Control apparatus

Details Control apparatus Control apparatus

1987-10-02

1989-04-04

Wayner, William E.

Automatic temperature and humidity regulation

Hot-air furnace

236 46R, F23N 520

Patent

active

048178624

ABSTRACT:
Control apparatus for controlling the operation of a gas valve in a gas heating system which includes thermostatic switch means and a source of AC voltage which are connected to form a series circuit with the gas valve is disclosed. The control apparatus comprises switch means which is connected to provide continuity in the series circuit upon receipt of a first control signal and to remove the continuity in the series circuit upon removal of the first control signal. Isolation means receives a second control signal having a high state and an alternate low state and generates the first control signal when receiving the high state of the second control signal. A power supply receives the AC voltage when the thermostatic switch means is closed and provides a DC voltage to a timer means. The timer means then generates the second control signal.

REFERENCES:
patent: 3940634 (1976-02-01), Grogan
patent: 4176288 (1979-11-01), Komatsu et al.
patent: 4384461 (1983-05-01), Kurtz
patent: 4485966 (1984-12-01), Cartmell et al.
patent: 4509585 (1985-04-01), Carney et al.
patent: 4667874 (1987-05-01), Johnson et al.
patent: 4694890 (1987-09-01), Zarate

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