Method for proving furnace high-heat pressure switch

Details Method for proving furnace high-heat pressure switch Method for proving furnace high-heat pressure switch

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.

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