Thermostatic expansion valve with electronic controller.

摘要

A refrigeration system employing a mechanical thermal expansion valve (30) with a self-heated thermistor (42) sensing saturation temperature at the high pressure inlet and a second thermistor sensing saturation temperature at the evaporator outlet. A microprocessor based controller (64) compares the sensed temperature with stored limits and provides output signals to a relay for cycling the condenser fan (24) responsive to high side pressure and the compressor clutch (14) responsive to the low pressure side temperature. For low pressure drop evaporators (34), the second thermistor (88) may be disposed at the evaporator inlet. <IMAGE>