Universal two stage gas furnace ignition control apparatus and method
US6244515A · kind A · utility
9Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 8, 1999 |
| Grant date | Jun 12, 2001 |
| Priority date | — |
| Expiry date | Nov 8, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23N2237/10
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A gas furnace control for two stage gas furnaces which can be used with either a single stage or a two stage room thermostat monitors the length of time the first, low combustion, stage is energized and upon exceeding a selected period of time, e.g., 10 minutes, energizes the second, high combustion stage. Energization of the second stage signal (W2) also energizes the second stage without regard to timing of the first stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.