Control for a combination furnace and heat pump system

Heat exchange – Regenerator – Checker brick structure

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Details

165 17, 165 29, F25B 1300

Patent

active

041789881

ABSTRACT:
A control circuit for a combination furnace and heat pump wherein a temperature dependent relay is connected to a thermostat such that the heat pump is operated to supply heat to an enclosure when the outdoor temperature is above a predetermined level and the furnace is operated to supply heat to the enclosure when the outdoor temperature is below a predetermined level. To defrost the outdoor coil of the heat pump the furnace is operated to supply heat to the indoor coil of the heat pump and a reversing valve relay is energized whereby the heat pump is operated in a reverse direction to supply heat to the outdoor coil for defrost.

REFERENCES:
patent: 2806674 (1957-09-01), Biehn
patent: 2847190 (1958-08-01), Slattery et al.
patent: 2902220 (1959-09-01), Myck et al.
patent: 3167114 (1965-01-01), Swart
patent: 3173476 (1965-03-01), McCready
patent: 3283809 (1966-11-01), Eberhart
patent: 3318372 (1967-05-01), Shell
patent: 3404729 (1968-10-01), De Armott et al.
patent: 3444923 (1969-05-01), Kyle et al.
patent: 3537509 (1970-11-01), Ferdelman
patent: 3556203 (1971-01-01), Kyle
patent: 3996998 (1976-12-01), Garst et al.

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