Method and apparatus for reducing thermal stress on heat exchang

Details Method and apparatus for reducing thermal stress on heat exchang Method and apparatus for reducing thermal stress on heat exchang

1991-10-30

1993-03-30

Sollecito, John

Automatic temperature and humidity regulation

Hot-air furnace

Air and fire control

236 94, 431 6, 431 18, 126116A, F23N 500

Patent

active

051976641

ABSTRACT:
The present invention is a furnace control system responsive to a circulator fan motor fault condition. Upon detection of the fault, the control determines a first time period which is required to activate the temperature limit switch of the furnace by continuous operation of the gas burner and a second time period which is required for the plenum to dissipate sufficient heat to deactivate the temperature limit switch. After determining the first and second time periods, the furnace control operates the burners for a fraction of the first time period and then allows the heat exchangers to cool for the second time period until the circulator fan motor fault is corrected or the demand for heat ceases.

REFERENCES:
patent: 4502625 (1985-03-01), Mueller
patent: 4706881 (1987-11-01), Ballard
patent: 4773586 (1988-09-01), Ryan
patent: 4792089 (1988-12-01), Ballard
patent: 4887767 (1989-12-01), Thompson et al.
patent: 4907737 (1990-03-01), Williams, Jr.
patent: 4982721 (1991-01-01), Lynch
patent: 5027789 (1991-07-01), Lynch

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