Indicating refrigerant liquid saturation point
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United States of America Patent
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-
Jun 27, 1989
Grant Date -
N/A
app pub date -
Nov 12, 1987
filing date -
Nov 12, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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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