Method and apparatus for detecting low refrigerant charge

Details Method and apparatus for detecting low refrigerant charge Method and apparatus for detecting low refrigerant charge

1991-09-26

1992-09-29

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

62126, 62227, F25B 100

Patent

active

051505843

ABSTRACT:
In an air conditioning system, thermistors measure evaporator inlet and outlet temperatures and compressor body temperature. When the differential between inlet and outlet temperatures is below a first threshold and the compressor temperature is above a second threshold, very low refrigerant charge is indicated and the compressor is turned off. Also, if compressor temperature reaches a critical value, the compressor is turned off regardless of the temperature differential across the evaporator.

REFERENCES:
patent: 4463576 (1984-08-01), Burnett et al.
patent: 4967567 (1990-11-01), Procter et al.
patent: 5009074 (1991-04-01), Goubeaux et al.

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