Process for controlling a heater, in particular a defrost heater for refrigerating plants
US4932217A · kind A · utility
Inventor
Key dates
| Filing date | Feb 10, 1989 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Feb 10, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/20
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In the case of a process for controlling a heater, in particular a defrost heater for a refrigerating plant which has a temperature sensor, which is connected to a system for cutting in and cutting out the heater, during the operation of the heater, the temperature of the room to be heated is measured at certain intervals of time, a measured temperature value being stored in each case and compared with the following measured value, whereupon the heater is cut out whenever the following measured value indicates a temperature which is higher by a certain amount than the preceding stored measured value, and the heater is cut in or remains cut in whenever the following measured value indicates a temperature which is lower by a certain amount than the preceding stored measured value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.