) connected to the compressor for driving it, said first motor having energized and deenergized conditions; a fan (68A), positioned to blow air over the evaporator (66); a second motor (70A) connected to said fan for driving it, said second motor adapted to operate at higher voltage-higher speed, lower voltage-lower speed; first conductor means (82) connected to said second motor for supplying electric power to it; wherein the improvement comprises; second conductor means (97) adapted for connection to a higher voltage power supply (2B3); third impedance-free conductor means (95) adapted for connection to a lower voltage power supply (N1); switch means (92, 94, 96) connected to first conductor means (82), second conductor means (97) and third conductor means (95), adapted to provide electrical contact between said first conductor means (82) and alternately second conductor means (97) and third conductor means (95), said switch means (92, 94, 96) being operatively connected to establish essential correspondence between a. the energized condition of the first motor (36) and the electrical contact between the first conductor means (82) and the second conductor means (97) to cause the second motor to operate at higher speed, and b. the deenergized condition of the first motor (36) and electrical contact between the first conductor means (82) and the third conductor means (95) to cause the second motor to operate at lower speed.