Automatic temperature and humidity regulation – Hot-air furnace
Patent
1994-10-12
1996-06-04
Wayner, William E.
Automatic temperature and humidity regulation
Hot-air furnace
126116A, 236 15C, 431 19, F23N 100
Patent
active
055225411
ABSTRACT:
In a two-stage furnace system, including a thermostat, at least one gas burner with a low and high-fire operating capability, an inducer fan having low and high speed operating settings, and a high-fire pressure switch, a method for handling the high-fire pressure switch being in an inappropriately open condition. The method has the steps of: determining whether the thermostat is issuing a call for high heat and, if it is, determining if the high-fire pressure switch is open. If the high-fire pressure switch is open, waiting a predetermined time, determining if the high-fire pressure switch is still open and, if it is, completing a furnace shutdown procedure, then initiating a normal shutdown, then an ignition sequence in high-speed inducer pre-purge mode, determining if the high-fire pressure switch remains open, and if so, running at least one gas burner in low-fire mode. If, while these steps are being performed, the high-fire pressure switch closes, running the system in high-fire mode.
REFERENCES:
patent: 4887767 (1989-12-01), Thompson et al.
patent: 4976459 (1990-12-01), Lynch
patent: 4982721 (1991-01-01), Lynch
patent: 5027789 (1991-07-01), Lynch
patent: 5186386 (1993-02-01), Lynch
patent: 5379752 (1995-01-01), Virgil, Jr. et al.
Dempsey Daniel J.
Virgil, Jr. Hall
Zia Ninev K.
Carrier Corporation
Wayner William E.
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