Ignition control system for a gas appliance
US4695246A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1984 |
| Grant date | Sep 22, 1987 |
| Priority date | — |
| Expiry date | Aug 30, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23N2233/06
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
An ignition control system for a direct ignition gas appliance, such as a furnace. A main gas valve, spark generator, flame sensor, and purge blower are all interconnected to a single controller. The controller issues a purge signal to the blower for a first predetermined period. Thereafter, for a second predetermined period, the controller issues an interconnect signal to allow the main gas valve to open and an ignition signal to cause the ignition source to ignite the gas flowing into the appliance from the valve. If the controller thereafter fails to receive a signal from the flame sensor, the attempt at ignition was unsuccessful. After a predetermined number of unsuccessful attempts at ignition, the controller issues a lockout signal to the valve. Moreover, the controller includes redundant circuits for detecting malfunctions within itself and responsively closing the main gas valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.