Thermostatic expansion valve with electronic controller

Details Thermostatic expansion valve with electronic controller Thermostatic expansion valve with electronic controller

1990-03-02

1991-02-19

Tanner, Harry B.

Refrigeration

Processes

Compressing, condensing and evaporating

62181, 62184, 622283.323.4, 62DIG17, 62129, F25B 3904, F25B 4902

Patent

active

049932314

ABSTRACT:
A refrigeration system employing a mechanical thermal expansion valve with a self-heated thermistor sensing saturation temperature at the high pressure inlet. A microprocessor based controller compares the sensed temperature with stored limits and provides output signals to a relay for cycling the condenser fan responsive to high side pressure means are provided for varying the current through the thermistor for operating same in the non-self heated mode to sense actual refrigeration temperature for generating a control signal to disable the compressor clutch when refrigerant temperature exceeds desired low limits.

REFERENCES:
patent: 4167858 (1979-09-01), Kojima et al.
patent: 4510763 (1984-04-01), Johnson
patent: 4835976 (1989-06-01), Torrence
patent: 4841734 (1989-06-01), Torrence
patent: 4944160 (1990-07-01), Malone et al.

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