Low refrigerant charge detection using a combined pressure/tempe

Details Low refrigerant charge detection using a combined pressure/tempe Low refrigerant charge detection using a combined pressure/tempe

1994-09-30

1996-12-24

Tanner, Harry B.

Refrigeration

With indicator or tester

Operatively correlated with automatic control

62129, F25B 4902

Patent

active

055864457

ABSTRACT:
Low refrigerant charge in a refrigeration system is detected by monitoring the compressor discharge pressure and temperature. This monitoring is accomplished with a combined pressure/temperature sensor located at or near the compressor outlet. The sensor output signals are fed to a controller which produces a low charge signal whenever a combination of high discharge temperature and a low discharge pressure is detected. The controller can optionally receive input of additional operating characteristics of the refrigeration system to provide a more accurate low charge signal. The controller is connected to an indicator and/or the compressor so that the low charge signal activates the indicator and/or deactivates the compressor.

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patent: 4651535 (1987-03-01), Alsenz
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patent: 5381669 (1995-01-01), Bahel et al.
patent: 5457965 (1995-10-01), Blair et al.

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