Thermostatic expansion valve with electronic controller

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

1990-01-31

1990-07-31

Wayner, William E.

Refrigeration

Automatic control

Of external fluid or means

62184, 62203, 62227, F25D 1700

Patent

active

049441604

ABSTRACT:
A refrigeration system employing a mechanical thermal expansion valve with a self-heated thermistor sensing saturation temperature at a high pressure inlet and a second thermistor sensing saturation temperature at the evaporator outlet. 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 and the compressor clutch responsive to the low pressure side temperature. For low pressure drop evaporators, the second thermistor may be disposed at the evaporator inlet.

REFERENCES:
patent: 4120173 (1978-10-01), Kimpel
patent: 4395886 (1983-08-01), Mayer
patent: 4474022 (1984-10-01), Puskar
patent: 4490987 (1985-01-01), Peterson
patent: 4614087 (1986-09-01), Nadamoto et al.
patent: 4790145 (1988-12-01), Thompson

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