Heat pump conversion system for electric furnace

Heat exchange – Movable heating or cooling surface – Rotary drum

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Details

62160, 62324, F25B 2900

Patent

active

039931218

ABSTRACT:
A heat pump conversion system includes an electric furnace located within a building and having a first coil heat exchanger therein, an outside heat exchanger unit having a refrigerant compressor, a second coil heat exchanger and pipe and valve means for selectively connecting the first and second coil heat exchangers and the compressor for reversing the cycle of the heat pump to provide cooling and heating, and a thermostat disposed in a space to be heated within the building having a cooling switch for operating the heat pump in a cooling mode of operation, a first stage heating switch to operate the heat pump in a heating mode of operation when the temperature in the space drops below a set temperature, and a second stage heating switch for operating electrical heating elements in the electric furnace when the temperature in the space drops to a predetermined level below the set temperature. A protection circuit prevents operation of the compressor if the refrigerant temperature in the outside heat exchanger unit fails to reach a prescribed level within a predetermined time period after the first stage heating switch has closed.

REFERENCES:
patent: 2806674 (1957-09-01), Biehn
patent: 3004399 (1961-10-01), Keller
patent: 3060698 (1962-10-01), Felter
patent: 3111009 (1963-11-01), Maudlin
patent: 3132490 (1964-05-01), Schmidt
patent: 3365902 (1968-01-01), Nussbaum
patent: 3777508 (1973-12-01), Imabayashi et al.
patent: 3779031 (1973-12-01), Akiyama et al.

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