Overcharge-undercharge diagnostic system for air conditioner controller
US5381669A · kind A · utility
129Cited by
16References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1993 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Jul 21, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25B2700/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The refrigeration control software periodically checks for overcharge and undercharge conditions by placing the expansion valve at a predetermined setting, based on measured environmental temperature. While the expansion valve is at the predetermined setting a series of compressor discharge temperature readings are taken to obtain an average reading and this average reading is compared with a reference value. An undercharge condition is declared when the average reading is greater than the reference value and an overcharged condition is declared when the average reading is less than the reference value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.