Electrical system for controlling the operation of a heat exchan

Details Electrical system for controlling the operation of a heat exchan Electrical system for controlling the operation of a heat exchan

1990-12-12

1992-04-07

Wayner, William E.

Automatic temperature and humidity regulation

Motors

Electric

236 46R, F23N 520

Patent

active

051020424

ABSTRACT:
An electrical system for controlling the operation of a heat exchanger, control device therefor and methods of making the same are provided, the system comprising a first electrical transformer, a relay for causing the heat exchanger to be in one condition thereof when the relay is activated and for causing the heat exchanger to be in another condition thereof when the relay is deactivated, a switch for placing the relay across the secondary winding of the first transformer to activate the relay when the switch is in one condition thereof and to deactivate the relay when the switch is in another condition thereof, and a second transformer having a low voltage high current winding disposed in series with the switch when the switch is in one condition thereof so as to supply power to the low voltage high current winding and to increase the current flow from the secondary winding through the relay to activate the relay, the second transformer having only one other winding that is so arranged that power is supplied to the other winding when the switch is in the other condition thereof.

REFERENCES:
patent: 4091993 (1978-05-01), Knecht et al.
patent: 4249696 (1981-02-01), Donnelly et al.
patent: 4632303 (1986-12-01), Rodittis
Known to provide system having second transformer to operate relay. See FIG. 1 of application.
Known to use triac to operate relay and have only a two winding second transformer.

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