Hot surface ignition controller for fuel oil burner
US5567144A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 5, 1995 |
| Grant date | Oct 22, 1996 |
| Priority date | — |
| Expiry date | Oct 5, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23N2233/06
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A fuel oil burner utilizing a hot surface ignition with an ignitor that is fully sintered and has essentially no porosity, a circuit for applying AC line voltage to the ignitor and to a blower motor, an AC-to-DC converter for providing twelve volts DC for operation of a control circuit that has a first time constant circuit for preheating the ignitor and maintaining the ignitor at an ignition temperature for a predetermined ignition trial period of time, a second time constant circuit for starting the blower motor and providing fuel to the combustion chamber for a predetermined time concurrent with the ignition trial period, and a third time constant circuit that either maintains the fan blower in its energized state if a flame of sufficient magnitude and frequency is detected and for de-energizing the blower motor if the flame is not detected in less than one second after the ignitor is de-energized. A lock-out circuit is provided such that if no flame is detected, the unit cannot be restarred without first removing power and then reapplying power to the unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.