Method for controlling indoor coil freeze-up of heat pumps and air conditioners
US5065593A · kind A · utility
76Cited by
8References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1990 |
| Grant date | Nov 19, 1991 |
| Priority date | — |
| Expiry date | Sep 18, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25D2700/10
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A heat pump diagnostic and control system for controlling indoor coil freeze-up when in the cooling mode is provided. A low indoor coil temperature is sensed, the indoor fan speed is increased in steps up to a maximum to thaw the frost on the indoor coil. If this is not sufficient, the compressor speed is then reduced in steps until it is turned off and if necessary, it is held off until such time as the temperature sensor indicates thawing of the indoor coil of the heat exchanger. Diagnostic flow chart and control circuitry for accomplishing this control are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.