Refrigeration – Processes – Compressing – condensing and evaporating
Patent
1987-11-12
1989-06-27
Wayner, William E.
Refrigeration
Processes
Compressing, condensing and evaporating
62181, 622283, 374 27, F25D 1700
Patent
active
048417343
ABSTRACT:
A refrigerant control system employing a "self-heated" thermistor disposed in the high pressure refrigerant line to sense refrigerant temperature from the condenser as it enters the expansion valve or capillary. The voltage drop is detected across a resistor in series with the thermistor and converted to saturation pressure from known refrigerant properties. A microprocessor de-energizes the compressor and turns on the condenser fan when excessive saturation pressure is detected. An optional second thermistor senses actual refrigerant temperature for comparison with the saturation temperature to determine sub-cooling and the microprocessor disables the compressor in the event of excessive or insufficient sub-cooling.
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Eaton Corporation
Johnston R. A.
Wayner William E.
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