Automatic temperature and humidity regulation – Hot-air furnace
Patent
1983-09-06
1984-10-16
Bennett, Henry
Automatic temperature and humidity regulation
Hot-air furnace
237 55, 431 20, 165DIG2, F28F 110, F24B 700
Patent
active
044770197
ABSTRACT:
A flue gas heat recovery apparatus for a forced air type furnace of the type having a furnace heat exchanger, a return air duct and a heated air duct, and a blower for passing air from the return air duct over the furnace heat exchanger to the heated air duct. The heat recovery apparatus includes a secondary heat exchanger mounted in the return air duct having its inlet connected to the outlet of the furnace heat exchanger and an induced draft fan having its inlet connected to the outlet of the secondary heat exchanger and its outlet connected through an outlet flue pipe to the chimney. A vane is mounted in the outlet flue pipe in the path of flow from the induced draft fan and is moved between a closed position when the fan is not operating, to an open position when the fan is operating, and a switch is operated by the vane to operate the burner control after the induced draft is in operation.
REFERENCES:
patent: 2286296 (1942-06-01), McGrath
patent: 4103735 (1978-08-01), Warner
patent: 4111357 (1978-09-01), Mieczkowski
patent: 4176787 (1979-12-01), Gary
Bennett Henry
Pillote Vernon J.
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