Fuel-fired water heater with dual function combustion cutoff switch in its draft structure
US6766771B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 11, 2003 |
| Grant date | Jul 27, 2004 |
| Priority date | — |
| Expiry date | Sep 11, 2023 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24H1/205
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A fuel-fired power vented heating appliance, representatively a water heater, has, in its draft structure, a single thermal or other type of cutoff switch which serves the dual function of preventing (1) the creation of an unacceptably high level of carbon monoxide in the combustion chamber of the appliance, and (2) thermal damage to a PVC vent pipe portion of the draft structure. When triggered, the cutoff switch operates to terminate further firing of the appliance. In one illustrative embodiment of the appliance, this is achieved by preventing further combustion air flow to the appliance. In another illustrative embodiment of the appliance, it is achieved by terminating further fuel flow thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.