Control for electric water heater
US6242720A · kind A · utility
28Cited by
14References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1998 |
| Grant date | Jun 5, 2001 |
| Priority date | — |
| Expiry date | Dec 23, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24D2240/26
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A control for a water heater having upper and lower heating elements assures that the upper heating element is not activated until certain control conditions are met. The control first determines whether the temperature sensed by a sensor in the vicinity of the upper heating element has reached a predefined set point temperature for that sensor. The control thereafter determines whether the temperature sensed by the sensor declines at a rate greater or equal to a threshold rate of temperature change before authorizing any activation of the upper heating element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.