Method and apparatus for detecting low refrigerant charge
US5150584A · kind A · utility
64Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1991 |
| Grant date | Sep 29, 1992 |
| Priority date | — |
| Expiry date | Sep 26, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B2700/21175
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.